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Filename : DataSigner.php
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<?php

/*
 * This file is part of the Acme PHP project.
 *
 * (c) Titouan Galopin <galopintitouan@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PleskLetsEncrypt\AcmePhp\Ssl\Signer;

use PleskLetsEncrypt\AcmePhp\Ssl\Exception\DataSigningException;
use PleskLetsEncrypt\AcmePhp\Ssl\PrivateKey;
use PleskLetsEncrypt\Webmozart\Assert\Assert;
/**
 * Provide tools to sign data using a private key.
 *
 * @author Titouan Galopin <galopintitouan@gmail.com>
 */
class DataSigner
{
    public const FORMAT_DER = 'DER';
    public const FORMAT_ECDSA = 'ECDSA';
    /**
     * Generate a signature of the given data using a private key and an algorithm.
     *
     * @param string     $data       Data to sign
     * @param PrivateKey $privateKey Key used to sign
     * @param int        $algorithm  Signature algorithm defined by constants OPENSSL_ALGO_*
     * @param string     $format     Format of the output
     */
    public function signData(string $data, PrivateKey $privateKey, int $algorithm = \OPENSSL_ALGO_SHA256, string $format = self::FORMAT_DER) : string
    {
        Assert::oneOf($format, [self::FORMAT_ECDSA, self::FORMAT_DER], 'The format %s to sign request does not exists. Available format: %s');
        $resource = $privateKey->getResource();
        if (!\openssl_sign($data, $signature, $resource, $algorithm)) {
            throw new DataSigningException(\sprintf('OpenSSL data signing failed with error: %s', \openssl_error_string()));
        }
        // PHP 8 automatically frees the key instance and deprecates the function
        if (\PHP_VERSION_ID < 80000) {
            \openssl_free_key($resource);
        }
        switch ($format) {
            case self::FORMAT_DER:
                return $signature;
            case self::FORMAT_ECDSA:
                switch ($algorithm) {
                    case \OPENSSL_ALGO_SHA256:
                        return $this->DERtoECDSA($signature, 64);
                    case \OPENSSL_ALGO_SHA384:
                        return $this->DERtoECDSA($signature, 96);
                    case \OPENSSL_ALGO_SHA512:
                        return $this->DERtoECDSA($signature, 132);
                }
                throw new DataSigningException('Unable to generate a ECDSA signature with the given algorithm');
            default:
                throw new DataSigningException('The given format does exists');
        }
    }
    /**
     * Convert a DER signature into ECDSA.
     *
     * The code is a copy/paste from another lib (web-token/jwt-core) which is not compatible with php <= 7.0
     *
     * @see https://github.com/web-token/jwt-core/blob/master/Util/ECSignature.php
     */
    private function DERtoECDSA($der, $partLength) : string
    {
        $hex = \unpack('H*', $der)[1];
        if ('30' !== \mb_substr($hex, 0, 2, '8bit')) {
            // SEQUENCE
            throw new DataSigningException('Invalid signature provided');
        }
        if ('81' === \mb_substr($hex, 2, 2, '8bit')) {
            // LENGTH > 128
            $hex = \mb_substr($hex, 6, null, '8bit');
        } else {
            $hex = \mb_substr($hex, 4, null, '8bit');
        }
        if ('02' !== \mb_substr($hex, 0, 2, '8bit')) {
            // INTEGER
            throw new DataSigningException('Invalid signature provided');
        }
        $Rl = \hexdec(\mb_substr($hex, 2, 2, '8bit'));
        $R = $this->retrievePositiveInteger(\mb_substr($hex, 4, $Rl * 2, '8bit'));
        $R = \str_pad($R, $partLength, '0', \STR_PAD_LEFT);
        $hex = \mb_substr($hex, 4 + $Rl * 2, null, '8bit');
        if ('02' !== \mb_substr($hex, 0, 2, '8bit')) {
            // INTEGER
            throw new DataSigningException('Invalid signature provided');
        }
        $Sl = \hexdec(\mb_substr($hex, 2, 2, '8bit'));
        $S = $this->retrievePositiveInteger(\mb_substr($hex, 4, $Sl * 2, '8bit'));
        $S = \str_pad($S, $partLength, '0', \STR_PAD_LEFT);
        return \pack('H*', $R . $S);
    }
    /**
     * The code is a copy/paste from another lib (web-token/jwt-core) which is not compatible with php <= 7.0.
     *
     * @see https://github.com/web-token/jwt-core/blob/master/Util/ECSignature.php
     */
    private function retrievePositiveInteger($data)
    {
        while ('00' === \mb_substr($data, 0, 2, '8bit') && \mb_substr($data, 2, 2, '8bit') > '7f') {
            $data = \mb_substr($data, 2, null, '8bit');
        }
        return $data;
    }
}