PHP ActiveX

Load a Public Key from Base64 DER

Demonstrates the Chilkat PublicKey.LoadBase64 method, which loads a public key from standard Base64-encoded DER. The only argument is the Base64 string; whitespace within it is permitted.

Background: A public key in DER (binary) form is often carried as Base64 text so it can travel through channels that expect a string — a config value, a JSON field, a certificate export. This loader decodes that text and inspects the DER to determine the key type and structure automatically. It is the plain-Base64 counterpart to loading a full PEM block, which additionally has the BEGIN/END armor.

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<?php

$success = 0;

//  Demonstrates the PublicKey.LoadBase64 method, which loads a public key from standard
//  Base64-encoded DER.  The only argument is the Base64 string (whitespace is allowed).

$pubKey = new COM("Chilkat.PublicKey");

//  The Base64 of the DER-encoded public key.
$keyStr = 'MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA...IDAQAB';

$success = $pubKey->LoadBase64($keyStr);
if ($success == 0) {
    print $pubKey->LastErrorText . "\n";
    exit;
}

print 'Loaded a ' . $pubKey->KeyType . ' public key.' . "\n";

?>