[Mono-bugs] [Bug 80441][Nor] New - Case where successive decryption fails using same bytearray

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Changed by lauren.bedoule at gmail.com.

http://bugzilla.ximian.com/show_bug.cgi?id=80441

--- shadow/80441	2007-01-03 11:08:40.000000000 -0500
+++ shadow/80441.tmp.30517	2007-01-03 11:08:40.000000000 -0500
@@ -0,0 +1,62 @@
+Bug#: 80441
+Product: Mono: Class Libraries
+Version: 1.2
+OS: 
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: CORLIB
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: lauren.bedoule at gmail.com               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Case where successive decryption fails using same bytearray
+
+Description of Problem:
+Decryption fails if input and output objects are the same ones,
+given:
+- you use default mode (CBC),
+- default padding,
+- and you do two successive decryptions.
+
+Unit test to reproduce:
+        [Test]
+        public void Transform2()
+        {
+            byte[] key = { 0, 1, 2, 3, 4, 5, 6, 7 };
+            byte[] iv = { 0, 1, 2, 3, 4, 5, 6, 7 };
+            byte[] expected = { 0xFF, 0x4B, 0x11, 0x74, 0xEF, 0x14, 0xC8,
+0xE9,0x35, 0x20, 0xB2, 0x83, 0x76, 0x7F, 0xF0, 0xC4,0xFF, 0x4A, 0x13, 0x77,
+0xEB, 0x11, 0xCE, 0xEE, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}; 
+            byte[] input = { 0x2A, 0xA2, 0x2A, 0xF4, 0x4E, 0x52, 0xBA,
+0xD5, 0x1A, 0x64, 0x5A, 0xD3, 0x9D, 0xA5, 0x6D, 0x45, 0x37, 0xF3, 0x2C,
+0x41, 0x60, 0x1E, 0xB , 0x49, 0x66, 0x3 , 0xC8, 0xAC, 0xA7, 0x58, 0x60,
+0xD4, 0x1F, 0x1C, 0xB5, 0xB6, 0xAB, 0xA2, 0xC8, 0xE8, 0xB9, 0xD1, 0x14,
+0x94, 0x28, 0x8E, 0x36, 0x90, 0x3 , 0xBA, 0xB7, 0xBE, 0x33, 0xBC, 0x68,
+0xED, 0x2A, 0xDE, 0x6A, 0x4F, 0x4E, 0x4C, 0x26, 0xFB};
+            DES des = DES.Create();
+            byte[] result = new byte[64]; // could have been 56, see bug 80439
+            ICryptoTransform decryptor = des.CreateDecryptor(key, iv);    
+       
+            int len = decryptor.TransformBlock(input, 0, input.Length,
+result, 0);
+            Assert.IsTrue(len == 56, "1st transform");
+            len = decryptor.TransformBlock(result, 0, len, result, 0);
+            Assert.IsTrue(len == 56, "2nd transform");
+            Assert.AreEqual(result, expected, "wrong ouput data");
+        }
+
+Actual Results:
+decrypted data differ from expected ones
+
+Additional Information:
+Test fails under M$ too, yet with a different output. It seems their
+implementation is buggy too, as soon as you use same object as input and
+output. But I let you send the bug to them...
+I still have a doubt with this test. Let me know if it's invalid.