PHP

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

use Chilkat2\PublicKey;

// 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 PublicKey();

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

try {
    $pubKey->LoadBase64($keyStr);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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