3 files changed, 23 insertions, 14 deletions
diff --git a/crypto/src/crypto/engines/AsconEngine.cs b/crypto/src/crypto/engines/AsconEngine.cs
index aff8499dc..870d0e57f 100644
--- a/crypto/src/crypto/engines/AsconEngine.cs
+++ b/crypto/src/crypto/engines/AsconEngine.cs
@@ -614,7 +614,7 @@ namespace Org.BouncyCastle.Crypto.Engines
             case State.EncFinal:
                 throw new InvalidOperationException(AlgorithmName + " cannot be reused for encryption");
             default:
-                throw new InvalidOperationException();
+                throw new InvalidOperationException(AlgorithmName + " needs to be initialized");
             }
         }
 
@@ -637,7 +637,7 @@ namespace Org.BouncyCastle.Crypto.Engines
             case State.EncFinal:
                 throw new InvalidOperationException(AlgorithmName + " cannot be reused for encryption");
             default:
-                throw new InvalidOperationException();
+                throw new InvalidOperationException(AlgorithmName + " needs to be initialized");
             }
         }
 
@@ -1027,7 +1027,7 @@ namespace Org.BouncyCastle.Crypto.Engines
                 m_state = State.EncFinal;
                 return;
             default:
-                throw new InvalidOperationException();
+                throw new InvalidOperationException(AlgorithmName + " needs to be initialized");
             }
 
             ascon_aeadinit();
diff --git a/crypto/src/crypto/modes/ChaCha20Poly1305.cs b/crypto/src/crypto/modes/ChaCha20Poly1305.cs
index 6330d2348..dc56f4184 100644
--- a/crypto/src/crypto/modes/ChaCha20Poly1305.cs
+++ b/crypto/src/crypto/modes/ChaCha20Poly1305.cs
@@ -708,9 +708,9 @@ namespace Org.BouncyCastle.Crypto.Modes
             case State.EncAad:
                 break;
             case State.EncFinal:
-                throw new InvalidOperationException("ChaCha20Poly1305 cannot be reused for encryption");
+                throw new InvalidOperationException(AlgorithmName + " cannot be reused for encryption");
             default:
-                throw new InvalidOperationException();
+                throw new InvalidOperationException(AlgorithmName + " needs to be initialized");
             }
         }
 
@@ -730,9 +730,9 @@ namespace Org.BouncyCastle.Crypto.Modes
             case State.EncData:
                 break;
             case State.EncFinal:
-                throw new InvalidOperationException("ChaCha20Poly1305 cannot be reused for encryption");
+                throw new InvalidOperationException(AlgorithmName + " cannot be reused for encryption");
             default:
-                throw new InvalidOperationException();
+                throw new InvalidOperationException(AlgorithmName + " needs to be initialized");
             }
         }
 
@@ -886,7 +886,7 @@ namespace Org.BouncyCastle.Crypto.Modes
                 this.mState = State.EncFinal;
                 return;
             default:
-                throw new InvalidOperationException();
+                throw new InvalidOperationException(AlgorithmName + " needs to be initialized");
             }
 
             if (resetCipher)
@@ -898,7 +898,11 @@ namespace Org.BouncyCastle.Crypto.Modes
 
             if (null != mInitialAad)
             {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+                ProcessAadBytes(mInitialAad);
+#else
                 ProcessAadBytes(mInitialAad, 0, mInitialAad.Length);
+#endif
             }
         }
     }
diff --git a/crypto/src/crypto/modes/GCMBlockCipher.cs b/crypto/src/crypto/modes/GCMBlockCipher.cs
index 05bb7fc21..92e4de4a9 100644
--- a/crypto/src/crypto/modes/GCMBlockCipher.cs
+++ b/crypto/src/crypto/modes/GCMBlockCipher.cs
@@ -234,7 +234,11 @@ namespace Org.BouncyCastle.Crypto.Modes
 
             if (initialAssociatedText != null)
             {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+                ProcessAadBytes(initialAssociatedText);
+#else
                 ProcessAadBytes(initialAssociatedText, 0, initialAssociatedText.Length);
+#endif
             }
         }
 
@@ -916,12 +920,13 @@ namespace Org.BouncyCastle.Crypto.Modes
             {
                 initialised = false;
             }
-            else
+            else if (initialAssociatedText != null)
             {
-                if (initialAssociatedText != null)
-                {
-                    ProcessAadBytes(initialAssociatedText, 0, initialAssociatedText.Length);
-                }
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+                ProcessAadBytes(initialAssociatedText);
+#else
+                ProcessAadBytes(initialAssociatedText, 0, initialAssociatedText.Length);
+#endif
             }
         }
 
@@ -1728,7 +1733,7 @@ namespace Org.BouncyCastle.Crypto.Modes
                 if (forEncryption)
                     throw new InvalidOperationException("GCM cipher cannot be reused for encryption");
 
-                throw new InvalidOperationException("GCM cipher needs to be initialised");
+                throw new InvalidOperationException("GCM cipher needs to be initialized");
             }
         }
     }