(MFC) RSA Encrypt and OpenSSL Decrypt

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

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkRsa rsa;

    bool success = rsa.GenerateKey(2048);

    CkPrivateKey *privKey = rsa.ExportPrivateKeyObj();
    success = privKey->SavePkcs8PemFile("qa_output/privKey.pem");
    delete privKey;

    rsa.put_EncodingMode("base64");
    const char *plainText = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890";
    bool bUsePrivateKey = false;
    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

    strOut.append("OK");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }