diff --git a/xml/System.Security.Cryptography/RSA.xml b/xml/System.Security.Cryptography/RSA.xml
index da6fbec6720..cca30d9db9d 100644
--- a/xml/System.Security.Cryptography/RSA.xml
+++ b/xml/System.Security.Cryptography/RSA.xml
@@ -40,11 +40,8 @@
       <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- Extending this class proves that you are implementing an `RSA` key. This is required for any developer providing a new `RSA` key implementation.  
   
- The only purpose of this class is as a hierarchy member for identification of the `RSA` algorithm.  
-  
- The <xref:System.Security.Cryptography.RSACryptoServiceProvider> supports key lengths from 384 bits to 16384 bits in increments of 8 bits if you have the Microsoft Enhanced Cryptographic Provider installed.  It supports key lengths from 384 bits to 512 bits in increments of 8 bits if you have the Microsoft Base Cryptographic Provider installed.  
+Developers are encouraged to program against the `RSA` base class rather than any specific derived class. The derived classes are intended for interop with the underlying system cryptographic libraries.
   
  ]]></format>
     </remarks>
@@ -185,7 +182,7 @@
         <returns>A new ephemeral RSA key with the specified key size.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.Security.Cryptography.CryptographicException">
-          <paramref name="keySizeInBits" /> is different than <see cref="P:System.Security.Cryptography.AsymmetricAlgorithm.KeySize" />.</exception>
+          <paramref name="keySizeInBits" /> is not supported by the default implementation.</exception>
       </Docs>
     </Member>
     <Member MemberName="Create">
@@ -220,6 +217,8 @@
         <summary>Creates a new ephemeral RSA key with the specified RSA key parameters.</summary>
         <returns>A new ephemeral RSA key.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="parameters" /> does not represent a valid RSA key.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.ImportParameters(System.Security.Cryptography.RSAParameters)" />
       </Docs>
     </Member>
     <Member MemberName="Create">
@@ -309,7 +308,22 @@
         <summary>When overridden in a derived class, decrypts the input data using the specified padding mode.</summary>
         <returns>The decrypted data.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="data"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
         <exception cref="T:System.NotImplementedException">A derived class must override this method.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+The length of <paramref name="data"/> is not equal to the number of bytes for <see cref="P:System.Security.Cryptography.AsymmetricAlgorithm.KeySize"/>.
+
+-or-
+
+This instance represents only a public key. 
+
+-or-
+
+The decryption operation failed.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TryDecrypt(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.RSAEncryptionPadding,System.Int32@)" />
       </Docs>
     </Member>
     <Member MemberName="DecryptValue">
@@ -360,6 +374,7 @@
  ]]></format>
         </remarks>
         <exception cref="T:System.NotSupportedException">This method call is not supported. This exception is thrown starting with the [!INCLUDE[net_v46](~/includes/net-v46-md.md)].</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.Decrypt(System.Byte[],System.Security.Cryptography.RSAEncryptionPadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -406,7 +421,18 @@
         <summary>When overridden in a derived class, encrypts the input data using the specified padding mode.</summary>
         <returns>The encrypted data.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="data"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
         <exception cref="T:System.NotImplementedException">A derived class must override this method.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+The length of <paramref name="data"/> is too long for the combination of <see cref="P:System.Security.Cryptography.AsymmetricAlgorithm.KeySize"/> and the selected padding.
+
+-or-
+
+The encryption operation failed.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TryEncrypt(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.RSAEncryptionPadding,System.Int32@)"/>
       </Docs>
     </Member>
     <Member MemberName="EncryptValue">
@@ -457,6 +483,7 @@
  ]]></format>
         </remarks>
         <exception cref="T:System.NotSupportedException">This method call is not supported. This exception is thrown starting with the [!INCLUDE[net_v46](~/includes/net-v46-md.md)].</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.Encrypt(System.Byte[],System.Security.Cryptography.RSAEncryptionPadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -500,6 +527,7 @@
         <summary>When overridden in a derived class, exports the <see cref="T:System.Security.Cryptography.RSAParameters" />.</summary>
         <returns>The parameters for <see cref="T:System.Security.Cryptography.RSA" />.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.Security.Cryptography.CryptographicException">The parameters could not be exported.</exception>
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -1208,7 +1236,7 @@ The algorithm-specific key import failed.
         <Parameter Name="padding" Type="System.Security.Cryptography.RSASignaturePadding" Index="2" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1;xamarinandroid-7.1;xamarinios-10.8;xamarinmac-3.0" />
       </Parameters>
       <Docs>
-        <param name="data">The input data for which to compute the hash.</param>
+        <param name="data">The input data to hash and sign.</param>
         <param name="hashAlgorithm">The hash algorithm to use to create the hash value.</param>
         <param name="padding">The padding mode.</param>
         <summary>Computes the hash value of the specified byte array using the specified hash algorithm and padding mode, and signs the resulting hash value.</summary>
@@ -1222,6 +1250,17 @@ The algorithm-specific key import failed.
  <paramref name="padding" /> is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentException">
           <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+This instance represents only a public key.
+
+-or-
+
+An error occurred creating the signature.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TrySignData(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding,System.Int32@)" />
+        <altmember cref="M:System.Security.Cryptography.RSA.SignHash(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
       </Docs>
     </Member>
     <Member MemberName="SignData">
@@ -1259,7 +1298,7 @@ The algorithm-specific key import failed.
         <Parameter Name="padding" Type="System.Security.Cryptography.RSASignaturePadding" Index="2" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1;xamarinandroid-7.1;xamarinios-10.8;xamarinmac-3.0" />
       </Parameters>
       <Docs>
-        <param name="data">The input stream for which to compute the hash.</param>
+        <param name="data">The input stream to hash and sign.</param>
         <param name="hashAlgorithm">The hash algorithm to use to create the hash value.</param>
         <param name="padding">The padding mode.</param>
         <summary>Computes the hash value of the specified stream using the specified hash algorithm and padding mode, and signs the resulting hash value.</summary>
@@ -1273,6 +1312,17 @@ The algorithm-specific key import failed.
  <paramref name="padding" /> is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentException">
           <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+This instance represents only a public key.
+
+-or-
+
+An error occurred creating the signature.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TrySignData(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding,System.Int32@)" />
+        <altmember cref="M:System.Security.Cryptography.RSA.SignHash(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
       </Docs>
     </Member>
     <Member MemberName="SignData">
@@ -1312,7 +1362,7 @@ The algorithm-specific key import failed.
         <Parameter Name="padding" Type="System.Security.Cryptography.RSASignaturePadding" Index="4" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1;xamarinandroid-7.1;xamarinios-10.8;xamarinmac-3.0" />
       </Parameters>
       <Docs>
-        <param name="data">The input data for which to compute the hash.</param>
+        <param name="data">The input data to hash and sign.</param>
         <param name="offset">The offset into the array at which to begin using data.</param>
         <param name="count">The number of bytes in the array to use as data.</param>
         <param name="hashAlgorithm">The hash algorithm to use to create the hash value.</param>
@@ -1338,6 +1388,17 @@ The algorithm-specific key import failed.
  -or-  
   
  <paramref name="offset" /> + <paramref name="count" /> - 1 results in an index that is beyond the upper bound of <paramref name="data" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+This instance represents only a public key.
+
+-or-
+
+An error occurred creating the signature.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TrySignData(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding,System.Int32@)" />
+        <altmember cref="M:System.Security.Cryptography.RSA.SignHash(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
       </Docs>
     </Member>
     <Member MemberName="SignHash">
@@ -1382,10 +1443,24 @@ The algorithm-specific key import failed.
         <param name="hash">The hash value of the data to be signed.</param>
         <param name="hashAlgorithm">The hash algorithm used to create the hash value of the data.</param>
         <param name="padding">The padding.</param>
-        <summary>When overridden in a derived class, computes the signature for the specified hash value by encrypting it with the private key using the specified padding.</summary>
+        <summary>When overridden in a derived class, computes the signature for the specified hash value using the specified padding.</summary>
         <returns>The RSA signature for the specified hash value.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.NotImplementedException">A derived class must override this method.</exception>
+        <exception cref="T:System.ArgumentNullException"><paramref name="data"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.ArgumentException">
+          <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+This instance represents only a public key.
+
+-or-
+
+An error occurred creating the signature.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TrySignHash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding,System.Int32@)" />
+        <altmember cref="M:System.Security.Cryptography.RSA.SignData(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
       </Docs>
     </Member>
     <Member MemberName="ToXmlString">
@@ -1495,13 +1570,39 @@ The algorithm-specific key import failed.
         <Parameter Name="bytesWritten" Type="System.Int32" RefType="out" Index="3" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="destination">To be added.</param>
-        <param name="padding">To be added.</param>
-        <param name="bytesWritten">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="data">The data to decrypt.</param>
+        <param name="destination">The buffer to receive the decrypted data.</param>
+        <param name="padding">The padding mode.</param>
+        <param name="bytesWritten">When this method returns, the total number of bytes written into <paramref name="destination"/>. This parameter is treated as uninitialized.</param>
+        <summary>Attempts to decrypt the input data using the specified padding mode, writing the result into a provided buffer.</summary>
+        <returns>
+          <see langword="true"/> if <paramref name="destination"/> is long enough to receive the decrypted data; otherwise, <see langword="false"/>.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+The default implementation of this method calls <xref:System.Security.Cryptography.RSA.Decrypt(System.Byte[],System.Security.Cryptography.RSAEncryptionPadding)> and copies the result to `destination`.
+Derived types should override this method to avoid the intermediate array creation.
+
+The RSA decryption algorithm will always produce an output smaller than the input, therefore this method will never return `false` when `destination.Length >= data.Length`.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+The length of <paramref name="data"/> is not equal to the number of bytes for <see cref="P:System.Security.Cryptography.AsymmetricAlgorithm.KeySize"/>.
+
+-or-
+
+This instance represents only a public key. 
+
+-or-
+
+The decryption operation failed.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.Decrypt(System.Byte[],System.Security.Cryptography.RSAEncryptionPadding)" />
       </Docs>
     </Member>
     <Member MemberName="TryEncrypt">
@@ -1533,13 +1634,35 @@ The algorithm-specific key import failed.
         <Parameter Name="bytesWritten" Type="System.Int32" RefType="out" Index="3" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="destination">To be added.</param>
-        <param name="padding">To be added.</param>
-        <param name="bytesWritten">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="data">The data to encrypt.</param>
+        <param name="destination">The buffer to receive the encrypted data.</param>
+        <param name="padding">The padding mode.</param>
+        <param name="bytesWritten">When this method returns, the total number of bytes written into <paramref name="destination"/>. This parameter is treated as uninitialized.</param>
+        <summary>Attempts to encrypt the input data with a specified padding mode into a provided buffer.</summary>
+        <returns>
+          <see langword="true"/> if <paramref name="destination"/> is long enough to receive the encrypted data; otherwise, <see langword="false"/>.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+The default implementation of this method calls <xref:System.Security.Cryptography.RSA.Encrypt(System.Byte[],System.Security.Cryptography.RSAEncryptionPadding)> and copies the result to `destination`.
+Derived types should override this method to avoid the intermediate array creation.
+
+The RSA encryption algorithm will always produce an output equal to the number of bytes required for <xref:System.Security.Cryptography.AsymmetricAlgorithm.KeySize> bits.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+The length of <paramref name="data"/> is too long for the combination of <see cref="P:System.Security.Cryptography.AsymmetricAlgorithm.KeySize"/> and the selected padding.
+
+-or-
+
+The encryption operation failed.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.Encrypt(System.Byte[],System.Security.Cryptography.RSAEncryptionPadding)"/>
       </Docs>
     </Member>
     <Member MemberName="TryExportEncryptedPkcs8PrivateKey">
@@ -1815,13 +1938,22 @@ The algorithm-specific key import failed.
         <Parameter Name="bytesWritten" Type="System.Int32" RefType="out" Index="3" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="destination">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <param name="bytesWritten">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="data">The data to be hashed.</param>
+        <param name="destination">The buffer to receive the hash value.</param>
+        <param name="hashAlgorithm">The algorithm to use in hash the data.</param>
+        <param name="bytesWritten">When this method returns, the total number of bytes written into <paramref name="destination"/>. This parameter is treated as uninitialized.</param>
+        <summary>Attempts to compute the hash of the provided data by using the specified algorithm, writing the results into a provided buffer.</summary>
+        <returns>
+          <see langword="true"/> if <paramref name="destination"/> is long enough to receive the hash value; otherwise, <see langword="false"/>.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+The default implementation of this method calls <xref:System.Security.Cryptography.RSA.HashData(System.Byte[],System.Int32,System.Int32,System.Security.Cryptography.HashAlgorithmName)> and copies the result to `destination`.
+Derived types should override this method to avoid the intermediate array creation.
+
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="TrySignData">
@@ -1854,14 +1986,32 @@ The algorithm-specific key import failed.
         <Parameter Name="bytesWritten" Type="System.Int32" RefType="out" Index="4" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="destination">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <param name="padding">To be added.</param>
-        <param name="bytesWritten">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="data">The input data to hash and sign.</param>
+        <param name="destination">The buffer to receive the RSA signature.</param>
+        <param name="hashAlgorithm">The hash algorithm used to create the hash value of the data.</param>
+        <param name="padding">The padding mode.</param>
+        <param name="bytesWritten">When this method returns, the total number of bytes written into <paramref name="destination"/>. This parameter is treated as uninitialized.</param>
+        <summary>Attempts to hash the provided data with the specified algorithm and sign the hash with the current key, writing the signature into a provided buffer.</summary>
+        <returns>
+          <see langword="true"/> if <paramref name="destination"/> is long enough to receive the RSA signature; otherwise, <see langword="false"/>.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+The RSA signature algorithm will always produce an output equal to the number of bytes required for <xref:System.Security.Cryptography.AsymmetricAlgorithm.KeySize> bits.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="padding" /> is <see langword="null" />.</exception>
+        <exception cref="T:System.ArgumentException">
+          <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException">This instance represents only a public key.
+
+-or-
+
+An error occurred creating the signature.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.SignData(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
+        <altmember cref="M:System.Security.Cryptography.RSA.TrySignHash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding,System.Int32@)" />
       </Docs>
     </Member>
     <Member MemberName="TrySignHash">
@@ -1894,14 +2044,39 @@ The algorithm-specific key import failed.
         <Parameter Name="bytesWritten" Type="System.Int32" RefType="out" Index="4" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="hash">To be added.</param>
+        <param name="hash">The hash value of the data to be signed.</param>
         <param name="destination">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <param name="padding">To be added.</param>
-        <param name="bytesWritten">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="hashAlgorithm">The hash algorithm used to create the hash value of the data.</param>
+        <param name="padding">The padding.</param>
+        <param name="bytesWritten">When this method returns, the total number of bytes written into <paramref name="destination"/>. This parameter is treated as uninitialized.</param>
+        <summary>Attempts to sign the hash with the current key, writing the signature into a provided buffer.</summary>
+        <returns>
+          <see langword="true"/> if <paramref name="destination"/> is long enough to receive the RSA signature; otherwise, <see langword="false"/>.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+The default implementation of this method calls <xref:System.Security.Cryptography.RSA.SignHash(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)> and copies the result to `destination`.
+Derived types should override this method to avoid the intermediate array creation.
+
+The RSA signature algorithm will always produce an output equal to the number of bytes required for <xref:System.Security.Cryptography.AsymmetricAlgorithm.KeySize> bits.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.ArgumentException">
+          <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+This instance represents only a public key.
+
+-or-
+
+An error occurred creating the signature.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.SignHash(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
+        <altmember cref="M:System.Security.Cryptography.RSA.TrySignData(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding,System.Int32@)" />
       </Docs>
     </Member>
     <MemberGroup MemberName="VerifyData">
@@ -1972,6 +2147,7 @@ The algorithm-specific key import failed.
  <paramref name="padding" /> is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentException">
           <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.</exception>
       </Docs>
     </Member>
     <Member MemberName="VerifyData">
@@ -2030,6 +2206,7 @@ The algorithm-specific key import failed.
  <paramref name="padding" /> is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentException">
           <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.</exception>
       </Docs>
     </Member>
     <Member MemberName="VerifyData">
@@ -2061,13 +2238,17 @@ The algorithm-specific key import failed.
         <Parameter Name="padding" Type="System.Security.Cryptography.RSASignaturePadding" Index="3" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="signature">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <param name="padding">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The signed data.</param>
+        <param name="signature">The signature data to be verified.</param>
+        <param name="hashAlgorithm">The hash algorithm used to create the hash value of the data.</param>
+        <param name="padding">The padding mode.</param>
+        <summary>Verifies that a digital signature is valid by calculating the hash value of the specified data using the specified hash algorithm and padding, and comparing it to the provided signature.</summary>
+        <returns>
+          <see langword="true" /> if the signature is valid; otherwise, <see langword="false" />.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentException">
+          <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.</exception>
       </Docs>
     </Member>
     <Member MemberName="VerifyData">
@@ -2140,6 +2321,7 @@ The algorithm-specific key import failed.
  -or-  
   
  <paramref name="offset" /> + <paramref name="count" /> - 1 results in an index that is beyond the upper bound of <paramref name="data" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.</exception>
       </Docs>
     </Member>
     <Member MemberName="VerifyHash">
@@ -2191,6 +2373,10 @@ The algorithm-specific key import failed.
           <see langword="true" /> if the signature is valid; otherwise, <see langword="false" />.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.NotImplementedException">A derived class must override this method.</exception>
+        <exception cref="T:System.ArgumentNullException"><paramref name="hash"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.ArgumentException">
+          <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.</exception>
       </Docs>
     </Member>
     <Member MemberName="VerifyHash">
@@ -2222,13 +2408,26 @@ The algorithm-specific key import failed.
         <Parameter Name="padding" Type="System.Security.Cryptography.RSASignaturePadding" Index="3" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="hash">To be added.</param>
-        <param name="signature">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <param name="padding">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="hash">The hash value of the signed data.</param>
+        <param name="signature">The signature data to be verified.</param>
+        <param name="hashAlgorithm">The hash algorithm used to create the hash value.</param>
+        <param name="padding">The padding mode.</param>
+        <summary>Verifies that a digital signature is valid by determining the hash value in the signature using the specified hash algorithm and padding, and comparing it to the provided hash value.</summary>
+        <returns>
+          <see langword="true" /> if the signature is valid; otherwise, <see langword="false" />.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+The default implementation of this method is to copy `hash` and `signature` to new arrays and call <xref:System.Security.Cryptography.RSA.VerifyHash(System.Byte[],System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)>.
+Derived types should override this method to avoid the intermediate array creation.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="hash"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.ArgumentException">
+          <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.</exception>
       </Docs>
     </Member>
   </Members>
diff --git a/xml/System.Security.Cryptography/RSACng.xml b/xml/System.Security.Cryptography/RSACng.xml
index 2bee62cc62d..b1fcf0c1c85 100644
--- a/xml/System.Security.Cryptography/RSACng.xml
+++ b/xml/System.Security.Cryptography/RSACng.xml
@@ -82,7 +82,17 @@
       <Parameters />
       <Docs>
         <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSACng" /> class with a random 2,048-bit key pair.</summary>
-        <remarks>To be added.</remarks>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+
+This constructor does not generate a new public/private keypair immediately.
+This constructor sets the <xref:System.Security.Cryptography.AsymmetricAlgorithm.KeySize> property to 2048 and when a key is needed one is generated using the property value.
+If a key is loaded via the <xref:System.Security.Cryptography.RSACng.ImportParameters%2A> method, or other key import method, the key size from this constructor has no meaning.
+  
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName=".ctor">
@@ -119,7 +129,11 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- Valid key sizes range from 384 to 16,384 bits, in increments of 8. We recommend that a minimum size of 2,048 bits be used for all keys.  
+Valid key sizes range from 384 to 16,384 bits, in increments of 8. We recommend that a minimum size of 2,048 bits be used for all keys.  
+  
+This constructor does not generate a new public/private keypair immediately.
+This constructor sets the <xref:System.Security.Cryptography.AsymmetricAlgorithm.KeySize> property to `keySize` and when a key is needed one is generated using the property value.
+If a key is loaded via the <xref:System.Security.Cryptography.RSACng.ImportParameters%2A> method, or other key import method, the key size from this constructor has no meaning.
   
  ]]></format>
         </remarks>
@@ -288,8 +302,9 @@
         <Parameter Name="disposing" Type="System.Boolean" Index="0" FrameworkAlternate="dotnet-plat-ext-2.1;dotnet-plat-ext-2.2;dotnet-plat-ext-3.0;netcore-1.0;netcore-1.1;netcore-3.0;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8" />
       </Parameters>
       <Docs>
-        <param name="disposing">To be added.</param>
-        <summary>To be added.</summary>
+        <param name="disposing">
+          <see langword="true" /> to release both managed and unmanaged resources; <see langword="false" /> to release only unmanaged resources.</param>
+        <summary>Releases the unmanaged resources used by the <see cref="T:System.Security.Cryptography.RSACng" /> and optionally releases the managed resources.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -447,10 +462,10 @@
         <Parameter Name="hashAlgorithm" Type="System.Security.Cryptography.HashAlgorithmName" Index="1" FrameworkAlternate="dotnet-plat-ext-2.1;dotnet-plat-ext-2.2;dotnet-plat-ext-3.0;netcore-1.0;netcore-1.1;netcore-3.0;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The binary stream to hash.</param>
+        <param name="hashAlgorithm">The hash algorithm.</param>
+        <summary>Computes the hash value of a specified binary stream by using a specified hashing algorithm.</summary>
+        <returns>The hashed data.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -487,12 +502,12 @@
         <Parameter Name="hashAlgorithm" Type="System.Security.Cryptography.HashAlgorithmName" Index="3" FrameworkAlternate="dotnet-plat-ext-2.1;dotnet-plat-ext-2.2;dotnet-plat-ext-3.0;netcore-1.0;netcore-1.1;netcore-3.0;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="offset">To be added.</param>
-        <param name="count">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The data to be hashed.</param>
+        <param name="offset">The index of the first byte in <paramref name="data" /> that is to be hashed.</param>
+        <param name="count">The number of bytes to hash.</param>
+        <param name="hashAlgorithm">The algorithm to use in hash the data.</param>
+        <summary>Computes the hash value of a specified portion of a byte array by using a specified hashing algorithm.</summary>
+        <returns>The hashed data.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -538,7 +553,10 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- If `parameters` contains only an exponent and modulus, only a public key is imported. If `parameters` also contains P and Q values, a full key pair is imported.  
+If `parameters` contains only an exponent and modulus, only a public key is imported. If `parameters` also contains P and Q values, a full key pair is imported.  
+
+This method builds a new ephemeral RSA key object using the specified parameters and replaces the <xref:System.Security.Cryptography.RSACng.Key> value with the new key,
+any already open key is unaffected by this method.
   
  ]]></format>
         </remarks>
@@ -646,8 +664,8 @@
         <ReturnType>System.Security.Cryptography.KeySizes[]</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the key sizes, in bits, that are supported by this implementation of RSA.</summary>
+        <value>An array that contains the key sizes supported by the algorithm.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Security.Cryptography/RSACryptoServiceProvider.xml b/xml/System.Security.Cryptography/RSACryptoServiceProvider.xml
index aa363f78a4d..e30ff560e74 100644
--- a/xml/System.Security.Cryptography/RSACryptoServiceProvider.xml
+++ b/xml/System.Security.Cryptography/RSACryptoServiceProvider.xml
@@ -117,16 +117,17 @@
       </Attributes>
       <Parameters />
       <Docs>
-        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSACryptoServiceProvider" /> class using the default key.</summary>
+        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSACryptoServiceProvider" /> class with a random key pair.</summary>
         <remarks>
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- If no default key is found, a new key is created.  
   
- This constructor creates an <xref:System.Security.Cryptography.KeyNumber.Exchange> key pair suitable to encrypt session keys so that they can be safely stored and exchanged with other users.  The generated key corresponds to a key generated using the `AT_KEYEXCHANGE` value used in the unmanaged Microsoft Cryptographic API (CAPI).  
+This constructor creates an <xref:System.Security.Cryptography.KeyNumber.Exchange> key pair suitable to encrypt session keys so that they can be safely stored and exchanged with other users.  The generated key corresponds to a key generated using the `AT_KEYEXCHANGE` value used in the unmanaged Microsoft Cryptographic API (CAPI).  
   
-   
+This constructor does not generate a new public/private keypair immediately.
+If no key is loaded via the <xref:System.Security.Cryptography.RSACryptoServiceProvider.ImportParameters%2A> method, or any other key import method, before a key is needed then a 1024-bit ephemeral key is created on demand.
+
   
 ## Examples  
  The following code example uses the <xref:System.Security.Cryptography.RSACryptoServiceProvider> class to encrypt a string into an array of bytes and then decrypt the bytes back into a string.  
@@ -177,15 +178,16 @@
       </Parameters>
       <Docs>
         <param name="dwKeySize">The size of the key to use in bits.</param>
-        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSACryptoServiceProvider" /> class with the specified key size.</summary>
+        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSACryptoServiceProvider" /> class with a random key pair of the specified key size.</summary>
         <remarks>
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- If no default key is found, a new key is created.  
-  
- This constructor creates an <xref:System.Security.Cryptography.KeyNumber.Exchange> key pair suitable to encrypt session keys so that they can be safely stored and exchanged with other users.  The generated key corresponds to a key generated using the `AT_KEYEXCHANGE` value used in the unmanaged Microsoft Cryptographic API (CAPI).  
+
+This constructor creates an <xref:System.Security.Cryptography.KeyNumber.Exchange> key pair suitable to encrypt session keys so that they can be safely stored and exchanged with other users.  The generated key corresponds to a key generated using the `AT_KEYEXCHANGE` value used in the unmanaged Microsoft Cryptographic API (CAPI).  
   
+This constructor does not generate a new public/private keypair immediately.
+If no key is loaded via the <xref:System.Security.Cryptography.RSACryptoServiceProvider.ImportParameters%2A> method, or any other key import method, before a key is needed then a `dwKeySize`-bit ephemeral key is created on demand.
    
   
 ## Examples  
@@ -455,7 +457,7 @@
       <Docs>
         <param name="rgb">The data to be decrypted.</param>
         <param name="fOAEP">
-          <see langword="true" /> to perform direct <see cref="T:System.Security.Cryptography.RSA" /> decryption using OAEP padding (only available on a computer running Microsoft Windows XP or later); otherwise, <see langword="false" /> to use PKCS#1 v1.5 padding.</param>
+          <see langword="true" /> to perform direct <see cref="T:System.Security.Cryptography.RSA" /> decryption using OAEP padding; otherwise, <see langword="false" /> to use PKCS#1 v1.5 padding.</param>
         <summary>Decrypts data with the <see cref="T:System.Security.Cryptography.RSA" /> algorithm.</summary>
         <returns>The decrypted data, which is the original plain text before encryption.</returns>
         <remarks>
@@ -485,13 +487,10 @@
   
  -or-  
   
- The <paramref name="fOAEP" /> parameter is <see langword="true" /> and OAEP is not supported.  
-  
- -or-  
-  
  The key does not match the encrypted data. However, the exception wording may not be accurate. For example, it may say <c>Not enough storage is available to process this command</c>.</exception>
         <exception cref="T:System.ArgumentNullException">
           <paramref name="rgb" /> is <see langword="null" />.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSACryptoServiceProvider.Decrypt(System.Byte[],System.Security.Cryptography.RSAEncryptionPadding)" />
         <permission cref="T:System.Security.Permissions.KeyContainerPermissionAccessEntryCollection">for permission to decrypt. Security action: <see cref="F:System.Security.Permissions.SecurityAction.Demand" />. Associated enumeration: <see cref="F:System.Security.Permissions.KeyContainerPermissionFlags.Decrypt" /></permission>
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
@@ -694,11 +693,10 @@
 ## Remarks  
  The following table describes the padding supported by different versions of Microsoft Windows and the maximum length of `rgb` allowed by the different combinations of operating systems and padding.  
   
-|Padding|Operating System Supported|Maximum Length of rgb Parameter|  
-|-------------|--------------------------------|-------------------------------------|  
-|OAEP padding (PKCS#1 v2)|Windows XP or later.|Modulus size -2 -2*hLen, where hLen is the size of the hash.|  
-|Direct Encryption (PKCS#1 v1.5)|Microsoft Windows 2000 or later with the high encryption pack installed.|Modulus size - 11. (11 bytes is the minimum padding possible.)|  
-|Direct Encryption and OAEP padding not supported|Microsoft Windows 98, Windows Millennium Edition, or Windows 2000 or later without the high encryption pack installed.|The maximum size allowed for a symmetric key.|  
+|Padding|Maximum Length of rgb Parameter|  
+|-------------|-------------------------------------|  
+|OAEP padding (PKCS#1 v2)|Modulus size -2 -2*hLen, where hLen is the size of the hash.|  
+|Direct Encryption (PKCS#1 v1.5)|Modulus size - 11. (11 bytes is the minimum padding possible.)|  
   
  Use <xref:System.Security.Cryptography.RSACryptoServiceProvider.Decrypt%2A> to decrypt the results of this method.  
   
@@ -717,13 +715,10 @@
   
  -or-  
   
- The length of the <paramref name="rgb" /> parameter is greater than the maximum allowed length.  
-  
- -or-  
-  
- The <paramref name="fOAEP" /> parameter is <see langword="true" /> and OAEP padding is not supported.</exception>
+ The length of the <paramref name="rgb" /> parameter is greater than the maximum allowed length.</exception>
         <exception cref="T:System.ArgumentNullException">
           <paramref name="rgb" /> is <see langword="null" />.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSACryptoServiceProvider.Encrypt(System.Byte[],System.Security.Cryptography.RSAEncryptionPadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -963,7 +958,7 @@
       </ReturnValue>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
+        <summary>Releases the unmanaged resources held by this instance.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -1004,10 +999,10 @@
         <Parameter Name="hashAlgorithm" Type="System.Security.Cryptography.HashAlgorithmName" Index="1" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;xamarinandroid-7.1;xamarinios-10.8;xamarinmac-3.0" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The binary stream to hash.</param>
+        <param name="hashAlgorithm">The hash algorithm.</param>
+        <summary>Computes the hash value of a specified binary stream by using a specified hashing algorithm.</summary>
+        <returns>The hashed data.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -1050,12 +1045,12 @@
         <Parameter Name="hashAlgorithm" Type="System.Security.Cryptography.HashAlgorithmName" Index="3" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;xamarinandroid-7.1;xamarinios-10.8;xamarinmac-3.0" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="offset">To be added.</param>
-        <param name="count">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The data to be hashed.</param>
+        <param name="offset">The index of the first byte in <paramref name="data" /> that is to be hashed.</param>
+        <param name="count">The number of bytes to hash.</param>
+        <param name="hashAlgorithm">The algorithm to use in hash the data.</param>
+        <summary>Computes the hash value of a specified portion of a byte array by using a specified hashing algorithm.</summary>
+        <returns>The hashed data.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -1522,7 +1517,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         <Parameter Name="halg" Type="System.Object" />
       </Parameters>
       <Docs>
-        <param name="buffer">The input data for which to compute the hash.</param>
+        <param name="data">The input data to hash and sign.</param>
         <param name="halg">The hash algorithm to use to create the hash value.</param>
         <summary>Computes the hash value of the specified byte array using the specified hash algorithm, and signs the resulting hash value.</summary>
         <returns>The <see cref="T:System.Security.Cryptography.RSA" /> signature for the specified data.</returns>
@@ -1547,6 +1542,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         </remarks>
         <exception cref="T:System.ArgumentNullException">The <paramref name="halg" /> parameter is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentException">The <paramref name="halg" /> parameter is not a valid type.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.SignData(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -1590,7 +1586,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         <Parameter Name="halg" Type="System.Object" />
       </Parameters>
       <Docs>
-        <param name="inputStream">The input data for which to compute the hash.</param>
+        <param name="inputStream">The input stream to hash and sign.</param>
         <param name="halg">The hash algorithm to use to create the hash value.</param>
         <summary>Computes the hash value of the specified input stream using the specified hash algorithm, and signs the resulting hash value.</summary>
         <returns>The <see cref="T:System.Security.Cryptography.RSA" /> signature for the specified data.</returns>
@@ -1613,6 +1609,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         </remarks>
         <exception cref="T:System.ArgumentNullException">The <paramref name="halg" /> parameter is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentException">The <paramref name="halg" /> parameter is not a valid type.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.SignData(System.IO.Stream,System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -1658,7 +1655,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         <Parameter Name="halg" Type="System.Object" />
       </Parameters>
       <Docs>
-        <param name="buffer">The input data for which to compute the hash.</param>
+        <param name="buffer">The input data to hash and sign.</param>
         <param name="offset">The offset into the array from which to begin using data.</param>
         <param name="count">The number of bytes in the array to use as data.</param>
         <param name="halg">The hash algorithm to use to create the hash value.</param>
@@ -1691,6 +1688,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         </remarks>
         <exception cref="T:System.ArgumentNullException">The <paramref name="halg" /> parameter is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentException">The <paramref name="halg" /> parameter is not a valid type.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.SignData(System.Byte[],System.Int32,System.Int32,System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -1701,7 +1699,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         <AssemblyVersion>4.1.0.0</AssemblyVersion>
       </AssemblyInfo>
       <Docs>
-        <summary>Computes the signature for the specified hash value by encrypting it with the private key.</summary>
+        <summary>Computes the signature for the specified hash value.</summary>
       </Docs>
     </MemberGroup>
     <Member MemberName="SignHash">
@@ -1746,7 +1744,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
       <Docs>
         <param name="rgbHash">The hash value of the data to be signed.</param>
         <param name="str">The hash algorithm identifier (OID) used to create the hash value of the data.</param>
-        <summary>Computes the signature for the specified hash value by encrypting it with the private key.</summary>
+        <summary>Computes the signature for the specified hash value.</summary>
         <returns>The <see cref="T:System.Security.Cryptography.RSA" /> signature for the specified hash value.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[  
@@ -1774,6 +1772,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
   
  There is no private key.</exception>
         <permission cref="T:System.Security.Permissions.KeyContainerPermissionAccessEntryCollection">for permission to sign a file using the key. Security action: <see cref="F:System.Security.Permissions.SecurityAction.Demand" />. Associated enumeration: <see cref="F:System.Security.Permissions.KeyContainerPermissionFlags.Sign" /></permission>
+        <altmember cref="M:System.Security.Cryptography.RSACryptoServiceProvider.SignHash(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -1813,7 +1812,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         <param name="hash">The hash value of the data to be signed.</param>
         <param name="hashAlgorithm">The hash algorithm name used to create the hash value of the data.</param>
         <param name="padding">The padding.</param>
-        <summary>Computes the signature for the specified hash value by encrypting it with the private key using the specified padding.</summary>
+        <summary>Computes the signature for the specified hash value using the specified padding.</summary>
         <returns>The <see cref="T:System.Security.Cryptography.RSA" /> signature for the specified hash value.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.ArgumentException">
@@ -1959,6 +1958,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
         </remarks>
         <exception cref="T:System.ArgumentNullException">The <paramref name="halg" /> parameter is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentException">The <paramref name="halg" /> parameter is not a valid type.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.VerifyData(System.Byte[],System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -2048,6 +2048,7 @@ The supported RSA key sizes depend on the available cryptographic service provid
  -or-  
   
  The signature cannot be verified.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSACryptoServiceProvider.VerifyHash(System.Byte[],System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
         <related type="Article" href="~/docs/standard/security/cryptographic-services.md">Cryptographic Services</related>
       </Docs>
     </Member>
diff --git a/xml/System.Security.Cryptography/RSAOpenSsl.xml b/xml/System.Security.Cryptography/RSAOpenSsl.xml
index 2f961faa900..8359cf2aa23 100644
--- a/xml/System.Security.Cryptography/RSAOpenSsl.xml
+++ b/xml/System.Security.Cryptography/RSAOpenSsl.xml
@@ -17,7 +17,7 @@
   </Base>
   <Interfaces />
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Provides an implementation of the RSA algorithm backed by OpenSSL.</summary>
     <remarks>
       <format type="text/markdown"><![CDATA[  
   
@@ -45,8 +45,18 @@
       </AssemblyInfo>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
-        <remarks>To be added.</remarks>
+        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSAOpenSsl" /> class with a random 2048-bit key pair.</summary>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+
+This constructor does not generate a new public/private keypair immediately.
+This constructor sets the <xref:System.Security.Cryptography.RSAOpenSsl.KeySize> property to 2048 and when a key is needed one is generated using the property value.
+If a key is loaded via the <xref:System.Security.Cryptography.RSAOpenSsl.ImportParameters%2A> method, or other key import method, the key size from this constructor has no meaning.
+  
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName=".ctor">
@@ -68,9 +78,21 @@
         <Parameter Name="keySize" Type="System.Int32" />
       </Parameters>
       <Docs>
-        <param name="keySize">To be added.</param>
-        <summary>To be added.</summary>
+        <param name="keySize">The size of the key to generate in bits.</param>
+        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSAOpenSsl" /> class with a randomly generated key of the specified size.</summary>
         <remarks>To be added.</remarks>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+This constructor does not generate a new public/private keypair immediately.
+This constructor sets the <xref:System.Security.Cryptography.RSAOpenSsl.KeySize> property to `keySize` and when a key is needed one is generated using the property value.
+If a key is loaded via the <xref:System.Security.Cryptography.RSAOpenSsl.ImportParameters%2A> method, or other key import method, the key size from this constructor has no meaning.
+  
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.Security.Cryptography.CryptographicException">
+          <paramref name="keySize" /> is not valid.</exception>
       </Docs>
     </Member>
     <Member MemberName=".ctor">
@@ -92,9 +114,22 @@
         <Parameter Name="handle" Type="System.IntPtr" />
       </Parameters>
       <Docs>
-        <param name="handle">To be added.</param>
-        <summary>To be added.</summary>
-        <remarks>To be added.</remarks>
+        <param name="handle">The OpenSSL <c>RSA*</c> value to use as the key.</param>
+        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSAOpenSsl" /> class from an existing OpenSSL key represented as an <c>RSA*</c>.</summary>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+
+> [!IMPORTANT]
+> OpenSSL supports multiple library versions being loaded within the same process.
+> Before calling this constructor, verify your pointer value came from the same version of OpenSSL that this class uses. 
+> For more information, see <xref:System.Security.Cryptography.SafeEvpPKeyHandle.OpenSslVersion>.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.Security.Cryptography.CryptographicException">
+          <paramref name="handle" /> is not a valid <c>RSA*</c>.</exception>
       </Docs>
     </Member>
     <Member MemberName=".ctor">
@@ -116,9 +151,18 @@
         <Parameter Name="parameters" Type="System.Security.Cryptography.RSAParameters" />
       </Parameters>
       <Docs>
-        <param name="parameters">To be added.</param>
-        <summary>To be added.</summary>
-        <remarks>To be added.</remarks>
+        <param name="parameters">The parameters for the key.</param>
+        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSAOpenSsl" /> class using specified key parameters.</summary>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+This constructor is equivalent to using the default constructor and calling <xref:System.Security.Cryptography.RSAOpenSsl.ImportParameters%2A>.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.Security.Cryptography.CryptographicException">
+          <paramref name="parameters" /> is not a valid RSA key.</exception>
       </Docs>
     </Member>
     <Member MemberName=".ctor">
@@ -140,9 +184,22 @@
         <Parameter Name="pkeyHandle" Type="System.Security.Cryptography.SafeEvpPKeyHandle" />
       </Parameters>
       <Docs>
-        <param name="pkeyHandle">To be added.</param>
-        <summary>To be added.</summary>
-        <remarks>To be added.</remarks>
+        <param name="pkeyHandle">The OpenSSL <c>EVP_PKEY*</c> value to use as the key, represented as a <see cref="T:System.Security.Cryptography.SafeEvpPKeyHandle" />.</param>
+        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.RSAOpenSsl" /> class from an existing OpenSSL key represented as an <c>EVP_PKEY*</c>.</summary>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+
+> [!IMPORTANT]
+> OpenSSL supports multiple library versions being loaded within the same process.
+> Before calling this constructor, verify your pointer value came from the same version of OpenSSL that this class uses.
+> For more information, see <xref:System.Security.Cryptography.SafeEvpPKeyHandle.OpenSslVersion>.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.Security.Cryptography.CryptographicException">
+          <paramref name="pkeyHandle" /> does not represent an RSA key.</exception>
       </Docs>
     </Member>
     <Member MemberName="Decrypt">
@@ -168,11 +225,26 @@
         <Parameter Name="padding" Type="System.Security.Cryptography.RSAEncryptionPadding" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="padding">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The data to decrypt.</param>
+        <param name="padding">The padding mode.</param>
+        <summary>Decrypts the input data using the specified padding mode.</summary>
+        <returns>The decrypted data.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="data"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+The length of <paramref name="data"/> is not equal to the number of bytes for <see cref="P:System.Security.Cryptography.AsymmetricAlgorithm.KeySize"/>.
+
+-or-
+
+This instance represents only a public key. 
+
+-or-
+
+The decryption operation failed.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TryDecrypt(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.RSAEncryptionPadding,System.Int32@)" />
       </Docs>
     </Member>
     <Member MemberName="Dispose">
@@ -197,8 +269,9 @@
         <Parameter Name="disposing" Type="System.Boolean" />
       </Parameters>
       <Docs>
-        <param name="disposing">To be added.</param>
-        <summary>To be added.</summary>
+        <param name="disposing">
+          <see langword="true" /> to release both managed and unmanaged resources; <see langword="false" /> to release only unmanaged resources.</param>
+        <summary>Releases the unmanaged resources used by the <see cref="T:System.Security.Cryptography.RSAOpenSsl" /> and optionally releases the managed resources.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -222,9 +295,18 @@
       </ReturnValue>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <summary>Gets a <see cref="T:System.Security.Cryptography.SafeEvpPKeyHandle"/> representation of the cryptographic key.</summary>
+        <returns>A <see cref="T:System.Security.Cryptography.SafeEvpPKeyHandle"/> representation of the cryptographic key.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+
+Each call to this method produces a new <xref:System.Security.Cryptography.SafeEvpPKeyHandle> object with its own lifetime.
+The objects returned by this method can safely be used even after this <xref:System.Security.Cryptography.RSAOpenSsl> instance has been disposed.
+
+]]></format>
+        </remarks> 
       </Docs>
     </Member>
     <Member MemberName="Encrypt">
@@ -250,11 +332,22 @@
         <Parameter Name="padding" Type="System.Security.Cryptography.RSAEncryptionPadding" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="padding">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The data to encrypt.</param>
+        <param name="padding">The padding mode.</param>
+        <summary>Encrypts the input data using the specified padding mode.</summary>
+        <returns>The encrypted data.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="data"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+The length of <paramref name="data"/> is too long for the combination of <see cref="P:System.Security.Cryptography.AsymmetricAlgorithm.KeySize"/> and the selected padding.
+
+-or-
+
+The encryption operation failed.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TryEncrypt(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.RSAEncryptionPadding,System.Int32@)"/>
       </Docs>
     </Member>
     <Member MemberName="ExportParameters">
@@ -279,10 +372,12 @@
         <Parameter Name="includePrivateParameters" Type="System.Boolean" />
       </Parameters>
       <Docs>
-        <param name="includePrivateParameters">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="includePrivateParameters">
+          <see langword="true" /> to include private parameters; otherwise, <see langword="false" />.</param>
+        <summary>Exports the <see cref="T:System.Security.Cryptography.RSAParameters" />.</summary>
+        <returns>The parameters for <see cref="T:System.Security.Cryptography.RSA" />.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.Security.Cryptography.CryptographicException">The parameters could not be exported.</exception>
       </Docs>
     </Member>
     <Member MemberName="HashData">
@@ -308,10 +403,10 @@
         <Parameter Name="hashAlgorithm" Type="System.Security.Cryptography.HashAlgorithmName" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The binary stream to hash.</param>
+        <param name="hashAlgorithm">The hash algorithm.</param>
+        <summary>Computes the hash value of a specified binary stream by using a specified hashing algorithm.</summary>
+        <returns>The hashed data.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -340,12 +435,12 @@
         <Parameter Name="hashAlgorithm" Type="System.Security.Cryptography.HashAlgorithmName" />
       </Parameters>
       <Docs>
-        <param name="data">To be added.</param>
-        <param name="offset">To be added.</param>
-        <param name="count">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="data">The data to be hashed.</param>
+        <param name="offset">The index of the first byte in <paramref name="data" /> that is to be hashed.</param>
+        <param name="count">The number of bytes to hash.</param>
+        <param name="hashAlgorithm">The algorithm to use in hash the data.</param>
+        <summary>Computes the hash value of a specified portion of a byte array by using a specified hashing algorithm.</summary>
+        <returns>The hashed data.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -371,9 +466,11 @@
         <Parameter Name="parameters" Type="System.Security.Cryptography.RSAParameters" />
       </Parameters>
       <Docs>
-        <param name="parameters">To be added.</param>
-        <summary>To be added.</summary>
+        <param name="parameters">The parameters for <see cref="T:System.Security.Cryptography.RSA" />.</param>
+        <summary>Imports the specified <see cref="T:System.Security.Cryptography.RSAParameters" />.</summary>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.Security.Cryptography.CryptographicException">
+          <paramref name="parameters" /> is not a valid RSA key.</exception>
       </Docs>
     </Member>
     <Member MemberName="KeySize">
@@ -395,9 +492,20 @@
         <ReturnType>System.Int32</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
+        <summary>Gets or sets the size, in bits, of the key modulus used by the asymmetric algorithm.</summary>
+        <value>The size, in bits, of the key modulus used by the asymmetric algorithm.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+
+Setting this property to its current value has no visible effect.
+Setting this property to a new legal value discards the current key, but defers creation of a new key until one is needed.
+
+]]></format>
+        </remarks> 
+        <exception cref="T:System.Security.Cryptography.CryptographicException">
+          <paramref name="value" /> is not permitted by <see cref="P:System.Security.Cryptography.RSAOpenSsl.LegalKeySizes" />.</exception>
       </Docs>
     </Member>
     <Member MemberName="LegalKeySizes">
@@ -419,8 +527,8 @@
         <ReturnType>System.Security.Cryptography.KeySizes[]</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the key sizes, in bits, that are supported by this implementation of RSA.</summary>
+        <value>An array that contains the key sizes supported by the algorithm.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -448,12 +556,26 @@
         <Parameter Name="padding" Type="System.Security.Cryptography.RSASignaturePadding" />
       </Parameters>
       <Docs>
-        <param name="hash">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <param name="padding">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="hash">The hash value of the data to be signed.</param>
+        <param name="hashAlgorithm">The hash algorithm used to create the hash value of the data.</param>
+        <param name="padding">The padding.</param>
+        <summary>Computes the signature for the specified hash value using the specified padding.</summary>
+        <returns>The RSA signature for the specified hash value.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="data"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.ArgumentException">
+          <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.
+
+-or-
+
+This instance represents only a public key.
+
+-or-
+
+An error occurred creating the signature.</exception>
+        <altmember cref="M:System.Security.Cryptography.RSA.TrySignHash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding,System.Int32@)" />
+        <altmember cref="M:System.Security.Cryptography.RSA.SignData(System.Byte[],System.Security.Cryptography.HashAlgorithmName,System.Security.Cryptography.RSASignaturePadding)" />
       </Docs>
     </Member>
     <Member MemberName="VerifyHash">
@@ -481,13 +603,18 @@
         <Parameter Name="padding" Type="System.Security.Cryptography.RSASignaturePadding" />
       </Parameters>
       <Docs>
-        <param name="hash">To be added.</param>
-        <param name="signature">To be added.</param>
-        <param name="hashAlgorithm">To be added.</param>
-        <param name="padding">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="hash">The hash value of the signed data.</param>
+        <param name="signature">The signature data to be verified.</param>
+        <param name="hashAlgorithm">The hash algorithm used to create the hash value.</param>
+        <param name="padding">The padding mode.</param>
+        <summary>Verifies that a digital signature is valid by determining the hash value in the signature using the specified hash algorithm and padding, and comparing it to the provided hash value.</summary>
+        <returns>
+          <see langword="true" /> if the signature is valid; otherwise, <see langword="false" />.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="hash"/> or <paramref name="padding"/> is <see langword="null"/>.</exception>
+        <exception cref="T:System.ArgumentException">
+          <paramref name="hashAlgorithm" />.<see cref="P:System.Security.Cryptography.HashAlgorithmName.Name" /> is <see langword="null" /> or <see cref="F:System.String.Empty" />.</exception>
+        <exception cref="T:System.Security.Cryptography.CryptographicException"><paramref name="padding"/> is unknown, or not supported by this implementation.</exception>
       </Docs>
     </Member>
   </Members>