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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of the LetsEncrypt ACME client. |
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* |
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* @author Ivanov Aleksandr <[email protected]> |
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* @copyright 2019-2020 |
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* @license https://github.com/misantron/letsencrypt-client/blob/master/LICENSE MIT License |
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*/ |
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namespace LetsEncrypt\Helper; |
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use LetsEncrypt\Exception\KeyPairException; |
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class Signer implements SignerInterface |
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{ |
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/** |
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* @var Base64SafeEncoder |
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*/ |
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private $base64Encoder; |
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public function __construct(Base64SafeEncoder $base64Encoder) |
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{ |
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$this->base64Encoder = $base64Encoder; |
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} |
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public static function createWithBase64SafeEncoder(): self |
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{ |
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return new static(new Base64SafeEncoder()); |
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} |
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public function getBase64Encoder(): Base64SafeEncoder |
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{ |
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return $this->base64Encoder; |
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} |
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/** |
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* @throws KeyPairException |
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*/ |
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public function jws(array $payload, string $url, string $nonce, string $privateKeyPath): array |
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{ |
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$privateKey = openssl_pkey_get_private('file://' . $privateKeyPath); |
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if ($privateKey === false) { |
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throw KeyPairException::privateKeyInvalid(); |
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} |
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$protected = [ |
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'alg' => 'RS256', |
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'jwk' => $this->jwk($privateKeyPath), |
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'nonce' => $nonce, |
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'url' => $url, |
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]; |
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return $this->sign($protected, $payload, $privateKey); |
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} |
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/** |
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* @throws KeyPairException |
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*/ |
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public function kid(array $payload, string $kid, string $url, string $nonce, string $privateKeyPath): array |
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{ |
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$privateKey = openssl_pkey_get_private('file://' . $privateKeyPath); |
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if ($privateKey === false) { |
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throw KeyPairException::privateKeyInvalid(); |
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} |
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$protected = [ |
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'alg' => 'RS256', |
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'kid' => $kid, |
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'nonce' => $nonce, |
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'url' => $url, |
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]; |
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return $this->sign($protected, $payload, $privateKey); |
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} |
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/** |
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* @throws KeyPairException |
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*/ |
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public function kty(string $privateKeyPath): string |
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{ |
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$header = json_encode($this->jwk($privateKeyPath)); |
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return $this->base64Encoder->hashEncode($header); |
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} |
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/** |
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* @throws KeyPairException |
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*/ |
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public function jwk(string $privateKeyPath): array |
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{ |
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$privateKey = openssl_pkey_get_private('file://' . $privateKeyPath); |
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if ($privateKey === false) { |
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throw KeyPairException::privateKeyInvalid(); |
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} |
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$details = openssl_pkey_get_details($privateKey); |
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if ($details === false) { |
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throw KeyPairException::privateKeyDetailsError(); |
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} |
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return [ |
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'kty' => 'RSA', |
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'n' => $this->base64Encoder->encode($details['rsa']['n']), |
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'e' => $this->base64Encoder->encode($details['rsa']['e']), |
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]; |
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} |
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private function sign(array $protected, array $payload, $privateKey): array |
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{ |
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// empty payload array must be encoded to empty string |
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$payloadEncoded = $payload !== [] ? |
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$this->base64Encoder->encode(str_replace('\\/', '/', json_encode($payload))) : |
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''; |
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$protectedEncoded = $this->base64Encoder->encode(json_encode($protected)); |
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openssl_sign($protectedEncoded . '.' . $payloadEncoded, $signature, $privateKey, OPENSSL_ALGO_SHA256); |
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return [ |
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'protected' => $protectedEncoded, |
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'payload' => $payloadEncoded, |
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'signature' => $this->base64Encoder->encode($signature), |
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]; |
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} |
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} |
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misantron /
letsencrypt-client
