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 <CkCrypt2.h>

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

    CkCrypt2 crypt;

    crypt.put_CryptAlgorithm("aes");
    crypt.put_CipherMode("cbc");
    crypt.put_KeyLength(256);
    crypt.put_Charset("utf-8");
    crypt.put_EncodingMode("base64");

    const char *ivHex = "000102030405060708090A0B0C0D0E0F";
    crypt.SetEncodedIV(ivHex,"hex");
    const char *keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
    crypt.SetEncodedKey(keyHex,"hex");

    const char *encryptedStr = crypt.encryptStringENC("This is the original string");
    std::cout << encryptedStr << "\r\n";

    // Let's say we want to URL encode the base64 string..
    crypt.put_CryptAlgorithm("none");
    crypt.put_EncodingMode("url");
    const char *urlEncoded = crypt.encryptStringENC(encryptedStr);
    std::cout << urlEncoded << "\r\n";

    // 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.
    const char *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...
    crypt.put_CryptAlgorithm("none");
    crypt.put_EncodingMode("url");
    const char *encBase64 = crypt.decryptStringENC(urlEncoded);
    std::cout << encBase64 << "\r\n";

    // Now decrypt...
    crypt.put_CryptAlgorithm("aes");
    crypt.put_EncodingMode("base64");
    const char *originalStr = crypt.decryptStringENC(encBase64);
    std::cout << originalStr << "\r\n";
    }