3DES Encryption, ECB, CBC modes

3DES encryption. The Chilkat encryption component supports Triple-DES in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) cipher modes.

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Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

bool success;
success = crypt.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    MessageBox.Show("Crypt component unlock failed");
    return;
}

//  Specify 3DES for the encryption algorithm:
crypt.CryptAlgorithm = "3des";

//  CipherMode may be "ecb" or "cbc"
crypt.CipherMode = "cbc";

//  KeyLength must be 192.  3DES is technically 168-bits;
//  the most-significant bit of each key byte is a parity bit,
//  so we must indicate a KeyLength of 192, which includes
//  the parity bits.
crypt.KeyLength = 192;

//  The padding scheme determines the contents of the bytes
//  that are added to pad the result to a multiple of the
//  encryption algorithm's block size.  3DES has a block
//  size of 8 bytes, so encrypted output is always
//  a multiple of 8.
crypt.PaddingScheme = 0;

//  EncodingMode specifies the encoding of the output for
//  encryption, and the input for decryption.
//  It may be "hex", "url", "base64", or "quoted-printable".
crypt.EncodingMode = "hex";

//  An initialization vector is required if using CBC or CFB modes.
//  ECB mode does not use an IV.
//  The length of the IV is equal to the algorithm's block size.
//  It is NOT equal to the length of the key.
string ivHex;
ivHex = "0001020304050607";
crypt.SetEncodedIV(ivHex,"hex");

//  The secret key must equal the size of the key.  For
//  3DES, the key must be 24 bytes (i.e. 192-bits).
string keyHex;
keyHex = "000102030405060708090A0B0C0D0E0F0001020304050607";
crypt.SetEncodedKey(keyHex,"hex");

//  Encrypt a string...
//  The input string is 44 ANSI characters (i.e. 44 bytes), so
//  the output should be 48 bytes (a multiple of 8).
//  Because the output is a hex string, it should
//  be 96 characters long (2 chars per byte).
string encStr;
encStr = crypt.EncryptStringENC("The quick brown fox jumps over the lazy dog.");
MessageBox.Show(encStr);

//  Now decrypt:
string decStr;
decStr = crypt.DecryptStringENC(encStr);
MessageBox.Show(decStr);