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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\EcdsaPrivateKey; |
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use MiladRahimi\Jwt\Cryptography\Signer; |
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use MiladRahimi\Jwt\Exceptions\SigningException; |
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use function ltrim; |
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use function ord; |
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use function str_pad; |
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use function strlen; |
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use function substr; |
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abstract class AbstractEcdsaSigner implements Signer |
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{ |
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protected const ASN1_BIT_STRING = 0x03; |
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protected static string $name; |
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protected EcdsaPrivateKey $privateKey; |
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public function __construct(EcdsaPrivateKey $privateKey) |
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{ |
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$this->privateKey = $privateKey; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function name(): string |
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{ |
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return static::$name; |
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} |
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public function sign(string $message): string |
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{ |
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if (openssl_sign($message, $signature, $this->privateKey->getResource(), $this->algorithm()) === true) { |
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return $this->derToSignature($signature, $this->keySize()); |
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} |
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throw new SigningException(openssl_error_string() ?: "OpenSSL cannot sign the token."); |
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} |
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protected function algorithm(): int |
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{ |
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return [ |
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'ES256' => OPENSSL_ALGO_SHA256, |
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'ES256K' => OPENSSL_ALGO_SHA256, |
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'ES384' => OPENSSL_ALGO_SHA384, |
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][static::$name]; |
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} |
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protected function keySize(): int |
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{ |
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return [ |
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'ES256' => 256, |
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'ES256K' => 256, |
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'ES384' => 384, |
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][static::$name]; |
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} |
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protected function derToSignature(string $der, int $keySize): string |
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{ |
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$i = $this->decodeDer($der)[0]; |
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[$i, $r] = $this->decodeDer($der, $i); |
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$s = $this->decodeDer($der, $i)[1]; |
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$r = ltrim($r, "\x00"); |
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$s = ltrim($s, "\x00"); |
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$r = str_pad($r, $keySize / 8, "\x00", STR_PAD_LEFT); |
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$s = str_pad($s, $keySize / 8, "\x00", STR_PAD_LEFT); |
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return $r . $s; |
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} |
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protected function decodeDer(string $der, int $offset = 0): array |
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{ |
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$pos = $offset; |
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$size = strlen($der); |
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$constructed = (ord($der[$pos]) >> 5) & 0x01; |
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$type = ord($der[$pos++]) & 0x1f; |
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$len = ord($der[$pos++]); |
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if ($len & 0x80) { |
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$n = $len & 0x1f; |
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$len = 0; |
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while ($n-- && $pos < $size) { |
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$len = ($len << 8) | ord($der[$pos++]); |
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} |
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} |
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if ($type === self::ASN1_BIT_STRING) { |
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$pos++; |
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$data = substr($der, $pos, $len - 1); |
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$pos += $len - 1; |
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} elseif (!$constructed) { |
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$data = substr($der, $pos, $len); |
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$pos += $len; |
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} else { |
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$data = ''; |
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} |
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return [$pos, $data]; |
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} |
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public function getPrivateKey(): EcdsaPrivateKey |
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{ |
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return $this->privateKey; |
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} |
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} |
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miladrahimi /
php-jwt
