Try to fix the bug of null pointer

Author: gefeili

pg/src/main/java/org/bouncycastle/openpgp/PGPEncryptedDataGenerator.java

@@ -265,11 +265,11 @@ private OutputStream open(
                 // data is encrypted by AEAD Encrypted Data packet (rfc4880bis10), so write v5 SKESK packet
                 if (isV5StyleAEAD)
                 {
-                    writeOpenPGPv5ESKPacket(method, sessionInfo);
+                    writeOpenPGPv5ESKPacket(method, sessionKey);
                 }
                 else // data is encrypted by v2 SEIPD (AEAD), so write v6 SKESK packet
                 {
-                    writeOpenPGPv6ESKPacket(method, aeadDataEncryptor.getAEADAlgorithm(), sessionInfo);
+                    writeOpenPGPv6ESKPacket(method, aeadDataEncryptor.getAEADAlgorithm(), sessionKey);
                 }
             }
             // OpenPGP v4

pg/src/main/java/org/bouncycastle/openpgp/operator/PBEKeyEncryptionMethodGenerator.java

@@ -179,7 +179,7 @@ public ContainedPacket generateV6(int kekAlgorithm, int aeadAlgorithm, byte[] se
 
     // If we use this method, roundtripping v5 AEAD is broken.
     //  TODO: Investigate
-    private ContainedPacket generateV5ESK(int kekAlgorithm, int aeadAlgorithm, byte[] sessionInfo)
+    private ContainedPacket generateV5ESK(int kekAlgorithm, int aeadAlgorithm, byte[] sessionKey)
         throws PGPException
     {
         byte[] ikm = getKey(kekAlgorithm);
@@ -194,15 +194,14 @@ private ContainedPacket generateV5ESK(int kekAlgorithm, int aeadAlgorithm, byte[
         random.nextBytes(iv);
 
         int tagLen = AEADUtils.getAuthTagLength(aeadAlgorithm);
-        byte[] sessionKey = getSessionKey(sessionInfo);
         byte[] eskAndTag = getEskAndTag(kekAlgorithm, aeadAlgorithm, sessionKey, ikm, iv, info);
         byte[] esk = Arrays.copyOfRange(eskAndTag, 0, eskAndTag.length - tagLen);
         byte[] tag = Arrays.copyOfRange(eskAndTag, esk.length, eskAndTag.length);
 
         return SymmetricKeyEncSessionPacket.createV5Packet(kekAlgorithm, aeadAlgorithm, iv, s2k, esk, tag);
     }
 
-    private ContainedPacket generateV6ESK(int kekAlgorithm, int aeadAlgorithm, byte[] sessionInfo)
+    private ContainedPacket generateV6ESK(int kekAlgorithm, int aeadAlgorithm, byte[] sessionKey)
         throws PGPException
     {
         byte[] ikm = getKey(kekAlgorithm);
@@ -218,7 +217,6 @@ private ContainedPacket generateV6ESK(int kekAlgorithm, int aeadAlgorithm, byte[
         random.nextBytes(iv);
 
         int tagLen = AEADUtils.getAuthTagLength(aeadAlgorithm);
-        byte[] sessionKey = getSessionKey(sessionInfo);
         byte[] eskAndTag = getEskAndTag(kekAlgorithm, aeadAlgorithm, sessionKey, kek, iv, info);
         byte[] esk = Arrays.copyOfRange(eskAndTag, 0, eskAndTag.length - tagLen);
         byte[] tag = Arrays.copyOfRange(eskAndTag, esk.length, eskAndTag.length);