C

2-Key Triple DES (112 bits)

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Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption). C

#include <C_CkCrypt2.h>

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

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

    crypt = CkCrypt2_Create();

    // Specify 3DES for the encryption algorithm:
    CkCrypt2_putCryptAlgorithm(crypt,"3des");

    CkCrypt2_putCipherMode(crypt,"ecb");

    // For 2-Key Triple-DES, use a key length of 128
    // (Given that each byte's msb is a parity bit, the strength is really 112 bits).
    CkCrypt2_putKeyLength(crypt,128);

    // Pad with zeros
    CkCrypt2_putPaddingScheme(crypt,3);

    // 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");

    // Let's create a secret key by using the MD5 hash of a password.
    // The Digest-MD5 algorithm produces a 16-byte hash (i.e. 128 bits)
    CkCrypt2_putHashAlgorithm(crypt,"md5");
    keyHex = CkCrypt2_hashStringENC(crypt,"secretPassword");

    // Set the encryption key:
    CkCrypt2_SetEncodedKey(crypt,keyHex,"hex");

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

    // Now decrypt:
    decStr = CkCrypt2_decryptStringENC(crypt,encStr);
    printf("%s\n",decStr);


    CkCrypt2_Dispose(crypt);

    }