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<?php declare(strict_types=1); /* * The MIT License (MIT) * * Copyright (c) 2014-2018 Spomky-Labs * * This software may be modified and distributed under the terms * of the MIT license. See the LICENSE file for details. * * @link https://github.com/web-token/jwt-framework/blob/v1.2/src/Component/Core/Util/ECSignature.php / namespace Lcobucci\JWT\Signer\Ecdsa; use function assert; use function bin2hex; use function dechex; use function hex2bin; use function hexdec; use function is_string; use function str_pad; use function strlen; use function substr; use const STR_PAD_LEFT; /* * ECDSA signature converter using ext-mbstring * * @internal / final class MultibyteStringConverter implements SignatureConverter { private const ASN1_SEQUENCE = '30'; private const ASN1_INTEGER = '02'; private const ASN1_MAX_SINGLE_BYTE = 128; private const ASN1_LENGTH_2BYTES = '81'; private const ASN1_BIG_INTEGER_LIMIT = '7f'; private const ASN1_NEGATIVE_INTEGER = '00'; private const BYTE_SIZE = 2; public function toAsn1(string $points, int $length): string { $points = bin2hex($points); if (self::octetLength($points) !== $length) { throw ConversionFailed::invalidLength(); } $pointR = self::preparePositiveInteger(substr($points, 0, $length)); $pointS = self::preparePositiveInteger(substr($points, $length, null)); $lengthR = self::octetLength($pointR); $lengthS = self::octetLength($pointS); $totalLength = $lengthR + $lengthS + self::BYTE_SIZE + self::BYTE_SIZE; $lengthPrefix = $totalLength > self::ASN1_MAX_SINGLE_BYTE ? self::ASN1_LENGTH_2BYTES : ''; $asn1 = hex2bin( self::ASN1_SEQUENCE . $lengthPrefix . dechex($totalLength) . self::ASN1_INTEGER . dechex($lengthR) . $pointR . self::ASN1_INTEGER . dechex($lengthS) . $pointS, ); assert(is_string($asn1)); assert($asn1 !== ''); return $asn1; } private static function octetLength(string $data): int { return (int) (strlen($data) / self::BYTE_SIZE); } private static function preparePositiveInteger(string $data): string { if (substr($data, 0, self::BYTE_SIZE) > self::ASN1_BIG_INTEGER_LIMIT) { return self::ASN1_NEGATIVE_INTEGER . $data; } while ( substr($data, 0, self::BYTE_SIZE) === self::ASN1_NEGATIVE_INTEGER && substr($data, 2, self::BYTE_SIZE) <= self::ASN1_BIG_INTEGER_LIMIT ) { $data = substr($data, 2, null); } return $data; } public function fromAsn1(string $signature, int $length): string { $message = bin2hex($signature); $position = 0; if (self::readAsn1Content($message, $position, self::BYTE_SIZE) !== self::ASN1_SEQUENCE) { throw ConversionFailed::incorrectStartSequence(); } // @phpstan-ignore-next-line if (self::readAsn1Content($message, $position, self::BYTE_SIZE) === self::ASN1_LENGTH_2BYTES) { $position += self::BYTE_SIZE; } $pointR = self::retrievePositiveInteger(self::readAsn1Integer($message, $position)); $pointS = self::retrievePositiveInteger(self::readAsn1Integer($message, $position)); $points = hex2bin(str_pad($pointR, $length, '0', STR_PAD_LEFT) . str_pad($pointS, $length, '0', STR_PAD_LEFT)); assert(is_string($points)); assert($points !== ''); return $points; } private static function readAsn1Content(string $message, int &$position, int $length): string { $content = substr($message, $position, $length); $position += $length; return $content; } private static function readAsn1Integer(string $message, int &$position): string { if (self::readAsn1Content($message, $position, self::BYTE_SIZE) !== self::ASN1_INTEGER) { throw ConversionFailed::integerExpected(); } $length = (int) hexdec(self::readAsn1Content($message, $position, self::BYTE_SIZE)); return self::readAsn1Content($message, $position, $length self::BYTE_SIZE); } private static function retrievePositiveInteger(string $data): string { while ( substr($data, 0, self::BYTE_SIZE) === self::ASN1_NEGATIVE_INTEGER && substr($data, 2, self::BYTE_SIZE) > self::ASN1_BIG_INTEGER_LIMIT ) { $data = substr($data, 2, null); } return $data; } }

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