PHP ActiveX

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-----

PHP ActiveX

<?php

$success = 0;

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

$dsa = new COM("Chilkat.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.
$success = $dsa->GenKey(2048);
if ($success != 1) {
    print $dsa->LastErrorText . "\n";
    exit;
}

// 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 = $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');

$bPublicOnly = 1;
// 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 = 0;
$xmlStr = $dsa->toXml($bPublicOnly);
$success = $dsa->SaveText($xmlStr,'dsa_priv.xml');

print 'Finished!' . "\n";

?>