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<?php |
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namespace WebComplete\core\utils\helpers; |
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class SecurityHelper |
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{ |
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/** |
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* @param string $password |
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* @param string $salt |
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* |
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* @return string |
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*/ |
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public function cryptPassword(string $password, string $salt): string |
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{ |
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return \strtoupper(\md5(\md5($salt) . \md5($password))); |
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} |
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/** |
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* Masks a token to make it uncompressible. |
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* Applies a random mask to the token and prepends the mask used to the result making the string always unique. |
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* Used to mitigate BREACH attack by randomizing how token is outputted on each request. |
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* |
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* @param string $token An unmasked token. |
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* |
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* @return string A masked token. |
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* @throws \RuntimeException |
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*/ |
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public function maskToken($token): string |
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{ |
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// The number of bytes in a mask is always equal to the number of bytes in a token. |
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$mask = $this->generateRandomKey(StringHelper::byteLength($token)); |
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return StringHelper::base64UrlEncode($mask . ($mask ^ $token)); |
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} |
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/** |
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* Unmasks a token previously masked by `maskToken`. |
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* @param string $maskedToken A masked token. |
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* @return string An unmasked token, or an empty string in case of token format is invalid. |
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*/ |
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public function unmaskToken($maskedToken): string |
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{ |
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$decoded = StringHelper::base64UrlDecode($maskedToken); |
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$length = StringHelper::byteLength($decoded) / 2; |
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// Check if the masked token has an even length. |
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if (!is_int($length)) { |
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return ''; |
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} |
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return StringHelper::byteSubstr($decoded, $length, $length) ^ |
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StringHelper::byteSubstr($decoded, 0, $length); |
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} |
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/** |
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* Generates specified number of random bytes. |
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* Note that output may not be ASCII. |
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* |
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* @see generateRandomString() if you need a string. |
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* |
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* @param int $length the number of bytes to generate |
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* |
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* @return string the generated random bytes |
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* @throws \RuntimeException |
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*/ |
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public function generateRandomKey(int $length = 32): string |
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{ |
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if ($length < 1) { |
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throw new \RuntimeException('First parameter ($length) must be greater than 0'); |
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} |
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// always use random_bytes() if it is available |
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if (\function_exists('random_bytes')) { |
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return \random_bytes($length); |
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} |
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throw new \RuntimeException('Function random_bytes not found'); |
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} |
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/** |
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* Generates a random string of specified length. |
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* The string generated matches [A-Za-z0-9_-]+ and is transparent to URL-encoding. |
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* |
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* @param int $length the length of the key in characters |
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* |
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* @return string the generated random key |
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* @throws \RuntimeException |
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*/ |
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public function generateRandomString(int $length = 32): string |
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{ |
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if ($length < 1) { |
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throw new \RuntimeException('First parameter ($length) must be greater than 0'); |
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} |
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$bytes = $this->generateRandomKey($length); |
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return \substr(StringHelper::base64UrlEncode($bytes), 0, $length); |
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} |
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} |
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web-complete /
core
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