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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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use Jose\Component\Core\JWK; |
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final class KeyChecker |
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{ |
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/** |
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* @param JWK $key |
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* @param string $usage |
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* |
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* @throws \InvalidArgumentException |
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* |
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* @return bool |
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*/ |
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public static function checkKeyUsage(JWK $key, string $usage): bool |
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{ |
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if ($key->has('use')) { |
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return self::checkUsage($key, $usage); |
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} |
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if ($key->has('key_ops')) { |
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return self::checkOperation($key, $usage); |
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} |
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return true; |
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} |
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/** |
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* @param JWK $key |
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* @param string $usage |
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* |
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* @return bool |
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*/ |
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private static function checkOperation(JWK $key, string $usage): bool |
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{ |
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$ops = $key->get('key_ops'); |
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if (!is_array($ops)) { |
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$ops = [$ops]; |
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} |
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switch ($usage) { |
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case 'verification': |
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if (!in_array('verify', $ops)) { |
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throw new \InvalidArgumentException('Key cannot be used to verify a signature'); |
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} |
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return true; |
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case 'signature': |
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if (!in_array('sign', $ops)) { |
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throw new \InvalidArgumentException('Key cannot be used to sign'); |
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} |
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return true; |
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case 'encryption': |
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if (!in_array('encrypt', $ops) && !in_array('wrapKey', $ops)) { |
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throw new \InvalidArgumentException('Key cannot be used to encrypt'); |
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} |
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return true; |
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case 'decryption': |
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if (!in_array('decrypt', $ops) && !in_array('unwrapKey', $ops)) { |
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throw new \InvalidArgumentException('Key cannot be used to decrypt'); |
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} |
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return true; |
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default: |
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throw new \InvalidArgumentException('Unsupported key usage.'); |
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} |
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} |
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/** |
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* @param JWK $key |
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* @param string $usage |
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* |
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* @return bool |
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*/ |
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private static function checkUsage(JWK $key, string $usage): bool |
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{ |
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$use = $key->get('use'); |
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switch ($usage) { |
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case 'verification': |
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case 'signature': |
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if ('sig' !== $use) { |
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throw new \InvalidArgumentException('Key cannot be used to sign or verify a signature.'); |
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} |
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return true; |
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case 'encryption': |
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case 'decryption': |
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if ('enc' !== $use) { |
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throw new \InvalidArgumentException('Key cannot be used to encrypt or decrypt.'); |
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} |
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return true; |
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default: |
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throw new \InvalidArgumentException('Unsupported key usage.'); |
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} |
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} |
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/** |
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* @param JWK $key |
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* @param string $algorithm |
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*/ |
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public static function checkKeyAlgorithm(JWK $key, string $algorithm) |
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{ |
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if (!$key->has('alg')) { |
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return; |
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} |
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if ($key->get('alg') !== $algorithm) { |
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throw new \InvalidArgumentException(sprintf('Key is only allowed for algorithm "%s".', $key->get('alg'))); |
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} |
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} |
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} |
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Spomky-Labs /
jose
