C

AES Encrypt String (utf-8 byte representation) and return Base64

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Demonstrates how to AES encrypt the utf-8 byte representation of a string and return in base64 format. C

#include <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    const char *ivHex;
    const char *keyHex;
    const char *encryptedStr;
    const char *urlEncoded;
    const char *encBase64Url;
    const char *encBase64;
    const char *originalStr;

    // 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");
    CkCrypt2_putCipherMode(crypt,"cbc");
    CkCrypt2_putKeyLength(crypt,256);
    CkCrypt2_putCharset(crypt,"utf-8");
    CkCrypt2_putEncodingMode(crypt,"base64");

    ivHex = "000102030405060708090A0B0C0D0E0F";
    CkCrypt2_SetEncodedIV(crypt,ivHex,"hex");
    keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
    CkCrypt2_SetEncodedKey(crypt,keyHex,"hex");

    encryptedStr = CkCrypt2_encryptStringENC(crypt,"This is the original string");
    printf("%s\n",encryptedStr);

    // Let's say we want to URL encode the base64 string..
    CkCrypt2_putCryptAlgorithm(crypt,"none");
    CkCrypt2_putEncodingMode(crypt,"url");
    urlEncoded = CkCrypt2_encryptStringENC(crypt,encryptedStr);
    printf("%s\n",urlEncoded);

    // Sample output:

    //  q3fmgEqjqa9o//ZS6aPuh4Wtbrrxx/WOIQSKeVnesZg=
    //  q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D

    // -------------------------------------------------------------------
    // Now let's do the reverse...
    // 

    // We start with a string that is the binary encrypted data, base64 encoded, and then URL encoded.
    encBase64Url = "q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D";

    // We'll use the same crypt object.  If using a new instance of the crypt object,
    // make sure *all* settings are identical:  the algorithm, cipher mode, key length, charset, encoding mode, IV, and secret key.

    // Decode from URL...
    CkCrypt2_putCryptAlgorithm(crypt,"none");
    CkCrypt2_putEncodingMode(crypt,"url");
    encBase64 = CkCrypt2_decryptStringENC(crypt,urlEncoded);
    printf("%s\n",encBase64);

    // Now decrypt...
    CkCrypt2_putCryptAlgorithm(crypt,"aes");
    CkCrypt2_putEncodingMode(crypt,"base64");
    originalStr = CkCrypt2_decryptStringENC(crypt,encBase64);
    printf("%s\n",originalStr);


    CkCrypt2_Dispose(crypt);

    }