C++

RSA Encrypt and OpenSSL Decrypt

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Demonstrates how to use Chilkat to RSA encrypt, and then use OpenSSL to decrypt. C++

#include <CkRsa.h>
#include <CkPrivateKey.h>
#include <CkPublicKey.h>
#include <CkBinData.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkRsa rsa;

    CkPrivateKey privKey;
    success = rsa.GenKey(2048,privKey);
    success = privKey.SavePkcs8PemFile("qa_output/privKey.pem");

    CkPublicKey pubKey;
    privKey.ToPublicKey(pubKey);

    rsa.put_EncodingMode("base64");
    const char *plainText = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890";
    bool bUsePrivateKey = false;
    rsa.UsePublicKey(pubKey);
    const char *encryptedStr = rsa.encryptStringENC(plainText,bUsePrivateKey);

    CkBinData bd;
    bd.AppendEncoded(encryptedStr,"base64");
    success = bd.WriteFile("qa_output/enc.dat");

    // The OpenSSL command to decrypt is:
    // openssl pkeyutl -in enc.dat -inkey privKey.pem -keyform PEM -pkeyopt rsa_padding_mode:pkcs1 -decrypt

    std::cout << "OK" << "\r\n";
    }