C# Implementations of AES encryption?

This article seems to discuss both the algorithm and a C# implementation that specifically includes 128 bit keysizes: msdn.microsoft.com/en-us/magazine/cc1640....

This article seems to discuss both the algorithm and a C# implementation that specifically includes 128 bit keysizes: msdn.microsoft.com/en-us/magazine/cc1640... There is a code sample available for download, attached to that article. The source code is available to browse online, here: msdn.microsoft.com/en-us/magazine/cc1648... If you just want to use the built-in crypto provider RijndaelManaged, check out the following help article (it also has a simple code sample) msdn.microsoft.com/en-us/library/system.... And just in case you need the sample in a hurry, here it is in all its plagiarized glory: using System; using System. IO; using System.Security.

Cryptography; namespace RijndaelManaged_Examples { class RijndaelMemoryExample { public static void Main() { try { string original = "Here is some data to encrypt! "; // Create a new instance of the RijndaelManaged // class. This generates a new key and initialization // vector (IV).

RijndaelManaged myRijndael = new RijndaelManaged(); // Encrypt the string to an array of bytes. Byte encrypted = encryptStringToBytes_AES(original, myRijndael. Key, myRijndael.

IV); // Decrypt the bytes to a string. String roundtrip = decryptStringFromBytes_AES(encrypted, myRijndael. Key, myRijndael.

IV); //Display the original data and the decrypted data. Console. WriteLine("Original: {0}", original); Console.

WriteLine("Round Trip: {0}", roundtrip); } catch (Exception e) { Console. WriteLine("Error: {0}", e. Message); } } static byte encryptStringToBytes_AES(string plainText, byte Key, byte IV) { // Check arguments.

If (plainText == null || plainText. Length Length AesAlg = new RijndaelManaged(); aesAlg. Key = Key; aesAlg.

IV = IV; // Create a decrytor to perform the stream transform. ICryptoTransform encryptor = aesAlg. CreateEncryptor(aesAlg.

Key, aesAlg. IV); // Create the streams used for encryption. MsEncrypt = new MemoryStream(); csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.

Write); swEncrypt = new StreamWriter(csEncrypt); //Write all data to the stream.SwEncrypt. Write(plainText); } finally { // Clean things up. // Close the streams.

If(swEncrypt! = null) swEncrypt.Close(); if (csEncrypt! = null) csEncrypt.Close(); if (msEncrypt!

= null) msEncrypt.Close(); // Clear the RijndaelManaged object. If (aesAlg! = null) aesAlg.Clear(); } // Return the encrypted bytes from the memory stream.

Return msEncrypt.ToArray(); } static string decryptStringFromBytes_AES(byte cipherText, byte Key, byte IV) { // Check arguments. If (cipherText == null || cipherText. Length Length String plaintext = null; try { // Create a RijndaelManaged object // with the specified key and IV.

AesAlg = new RijndaelManaged(); aesAlg. Key = Key; aesAlg. IV = IV; // Create a decrytor to perform the stream transform.

ICryptoTransform decryptor = aesAlg. CreateDecryptor(aesAlg. Key, aesAlg.

IV); // Create the streams used for decryption. MsDecrypt = new MemoryStream(cipherText); csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode. Read); srDecrypt = new StreamReader(csDecrypt); // Read the decrypted bytes from the decrypting stream // and place them in a string.

Plaintext = srDecrypt.ReadToEnd(); } finally { // Clean things up. // Close the streams. If (srDecrypt!

= null) srDecrypt.Close(); if (csDecrypt! = null) csDecrypt.Close(); if (msDecrypt! = null) msDecrypt.Close(); // Clear the RijndaelManaged object.

If (aesAlg! = null) aesAlg.Clear(); } return plaintext; } } }.

I know this post is quite old, but just a side note for those coming across this. The WinApp code in the linked article titled "Keep Your Data Secure with the New Advanced Encryption Standard" doesn't work. – CODe Jul 8 at 22:33 @CODe - can you be more specific?

Does it not compile? Is there a bug? – Dan Esparza Jul 9 at 16:44 The application runs fine, but it doesn't decrypt.It spits out a string that looks very much like the encrypted version instead, the unencrypted isn't anywhere close to the original version.

– CODe Jul 10 at 1:01.

To use AES, there is the System.Security.Cryptography. RijndaelManaged class.

Yes I understand but I cant seem to figure out how to implement 128 Bit CFB with 32 characters as the key(nibble). Do you kknow how to edit the above code. I jsut got started.

Seem to need more help – ckv Nov 27 '09 at 12:11.

For a more complete example that performs key derivation in addition to the AES encryption, see the answer and links posted in Getting AES encryption to work across Javascript and C#. EDIT a side note: Javascript Cryptography considered harmful. Worth the read.

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