C++

56-bit DES Encryption, ECB, CBC modes

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Demonstrates the older 56-bit DES encryption in ECB and CBC modes. C++

#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    //  This example assumes the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkCrypt2 crypt;

    //  Specify DES for the encryption algorithm:
    crypt.put_CryptAlgorithm("des");

    //  CipherMode may be "ecb" or "cbc"
    crypt.put_CipherMode("cbc");

    //  Keylength is 64 bits (56 bits + 8 parity bits)
    crypt.put_KeyLength(64);

    //  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.  DES has a block
    //  size of 8 bytes, so encrypted output is always
    //  a multiple of 8.
    crypt.put_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.put_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.
    const char *ivHex = "0001020304050607";
    crypt.SetEncodedIV(ivHex,"hex");

    //  The secret key must equal the size of the key.  For 
    //  DES, the key must be 8 bytes (i.e. 64-bits).
    const char *keyHex = "0001020304050607";
    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).
    const char *encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.");
    std::cout << encStr << "\r\n";

    //  Now decrypt:
    const char *decStr = crypt.decryptStringENC(encStr);
    std::cout << decStr << "\r\n";
    }