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

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

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // 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");
    strOut.append(encryptedStr);
    strOut.append("\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);
    strOut.append(urlEncoded);
    strOut.append("\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);
    strOut.append(encBase64);
    strOut.append("\r\n");

    // Now decrypt...
    crypt.put_CryptAlgorithm("aes");
    crypt.put_EncodingMode("base64");
    const char *originalStr = crypt.decryptStringENC(encBase64);
    strOut.append(originalStr);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }