C

AES OFB Output Feedback Mode Encryption

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Demonstrates how to encrypt using AES OFB (Output Feedback) mode. C

#include <C_CkCrypt2.h>

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

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

    crypt = CkCrypt2_Create();

    CkCrypt2_putCryptAlgorithm(crypt,"aes");
    // Set the cipher mode to Output Feedback
    CkCrypt2_putCipherMode(crypt,"ofb");
    CkCrypt2_putKeyLength(crypt,256);

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

    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.
    keyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4";
    CkCrypt2_SetEncodedKey(crypt,keyHex,"hex");

    // Encrypt a string...
    encStr = CkCrypt2_encryptStringENC(crypt,"Popular opinions, on subjects not palpable to sense, are often true, but seldom or never the whole truth. -- John Stuart Mill");
    printf("%s\n",encStr);

    decrypt = CkCrypt2_Create();
    CkCrypt2_putCryptAlgorithm(decrypt,"aes");
    CkCrypt2_putCipherMode(decrypt,"ofb");
    CkCrypt2_putKeyLength(decrypt,256);
    CkCrypt2_putEncodingMode(decrypt,"hex");
    CkCrypt2_SetEncodedIV(decrypt,ivHex,"hex");
    CkCrypt2_SetEncodedKey(decrypt,keyHex,"hex");

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


    CkCrypt2_Dispose(crypt);
    CkCrypt2_Dispose(decrypt);

    }