56-bit DES Encryption, ECB, CBC modes

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

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#include <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    BOOL success;
    const char * ivHex;
    const char * keyHex;
    const char * encStr;
    const char * decStr;

    crypt = CkCrypt2_Create();

    success = CkCrypt2_UnlockComponent(crypt,"Anything for 30-day trial");
    if (success != TRUE) {
        printf("Crypt component unlock failed\n");
        return;
    }

    //  Specify DES for the encryption algorithm:
    CkCrypt2_putCryptAlgorithm(crypt,"des");

    //  CipherMode may be "ecb" or "cbc"
    CkCrypt2_putCipherMode(crypt,"cbc");

    //  KeyLength must be 64.  DES is technically 56-bits;
    //  the most-significant bit of each key byte is a parity bit,
    //  so we must indicate a KeyLength of 64, which includes
    //  the parity bits.
    CkCrypt2_putKeyLength(crypt,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.
    CkCrypt2_putPaddingScheme(crypt,0);

    //  EncodingMode specifies the encoding of the output for
    //  encryption, and the input for decryption.
    //  It may be "hex", "url", "base64", or "quoted-printable".
    CkCrypt2_putEncodingMode(crypt,"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.

    ivHex = "0001020304050607";
    CkCrypt2_SetEncodedIV(crypt,ivHex,"hex");

    //  The secret key must equal the size of the key.  For
    //  DES, the key must be 8 bytes (i.e. 64-bits).

    keyHex = "0001020304050607";
    CkCrypt2_SetEncodedKey(crypt,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).

    encStr = CkCrypt2_encryptStringENC(crypt,"The quick brown fox jumps over the lazy dog.");
    printf("%s\n",encStr);

    //  Now decrypt:

    decStr = CkCrypt2_decryptStringENC(crypt,encStr);
    printf("%s\n",decStr);

    CkCrypt2_Dispose(crypt);

    }