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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2019 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Component\Encryption\Algorithm\KeyEncryption\Util; |
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use InvalidArgumentException; |
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use Jose\Component\Core\Util\BigInteger; |
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use Jose\Component\Core\Util\Hash; |
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use Jose\Component\Core\Util\RSAKey; |
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use RuntimeException; |
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/** |
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* @internal |
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*/ |
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class RSACrypt |
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{ |
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/** |
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* Optimal Asymmetric Encryption Padding (OAEP). |
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*/ |
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public const ENCRYPTION_OAEP = 1; |
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/** |
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* Use PKCS#1 padding. |
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*/ |
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public const ENCRYPTION_PKCS1 = 2; |
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public static function encrypt(RSAKey $key, string $data, int $mode, ?string $hash = null): string |
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{ |
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switch ($mode) { |
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case self::ENCRYPTION_OAEP: |
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return self::encryptWithRSAOAEP($key, $data, $hash); |
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case self::ENCRYPTION_PKCS1: |
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return self::encryptWithRSA15($key, $data); |
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default: |
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throw new InvalidArgumentException('Unsupported mode.'); |
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} |
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} |
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public static function decrypt(RSAKey $key, string $plaintext, int $mode, ?string $hash = null): string |
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{ |
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switch ($mode) { |
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case self::ENCRYPTION_OAEP: |
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return self::decryptWithRSAOAEP($key, $plaintext, $hash); |
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case self::ENCRYPTION_PKCS1: |
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return self::decryptWithRSA15($key, $plaintext); |
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default: |
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throw new InvalidArgumentException('Unsupported mode.'); |
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} |
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} |
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public static function encryptWithRSA15(RSAKey $key, string $data): string |
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{ |
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$mLen = mb_strlen($data, '8bit'); |
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if ($mLen > $key->getModulusLength() - 11) { |
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throw new InvalidArgumentException('Message too long'); |
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} |
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$psLen = $key->getModulusLength() - $mLen - 3; |
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$ps = ''; |
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while (mb_strlen($ps, '8bit') !== $psLen) { |
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$temp = random_bytes($psLen - mb_strlen($ps, '8bit')); |
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$temp = str_replace("\x00", '', $temp); |
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$ps .= $temp; |
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} |
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$type = 2; |
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$data = \chr(0).\chr($type).$ps.\chr(0).$data; |
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$data = BigInteger::createFromBinaryString($data); |
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$c = self::getRSAEP($key, $data); |
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return self::convertIntegerToOctetString($c, $key->getModulusLength()); |
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} |
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public static function decryptWithRSA15(RSAKey $key, string $c): string |
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{ |
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if (mb_strlen($c, '8bit') !== $key->getModulusLength()) { |
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throw new InvalidArgumentException('Unable to decrypt'); |
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} |
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$c = BigInteger::createFromBinaryString($c); |
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$m = self::getRSADP($key, $c); |
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$em = self::convertIntegerToOctetString($m, $key->getModulusLength()); |
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if (0 !== \ord($em[0]) || \ord($em[1]) > 2) { |
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throw new InvalidArgumentException('Unable to decrypt'); |
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} |
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$ps = mb_substr($em, 2, (int) mb_strpos($em, \chr(0), 2, '8bit') - 2, '8bit'); |
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$m = mb_substr($em, mb_strlen($ps, '8bit') + 3, null, '8bit'); |
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if (mb_strlen($ps, '8bit') < 8) { |
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throw new InvalidArgumentException('Unable to decrypt'); |
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} |
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return $m; |
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} |
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/** |
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* Encryption. |
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*/ |
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public static function encryptWithRSAOAEP(RSAKey $key, string $plaintext, string $hash_algorithm): string |
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{ |
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/** @var Hash $hash */ |
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$hash = Hash::$hash_algorithm(); |
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$length = $key->getModulusLength() - 2 * $hash->getLength() - 2; |
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if (0 >= $length) { |
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throw new RuntimeException(); |
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} |
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$plaintext = mb_str_split($plaintext, $length, '8bit'); |
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if (!\is_array($plaintext)) { |
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throw new RuntimeException('Invalid payload'); |
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} |
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$ciphertext = ''; |
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foreach ($plaintext as $m) { |
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$ciphertext .= self::encryptRSAESOAEP($key, $m, $hash); |
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} |
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return $ciphertext; |
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} |
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/** |
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* Decryption. |
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*/ |
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public static function decryptWithRSAOAEP(RSAKey $key, string $ciphertext, string $hash_algorithm): string |
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{ |
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if (0 >= $key->getModulusLength()) { |
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throw new RuntimeException('Invalid modulus length'); |
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} |
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$hash = Hash::$hash_algorithm(); |
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$ciphertext = mb_str_split($ciphertext, $key->getModulusLength(), '8bit'); |
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if (!\is_array($ciphertext)) { |
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throw new RuntimeException('Invalid ciphertext'); |
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} |
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$ciphertext[\count($ciphertext) - 1] = str_pad($ciphertext[\count($ciphertext) - 1], $key->getModulusLength(), \chr(0), STR_PAD_LEFT); |
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$plaintext = ''; |
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foreach ($ciphertext as $c) { |
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$temp = self::getRSAESOAEP($key, $c, $hash); |
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$plaintext .= $temp; |
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} |
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return $plaintext; |
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} |
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private static function convertIntegerToOctetString(BigInteger $x, int $xLen): string |
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{ |
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$x = $x->toBytes(); |
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if (mb_strlen($x, '8bit') > $xLen) { |
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throw new RuntimeException('Invalid length.'); |
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} |
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return str_pad($x, $xLen, \chr(0), STR_PAD_LEFT); |
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} |
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/** |
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* Octet-String-to-Integer primitive. |
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*/ |
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private static function convertOctetStringToInteger(string $x): BigInteger |
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{ |
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return BigInteger::createFromBinaryString($x); |
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} |
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/** |
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* RSA EP. |
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*/ |
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private static function getRSAEP(RSAKey $key, BigInteger $m): BigInteger |
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{ |
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if ($m->compare(BigInteger::createFromDecimal(0)) < 0 || $m->compare($key->getModulus()) > 0) { |
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throw new RuntimeException(); |
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} |
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return RSAKey::exponentiate($key, $m); |
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} |
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/** |
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* RSA DP. |
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*/ |
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private static function getRSADP(RSAKey $key, BigInteger $c): BigInteger |
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{ |
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if ($c->compare(BigInteger::createFromDecimal(0)) < 0 || $c->compare($key->getModulus()) > 0) { |
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throw new RuntimeException(); |
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} |
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return RSAKey::exponentiate($key, $c); |
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} |
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/** |
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* MGF1. |
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*/ |
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private static function getMGF1(string $mgfSeed, int $maskLen, Hash $mgfHash): string |
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{ |
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$t = ''; |
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$count = ceil($maskLen / $mgfHash->getLength()); |
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for ($i = 0; $i < $count; ++$i) { |
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$c = pack('N', $i); |
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$t .= $mgfHash->hash($mgfSeed.$c); |
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} |
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return mb_substr($t, 0, $maskLen, '8bit'); |
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} |
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/** |
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* RSAES-OAEP-ENCRYPT. |
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*/ |
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private static function encryptRSAESOAEP(RSAKey $key, string $m, Hash $hash): string |
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{ |
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$mLen = mb_strlen($m, '8bit'); |
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$lHash = $hash->hash(''); |
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$ps = str_repeat(\chr(0), $key->getModulusLength() - $mLen - 2 * $hash->getLength() - 2); |
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$db = $lHash.$ps.\chr(1).$m; |
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$seed = random_bytes($hash->getLength()); |
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$dbMask = self::getMGF1($seed, $key->getModulusLength() - $hash->getLength() - 1, $hash/*MGF*/); |
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$maskedDB = (string) ($db ^ $dbMask); |
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$seedMask = self::getMGF1($maskedDB, $hash->getLength(), $hash/*MGF*/); |
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$maskedSeed = $seed ^ $seedMask; |
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$em = \chr(0).$maskedSeed.$maskedDB; |
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$m = self::convertOctetStringToInteger($em); |
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$c = self::getRSAEP($key, $m); |
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return self::convertIntegerToOctetString($c, $key->getModulusLength()); |
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} |
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/** |
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* RSAES-OAEP-DECRYPT. |
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*/ |
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private static function getRSAESOAEP(RSAKey $key, string $c, Hash $hash): string |
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{ |
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$c = self::convertOctetStringToInteger($c); |
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$m = self::getRSADP($key, $c); |
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$em = self::convertIntegerToOctetString($m, $key->getModulusLength()); |
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$lHash = $hash->hash(''); |
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$maskedSeed = mb_substr($em, 1, $hash->getLength(), '8bit'); |
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$maskedDB = mb_substr($em, $hash->getLength() + 1, null, '8bit'); |
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$seedMask = self::getMGF1($maskedDB, $hash->getLength(), $hash/*MGF*/); |
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$seed = (string) ($maskedSeed ^ $seedMask); |
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$dbMask = self::getMGF1($seed, $key->getModulusLength() - $hash->getLength() - 1, $hash/*MGF*/); |
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$db = $maskedDB ^ $dbMask; |
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$lHash2 = mb_substr($db, 0, $hash->getLength(), '8bit'); |
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$m = mb_substr($db, $hash->getLength(), null, '8bit'); |
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if (!hash_equals($lHash, $lHash2)) { |
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throw new RuntimeException(); |
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} |
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$m = ltrim($m, \chr(0)); |
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if (1 !== \ord($m[0])) { |
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throw new RuntimeException(); |
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} |
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return mb_substr($m, 1, null, '8bit'); |
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} |
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} |
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It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: