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POWhy are RijndaelManaged and AesCryptoServiceProvider returning different results?
 

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  1. POWhy are RijndaelManaged and AesCryptoServiceProvider returning different results?
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    <p>Here is the example that I have run. It has the same Mode, Padding, BlockSize, KeySize. I am using the same init vector, key and data.</p> <p>Using the RijndaelManaged produces an encrypted value of: 0x8d,0x81,0x27,0xc6,0x3c,0xe2,0x53,0x2f,0x35,0x78,0x90,0xc2,0x2e,0x3b,0x8a,0x61, 0x41,0x47,0xd6,0xd0,0xff,0x92,0x72,0x3d,0xc6,0x16,0x2b,0xd8,0xb5,0xd9,0x12,0x85</p> <p>Using the AesCryptoServiceProvider produces an encrypted value of: 0x8d,0x9f,0x6e,0x99,0xe9,0x54,0x8b,0x12,0xa9,0x88,0x1a,0x3d,0x65,0x23,0x9c,0x4e, 0x18,0x5a,0x89,0x31,0xf5,0x75,0xc5,0x9e,0x0d,0x43,0xe9,0x86,0xd4,0xf3,0x64,0x3a</p> <p>Here is the code I used to generate these results</p> <pre> <code> public partial class AesTest { private SymmetricAlgorithm mEncryptionType; private byte[] mPrivateKey; private byte[] mInitializationVector; private byte[] mData; public AesTest() { mPrivateKey = new byte[32] { 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22 }; mInitializationVector = new byte[16] { 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33 }; mData = new byte[16] { 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44 }; mEncryptionType = new RijndaelManaged(); mEncryptionType.Mode = CipherMode.CFB; mEncryptionType.Padding = PaddingMode.PKCS7; mEncryptionType.BlockSize = 128; mEncryptionType.KeySize = 256; byte[] rij_encrypted_data = Encrypt(mData); mEncryptionType = new AesCryptoServiceProvider(); mEncryptionType.Mode = CipherMode.CFB; mEncryptionType.Padding = PaddingMode.PKCS7; mEncryptionType.BlockSize = 128; mEncryptionType.KeySize = 256; byte[] aes_encrypted_data = Encrypt(mData); } public virtual byte[] Encrypt(byte[] unencryptedData) { return TransformData(unencryptedData, mEncryptionType.CreateEncryptor(mPrivateKey, mInitializationVector)); } private byte[] TransformData(byte[] dataToTransform, ICryptoTransform cryptoTransform) { byte[] result = new byte[0]; if (dataToTransform != null && cryptoTransform != null && dataToTransform.Length > 0) { // Create the memory stream to store the results MemoryStream mem_stream = new MemoryStream(); // Create the crypto stream to do the transformation CryptoStream crypto_stream = new CryptoStream(mem_stream, cryptoTransform, CryptoStreamMode.Write); // bytes are transformed on a write crypto_stream.Write(dataToTransform, 0, dataToTransform.Length); // Flush the final block crypto_stream.FlushFinalBlock(); // Convert the transformed memory stream back to a byte array result = mem_stream.ToArray(); // Close the streams mem_stream.Close(); crypto_stream.Close(); } return result; } } </code> </pre> <p>I guess I'm just wondering if I missed something.</p> <p><b> Update: </b> Turns out that <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.aesmanaged.aspx" rel="noreferrer">AesManaged</a> will throw a CryptographicException ("The specified cipher mode is not valid for this algorithm") if you try and set the CipherMode to CFB. I feel that the <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.aescryptoserviceprovider.aspx" rel="noreferrer">AesCryptoServiceProvider</a> should do that same, but it doesnt. Seems funny that the FIPS Certified class allows invalid cipher modes.</p>
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    1. COThis question came out of discussion of: http://stackoverflow.com/questions/939040/when-will-c-aes-algorithm-be-fips-compliant
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