(Unicode C++) RSA Encrypt Randomly Generated AES Key

Demonstrates how to RSA encrypt a randomly generated AES key.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <CkPrngW.h>
#include <CkBinDataW.h>
#include <CkCertW.h>
#include <CkPublicKeyW.h>
#include <CkRsaW.h>

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

    // First generate a 256-bit AES key (32 bytes).
    CkPrngW prng;
    CkBinDataW bdAesKey;
    bool success = prng.GenRandomBd(32,bdAesKey);

    // Use a public key from a certificate for RSA encryption.
    CkCertW cert;

    success = cert.LoadFromFile(L"qa_data/pem/mf_public_rsa.pem");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkPublicKeyW *pubKey = cert.ExportPublicKey();
    if (cert.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkRsaW rsa;
    success = rsa.ImportPublicKeyObj(*pubKey);
    if (success == false) {
        wprintf(L"%s\n",rsa.lastErrorText());
        return;
    }

    delete pubKey;

    // RSA encrypt our 32-byte AES key.
    // The contents of bdAesKey are replaced with result of the RSA encryption.
    success = rsa.EncryptBd(bdAesKey,false);
    if (success == false) {
        wprintf(L"%s\n",rsa.lastErrorText());
        return;
    }

    // Return the result as a base64 string
    const wchar_t *encryptedAesKey = bdAesKey.getEncoded(L"base64");

    wprintf(L"encrypted AES key = %s\n",encryptedAesKey);
    }