(MFC) Generate RSA Key and Export to Encrypted PEM

MFC sample showing how to generate an RSA key and export to encrypted PEM.

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkRsa rsa;

    // Generate a 1024-bit key.  Chilkat RSA supports
    // key sizes ranging from 512 bits to 4096 bits.
    bool success = rsa.GenerateKey(1024);
    if (success != true) {
        strOut.append(rsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Get the private key as unencrypted XML:
    const char *keyXml = rsa.exportPrivateKey();
    strOut.append(keyXml);
    strOut.append("\r\n");

    // To encrypt the key -- meaning to get the key in
    // an encrypted PEM format -- load it into a PrivateKey object,
    // and then export to encrypted PEM:
    CkPrivateKey privKey;

    success = privKey.LoadXml(keyXml);
    if (success != true) {
        strOut.append(privKey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    const char *strEncPem = 0;

    strEncPem = privKey.getPkcs8EncryptedPem("myPassword");

    // You now have the private key in an encrypted format,
    // which may be (for example) saved to a database


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }