80 lines
2.1 KiB
PHP
80 lines
2.1 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Jose\Component\Encryption\Algorithm\KeyEncryption;
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use AESKW\Wrapper as WrapperInterface;
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use InvalidArgumentException;
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use Jose\Component\Core\JWK;
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use Jose\Component\Core\Util\Base64UrlSafe;
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use Override;
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use RuntimeException;
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use function in_array;
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use function is_string;
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abstract readonly class AESKW implements KeyWrapping
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{
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public function __construct()
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{
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if (! interface_exists(WrapperInterface::class)) {
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throw new RuntimeException('Please install "spomky-labs/aes-key-wrap" to use AES-KW algorithms');
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}
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}
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#[Override]
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public function allowedKeyTypes(): array
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{
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return ['oct'];
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}
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/**
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* @param array<string, mixed> $completeHeader
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* @param array<string, mixed> $additionalHeader
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*/
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#[Override]
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public function wrapKey(JWK $key, string $cek, array $completeHeader, array &$additionalHeader): string
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{
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$k = $this->getKey($key);
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$wrapper = $this->getWrapper();
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return $wrapper::wrap($k, $cek);
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}
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/**
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* @param array<string, mixed> $completeHeader
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*/
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#[Override]
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public function unwrapKey(JWK $key, string $encrypted_cek, array $completeHeader): string
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{
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$k = $this->getKey($key);
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$wrapper = $this->getWrapper();
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return $wrapper::unwrap($k, $encrypted_cek);
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}
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#[Override]
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public function getKeyManagementMode(): string
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{
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return self::MODE_WRAP;
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}
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abstract protected function getWrapper(): WrapperInterface;
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private function getKey(JWK $key): string
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{
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if (! in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
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throw new InvalidArgumentException('Wrong key type.');
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}
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if (! $key->has('k')) {
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throw new InvalidArgumentException('The key parameter "k" is missing.');
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}
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$k = $key->get('k');
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if (! is_string($k)) {
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throw new InvalidArgumentException('The key parameter "k" is invalid.');
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}
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return Base64UrlSafe::decodeNoPadding($k);
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}
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}
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