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POEncryption in .NET and decryption in Android throws BadPaddingException: pad block corrupted
 

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  1. POEncryption in .NET and decryption in Android throws BadPaddingException: pad block corrupted
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    <p>I did lot of research but i couldn't find answer to my issue. I'm doing AES encryption (Rijndael block size 128 bits) in .NET and decryption in Android (AES) with same password, salt &amp; IV between them. </p> <p>C# Encryption code snippet:</p> <pre><code> byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector); byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue); byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText); PasswordDeriveBytes password = new PasswordDeriveBytes( passPhrase, saltValueBytes, hashAlgorithm, passwordIterations); byte[] keyBytes = password.GetBytes(keySize / 8); RijndaelManaged symmetricKey = new RijndaelManaged(); symmetricKey.Padding = PaddingMode.PKCS7; symmetricKey.BlockSize = 128; symmetricKey.Mode = CipherMode.CBC; ICryptoTransform encryptor = symmetricKey.CreateEncryptor( keyBytes, initVectorBytes); MemoryStream memoryStream = new MemoryStream(); CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write); cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length); cryptoStream.FlushFinalBlock(); byte[] cipherTextBytes = memoryStream.ToArray(); memoryStream.Close(); cryptoStream.Close(); string cipherText = Convert.ToBase64String(cipherTextBytes); </code></pre> <p>Android Decryption code snippet:</p> <pre><code> KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), iterationCount); SecretKey key = SecretKeyFactory.getInstance( "PBEWithSHA1And128BitAES-CBC-BC").generateSecret(keySpec); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC"); cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv.getBytes())); byte[] decrypted = cipher.doFinal(encrypted); </code></pre> <p>cipher.doFinal call throws following exception. </p> <p>"05-02 18:17:38.239: W/System.err(25547): javax.crypto.BadPaddingException: pad block corrupted"</p> <p>I did set the padding to "PKCS7Padding" in both .NET and Android and the encryption block size to 128 bits. </p> <p>However, encrypt in Android &amp; decrypt in Android works fine. Same with Encrypt in .NET and Decrypt in .NET works fine too. </p> <p>Sample Test:</p> <pre><code>String PlainText = "hello world"; String EncryptedDotNetblob = "JyijoGEALMI25Zej7d+fMg=="; String EncryptedAndroidblob = "1HhuTQaLRJEK4zxI9FAO6A=="; </code></pre> <p>as you can see above blobs are different too. </p> <p>Anyone knows what's the problem here?</p>
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    1. USSatish Shetty
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    1. CONot sure, but doesn't `String.toCharArray()` return _characters_, which are 16 bits in Java, as opposed to the _bytes_ you have in the C# code?
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      1. USRob I
    2. CO@Satish Hi, you got the solution for your issue?
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      1. USRajesh Rajaram
 

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