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POAES Decryption Exception change
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copied!<p>I have an AES Cryptography wrapper and unit tests that has been working for over a year. Now after installing VS 2012 (or maybe an update to .net Framework 4) the unit tests do not pass. The streamreader block was throwing a CryptographicException when I passed in a bad pass but is not throwing a ArgumentNullException.</p> <p>The code is up at. <a href="https://github.com/jnaus/Cryptography" rel="nofollow">https://github.com/jnaus/Cryptography</a></p> <p><br/> Here is the unit test that now does not work. (BadSaltTest has the same problem)</p> <pre><code>[TestMethod] [ExpectedException(typeof(CryptographicException), "Bad password was inappropriately allowed")] public void BadPasswordTest() { var cipherText = EncryptString(); var decryptedText = AESCryptography.DecryptStringAES (cipherText,"A bad password", salt); } </code></pre> <p>Test Result: Test method CryptographyTest.AESTest.BadPasswordTest threw exception System.ArgumentNullException, but exception System.Security.Cryptography.CryptographicException was expected. Exception message: System.ArgumentNullException: Value cannot be null. Parameter name: inputBuffer</p> <p>Decrypt code.</p> <pre><code>public static string DecryptStringAES(string cipherText, string password, byte[] salt) { RijndaelManaged aesAlg = null; string plaintext = null; try { // generate the key from the shared secret and the salt Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(password, salt); // Create a RijndaelManaged object // with the specified key and IV. aesAlg = new RijndaelManaged(); aesAlg.Key = key.GetBytes(aesAlg.KeySize/8); aesAlg.IV = key.GetBytes(aesAlg.BlockSize/8); // Create a decrytor to perform the stream transform. ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV); // Create the streams used for decryption. byte[] bytes = Convert.FromBase64String(cipherText); using (MemoryStream msDecrypt = new MemoryStream(bytes)) { using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) { //StreamReader now gives ArgumentNullException using (StreamReader srDecrypt = new StreamReader(csDecrypt)) { // Read the decrypted bytes from the decrypting stream // and place them in a string. plaintext = srDecrypt.ReadToEnd(); } } } } finally { // Clear the RijndaelManaged object. if (aesAlg != null) { aesAlg.Clear(); } } return plaintext; } </code></pre>

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