3DES Encryption (Triple-DES, 168-bit, TDEA, TDES)

Demonstrates 168-bit 3DES encryption.

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#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    CkCrypt2 crypt;

    bool success;
    success = crypt.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        //  Unlock failed.
        printf("%s\n",crypt.lastErrorText());
        return;
    }

    //  To get 3DES, set the algorithm = "des", and the
    //  key length to 168 bits:
    crypt.put_CryptAlgorithm("des");
    crypt.put_KeyLength(168);

    //  The encrypted output will be a hex-encoded string.
    //  It is also possible to use "base64", "url" (for url-encoding), and other modes.
    crypt.put_EncodingMode("hex");

    //  Both ECB and CBC modes are available.
    //  Use "ecb" for Electronic Cookbook Mode.
    //  "cbc" is for Cipher-Block-Chaining.
    crypt.put_CipherMode("cbc");

    //  Initialization vectors should equal the block-size of the algorithm.
    //  for 3DES (and DES) the block-size is 8 bytes.
    //  The IV may be set from an encoded string:
    crypt.SetEncodedIV("0102030405060708","hex");

    //  (it is also possible to set the IV directly from a byte array...)

    //  The secret key should have a length equal to the bit-strength of
    //  the algorithm.   In this case, we have 168-bit 3DES.  However,
    //  with DES (and 3DES) the most significant bit of each key byte is
    //  a parity bit, and therefore 168-bits really refers to a 192-bit key
    //  where the 24 msb's are parity bits.  Our 3DES key should be 24 bytes in size.
    crypt.SetEncodedKey("010203040506070801020304050607080102030405060708","hex");

    //  (it is also possible to set the key directly from a byte array, or generate
    //  a key from a arbitrary-length string password.)

    //  3DES is a block encryption algorithm.  This means that output is always
    //  a multiple of the algorithm's block size.  For 3DES, the block size is 8 bytes.
    //  Therefore, if your input is not a multiple of 8 bytes, it will be padded.
    //  There are several choices for padding (consult the Chilkat Crypt reference).
    //  We'll pad with SPACE (0x20) characters:
    crypt.put_PaddingScheme(4);

    //  Note: If trying to match the results produced by two different 3DES implementations,
    //  make sure to test with data that is longer than a single block (8 bytes for 3DES).
    //  If all params match (IV, secret key, cipher mode, etc.) except for the padding, then
    //  the results will be identical except for the last block of output.  If you test data is only
    //  a single block, you cannot recognize the situation where all is correct except
    //  for a padding mismatch.

    const char * cipherText;
    const char * plainText;

    cipherText = crypt.encryptStringENC("ABCDEFGHIJKLMNLPQRSTUVWXYZ");
    printf("%s\n",cipherText);
    plainText = crypt.decryptStringENC(cipherText);
    printf("%s\n",plainText);

    //  Note: Because we used SPACE character padding, the output string will contain trailing SPACE
    //  chars, which can easily be trimmed.

    //  (Other padding schemes embed the original input length in the padding so that the Decrypt* methods always
    //  return the exact original data).

    }