Do not check CRC in case of AE-2 as CRC is 0 according to the specification.

Author: Remo Gloor

src/ICSharpCode.SharpZipLib/Zip/ZipEntry.cs

@@ -982,6 +982,19 @@ public int AESKeySize
 			}
 		}
 
+		/// <summary>
+		/// Gets the AES Version
+		/// 1: AE-1
+		/// 2: AE-2
+		/// </summary>
+		public int AESVersion
+		{
+			get
+			{
+				return _aesVer;
+			}
+		}
+
 		/// <summary>
 		/// AES Encryption strength for storage in extra data in entry header.
 		/// 1 is 128 bit, 2 is 192 bit, 3 is 256 bit.
@@ -1360,7 +1373,7 @@ public static string CleanName(string name)
 
 		private bool forceZip64_;
 		private byte cryptoCheckValue_;
-		private int _aesVer;                            // Version number (2 = AE-2 ?). Assigned but not used.
+		private int _aesVer;                            // Version number (1 = AE-1, 2 = AE-2)
 		private int _aesEncryptionStrength;             // Encryption strength 1 = 128 2 = 192 3 = 256
 
 		#endregion Instance Fields

src/ICSharpCode.SharpZipLib/Zip/ZipInputStream.cs

@@ -375,6 +375,12 @@ protected override void StopDecrypting()
 		/// <param name="testCrc">True if the crc value should be tested</param>
 		private void CompleteCloseEntry(bool testCrc)
 		{
+			// AE-2 does not have a CRC by specification. Do not check CRC in this case.
+			if (entry.AESKeySize != 0 && entry.AESVersion == 2)
+			{
+				testCrc = false;
+			}
+			
 			StopDecrypting();
 
 			if ((flags & 8) != 0)