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<?php |
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declare(strict_types=1); |
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namespace Genkgo\Mail\Dkim; |
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use Genkgo\Mail\Exception\FailedToSignHeadersException; |
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final class Sha256Signer implements SignInterface |
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{ |
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private const SIGN_ALGORITHM = OPENSSL_ALGO_SHA256; |
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private const HASH_ALGORITHM = 'sha256'; |
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/** |
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* @var resource |
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*/ |
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private $privateKey; |
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/** |
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* @param resource $key |
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*/ |
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public function __construct($key) |
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{ |
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if (!\is_resource($key) || \get_resource_type($key) !== 'OpenSSL key') { |
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throw new \InvalidArgumentException('Expected a private key resource'); |
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} |
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$this->privateKey = $key; |
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} |
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/** |
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* @param string $canonicalizedBody |
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* @return string |
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*/ |
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public function hashBody(string $canonicalizedBody): string |
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{ |
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return \hash(self::HASH_ALGORITHM, $canonicalizedBody, true); |
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} |
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/** |
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* @param string $canonicalizedHeaders |
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* @return string |
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* @throws \Exception |
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*/ |
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public function signHeaders(string $canonicalizedHeaders): string |
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{ |
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if (\openssl_sign($canonicalizedHeaders, $signature, $this->privateKey, self::SIGN_ALGORITHM)) { |
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return $signature; |
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} |
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// @codeCoverageIgnoreStart |
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throw new FailedToSignHeadersException( |
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\sprintf('Unable to sign DKIM Hash, openssl error: %s', \openssl_error_string()) |
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); |
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// @codeCoverageIgnoreEnd |
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} |
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/** |
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* @return string |
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*/ |
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public function name(): string |
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{ |
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return 'rsa-sha256'; |
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} |
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/** |
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* @param string $file |
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* @param string $passphrase |
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* @return Sha256Signer |
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* @throws \Exception |
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*/ |
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public static function fromFile(string $file, string $passphrase = ''): self |
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{ |
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if (!\file_exists($file)) { |
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throw new \InvalidArgumentException('File does not exist'); |
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} |
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$content = \file_get_contents($file); |
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if ($content === false) { |
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throw new \UnexpectedValueException('Cannot read file ' . $file); |
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} |
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return self::fromString($content, $passphrase); |
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} |
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/** |
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* @param string $privateKeyString |
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* @param string $passphrase |
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* @return Sha256Signer |
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* @throws \Exception |
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*/ |
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public static function fromString(string $privateKeyString, string $passphrase = ''): self |
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{ |
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$key = \openssl_pkey_get_private($privateKeyString, $passphrase); |
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if ($key === false) { |
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throw new \InvalidArgumentException('Cannot create resource from private key string'); |
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} |
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return new self($key); |
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} |
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} |
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genkgo /
mail
