281 lines
9.1 KiB
PHP
281 lines
9.1 KiB
PHP
<?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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*/
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// From http://phpseclib.sourceforge.net/
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use phpseclib\Crypt\RSA as Crypt_RSA;
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use phpseclib\Math\BigInteger as Math_BigInteger;
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define('CRYPT_RSA_ENCRYPTION_PKCS1', Crypt_RSA::ENCRYPTION_PKCS1);
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define('CRYPT_RSA_SIGNATURE_PKCS1', Crypt_RSA::SIGNATURE_PKCS1);
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require_once dirname(__FILE__).'/openpgp.php';
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@include_once dirname(__FILE__).'/openpgp_crypt_symmetric.php'; /* For encrypt/decrypt */
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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 instanceof OpenPGP_PublicKeyPacket || $packet[0] instanceof OpenPGP_PublicKeyPacket) { // If it's a key (other keys are subclasses of this one)
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$this->key = $packet;
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} else {
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$this->message = $packet;
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}
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}
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function key($keyid=NULL) {
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if(!$this->key) return NULL; // No key
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if($this->key instanceof OpenPGP_Message) {
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foreach($this->key as $p) {
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if($p instanceof OpenPGP_PublicKeyPacket) {
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if(!$keyid || strtoupper(substr($p->fingerprint, strlen($keyid)*-1)) == strtoupper($keyid)) return $p;
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}
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}
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}
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return $this->key;
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}
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// Get Crypt_RSA for the public key
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function public_key($keyid=NULL) {
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return self::convert_public_key($this->key($keyid));
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}
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// Get Crypt_RSA for the private key
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function private_key($keyid=NULL) {
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return self::convert_private_key($this->key($keyid));
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}
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// Pass a message to verify with this key, or a key (OpenPGP or Crypt_RSA) to check this message with
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// Second optional parameter to specify which signature to verify (if there is more than one)
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function verify($packet) {
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$self = $this; // For old PHP
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if(!is_object($packet)) $packet = OpenPGP_Message::parse($packet);
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if(!$this->message) {
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$m = $packet;
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$verifier = function($m, $s) use($self) {
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$key = $self->public_key($s->issuer());
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if(!$key) return false;
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$key->setHash(strtolower($s->hash_algorithm_name()));
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return $key->verify($m, reset($s->data));
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};
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} else {
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if(!($packet instanceof Crypt_RSA)) {
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$packet = new self($packet);
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}
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$m = $this->message;
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$verifier = function($m, $s) use($self, $packet) {
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if(!($packet instanceof Crypt_RSA)) {
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$key = $packet->public_key($s->issuer());
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}
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if(!$key) return false;
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$key->setHash(strtolower($s->hash_algorithm_name()));
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return $key->verify($m, reset($s->data));
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};
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}
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return $m->verified_signatures(array('RSA' => array(
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'MD5' => $verifier,
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'SHA1' => $verifier,
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'SHA224' => $verifier,
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'SHA256' => $verifier,
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'SHA384' => $verifier,
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'SHA512' => $verifier
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)));
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}
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// Pass a message to sign with this key, or a secret key to sign this message with
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// Second parameter is hash algorithm to use (default SHA256)
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// Third parameter is the 16-digit key ID to use... defaults to the key id in the key packet
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function sign($packet, $hash='SHA256', $keyid=NULL) {
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if(!is_object($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($packet);
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}
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}
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if($packet instanceof OpenPGP_SecretKeyPacket || $packet instanceof Crypt_RSA
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|| ($packet instanceof ArrayAccess && $packet[0] instanceof OpenPGP_SecretKeyPacket)) {
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$key = $packet;
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$message = $this->message;
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} else {
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$key = $this->key;
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$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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$sign = $message->signatures();
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$message = $sign[0][0];
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}
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if(!($key instanceof Crypt_RSA)) {
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$key = new self($key);
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if(!$keyid) $keyid = substr($key->key()->fingerprint, -16, 16);
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$key = $key->private_key($keyid);
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}
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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($keyid);
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$sig->sign_data(array('RSA' => array($hash => function($data) use($key) {return array($key->sign($data));})));
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return new OpenPGP_Message(array($sig, $message));
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}
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/** Pass a message with a key and userid packet to sign */
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// TODO: merge this with the normal sign function
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function sign_key_userid($packet, $hash='SHA256', $keyid=NULL) {
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if(is_array($packet)) {
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$packet = new OpenPGP_Message($packet);
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} else if(!is_object($packet)) {
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$packet = OpenPGP_Message::parse($packet);
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}
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$key = $this->private_key($keyid);
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if(!$key || !$packet) return NULL; // Missing some data
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if(!$keyid) $keyid = substr($this->key->fingerprint, -16);
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$key->setHash(strtolower($hash));
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$sig = NULL;
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foreach($packet as $p) {
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if($p instanceof OpenPGP_SignaturePacket) $sig = $p;
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}
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if(!$sig) {
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$sig = new OpenPGP_SignaturePacket($packet, 'RSA', strtoupper($hash));
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$sig->signature_type = 0x13;
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$sig->hashed_subpackets[] = new OpenPGP_SignaturePacket_KeyFlagsPacket(array(0x01 | 0x02));
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$sig->hashed_subpackets[] = new OpenPGP_SignaturePacket_IssuerPacket($keyid);
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$packet[] = $sig;
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}
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$sig->sign_data(array('RSA' => array($hash => function($data) use($key) {return array($key->sign($data));})));
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return $packet;
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}
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function decrypt($packet) {
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if(!is_object($packet)) $packet = OpenPGP_Message::parse($packet);
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if($packet instanceof OpenPGP_SecretKeyPacket || $packet instanceof Crypt_RSA
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|| ($packet instanceof ArrayAccess && $packet[0] instanceof OpenPGP_SecretKeyPacket)) {
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$keys = $packet;
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$message = $this->message;
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} else {
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$keys = $this->key;
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$message = $packet;
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}
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if(!$keys || !$message) return NULL; // Missing some data
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if(!($keys instanceof Crypt_RSA)) {
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$keys = new self($keys);
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}
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$session_key = NULL;
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foreach($message as $p) {
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if($p instanceof OpenPGP_AsymmetricSessionKeyPacket) {
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$session_key = $p;
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if($keys instanceof Crypt_RSA) {
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$sk = self::try_decrypt_session($keys, substr($p->encrypted_data, 2));
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} else if(strlen(str_replace('0', '', $p->keyid)) < 1) {
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foreach($keys->key as $k) {
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$sk = self::try_decrypt_session(self::convert_private_key($k), substr($p->encrypted_data, 2));
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if($sk) break;
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}
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} else {
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$key = $keys->private_key($p->keyid);
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$sk = self::try_decrypt_session($key, substr($p->encrypted_data, 2));
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}
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if(!$sk) continue;
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$r = OpenPGP_Crypt_Symmetric::decryptPacket(OpenPGP_Crypt_Symmetric::getEncryptedData($message), $sk[0], $sk[1]);
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if($r) return $r;
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}
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}
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if (!$session_key) throw new Exception("Not an asymmetrically encrypted message");
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return NULL; /* Failed */
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}
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static function try_decrypt_session($key, $edata) {
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$key->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);
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$data = @$key->decrypt($edata);
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if(!$data) return NULL;
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$sk = substr($data, 1, strlen($data)-3);
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$chk = unpack('n', substr($data, -2));
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$chk = reset($chk);
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$sk_chk = 0;
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for($i = 0; $i < strlen($sk); $i++) {
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$sk_chk = ($sk_chk + ord($sk[$i])) % 65536;
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}
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if($sk_chk != $chk) return NULL;
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return array(ord($data[0]), $sk);
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}
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static function crypt_rsa_key($mod, $exp, $hash='SHA256') {
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$rsa = new Crypt_RSA();
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$rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
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$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($exp, 256);
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$rsa->setPublicKey();
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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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/**
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* @see https://github.com/phpseclib/phpseclib/issues/1113
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* Primes and coefficients now use BigIntegers.
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**/
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//set the primes
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if($packet->key['p'] && $packet->key['q'])
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$rsa->primes = array(
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1 => new Math_BigInteger($packet->key['p'], 256),
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2 => new Math_BigInteger($packet->key['q'], 256)
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);
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// set the coefficients
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if($packet->key['u']) $rsa->coefficients = array(2 => new Math_BigInteger($packet->key['u'], 256));
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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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