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<?php |
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/** |
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* Copyright (c) 2020 UMI |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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declare(strict_types=1); |
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namespace UmiTop\UmiCore\Key\Ed25519; |
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use Exception; |
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use UmiTop\UmiCore\Key\PublicKeyInterface; |
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use UmiTop\UmiCore\Key\SecretKeyInterface; |
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use UmiTop\UmiCore\Util\Ed25519\Ed25519; |
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/** |
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* Класс для работы с приватными ключами. |
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* @package UmiTop\UmiCore\Key\Ed25519 |
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*/ |
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class SecretKey implements SecretKeyInterface |
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{ |
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/** @var int Длина приватного ключа в байтах. */ |
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public const LENGTH = 64; |
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/** @var string Приватный ключ в бинарном виде. */ |
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private $bytes; |
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/** |
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* SecretKey constructor. |
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* @param string $bytes Приватный ключ в бинарном виде. В формате libsodium, 64 байта. |
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* @throws Exception |
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*/ |
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public function __construct(string $bytes) |
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{ |
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if (strlen($bytes) !== self::LENGTH) { |
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throw new Exception('secret key size should be 64 bytes'); |
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} |
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$this->bytes = $bytes; |
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} |
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/** |
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* Статический метод, создающий приватный ключ из seed. |
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* Libsodium принимает seed длиной 32 байта, поэтому если длина отличается, то берется sha256 хэш. |
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* @param string $seed Бинарная строка любой длины. |
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* @return SecretKeyInterface |
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* @codeCoverageIgnore |
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*/ |
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public static function fromSeed(string $seed): SecretKeyInterface |
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{ |
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if (strlen($seed) !== Ed25519::SEED_BYTES) { |
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$seed = hash('sha256', $seed, true); |
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} |
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if (function_exists('sodium_crypto_sign_seed_keypair') === true) { |
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$bytes = sodium_crypto_sign_secretkey( |
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sodium_crypto_sign_seed_keypair($seed) |
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); |
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return new SecretKey($bytes); |
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} |
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$ed25519 = new Ed25519(); |
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$bytes = $ed25519->secretKeyFromSeed($seed); |
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return new SecretKey($bytes); |
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} |
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/** |
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* Приватный ключ в бинарном виде. В формате libsodium, 64 байта. |
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* @return string |
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*/ |
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public function getBytes(): string |
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{ |
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return $this->bytes; |
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} |
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/** |
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* Публичный ключ, соответствующий приватному ключу. |
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* @return PublicKeyInterface |
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*/ |
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public function getPublicKey(): PublicKeyInterface |
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{ |
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return new PublicKey(substr($this->bytes, 32, 32)); |
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} |
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/** |
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* Создает цифровую подпись сообщения. |
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* @param string $message Сообщение в бинарном виде. |
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* @return string |
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* @codeCoverageIgnore |
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*/ |
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public function sign(string $message): string |
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{ |
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if (function_exists('sodium_crypto_sign_detached') === true) { |
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return sodium_crypto_sign_detached($message, $this->bytes); |
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} |
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$ed25519 = new Ed25519(); |
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return $ed25519->sign($message, $this->bytes); |
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} |
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} |
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umi-top /
umi-core-php
