418 lines
11 KiB
PHP
418 lines
11 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2022, the Friendica project
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Util;
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use Exception;
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use Friendica\Core\Hook;
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use Friendica\Core\Logger;
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use Friendica\Core\System;
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use Friendica\DI;
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use ParagonIE\ConstantTime\Base64UrlSafe;
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use phpseclib\Crypt\RSA;
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use phpseclib\Math\BigInteger;
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/**
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* Crypto class
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*/
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class Crypto
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{
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// supported algorithms are 'sha256', 'sha1'
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/**
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* @param string $data data
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* @param string $key key
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* @param string $alg algorithm
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* @return string
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*/
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public static function rsaSign($data, $key, $alg = 'sha256')
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{
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if (empty($key)) {
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Logger::warning('Empty key parameter', ['callstack' => System::callstack()]);
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}
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openssl_sign($data, $sig, $key, (($alg == 'sha1') ? OPENSSL_ALGO_SHA1 : $alg));
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return $sig;
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}
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/**
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* @param string $data data
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* @param string $sig signature
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* @param string $key key
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* @param string $alg algorithm
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* @return boolean
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*/
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public static function rsaVerify($data, $sig, $key, $alg = 'sha256')
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{
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if (empty($key)) {
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Logger::warning('Empty key parameter', ['callstack' => System::callstack()]);
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}
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return openssl_verify($data, $sig, $key, (($alg == 'sha1') ? OPENSSL_ALGO_SHA1 : $alg));
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}
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/**
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/**
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* @param string $m modulo
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* @param string $e exponent
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* @return string
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*/
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public static function meToPem($m, $e)
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{
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$rsa = new RSA();
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$rsa->loadKey([
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'e' => new BigInteger($e, 256),
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'n' => new BigInteger($m, 256)
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]);
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return $rsa->getPublicKey();
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}
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/**
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* Transform RSA public keys to standard PEM output
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*
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* @param string $key A RSA public key
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*
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* @return string The PEM output of this key
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*/
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public static function rsaToPem(string $key)
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{
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$rsa = new RSA();
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$rsa->setPublicKey($key);
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return $rsa->getPublicKey(RSA::PUBLIC_FORMAT_PKCS8);
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}
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/**
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* Extracts the modulo and exponent reference from a public PEM key
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*
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* @param string $key public PEM key
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* @param string $modulus (ref) modulo reference
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* @param string $exponent (ref) exponent reference
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*
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* @return void
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*/
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public static function pemToMe(string $key, &$modulus, &$exponent)
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{
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$rsa = new RSA();
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$rsa->loadKey($key);
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$rsa->setPublicKey();
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$modulus = $rsa->modulus->toBytes();
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$exponent = $rsa->exponent->toBytes();
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}
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/**
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* @param integer $bits number of bits
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* @return mixed
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function newKeypair($bits)
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{
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$openssl_options = [
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'digest_alg' => 'sha1',
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'private_key_bits' => $bits,
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'encrypt_key' => false
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];
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$conf = DI::config()->get('system', 'openssl_conf_file');
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if ($conf) {
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$openssl_options['config'] = $conf;
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}
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$result = openssl_pkey_new($openssl_options);
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if (empty($result)) {
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Logger::notice('new_keypair: failed');
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return false;
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}
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// Get private key
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$response = ['prvkey' => '', 'pubkey' => ''];
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openssl_pkey_export($result, $response['prvkey']);
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// Get public key
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$pkey = openssl_pkey_get_details($result);
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$response['pubkey'] = $pkey["key"];
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return $response;
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}
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/**
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* Create a new elliptic curve key pair
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*
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* @return array with the elements "prvkey", "pubkey", "vapid-public" and "vapid-private"
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*/
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public static function newECKeypair()
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{
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$openssl_options = [
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'curve_name' => 'prime256v1',
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'private_key_type' => OPENSSL_KEYTYPE_EC
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];
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$conf = DI::config()->get('system', 'openssl_conf_file');
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if ($conf) {
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$openssl_options['config'] = $conf;
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}
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$result = openssl_pkey_new($openssl_options);
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if (empty($result)) {
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throw new Exception('Key creation failed');
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}
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$response = ['prvkey' => '', 'pubkey' => ''];
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// Get private key
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openssl_pkey_export($result, $response['prvkey']);
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// Get public key
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$pkey = openssl_pkey_get_details($result);
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$response['pubkey'] = $pkey['key'];
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// Create VAPID keys
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// @see https://github.com/web-push-libs/web-push-php/blob/256a18b2a2411469c94943725fb6eccb9681bd75/src/Utils.php#L60-L62
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$hexString = '04';
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$hexString .= str_pad(bin2hex($pkey['ec']['x']), 64, '0', STR_PAD_LEFT);
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$hexString .= str_pad(bin2hex($pkey['ec']['y']), 64, '0', STR_PAD_LEFT);
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$response['vapid-public'] = Base64UrlSafe::encode(hex2bin($hexString));
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// @see https://github.com/web-push-libs/web-push-php/blob/256a18b2a2411469c94943725fb6eccb9681bd75/src/VAPID.php
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$response['vapid-private'] = Base64UrlSafe::encode(hex2bin(str_pad(bin2hex($pkey['ec']['d']), 64, '0', STR_PAD_LEFT)));
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return $response;
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}
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/**
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* Encrypt a string with 'aes-256-cbc' cipher method.
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $key The key used for encryption.
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* @param string $iv A non-NULL Initialization Vector.
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*
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* @return string|boolean Encrypted string or false on failure.
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*/
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private static function encryptAES256CBC($data, $key, $iv)
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{
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return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
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}
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/**
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* Decrypt a string with 'aes-256-cbc' cipher method.
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $key The key used for decryption.
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* @param string $iv A non-NULL Initialization Vector.
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*
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* @return string|boolean Decrypted string or false on failure.
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*/
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private static function decryptAES256CBC($data, $key, $iv)
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{
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return openssl_decrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $pubkey The public key.
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* @param string $alg The algorithm used for encryption.
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*
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* @return array
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* @throws \Exception
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*/
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public static function encapsulate($data, $pubkey, $alg = 'aes256cbc')
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{
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if ($alg === 'aes256cbc') {
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return self::encapsulateAes($data, $pubkey);
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}
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return self::encapsulateOther($data, $pubkey, $alg);
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $pubkey The public key.
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* @param string $alg The algorithm used for encryption.
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*
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* @return array
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* @throws \Exception
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*/
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private static function encapsulateOther($data, $pubkey, $alg)
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{
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if (!$pubkey) {
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Logger::notice('no key. data: '.$data);
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}
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$fn = 'encrypt' . strtoupper($alg);
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if (method_exists(__CLASS__, $fn)) {
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$result = ['encrypted' => true];
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$key = random_bytes(256);
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$iv = random_bytes(256);
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$result['data'] = Strings::base64UrlEncode(self::$fn($data, $key, $iv), true);
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// log the offending call so we can track it down
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if (!openssl_public_encrypt($key, $k, $pubkey)) {
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$x = debug_backtrace();
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Logger::notice('RSA failed', ['trace' => $x[0]]);
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}
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$result['alg'] = $alg;
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$result['key'] = Strings::base64UrlEncode($k, true);
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openssl_public_encrypt($iv, $i, $pubkey);
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$result['iv'] = Strings::base64UrlEncode($i, true);
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return $result;
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} else {
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$x = ['data' => $data, 'pubkey' => $pubkey, 'alg' => $alg, 'result' => $data];
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Hook::callAll('other_encapsulate', $x);
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return $x['result'];
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}
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param string $data
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* @param string $pubkey
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*
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* @return array
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* @throws \Exception
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*/
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private static function encapsulateAes($data, $pubkey)
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{
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if (!$pubkey) {
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Logger::notice('aes_encapsulate: no key. data: ' . $data);
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}
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$key = random_bytes(32);
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$iv = random_bytes(16);
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$result = ['encrypted' => true];
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$result['data'] = Strings::base64UrlEncode(self::encryptAES256CBC($data, $key, $iv), true);
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// log the offending call so we can track it down
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if (!openssl_public_encrypt($key, $k, $pubkey)) {
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$x = debug_backtrace();
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Logger::notice('aes_encapsulate: RSA failed.', ['data' => $x[0]]);
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}
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$result['alg'] = 'aes256cbc';
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$result['key'] = Strings::base64UrlEncode($k, true);
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openssl_public_encrypt($iv, $i, $pubkey);
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$result['iv'] = Strings::base64UrlEncode($i, true);
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return $result;
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param array $data ['iv' => $iv, 'key' => $key, 'alg' => $alg, 'data' => $data]
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* @param string $prvkey The private key used for decryption.
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*
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* @return string|boolean The decrypted string or false on failure.
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* @throws \Exception
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*/
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public static function unencapsulate(array $data, $prvkey)
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{
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if (!$data) {
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return;
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}
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$alg = $data['alg'] ?? 'aes256cbc';
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if ($alg === 'aes256cbc') {
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return self::unencapsulateAes($data['data'], $prvkey);
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}
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return self::unencapsulateOther($data, $prvkey, $alg);
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param array $data
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* @param string $prvkey The private key used for decryption.
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* @param string $alg
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*
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* @return string|boolean The decrypted string or false on failure.
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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private static function unencapsulateOther(array $data, $prvkey, $alg)
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{
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$fn = 'decrypt' . strtoupper($alg);
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if (method_exists(__CLASS__, $fn)) {
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openssl_private_decrypt(Strings::base64UrlDecode($data['key']), $k, $prvkey);
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openssl_private_decrypt(Strings::base64UrlDecode($data['iv']), $i, $prvkey);
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return self::$fn(Strings::base64UrlDecode($data['data']), $k, $i);
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} else {
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$x = ['data' => $data, 'prvkey' => $prvkey, 'alg' => $alg, 'result' => $data];
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Hook::callAll('other_unencapsulate', $x);
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return $x['result'];
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}
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}
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/**
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/include/crypto.php
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*
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* @param array $data
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* @param string $prvkey The private key used for decryption.
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*
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* @return string|boolean The decrypted string or false on failure.
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* @throws \Exception
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*/
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private static function unencapsulateAes($data, $prvkey)
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{
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openssl_private_decrypt(Strings::base64UrlDecode($data['key']), $k, $prvkey);
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openssl_private_decrypt(Strings::base64UrlDecode($data['iv']), $i, $prvkey);
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return self::decryptAES256CBC(Strings::base64UrlDecode($data['data']), $k, $i);
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}
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/**
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* Creates cryptographic secure random digits
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*
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* @param string $digits The count of digits
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* @return int The random Digits
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*
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* @throws \Exception In case 'random_int' isn't usable
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*/
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public static function randomDigits($digits)
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{
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$rn = '';
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// generating cryptographically secure pseudo-random integers
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for ($i = 0; $i < $digits; $i++) {
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$rn .= random_int(0, 9);
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}
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return $rn;
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}
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}
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