(MFC) Convert DSA PEM Private Key to DER

Converts a DSA private key from PEM format to DER. The first part of the example will convert an unencrypted PEM to DER, then 2nd part will convert an encrypted PEM to unencrypted DER.

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

See Also: Using MFC CString in Chilkat

#include <CkDsa.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkDsa dsa;

    // Load a PEM private key.
    const char *pemPrivateKey = 0;
    pemPrivateKey = dsa.loadText("dsa_priv.pem");
    // Import the unencrypted PEM into the DSA object.
    bool success = dsa.FromPem(pemPrivateKey);
    if (success != true) {
        strOut.append(dsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Write it out as a DER file:
    success = dsa.ToDerFile("dsa_priv.der");
    if (success != true) {
        strOut.append(dsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Load an encrypted PEM private key.
    pemPrivateKey = dsa.loadText("dsa_privEncrypted.pem");
    // Import the encrypted PEM into the DSA object.
    success = dsa.FromEncryptedPem("myPassword",pemPrivateKey);
    if (success != true) {
        strOut.append(dsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Write it out as an unencrypted DER file:
    success = dsa.ToDerFile("dsa_priv2.der");
    if (success != true) {
        strOut.append(dsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Finished!");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }