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<?php declare(strict_types=1); |
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namespace MiladRahimi\Jwt\Cryptography\Algorithms\Ecdsa; |
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use MiladRahimi\Jwt\Cryptography\Keys\EcdsaPublicKey; |
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use MiladRahimi\Jwt\Cryptography\Verifier; |
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use MiladRahimi\Jwt\Exceptions\InvalidSignatureException; |
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use function chr; |
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use function ltrim; |
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use function ord; |
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use function str_split; |
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use function strlen; |
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abstract class AbstractEcdsaVerifier implements Verifier |
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{ |
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protected const ASN1_INTEGER = 0x02; |
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protected const ASN1_SEQUENCE = 0x10; |
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protected static string $name; |
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protected EcdsaPublicKey $publicKey; |
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public function __construct(EcdsaPublicKey $key) |
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{ |
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$this->publicKey = $key; |
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} |
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protected function algorithm(): int |
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{ |
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return [ |
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'ES256' => OPENSSL_ALGO_SHA256, |
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'ES256K' => OPENSSL_ALGO_SHA256, |
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'ES384' => OPENSSL_ALGO_SHA384, |
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][static::$name]; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function verify(string $plain, string $signature): void |
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{ |
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$signature = $this->signatureToDer($signature); |
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if (openssl_verify($plain, $signature, $this->publicKey->getResource(), $this->algorithm()) !== 1) { |
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throw new InvalidSignatureException(openssl_error_string() ?: "The signature is invalid."); |
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} |
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} |
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protected function signatureToDer(string $signature): string |
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{ |
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$length = max(1, (int)(strlen($signature) / 2)); |
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[$r, $s] = str_split($signature, $length); |
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$r = ltrim($r, "\x00"); |
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$s = ltrim($s, "\x00"); |
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if (ord($r[0]) > 0x7f) { |
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$r = "\x00" . $r; |
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} |
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if (ord($s[0]) > 0x7f) { |
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$s = "\x00" . $s; |
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} |
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return $this->encodeDer( |
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self::ASN1_SEQUENCE, |
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$this->encodeDer(self::ASN1_INTEGER, $r) . $this->encodeDer(self::ASN1_INTEGER, $s), |
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); |
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} |
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protected function encodeDer(int $type, string $value): string |
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{ |
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$tagHeader = 0; |
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if ($type === self::ASN1_SEQUENCE) { |
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$tagHeader |= 0x20; |
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} |
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$der = chr($tagHeader | $type); |
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$der .= chr(strlen($value)); |
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return $der . $value; |
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} |
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public function getPublicKey(): EcdsaPublicKey |
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{ |
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return $this->publicKey; |
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} |
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} |
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miladrahimi /
php-jwt
