TripleDES

[intersoln]

Hi,

I tried encrypting and decrypting a string using the following Java code and key. And was successful.

Then, I used the following C# to encrypt and decrypt a string using the following C# code and key. And was successful.

But when i tried to encrypted using java and decrypted using C#, but it was not successful.

Can someone please help? THanks in advanced.


[JAVA code]
private static String algorithm = "DESede";
private static Key key = null;
private static Cipher cipher = null;

private static void setUp() throws Exception {
key = new SecretKeySpec(" 123456789012345 678901234".getB ytes(), algorithm);
cipher = Cipher.getInsta nce(algorithm);
}

public static void main(String[] args) throws Exception {
setUp();
byte[] encryptionBytes = null;
encryptionBytes = encrypt("This is a testing");
System.out.prin tln("Recovered: " + decrypt(encrypt ionBytes));
}

private static byte[] encrypt(String input) throws InvalidKeyExcep tion,
BadPaddingExcep tion, IllegalBlockSiz eException {
cipher.init(Cip her.ENCRYPT_MOD E, key);
byte[] inputBytes = input.getBytes( );
return cipher.doFinal( inputBytes);
}

private static String decrypt(byte[] encryptionBytes ) throws
InvalidKeyExcep tion, BadPaddingExcep tion, IllegalBlockSiz eException {
cipher.init(Cip her.DECRYPT_MOD E, key);
byte[] recoveredBytes = cipher.doFinal( encryptionBytes );
String recovered = new String(recovere dBytes);
return recovered;
}

[C# Code]
static void Main()
{
try
{
TripleDESCrypto ServiceProvider tDESalg = new
TripleDESCrypto ServiceProvider ();

// Create a string to encrypt.
string sData = "This is a testing";

// Encrypt the string to an in-memory buffer.
byte[] key = Encoding.UTF8.G etBytes("123456 789012345678901 234");
byte[] Data = EncryptTextToMe mory(sData, key, key);

string Final = DecryptTextFrom Memory(Data, key, key);
// Display the decrypted string to the console.
Console.WriteLi ne(Final);
}
catch (Exception e)
{
Console.WriteLi ne(e.Message);
}
}

public static byte[] EncryptTextToMe mory(string Data, byte[] Key, byte[] IV)
{
try
{
// Create a MemoryStream.
MemoryStream mStream = new MemoryStream();

// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream(mS tream,
new TripleDESCrypto ServiceProvider ().CreateEncryp tor(Key, IV),
CryptoStreamMod e.Write);

// Convert the passed string to a byte array.
byte[] toEncrypt = Encoding.UTF8.G etBytes(Data);

// Write the byte array to the crypto stream and flush it.
cStream.Write(t oEncrypt, 0, toEncrypt.Lengt h);
cStream.FlushFi nalBlock();

// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
byte[] ret = mStream.ToArray ();

// Close the streams.
cStream.Close() ;
mStream.Close() ;

// Return the encrypted buffer.
return ret;
}
catch (CryptographicE xception e)
{
Console.WriteLi ne("A Cryptographic error occurred: {0}", e.Message);
return null;
}
}

public static string DecryptTextFrom Memory(byte[] Data, byte[] Key, byte[] IV)
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream msDecrypt = new MemoryStream(Da ta);

// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream csDecrypt = new CryptoStream(ms Decrypt,
new TripleDESCrypto ServiceProvider ().CreateDecryp tor(Key, IV),
CryptoStreamMod e.Read);

// Create buffer to hold the decrypted data.
byte[] fromEncrypt = new byte[Data.Length];

// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Len gth);

//Convert the buffer into a string and return it.
return new ASCIIEncoding() .GetString(from Encrypt);
}
catch (CryptographicE xception e)
{
Console.WriteLi ne("A Cryptographic error occurred: {0}", e.Message);
return null;
}
}