(MFC) DSA Generate Key

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

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;

    // Call GenKey to generate a new DSA key.
    // The number of bits should be at least 1024 and a multiple
    // of 64.   Typical values are either 1024 or 2048.
    // DSA key generation is compute intensive and may take
    // a short while to complete.
    bool success = dsa.GenKey(2048);
    if (success != true) {
        strOut.append(dsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Extract the private and public parts to PEM or DER format
    // and save to files...
    const char *pemStr = 0;
    const char *xmlStr = 0;

    // First for the public key...
    // The public key never needs to be encrypted.

    // Save the public key in PEM format:
    pemStr = dsa.toPublicPem();
    // This example will not check the return value of SaveText...
    success = dsa.SaveText(pemStr,"dsa_pub.pem");

    // Save the public key in DER format:
    success = dsa.ToPublicDerFile("dsa_pub.der");

    bool bPublicOnly = true;
    // Save to XML
    xmlStr = dsa.toXml(bPublicOnly);
    success = dsa.SaveText(xmlStr,"dsa_pub.xml");

    // ------------------------------------
    // Now for the private key....
    // ------------------------------------

    // Unencrypted PEM:
    pemStr = dsa.toPem();
    success = dsa.SaveText(pemStr,"dsa_priv.pem");

    // Encrypted PEM:
    pemStr = dsa.toEncryptedPem("myPassword");
    success = dsa.SaveText(pemStr,"dsa_privEncrypted.pem");

    // DER:
    success = dsa.ToDerFile("dsa_priv.der");

    // XML:
    bPublicOnly = false;
    xmlStr = dsa.toXml(bPublicOnly);
    success = dsa.SaveText(xmlStr,"dsa_priv.xml");

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


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }