Wrapper to use OpenPGP with Crypt_RSA
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Stephen Paul Weber
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lib/openpgp_crypt_rsa.php
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138
lib/openpgp_crypt_rsa.php
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<?php
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// This is free and unencumbered software released into the public domain.
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/**
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* OpenPGP_Crypt_RSA.php is a wrapper for using the classes from OpenPGP.php with Crypt_RSA
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*
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* @package OpenPGP
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* @version 0.0.1
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* @author Stephen Paul Weber <singpolyma@singpolyma.net>
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* @link http://github.com/singpolyma/openpgp-php
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*/
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// From http://phpseclib.sourceforge.net/
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require 'Crypt/RSA.php';
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class OpenPGP_Crypt_RSA {
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protected $key, $message;
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// Construct a wrapper object from a key or a message packet
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function __construct($packet) {
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if(!is_object($packet)) $packet = OpenPGP_Message::parse($packet);
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if($packet[0] instanceof OpenPGP_PublicKeyPacket) $packet = $packet[0];
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if($packet instanceof OpenPGP_PublicKeyPacket) { // If it's a key (other keys are subclasses of this one)
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$this->key = $packet;
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} else {
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$this->message = $packet;
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}
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}
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// Get Crypt_RSA for the public key
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function public_key() {
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if(!$this->key) return NULL; // No key
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return self::convert_public_key($this->key);
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}
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// Get Crypt_RSA for the private key
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function private_key() {
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if(!$this->key) return NULL; // No key
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return self::convert_private_key($this->key);
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}
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// Pass a message to verify with this key, or a key (OpenPGP or Crypt_RSA) to check this message with
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// Second optional parameter to specify which signature to verify (if there is more than one)
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function verify($packet, $index=0) {
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if(!is_object($packet)) $packet = OpenPGP_Message::parse($packet);
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if($packet[0] instanceof OpenPGP_PublicKeyPacket) $packet = $packet[0];
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if($packet instanceof OpenPGP_Message) {
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$key = $this->public_key();
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list($signature_packet, $data_packet) = $packet->signature_and_data($index);
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if(!$key || $signature_packet->key_algorithm_name() != 'RSA') return NULL;
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$key->setHash(strtolower($signature_packet->hash_algorithm_name()));
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return $packet->verify(array('RSA' => array($signature_packet->hash_algorithm_name() => array($key, 'verify'))));
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} else {
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list($signature_packet, $data_packet) = $this->message->signature_and_data($index);
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if(!$this->message || $signature_packet->key_algorithm_name() != 'RSA') return NULL;
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if(!($packet instanceof Crypt_RSA)) $packet = self::convert_public_key($packet);
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$packet->setHash(strtolower($signature_packet->hash_algorithm_name()));
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return $this->message->verify(array('RSA' => array($signature_packet->hash_algorithm_name() => array($packet, 'verify'))));
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}
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}
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// Pass a message to sign with this key, or a secret key to sign this message with
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// Second parameter is hash algorithm to use (default SHA256)
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// Third parameter is the 16-digit key ID to use... defaults to the key id in the key packet
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function sign($packet, $hash='SHA256', $key_id=NULL) {
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if(!is_object($packet)) {
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if($this->key) {
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$packet = new OpenPGP_LiteralDataPacket($packet);
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} else {
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$packet = OpenPGP_Message::parse($packet);
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$packet = $packet[0];
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}
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}
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if($packet instanceof OpenPGP_SecretKeyPacket || $packet instanceof Crypt_RSA) {
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$key = $packet;
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$message = $this->message;
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} else {
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$key = $this->private_key();
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$message = $packet;
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}
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if(!$key || !$message) return NULL; // Missing some data
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if($message instanceof OpenPGP_Message) {
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list($dummy, $message) = $message->signature_and_data();
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}
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if(!$key_id) $key_id = substr($key->fingerprint, -16, 16);
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if($key instanceof OpenPGP_SecretKeyPacket) $key = self::convert_private_key($key);
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$key->setHash(strtolower($hash));
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$sig = new OpenPGP_SignaturePacket($message, 'RSA', strtoupper($hash));
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$sig->hashed_subpackets[] = new OpenPGP_SignaturePacket_IssuerPacket($key_id);
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$sig->sign_data(array('RSA' => array($hash => array($key, 'sign'))));
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return new OpenPGP_Message(array($sig, $message));
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}
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static function crypt_rsa_key($mod, $exp, $hash='SHA256') {
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$rsa = new Crypt_RSA();
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$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
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$rsa->setHash(strtolower($hash));
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$rsa->modulus = new Math_BigInteger($mod, 256);
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$rsa->k = strlen($rsa->modulus->toBytes());
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$rsa->exponent = new Math_BigInteger($exp, 256);
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return $rsa;
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}
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static function convert_key($packet, $private=false) {
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if(!is_object($packet)) $packet = OpenPGP_Message::parse($packet);
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if($packet instanceof OpenPGP_Message) $packet = $packet[0];
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$mod = $packet->key['n'];
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$exp = $packet->key['e'];
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if($private) $exp = $packet->key['d'];
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if(!$exp) return NULL; // Packet doesn't have needed data
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$rsa = self::crypt_rsa_key($mod, $exp);
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if($private) {
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if($packet->key['p'] && $packet->key['q']) $rsa->primes = array($packet->key['p'], $packet->key['q']);
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if($packet->key['u']) $rsa->coefficients = array($packet->key['u']);
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}
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return $rsa;
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}
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static function convert_public_key($packet) {
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return self::convert_key($packet, false);
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}
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static function convert_private_key($packet) {
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return self::convert_key($packet, true);
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}
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}
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?>
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