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<?php |
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namespace Shetabit\Payment\Drivers\Pasargad\Utils; |
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define("BCCOMP_LARGER", 1); |
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class RSA |
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{ |
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public function encrypt($message, $public_key, $modulus, $keylength) |
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{ |
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$padded = $this->add_PKCS1_padding($message, true, $keylength / 8); |
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$number = $this->binary_to_number($padded); |
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$encrypted = $this->pow_mod($number, $public_key, $modulus); |
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$result = $this->number_to_binary($encrypted, $keylength / 8); |
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return $result; |
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} |
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public function decrypt($message, $private_key, $modulus, $keylength) |
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{ |
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$number = $this->binary_to_number($message); |
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$decrypted = $this->pow_mod($number, $private_key, $modulus); |
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$result = $this->number_to_binary($decrypted, $keylength / 8); |
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return $this->remove_PKCS1_padding($result, $keylength / 8); |
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} |
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public function sign($message, $private_key, $modulus, $keylength) |
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{ |
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$padded = $this->add_PKCS1_padding($message, false, $keylength / 8); |
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$number = $this->binary_to_number($padded); |
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$signed = $this->pow_mod($number, $private_key, $modulus); |
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$result = $this->number_to_binary($signed, $keylength / 8); |
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return $result; |
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} |
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public function rsa_verify($message, $public_key, $modulus, $keylength) |
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{ |
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return $this->decrypt($message, $public_key, $modulus, $keylength); |
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} |
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public function kyp_verify($message, $public_key, $modulus, $keylength) |
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{ |
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$number = $this->binary_to_number($message); |
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$decrypted = $this->pow_mod($number, $public_key, $modulus); |
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$result = $this->number_to_binary($decrypted, $keylength / 8); |
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return $this->remove_KYP_padding($result, $keylength / 8); |
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} |
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private function pow_mod($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($div, "0") == BCCOMP_LARGER) { |
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$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 $result; |
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} |
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private function add_PKCS1_padding($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" . $data; |
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} |
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private function remove_PKCS1_padding($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, $offset + 1); |
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} |
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private function remove_KYP_padding($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, $offset); |
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} |
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private function binary_to_number($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 $result; |
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} |
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private function number_to_binary($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 /
payment
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In general, usage of exit should be done with care and only when running in a scripting context like a CLI script.