aes.c

This program encrypts some bytes using AES and a common library

#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("%s\n",CkCrypt2_lastErrorText(crypt));
        return;
    }

    //  AES is also known as Rijndael.
    CkCrypt2_putCryptAlgorithm(crypt,"aes");

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

    //  KeyLength may be 128, 192, 256
    CkCrypt2_putKeyLength(crypt,256);

    //  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.  AES has a block
    //  size of 16 bytes, so encrypted output is always
    //  a multiple of 16.
    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 mode.
    //  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 = "000102030405060708090A0B0C0D0E0F";
    CkCrypt2_SetEncodedIV(crypt,ivHex,"hex");

    //  The secret key must equal the size of the key.  For
    //  256-bit encryption, the binary secret key is 32 bytes.
    //  For 128-bit encryption, the binary secret key is 16 bytes.

    keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
    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 16).
    //  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);

    }