(MFC) Duplicate openssl pkey -in private.pem -pubout -out pubkey.pem

How to output the public part of a private key: Demonstrates how to duplicate this OpenSSL command:

openssl pkey -in private.pem -pubout -out pubkey.pem

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

    CkPrivateKey pkey;

    // Load the private key from an PEM file:
    bool success = pkey.LoadPemFile("private.pem");
    if (success != true) {
        strOut.append(pkey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkPublicKey *pubKey = pkey.GetPublicKey();
    if (pkey.get_LastMethodSuccess() == false) {
        strOut.append(pkey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    success = pubKey->SaveOpenSslPemFile("pubKey.pem");
    if (success != true) {
        strOut.append(pubKey->lastErrorText());
        strOut.append("\r\n");
        delete pubKey;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

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

    delete pubKey;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }