PR icsharpcode#577 Make ZipAESStream throw ZipException instead of Ex…

…ception when the AES auth code is wrong

src/ICSharpCode.SharpZipLib/Encryption/ZipAESStream.cs

@@ -1,4 +1,6 @@
 using ICSharpCode.SharpZipLib.Core;
+using ICSharpCode.SharpZipLib.Zip;
+
 using System;
 using System.IO;
 using System.Security.Cryptography;
@@ -137,14 +139,14 @@ private int ReadAndTransform(byte[] buffer, int offset, int count)
 						nBytes += TransformAndBufferBlock(buffer, offset, bytesLeftToRead, finalBlock);
 					}
 					else if (byteCount < AUTH_CODE_LENGTH)
-						throw new Exception("Internal error missed auth code"); // Coding bug
+						throw new ZipException("Internal error missed auth code"); // Coding bug
 																				// Final block done. Check Auth code.
 					byte[] calcAuthCode = _transform.GetAuthCode();
 					for (int i = 0; i < AUTH_CODE_LENGTH; i++)
 					{
 						if (calcAuthCode[i] != _slideBuffer[_slideBufStartPos + i])
 						{
-							throw new Exception("AES Authentication Code does not match. This is a super-CRC check on the data in the file after compression and encryption. \r\n"
+							throw new ZipException("AES Authentication Code does not match. This is a super-CRC check on the data in the file after compression and encryption. \r\n"
 								+ "The file may be damaged.");
 						}
 					}