(C) 56-bit DES Encryption, ECB, CBC modes

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

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#include <C_CkCrypt2.h>

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

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

    crypt = CkCrypt2_Create();

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

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

    // Keylength is 64 bits (56 bits + 8 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);

    }