72 lines
2.0 KiB
PHP
72 lines
2.0 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Jose\Component\Signature\Algorithm;
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use function defined;
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use function in_array;
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use InvalidArgumentException;
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use Jose\Component\Core\JWK;
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use Jose\Component\Core\Util\ECKey;
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use Jose\Component\Core\Util\ECSignature;
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use LogicException;
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use Throwable;
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abstract class ECDSA implements SignatureAlgorithm
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{
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public function __construct()
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{
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if (! defined('OPENSSL_KEYTYPE_EC')) {
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throw new LogicException('Elliptic Curve key type not supported by your environment.');
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}
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}
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public function allowedKeyTypes(): array
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{
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return ['EC'];
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}
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public function sign(JWK $key, string $input): string
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{
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$this->checkKey($key);
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if (! $key->has('d')) {
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throw new InvalidArgumentException('The EC key is not private');
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}
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$pem = ECKey::convertPrivateKeyToPEM($key);
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openssl_sign($input, $signature, $pem, $this->getHashAlgorithm());
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return ECSignature::fromAsn1($signature, $this->getSignaturePartLength());
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}
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public function verify(JWK $key, string $input, string $signature): bool
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{
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$this->checkKey($key);
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try {
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$der = ECSignature::toAsn1($signature, $this->getSignaturePartLength());
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$pem = ECKey::convertPublicKeyToPEM($key);
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return openssl_verify($input, $der, $pem, $this->getHashAlgorithm()) === 1;
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} catch (Throwable) {
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return false;
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}
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}
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abstract protected function getHashAlgorithm(): string;
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abstract protected function getSignaturePartLength(): int;
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private function checkKey(JWK $key): void
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{
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if (! in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
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throw new InvalidArgumentException('Wrong key type.');
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}
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foreach (['x', 'y', 'crv'] as $k) {
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if (! $key->has($k)) {
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throw new InvalidArgumentException(sprintf('The key parameter "%s" is missing.', $k));
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}
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}
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}
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}
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