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<?php |
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namespace Shetabit\Multipay\Drivers\Pasargad\Utils; |
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class RSA |
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{ |
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public const BCCOMP_LARGER = 1; |
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public static function rsaEncrypt($message, $public_key, $modulus, $keylength) |
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{ |
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$padded = RSA::addPKCS1Padding($message, true, $keylength / 8); |
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$number = RSA::binaryToNumber($padded); |
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$encrypted = RSA::powMod($number, $public_key, $modulus); |
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$result = RSA::numberToBinary($encrypted, $keylength / 8); |
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return $result; |
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} |
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public static function rsaDecrypt($message, $private_key, $modulus, $keylength) |
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{ |
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$number = RSA::binaryToNumber($message); |
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$decrypted = RSA::powMod($number, $private_key, $modulus); |
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$result = RSA::numberToBinary($decrypted, $keylength / 8); |
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return RSA::removePKCS1Padding($result, $keylength / 8); |
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} |
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public static function rsaSign($message, $private_key, $modulus, $keylength) |
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{ |
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$padded = RSA::addPKCS1Padding($message, false, $keylength / 8); |
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$number = RSA::binaryToNumber($padded); |
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$signed = RSA::powMod($number, $private_key, $modulus); |
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$result = RSA::numberToBinary($signed, $keylength / 8); |
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return $result; |
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} |
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public static function rsaVerify($message, $public_key, $modulus, $keylength) |
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{ |
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return RSA::rsaDecrypt($message, $public_key, $modulus, $keylength); |
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} |
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public static function rsaKypVerify($message, $public_key, $modulus, $keylength) |
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{ |
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$number = RSA::binaryToNumber($message); |
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$decrypted = RSA::powMod($number, $public_key, $modulus); |
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$result = RSA::numberToBinary($decrypted, $keylength / 8); |
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return RSA::removeKYPPadding($result, $keylength / 8); |
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} |
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public static function powMod($p, $q, $r) |
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{ |
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$factors = array(); |
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$div = $q; |
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$power_of_two = 0; |
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while (bccomp($div, "0") == self::BCCOMP_LARGER) { |
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$rem = bcmod($div, 2); |
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$div = bcdiv($div, 2); |
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if ($rem) { |
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array_push($factors, $power_of_two); |
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} |
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$power_of_two++; |
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} |
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$partial_results = array(); |
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$part_res = $p; |
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$idx = 0; |
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foreach ($factors as $factor) { |
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while ($idx < $factor) { |
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$part_res = bcpow($part_res, "2"); |
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$part_res = bcmod($part_res, $r); |
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$idx++; |
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} |
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array_push($partial_results, $part_res); |
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} |
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$result = "1"; |
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foreach ($partial_results as $part_res) { |
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$result = bcmul($result, $part_res); |
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$result = bcmod($result, $r); |
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} |
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return $result; |
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} |
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public static function addPKCS1Padding($data, $isPublicKey, $blocksize) |
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{ |
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$pad_length = $blocksize - 3 - strlen($data); |
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if ($isPublicKey) { |
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$block_type = "\x02"; |
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$padding = ""; |
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for ($i = 0; $i < $pad_length; $i++) { |
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$rnd = mt_rand(1, 255); |
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$padding .= chr($rnd); |
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} |
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} else { |
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$block_type = "\x01"; |
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$padding = str_repeat("\xFF", $pad_length); |
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} |
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return "\x00" . $block_type . $padding . "\x00" . $data; |
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} |
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public static function removePKCS1Padding($data, $blocksize) |
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{ |
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assert(strlen($data) == $blocksize); |
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$data = substr($data, 1); |
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if ($data[0] == '\0') { |
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die("Block type 0 not implemented."); |
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} |
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assert(($data[0] == "\x01") || ($data[0] == "\x02")); |
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$offset = strpos($data, "\0", 1); |
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return substr($data, $offset + 1); |
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} |
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public static function removeKYPPadding($data, $blocksize) |
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{ |
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assert(strlen($data) == $blocksize); |
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$offset = strpos($data, "\0"); |
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return substr($data, 0, $offset); |
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} |
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public static function binaryToNumber($data) |
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{ |
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$base = "256"; |
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$radix = "1"; |
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$result = "0"; |
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for ($i = strlen($data) - 1; $i >= 0; $i--) { |
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$digit = ord($data[$i]); |
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$part_res = bcmul($digit, $radix); |
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$result = bcadd($result, $part_res); |
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$radix = bcmul($radix, $base); |
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} |
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return $result; |
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} |
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public static function numberToBinary($number, $blocksize) |
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{ |
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$base = "256"; |
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$result = ""; |
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$div = $number; |
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while ($div > 0) { |
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$mod = bcmod($div, $base); |
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$div = bcdiv($div, $base); |
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$result = chr($mod) . $result; |
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} |
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return str_pad($result, $blocksize, "\x00", STR_PAD_LEFT); |
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} |
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} |
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shetabit /
multipay
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