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<?php |
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declare(strict_types = 1); |
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namespace Sop\PKCS5\PRF; |
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use Sop\CryptoTypes\AlgorithmIdentifier\AlgorithmIdentifier; |
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use Sop\CryptoTypes\AlgorithmIdentifier\Feature\PRFAlgorithmIdentifier; |
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/** |
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* Base class for pseudorandom functions used in password-based cryptography. |
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* |
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* @see https://tools.ietf.org/html/rfc2898#appendix-B.1 |
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*/ |
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abstract class PRF |
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{ |
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/** |
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* Mapping from hash algorithm identifier OID to class name. |
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* |
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* @internal |
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* |
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* @var array |
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*/ |
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const MAP_HASH_OID_TO_CLASS = [ |
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AlgorithmIdentifier::OID_HMAC_WITH_SHA1 => HMACSHA1::class, |
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AlgorithmIdentifier::OID_HMAC_WITH_SHA224 => HMACSHA224::class, |
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AlgorithmIdentifier::OID_HMAC_WITH_SHA256 => HMACSHA256::class, |
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AlgorithmIdentifier::OID_HMAC_WITH_SHA384 => HMACSHA384::class, |
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AlgorithmIdentifier::OID_HMAC_WITH_SHA512 => HMACSHA512::class, |
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]; |
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/** |
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* Length of the produced output in bytes. |
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* |
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* @var int |
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*/ |
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protected $_length; |
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/** |
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* Functor interface. |
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* |
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* @param string $arg1 |
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* @param string $arg2 |
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* |
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* @return string |
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*/ |
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public function __invoke(string $arg1, string $arg2): string |
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{ |
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return $this->compute($arg1, $arg2); |
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} |
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/** |
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* Compute pseudorandom value from arguments. |
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* |
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* @param string $arg1 First argument |
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* @param string $arg2 Second argument |
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* |
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* @return string Output |
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*/ |
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abstract public function compute(string $arg1, string $arg2): string; |
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/** |
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* Get output length. |
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* |
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* @return int |
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*/ |
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public function length(): int |
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{ |
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return $this->_length; |
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} |
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/** |
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* Get PRF by algorithm identifier. |
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* |
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* @param PRFAlgorithmIdentifier $algo |
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* |
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* @throws \UnexpectedValueException |
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* |
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* @return self |
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*/ |
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public static function fromAlgorithmIdentifier(PRFAlgorithmIdentifier $algo): PRF |
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{ |
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$oid = $algo->oid(); |
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if (array_key_exists($oid, self::MAP_HASH_OID_TO_CLASS)) { |
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$cls = self::MAP_HASH_OID_TO_CLASS[$oid]; |
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return new $cls(); |
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} |
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throw new \UnexpectedValueException( |
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'PRF algorithm ' . $algo->oid() . ' not supported.'); |
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} |
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} |
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sop /
pkcs5
