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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2017 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Component\Core\Util; |
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/** |
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* Class ECSignature. |
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*/ |
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final class ECSignature |
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{ |
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/** |
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* @param string $signature |
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* @param int $partLength |
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* |
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* @return string |
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*/ |
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public static function toDER(string $signature, int $partLength): string |
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{ |
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$signature = unpack('H*', $signature)[1]; |
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if (mb_strlen($signature, '8bit') !== 2 * $partLength) { |
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throw new \InvalidArgumentException('Invalid length.'); |
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} |
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$R = mb_substr($signature, 0, $partLength, '8bit'); |
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$S = mb_substr($signature, $partLength, null, '8bit'); |
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$R = self::preparePositiveInteger($R); |
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$Rl = mb_strlen($R, '8bit')/2; |
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$S = self::preparePositiveInteger($S); |
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$Sl = mb_strlen($S, '8bit')/2; |
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$der = pack('H*', |
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'30'. ($Rl+$Sl+4 > 128 ? '81' : '').dechex($Rl+$Sl+4) |
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.'02'.dechex($Rl).$R |
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.'02'.dechex($Sl).$S |
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); |
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return $der; |
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} |
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/** |
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* @param string $der |
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* @param int $partLength |
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* |
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* @return string |
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*/ |
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public static function fromDER(string $der, int $partLength): string |
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{ |
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$hex = unpack('H*', $der)[1]; |
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if ('30' !== mb_substr($hex, 0, 2, '8bit')) { // SEQUENCE |
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throw new \RuntimeException(); |
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} |
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if ('81' === mb_substr($hex, 2, 2, '8bit')) { // LENGTH > 128 |
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$hex = mb_substr($hex, 6, null, '8bit'); |
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} else { |
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$hex = mb_substr($hex, 4, null, '8bit'); |
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} |
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if ('02' !== mb_substr($hex, 0, 2, '8bit')) { // INTEGER |
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throw new \RuntimeException(); |
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} |
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$Rl = hexdec(mb_substr($hex, 2, 2, '8bit')); |
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$R = self::retrievePositiveInteger(mb_substr($hex, 4, $Rl*2, '8bit')); |
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$R = str_pad($R, $partLength, '0', STR_PAD_LEFT); |
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$hex = mb_substr($hex, 4+$Rl*2, null, '8bit'); |
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if ('02' !== mb_substr($hex, 0, 2, '8bit')) { // INTEGER |
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throw new \RuntimeException(); |
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} |
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$Sl = hexdec(mb_substr($hex, 2, 2, '8bit')); |
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$S = self::retrievePositiveInteger(mb_substr($hex, 4, $Sl*2, '8bit')); |
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$S = str_pad($S, $partLength, '0', STR_PAD_LEFT); |
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return pack('H*', $R.$S); |
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} |
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/** |
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* @param string $data |
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* |
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* @return string |
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*/ |
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private static function preparePositiveInteger(string $data): string |
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{ |
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if (mb_substr($data, 0, 2, '8bit') >= '7f') { |
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return '00'.$data; |
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} |
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while ('00' === mb_substr($data, 0, 2, '8bit') && mb_substr($data, 2, 2, '8bit') < '7f') { |
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$data = mb_substr($data, 2, null, '8bit'); |
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} |
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return $data; |
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} |
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/** |
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* @param string $data |
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* |
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* @return string |
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*/ |
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private static function retrievePositiveInteger(string $data): string |
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{ |
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while ('00' === mb_substr($data, 0, 2, '8bit') && mb_substr($data, 2, 2, '8bit') > '7f') { |
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$data = mb_substr($data, 2, null, '8bit'); |
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} |
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return $data; |
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} |
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} |
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Spomky-Labs /
jose
