AES Encryption in C# and decryption in CryptoJS
I would like to do AES Encryption in C# and decryption in CryptoJS.
Answer
It is working now after getting some reference from Google CryptoJS group (https://groups.google.com/forum/#!msg/crypto-js/ysgzr2Wxt_k/_Wh8l_1rhQAJ).
Here is encryption code in C#.NET.
public class ClsCrypto
{
private RijndaelManaged myRijndael = new RijndaelManaged();
private int iterations;
private byte [] salt;
public ClsCrypto(string strPassword)
{
myRijndael.BlockSize = 128;
myRijndael.KeySize = 128;
myRijndael.IV = HexStringToByteArray("e84ad660c4721ae0e84ad660c4721ae0");
myRijndael.Padding = PaddingMode.PKCS7;
myRijndael.Mode = CipherMode.CBC;
iterations = 1000;
salt = System.Text.Encoding.UTF8.GetBytes("insight123resultxyz");
myRijndael.Key = GenerateKey(strPassword);
}
public string Encrypt(string strPlainText)
{
byte [] strText = new System.Text.UTF8Encoding().GetBytes(strPlainText);
ICryptoTransform transform = myRijndael.CreateEncryptor();
byte [] cipherText = transform.TransformFinalBlock(strText, 0, strText.Length);
return Convert.ToBase64String(cipherText);
}
public string Decrypt(string encryptedText)
{
byte[] encryptedBytes = Convert.FromBase64String(encryptedText);
var decryptor = myRijndael.CreateDecryptor(myRijndael.Key, myRijndael.IV);
byte[] originalBytes = decryptor.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
return Encoding.UTF8.GetString(originalBytes);
}
public static byte [] HexStringToByteArray(string strHex)
{
dynamic r = new byte[strHex.Length / 2];
for (int i = 0; i <= strHex.Length - 1; i += 2)
{
r[i/2] = Convert.ToByte(Convert.ToInt32(strHex.Substring(i, 2), 16));
}
return r;
}
private byte[] GenerateKey(string strPassword)
{
Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(System.Text.Encoding.UTF8.GetBytes(strPassword), salt, iterations);
return rfc2898.GetBytes(128 / 8);
}
}
Following is decryption code in Java script.
<head runat="server">
<script src="rollups/aes.js" type="text/javascript"></script>
<script src="rollups/sha256.js" type="text/javascript"></script>
<script src="rollups/pbkdf2.js" type="text/javascript"></script>
<script type="text/javascript">
function DecryptData() {
var encryptData = document.getElementById('TextEncrypted').value;
var decryptElement = document.getElementById('TextDecrypt');
try {
//Creating the Vector Key
var iv = CryptoJS.enc.Hex.parse('e84ad660c4721ae0e84ad660c4721ae0');
//Encoding the Password in from UTF8 to byte array
var Pass = CryptoJS.enc.Utf8.parse('insightresult');
//Encoding the Salt in from UTF8 to byte array
var Salt = CryptoJS.enc.Utf8.parse("insight123resultxyz");
//Creating the key in PBKDF2 format to be used during the decryption
var key128Bits1000Iterations = CryptoJS.PBKDF2(Pass.toString(CryptoJS.enc.Utf8), Salt, { keySize: 128 / 32, iterations: 1000 });
//Enclosing the test to be decrypted in a CipherParams object as supported by the CryptoJS libarary
var cipherParams = CryptoJS.lib.CipherParams.create({
ciphertext: CryptoJS.enc.Base64.parse(encryptData)
});
//Decrypting the string contained in cipherParams using the PBKDF2 key
var decrypted = CryptoJS.AES.decrypt(cipherParams, key128Bits1000Iterations, { mode: CryptoJS.mode.CBC, iv: iv, padding: CryptoJS.pad.Pkcs7 });
decryptElement.value = decrypted.toString(CryptoJS.enc.Utf8);
}
//Malformed UTF Data due to incorrect password
catch (err) {
return "";
}
}
</script>
</head>