Unicode C

DSA Generate Key

See more DSA Examples

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-----

Unicode C

#include <C_CkDsaW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkDsaW dsa;
    const wchar_t *pemStr;
    const wchar_t *xmlStr;
    BOOL bPublicOnly;

    success = FALSE;

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

    dsa = CkDsaW_Create();

    // 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.
    success = CkDsaW_GenKey(dsa,2048);
    if (success != TRUE) {
        wprintf(L"%s\n",CkDsaW_lastErrorText(dsa));
        CkDsaW_Dispose(dsa);
        return;
    }

    // Extract the private and public parts to PEM or DER format
    // and save to files...

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

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

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

    bPublicOnly = TRUE;
    // Save to XML
    xmlStr = CkDsaW_toXml(dsa,bPublicOnly);
    success = CkDsaW_SaveText(dsa,xmlStr,L"dsa_pub.xml");

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

    // Unencrypted PEM:
    pemStr = CkDsaW_toPem(dsa);
    success = CkDsaW_SaveText(dsa,pemStr,L"dsa_priv.pem");

    // Encrypted PEM:
    pemStr = CkDsaW_toEncryptedPem(dsa,L"myPassword");
    success = CkDsaW_SaveText(dsa,pemStr,L"dsa_privEncrypted.pem");

    // DER:
    success = CkDsaW_ToDerFile(dsa,L"dsa_priv.der");

    // XML:
    bPublicOnly = FALSE;
    xmlStr = CkDsaW_toXml(dsa,bPublicOnly);
    success = CkDsaW_SaveText(dsa,xmlStr,L"dsa_priv.xml");

    wprintf(L"Finished!\n");


    CkDsaW_Dispose(dsa);

    }