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<?php |
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namespace Mdanter\Ecc\Crypto\Signature; |
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use Mdanter\Ecc\EccFactory; |
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use Mdanter\Ecc\Math\GmpMathInterface; |
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use Mdanter\Ecc\Primitives\GeneratorPoint; |
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use Mdanter\Ecc\Util\BinaryString; |
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use Mdanter\Ecc\Util\NumberSize; |
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class SignHasher implements HasherInterface |
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{ |
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/** |
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* @var int[] |
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*/ |
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protected static $sizeMap = [ |
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'sha1' => 20, |
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'sha224' => 28, |
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'sha256' => 32, |
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'sha384' => 48, |
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'sha512' => 64, |
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]; |
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/** |
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* @var GmpMathInterface |
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*/ |
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private $adapter; |
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/** |
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* @var string |
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*/ |
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private $algorithm; |
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/** |
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* SignHasher constructor. |
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* @param string $algorithm |
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* @param GmpMathInterface|null $math |
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*/ |
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public function __construct(string $algorithm, GmpMathInterface $math = null) |
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{ |
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if (!array_key_exists($algorithm, self::$sizeMap)) { |
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throw new \InvalidArgumentException("Unsupported hashing algorithm"); |
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} |
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$this->algorithm = $algorithm; |
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$this->adapter = $math ?: EccFactory::getAdapter(); |
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} |
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/** |
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* @return string |
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*/ |
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public function getAlgorithm(): string |
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{ |
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return $this->algorithm; |
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} |
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/** |
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* @return int |
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*/ |
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public function getLengthInBytes(): int |
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{ |
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return self::$sizeMap[$this->algorithm]; |
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} |
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/** |
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* @param string $data |
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* @return string |
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*/ |
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public function makeRawHash(string $data): string |
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{ |
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return hash($this->algorithm, $data, false); |
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} |
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/** |
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* @param \GMP $hash |
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* @param GeneratorPoint $G |
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* @return \GMP |
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*/ |
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public function truncateForECDSA(\GMP $hash, GeneratorPoint $G) |
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{ |
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$hashBits = gmp_strval($hash, 2); |
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if (BinaryString::length($hashBits) < self::$sizeMap[$this->algorithm] * 8) { |
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$hashBits = str_pad($hashBits, self::$sizeMap[$this->algorithm] * 8, '0', STR_PAD_LEFT); |
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} |
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return gmp_init(BinaryString::substring($hashBits, 0, NumberSize::bnNumBits($this->adapter, $G->getOrder())), 2); |
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} |
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/** |
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* @param string $data |
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* @param GeneratorPoint $G |
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* @return \GMP |
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*/ |
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public function makeHash(string $data, GeneratorPoint $G): \GMP |
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{ |
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$hash = gmp_init($this->makeRawHash($data), 16); |
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return $this->truncateForECDSA($hash, $G); |
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} |
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} |
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phpecc /
phpecc
