use same Randomizer instance

Author: mus65

src/Renci.SshNet/Abstractions/CryptoAbstraction.cs

@@ -7,7 +7,7 @@ namespace Renci.SshNet.Abstractions
 {
     internal static class CryptoAbstraction
     {
-        private static readonly RandomNumberGenerator Randomizer = RandomNumberGenerator.Create();
+        internal static readonly RandomNumberGenerator Randomizer = RandomNumberGenerator.Create();
 
         internal static readonly SecureRandom SecureRandom = new SecureRandom(new CryptoApiRandomGenerator(Randomizer));
     }

src/Renci.SshNet/Abstractions/RandomNumberGeneratorExtensions.cs

@@ -1,19 +1,19 @@
 #nullable enable
+#if !NET
+using Renci.SshNet.Abstractions;
+#endif
+
 namespace System.Security.Cryptography
 {
     internal static class RandomNumberGeneratorExtensions
     {
-#if !NET
-        private static readonly RandomNumberGenerator Randomizer = RandomNumberGenerator.Create();
-#endif
-
         extension(RandomNumberGenerator)
         {
 #if !NET
             public static byte[] GetBytes(int length)
             {
                 var random = new byte[length];
-                Randomizer.GetBytes(random);
+                CryptoAbstraction.Randomizer.GetBytes(random);
                 return random;
             }
 #endif