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<?php declare(strict_types=1); namespace Cose\Algorithm\Signature\EdDSA; use Cose\Algorithm\Signature\Signature; use Cose\Algorithms; use Cose\Key\Key; use Cose\Key\OkpKey; use InvalidArgumentException; use Throwable; use function sodium_crypto_sign_detached; use function sodium_crypto_sign_verify_detached; /** * @see \Cose\Tests\Algorithm\Signature\EdDSA\EdDSATest */ class EdDSA implements Signature { public function sign(string $data, Key $key): string { $key = $this->handleKey($key); if (! $key->isPrivate()) { throw new InvalidArgumentException('The key is not private.'); } $x = $key->x(); $d = $key->d(); $secret = $d . $x; return match ($key->curve()) { OkpKey::CURVE_ED25519 => sodium_crypto_sign_detached($data, $secret), OkpKey::CURVE_NAME_ED25519 => sodium_crypto_sign_detached($data, $secret), default => throw new InvalidArgumentException('Unsupported curve'), }; } public function verify(string $data, Key $key, string $signature): bool { $key = $this->handleKey($key); if ($key->curve() !== OkpKey::CURVE_ED25519 && $key->curve() !== OkpKey::CURVE_NAME_ED25519) { throw new InvalidArgumentException('Unsupported curve'); } try { return sodium_crypto_sign_verify_detached($signature, $data, $key->x()); } catch (Throwable) { return false; } } public static function identifier(): int { return Algorithms::COSE_ALGORITHM_EDDSA; } private function handleKey(Key $key): OkpKey { return OkpKey::create($key->getData()); } }
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