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<?php
/**
* Wrapper around hash() and hash_hmac() functions supporting truncated hashes
* such as sha256-96. Any hash algorithm returned by hash_algos() (and
* truncated versions thereof) are supported.
*
* If {@link self::setKey() setKey()} is called, {@link self::hash() hash()} will
* return the HMAC as opposed to the hash.
*
* Here's a short example of how to use this library:
* <code>
* <?php
* include 'vendor/autoload.php';
*
* $hash = new \phpseclib3\Crypt\Hash('sha512');
*
* $hash->setKey('abcdefg');
*
* echo base64_encode($hash->hash('abcdefg'));
* ?>
* </code>
*
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2015 Jim Wigginton
* @author Andreas Fischer <bantu@phpbb.com>
* @copyright 2015 Andreas Fischer
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib3\Crypt;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Exception\InsufficientSetupException;
use phpseclib3\Exception\UnsupportedAlgorithmException;
use phpseclib3\Math\BigInteger;
use phpseclib3\Math\PrimeField;
/**
* @author Jim Wigginton <terrafrost@php.net>
* @author Andreas Fischer <bantu@phpbb.com>
*/
class Hash
{
/**
* Padding Types
*
*/
const PADDING_KECCAK = 1;
/**
* Padding Types
*
*/
const PADDING_SHA3 = 2;
/**
* Padding Types
*
*/
const PADDING_SHAKE = 3;
/**
* Padding Type
*
* Only used by SHA3
*
* @var int
*/
private $paddingType = 0;
/**
* Hash Parameter
*
* @see self::setHash()
* @var int
*/
private $hashParam;
/**
* Byte-length of hash output (Internal HMAC)
*
* @see self::setHash()
* @var int
*/
private $length;
/**
* Hash Algorithm
*
* @see self::setHash()
* @var string
*/
private $algo;
/**
* Key
*
* @see self::setKey()
* @var string
*/
private $key = false;
/**
* Nonce
*
* @see self::setNonce()
* @var string
*/
private $nonce = false;
/**
* Hash Parameters
*
* @var array
*/
private $parameters = [];
/**
* Computed Key
*
* @see self::_computeKey()
* @var string
*/
private $computedKey = false;
/**
* Outer XOR (Internal HMAC)
*
* Used only for sha512/*
*
* @see self::hash()
* @var string
*/
private $opad;
/**
* Inner XOR (Internal HMAC)
*
* Used only for sha512/*
*
* @see self::hash()
* @var string
*/
private $ipad;
/**
* Recompute AES Key
*
* Used only for umac
*
* @see self::hash()
* @var boolean
*/
private $recomputeAESKey;
/**
* umac cipher object
*
* @see self::hash()
* @var \phpseclib3\Crypt\AES
*/
private $c;
/**
* umac pad
*
* @see self::hash()
* @var string
*/
private $pad;
/**
* Block Size
*
* @var int
*/
private $blockSize;
/**#@+
* UMAC variables
*
* @var PrimeField
*/
private static $factory36;
private static $factory64;
private static $factory128;
private static $offset64;
private static $offset128;
private static $marker64;
private static $marker128;
private static $maxwordrange64;
private static $maxwordrange128;
/**#@-*/
/**
* Default Constructor.
*
* @param string $hash
*/
public function __construct($hash = 'sha256')
{
$this->setHash($hash);
}
/**
* Sets the key for HMACs
*
* Keys can be of any length.
*
* @param string $key
*/
public function setKey($key = false)
{
$this->key = $key;
$this->computeKey();
$this->recomputeAESKey = true;
}
/**
* Sets the nonce for UMACs
*
* Keys can be of any length.
*
* @param string $nonce
*/
public function setNonce($nonce = false)
{
switch (true) {
case !is_string($nonce):
case strlen($nonce) > 0 && strlen($nonce) <= 16:
$this->recomputeAESKey = true;
$this->nonce = $nonce;
return;
}
throw new \LengthException('The nonce length must be between 1 and 16 bytes, inclusive');
}
/**
* Pre-compute the key used by the HMAC
*
* Quoting http://tools.ietf.org/html/rfc2104#section-2, "Applications that use keys longer than B bytes
* will first hash the key using H and then use the resultant L byte string as the actual key to HMAC."
*
* As documented in https://www.reddit.com/r/PHP/comments/9nct2l/symfonypolyfill_hash_pbkdf2_correct_fix_for/
* when doing an HMAC multiple times it's faster to compute the hash once instead of computing it during
* every call
*
*/
private function computeKey()
{
if ($this->key === false) {
$this->computedKey = false;
return;
}
if (strlen($this->key) <= $this->getBlockLengthInBytes()) {
$this->computedKey = $this->key;
return;
}
$this->computedKey = is_array($this->algo) ?
call_user_func($this->algo, $this->key) :
hash($this->algo, $this->key, true);
}
/**
* Gets the hash function.
*
* As set by the constructor or by the setHash() method.
*
* @return string
*/
public function getHash()
{
return $this->hashParam;
}
/**
* Sets the hash function.
*
* @param string $hash
*/
public function setHash($hash)
{
$this->hashParam = $hash = strtolower($hash);
switch ($hash) {
case 'umac-32':
case 'umac-64':
case 'umac-96':
case 'umac-128':
$this->blockSize = 128;
$this->length = abs(substr($hash, -3)) >> 3;
$this->algo = 'umac';
return;
case 'md2-96':
case 'md5-96':
case 'sha1-96':
case 'sha224-96':
case 'sha256-96':
case 'sha384-96':
case 'sha512-96':
case 'sha512/224-96':
case 'sha512/256-96':
$hash = substr($hash, 0, -3);
$this->length = 12; // 96 / 8 = 12
break;
case 'md2':
case 'md5':
$this->length = 16;
break;
case 'sha1':
$this->length = 20;
break;
case 'sha224':
case 'sha512/224':
case 'sha3-224':
$this->length = 28;
break;
case 'keccak256':
$this->paddingType = self::PADDING_KECCAK;
// fall-through
case 'sha256':
case 'sha512/256':
case 'sha3-256':
$this->length = 32;
break;
case 'sha384':
case 'sha3-384':
$this->length = 48;
break;
case 'sha512':
case 'sha3-512':
$this->length = 64;
break;
default:
if (preg_match('#^(shake(?:128|256))-(\d+)$#', $hash, $matches)) {
$this->paddingType = self::PADDING_SHAKE;
$hash = $matches[1];
$this->length = $matches[2] >> 3;
} else {
throw new UnsupportedAlgorithmException(
"$hash is not a supported algorithm"
);
}
}
switch ($hash) {
case 'md2':
case 'md2-96':
$this->blockSize = 128;
break;
case 'md5-96':
case 'sha1-96':
case 'sha224-96':
case 'sha256-96':
case 'md5':
case 'sha1':
case 'sha224':
case 'sha256':
$this->blockSize = 512;
break;
case 'sha3-224':
$this->blockSize = 1152; // 1600 - 2*224
break;
case 'sha3-256':
case 'shake256':
case 'keccak256':
$this->blockSize = 1088; // 1600 - 2*256
break;
case 'sha3-384':
$this->blockSize = 832; // 1600 - 2*384
break;
case 'sha3-512':
$this->blockSize = 576; // 1600 - 2*512
break;
case 'shake128':
$this->blockSize = 1344; // 1600 - 2*128
break;
default:
$this->blockSize = 1024;
}
if (in_array(substr($hash, 0, 5), ['sha3-', 'shake', 'kecca'])) {
// PHP 7.1.0 introduced support for "SHA3 fixed mode algorithms":
// http://php.net/ChangeLog-7.php#7.1.0
if (version_compare(PHP_VERSION, '7.1.0') < 0 || substr($hash, 0, 5) != 'sha3-') {
//preg_match('#(\d+)$#', $hash, $matches);
//$this->parameters['capacity'] = 2 * $matches[1]; // 1600 - $this->blockSize
//$this->parameters['rate'] = 1600 - $this->parameters['capacity']; // == $this->blockSize
if (!$this->paddingType) {
$this->paddingType = self::PADDING_SHA3;
}
$this->parameters = [
'capacity' => 1600 - $this->blockSize,
'rate' => $this->blockSize,
'length' => $this->length,
'padding' => $this->paddingType
];
$hash = ['phpseclib3\Crypt\Hash', PHP_INT_SIZE == 8 ? 'sha3_64' : 'sha3_32'];
}
}
if ($hash == 'sha512/224' || $hash == 'sha512/256') {
// PHP 7.1.0 introduced sha512/224 and sha512/256 support:
// http://php.net/ChangeLog-7.php#7.1.0
if (version_compare(PHP_VERSION, '7.1.0') < 0) {
// from http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf#page=24
$initial = $hash == 'sha512/256' ?
[
'22312194FC2BF72C', '9F555FA3C84C64C2', '2393B86B6F53B151', '963877195940EABD',
'96283EE2A88EFFE3', 'BE5E1E2553863992', '2B0199FC2C85B8AA', '0EB72DDC81C52CA2'
] :
[
'8C3D37C819544DA2', '73E1996689DCD4D6', '1DFAB7AE32FF9C82', '679DD514582F9FCF',
'0F6D2B697BD44DA8', '77E36F7304C48942', '3F9D85A86A1D36C8', '1112E6AD91D692A1'
];
for ($i = 0; $i < 8; $i++) {
$initial[$i] = new BigInteger($initial[$i], 16);
$initial[$i]->setPrecision(64);
}
$this->parameters = compact('initial');
$hash = ['phpseclib3\Crypt\Hash', 'sha512'];
}
}
if (is_array($hash)) {
$b = $this->blockSize >> 3;
$this->ipad = str_repeat(chr(0x36), $b);
$this->opad = str_repeat(chr(0x5C), $b);
}
$this->algo = $hash;
$this->computeKey();
}
/**
* KDF: Key-Derivation Function
*
* The key-derivation function generates pseudorandom bits used to key the hash functions.
*
* @param int $index a non-negative integer less than 2^64
* @param int $numbytes a non-negative integer less than 2^64
* @return string string of length numbytes bytes
*/
private function kdf($index, $numbytes)
{
$this->c->setIV(pack('N4', 0, $index, 0, 1));
return $this->c->encrypt(str_repeat("\0", $numbytes));
}
/**
* PDF Algorithm
*
* @return string string of length taglen bytes.
*/
private function pdf()
{
$k = $this->key;
$nonce = $this->nonce;
$taglen = $this->length;
//
// Extract and zero low bit(s) of Nonce if needed
//
if ($taglen <= 8) {
$last = strlen($nonce) - 1;
$mask = $taglen == 4 ? "\3" : "\1";
$index = $nonce[$last] & $mask;
$nonce[$last] = $nonce[$last] ^ $index;
}
//
// Make Nonce BLOCKLEN bytes by appending zeroes if needed
//
$nonce = str_pad($nonce, 16, "\0");
//
// Generate subkey, encipher and extract indexed substring
//
$kp = $this->kdf(0, 16);
$c = new AES('ctr');
$c->disablePadding();
$c->setKey($kp);
$c->setIV($nonce);
$t = $c->encrypt("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
// we could use ord() but per https://paragonie.com/blog/2016/06/constant-time-encoding-boring-cryptography-rfc-4648-and-you
// unpack() doesn't leak timing info
return $taglen <= 8 ?
substr($t, unpack('C', $index)[1] * $taglen, $taglen) :
substr($t, 0, $taglen);
}
/**
* UHASH Algorithm
*
* @param string $m string of length less than 2^67 bits.
* @param int $taglen the integer 4, 8, 12 or 16.
* @return string string of length taglen bytes.
*/
private function uhash($m, $taglen)
{
//
// One internal iteration per 4 bytes of output
//
$iters = $taglen >> 2;
//
// Define total key needed for all iterations using KDF.
// L1Key reuses most key material between iterations.
//
//$L1Key = $this->kdf(1, 1024 + ($iters - 1) * 16);
$L1Key = $this->kdf(1, (1024 + ($iters - 1)) * 16);
$L2Key = $this->kdf(2, $iters * 24);
$L3Key1 = $this->kdf(3, $iters * 64);
$L3Key2 = $this->kdf(4, $iters * 4);
//
// For each iteration, extract key and do three-layer hash.
// If bytelength(M) <= 1024, then skip L2-HASH.
//
$y = '';
for ($i = 0; $i < $iters; $i++) {
$L1Key_i = substr($L1Key, $i * 16, 1024);
$L2Key_i = substr($L2Key, $i * 24, 24);
$L3Key1_i = substr($L3Key1, $i * 64, 64);
$L3Key2_i = substr($L3Key2, $i * 4, 4);
$a = self::L1Hash($L1Key_i, $m);
$b = strlen($m) <= 1024 ? "\0\0\0\0\0\0\0\0$a" : self::L2Hash($L2Key_i, $a);
$c = self::L3Hash($L3Key1_i, $L3Key2_i, $b);
$y .= $c;
}
return $y;
}
/**
* L1-HASH Algorithm
*
* The first-layer hash breaks the message into 1024-byte chunks and
* hashes each with a function called NH. Concatenating the results
* forms a string, which is up to 128 times shorter than the original.
*
* @param string $k string of length 1024 bytes.
* @param string $m string of length less than 2^67 bits.
* @return string string of length (8 * ceil(bitlength(M)/8192)) bytes.
*/
private static function L1Hash($k, $m)
{
//
// Break M into 1024 byte chunks (final chunk may be shorter)
//
$m = str_split($m, 1024);
//
// For each chunk, except the last: endian-adjust, NH hash
// and add bit-length. Use results to build Y.
//
$length = new BigInteger(1024 * 8);
$y = '';
for ($i = 0; $i < count($m) - 1; $i++) {
$m[$i] = pack('N*', ...unpack('V*', $m[$i])); // ENDIAN-SWAP
$y .= static::nh($k, $m[$i], $length);
}
//
// For the last chunk: pad to 32-byte boundary, endian-adjust,
// NH hash and add bit-length. Concatenate the result to Y.
//
$length = count($m) ? strlen($m[$i]) : 0;
$pad = 32 - ($length % 32);
$pad = max(32, $length + $pad % 32);
$m[$i] = str_pad(isset($m[$i]) ? $m[$i] : '', $pad, "\0"); // zeropad
$m[$i] = pack('N*', ...unpack('V*', $m[$i])); // ENDIAN-SWAP
$y .= static::nh($k, $m[$i], new BigInteger($length * 8));
return $y;
}
/**
* NH Algorithm
*
* @param string $k string of length 1024 bytes.
* @param string $m string with length divisible by 32 bytes.
* @return string string of length 8 bytes.
*/
private static function nh($k, $m, $length)
{
$toUInt32 = function ($x) {
$x = new BigInteger($x, 256);
$x->setPrecision(32);
return $x;
};
//
// Break M and K into 4-byte chunks
//
//$t = strlen($m) >> 2;
$m = str_split($m, 4);
$t = count($m);
$k = str_split($k, 4);
$k = array_pad(array_slice($k, 0, $t), $t, 0);
$m = array_map($toUInt32, $m);
$k = array_map($toUInt32, $k);
//
// Perform NH hash on the chunks, pairing words for multiplication
// which are 4 apart to accommodate vector-parallelism.
//
$y = new BigInteger();
$y->setPrecision(64);
$i = 0;
while ($i < $t) {
$temp = $m[$i]->add($k[$i]);
$temp->setPrecision(64);
$temp = $temp->multiply($m[$i + 4]->add($k[$i + 4]));
$y = $y->add($temp);
$temp = $m[$i + 1]->add($k[$i + 1]);
$temp->setPrecision(64);
$temp = $temp->multiply($m[$i + 5]->add($k[$i + 5]));
$y = $y->add($temp);
$temp = $m[$i + 2]->add($k[$i + 2]);
$temp->setPrecision(64);
$temp = $temp->multiply($m[$i + 6]->add($k[$i + 6]));
$y = $y->add($temp);
$temp = $m[$i + 3]->add($k[$i + 3]);
$temp->setPrecision(64);
$temp = $temp->multiply($m[$i + 7]->add($k[$i + 7]));
$y = $y->add($temp);
$i += 8;
}
return $y->add($length)->toBytes();
}
/**
* L2-HASH: Second-Layer Hash
*
* The second-layer rehashes the L1-HASH output using a polynomial hash
* called POLY. If the L1-HASH output is long, then POLY is called once
* on a prefix of the L1-HASH output and called using different settings
* on the remainder. (This two-step hashing of the L1-HASH output is
* needed only if the message length is greater than 16 megabytes.)
* Careful implementation of POLY is necessary to avoid a possible
* timing attack (see Section 6.6 for more information).
*
* @param string $k string of length 24 bytes.
* @param string $m string of length less than 2^64 bytes.
* @return string string of length 16 bytes.
*/
private static function L2Hash($k, $m)
{
//
// Extract keys and restrict to special key-sets
//
$k64 = $k & "\x01\xFF\xFF\xFF\x01\xFF\xFF\xFF";
$k64 = new BigInteger($k64, 256);
$k128 = substr($k, 8) & "\x01\xFF\xFF\xFF\x01\xFF\xFF\xFF\x01\xFF\xFF\xFF\x01\xFF\xFF\xFF";
$k128 = new BigInteger($k128, 256);
//
// If M is no more than 2^17 bytes, hash under 64-bit prime,
// otherwise, hash first 2^17 bytes under 64-bit prime and
// remainder under 128-bit prime.
//
if (strlen($m) <= 0x20000) { // 2^14 64-bit words
$y = self::poly(64, self::$maxwordrange64, $k64, $m);
} else {
$m_1 = substr($m, 0, 0x20000); // 1 << 17
$m_2 = substr($m, 0x20000) . "\x80";
$length = strlen($m_2);
$pad = 16 - ($length % 16);
$pad %= 16;
$m_2 = str_pad($m_2, $length + $pad, "\0"); // zeropad
$y = self::poly(64, self::$maxwordrange64, $k64, $m_1);
$y = str_pad($y, 16, "\0", STR_PAD_LEFT);
$y = self::poly(128, self::$maxwordrange128, $k128, $y . $m_2);
}
return str_pad($y, 16, "\0", STR_PAD_LEFT);
}
/**
* POLY Algorithm
*
* @param int $wordbits the integer 64 or 128.
* @param BigInteger $maxwordrange positive integer less than 2^wordbits.
* @param BigInteger $k integer in the range 0 ... prime(wordbits) - 1.
* @param string $m string with length divisible by (wordbits / 8) bytes.
* @return integer in the range 0 ... prime(wordbits) - 1.
*/
private static function poly($wordbits, $maxwordrange, $k, $m)
{
//
// Define constants used for fixing out-of-range words
//
$wordbytes = $wordbits >> 3;
if ($wordbits == 128) {
$factory = self::$factory128;
$offset = self::$offset128;
$marker = self::$marker128;
} else {
$factory = self::$factory64;
$offset = self::$offset64;
$marker = self::$marker64;
}
$k = $factory->newInteger($k);
//
// Break M into chunks of length wordbytes bytes
//
$m_i = str_split($m, $wordbytes);
//
// Each input word m is compared with maxwordrange. If not smaller
// then 'marker' and (m - offset), both in range, are hashed.
//
$y = $factory->newInteger(new BigInteger(1));
foreach ($m_i as $m) {
$m = $factory->newInteger(new BigInteger($m, 256));
if ($m->compare($maxwordrange) >= 0) {
$y = $k->multiply($y)->add($marker);
$y = $k->multiply($y)->add($m->subtract($offset));
} else {
$y = $k->multiply($y)->add($m);
}
}
return $y->toBytes();
}
/**
* L3-HASH: Third-Layer Hash
*
* The output from L2-HASH is 16 bytes long. This final hash function
* hashes the 16-byte string to a fixed length of 4 bytes.
*
* @param string $k1 string of length 64 bytes.
* @param string $k2 string of length 4 bytes.
* @param string $m string of length 16 bytes.
* @return string string of length 4 bytes.
*/
private static function L3Hash($k1, $k2, $m)
{
$factory = self::$factory36;
$y = $factory->newInteger(new BigInteger());
for ($i = 0; $i < 8; $i++) {
$m_i = $factory->newInteger(new BigInteger(substr($m, 2 * $i, 2), 256));
$k_i = $factory->newInteger(new BigInteger(substr($k1, 8 * $i, 8), 256));
$y = $y->add($m_i->multiply($k_i));
}
$y = str_pad(substr($y->toBytes(), -4), 4, "\0", STR_PAD_LEFT);
$y = $y ^ $k2;
return $y;
}
/**
* Compute the Hash / HMAC / UMAC.
*
* @param string $text
* @return string
*/
public function hash($text)
{
$algo = $this->algo;
if ($algo == 'umac') {
if ($this->recomputeAESKey) {
if (!is_string($this->nonce)) {
throw new InsufficientSetupException('No nonce has been set');
}
if (!is_string($this->key)) {
throw new InsufficientSetupException('No key has been set');
}
if (strlen($this->key) != 16) {
throw new \LengthException('Key must be 16 bytes long');
}
if (!isset(self::$maxwordrange64)) {
$one = new BigInteger(1);
$prime36 = new BigInteger("\x00\x00\x00\x0F\xFF\xFF\xFF\xFB", 256);
self::$factory36 = new PrimeField($prime36);
$prime64 = new BigInteger("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xC5", 256);
self::$factory64 = new PrimeField($prime64);
$prime128 = new BigInteger("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x61", 256);
self::$factory128 = new PrimeField($prime128);
self::$offset64 = new BigInteger("\1\0\0\0\0\0\0\0\0", 256);
self::$offset64 = self::$factory64->newInteger(self::$offset64->subtract($prime64));
self::$offset128 = new BigInteger("\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 256);
self::$offset128 = self::$factory128->newInteger(self::$offset128->subtract($prime128));
self::$marker64 = self::$factory64->newInteger($prime64->subtract($one));
self::$marker128 = self::$factory128->newInteger($prime128->subtract($one));
$maxwordrange64 = $one->bitwise_leftShift(64)->subtract($one->bitwise_leftShift(32));
self::$maxwordrange64 = self::$factory64->newInteger($maxwordrange64);
$maxwordrange128 = $one->bitwise_leftShift(128)->subtract($one->bitwise_leftShift(96));
self::$maxwordrange128 = self::$factory128->newInteger($maxwordrange128);
}
$this->c = new AES('ctr');
$this->c->disablePadding();
$this->c->setKey($this->key);
$this->pad = $this->pdf();
$this->recomputeAESKey = false;
}
$hashedmessage = $this->uhash($text, $this->length);
return $hashedmessage ^ $this->pad;
}
if (is_array($algo)) {
if (empty($this->key) || !is_string($this->key)) {
return substr($algo($text, ...array_values($this->parameters)), 0, $this->length);
}
// SHA3 HMACs are discussed at https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf#page=30
$key = str_pad($this->computedKey, $b, chr(0));
$temp = $this->ipad ^ $key;
$temp .= $text;
$temp = substr($algo($temp, ...array_values($this->parameters)), 0, $this->length);
$output = $this->opad ^ $key;
$output .= $temp;
$output = $algo($output, ...array_values($this->parameters));
return substr($output, 0, $this->length);
}
$output = !empty($this->key) || is_string($this->key) ?
hash_hmac($algo, $text, $this->computedKey, true) :
hash($algo, $text, true);
return strlen($output) > $this->length
? substr($output, 0, $this->length)
: $output;
}
/**
* Returns the hash length (in bits)
*
* @return int
*/
public function getLength()
{
return $this->length << 3;
}
/**
* Returns the hash length (in bytes)
*
* @return int
*/
public function getLengthInBytes()
{
return $this->length;
}
/**
* Returns the block length (in bits)
*
* @return int
*/
public function getBlockLength()
{
return $this->blockSize;
}
/**
* Returns the block length (in bytes)
*
* @return int
*/
public function getBlockLengthInBytes()
{
return $this->blockSize >> 3;
}
/**
* Pads SHA3 based on the mode
*
* @param int $padLength
* @param int $padType
* @return string
*/
private static function sha3_pad($padLength, $padType)
{
switch ($padType) {
case self::PADDING_KECCAK:
$temp = chr(0x01) . str_repeat("\0", $padLength - 1);
$temp[$padLength - 1] = $temp[$padLength - 1] | chr(0x80);
return $temp;
case self::PADDING_SHAKE:
$temp = chr(0x1F) . str_repeat("\0", $padLength - 1);
$temp[$padLength - 1] = $temp[$padLength - 1] | chr(0x80);
return $temp;
//case self::PADDING_SHA3:
default:
// from https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf#page=36
return $padLength == 1 ? chr(0x86) : chr(0x06) . str_repeat("\0", $padLength - 2) . chr(0x80);
}
}
/**
* Pure-PHP 32-bit implementation of SHA3
*
* Whereas BigInteger.php's 32-bit engine works on PHP 64-bit this 32-bit implementation
* of SHA3 will *not* work on PHP 64-bit. This is because this implementation
* employees bitwise NOTs and bitwise left shifts. And the round constants only work
* on 32-bit PHP. eg. dechex(-2147483648) returns 80000000 on 32-bit PHP and
* FFFFFFFF80000000 on 64-bit PHP. Sure, we could do bitwise ANDs but that would slow
* things down.
*
* SHA512 requires BigInteger to simulate 64-bit unsigned integers because SHA2 employees
* addition whereas SHA3 just employees bitwise operators. PHP64 only supports signed
* 64-bit integers, which complicates addition, whereas that limitation isn't an issue
* for SHA3.
*
* In https://ws680.nist.gov/publication/get_pdf.cfm?pub_id=919061#page=16 KECCAK[C] is
* defined as "the KECCAK instance with KECCAK-f[1600] as the underlying permutation and
* capacity c". This is relevant because, altho the KECCAK standard defines a mode
* (KECCAK-f[800]) designed for 32-bit machines that mode is incompatible with SHA3
*
* @param string $p
* @param int $c
* @param int $r
* @param int $d
* @param int $padType
*/
private static function sha3_32($p, $c, $r, $d, $padType)
{
$block_size = $r >> 3;
$padLength = $block_size - (strlen($p) % $block_size);
$num_ints = $block_size >> 2;
$p .= static::sha3_pad($padLength, $padType);
$n = strlen($p) / $r; // number of blocks
$s = [
[[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]],
[[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]],
[[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]],
[[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]],
[[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]]
];
$p = str_split($p, $block_size);
foreach ($p as $pi) {
$pi = unpack('V*', $pi);
$x = $y = 0;
for ($i = 1; $i <= $num_ints; $i += 2) {
$s[$x][$y][0] ^= $pi[$i + 1];
$s[$x][$y][1] ^= $pi[$i];
if (++$y == 5) {
$y = 0;
$x++;
}
}
static::processSHA3Block32($s);
}
$z = '';
$i = $j = 0;
while (strlen($z) < $d) {
$z .= pack('V2', $s[$i][$j][1], $s[$i][$j++][0]);
if ($j == 5) {
$j = 0;
$i++;
if ($i == 5) {
$i = 0;
static::processSHA3Block32($s);
}
}
}
return $z;
}
/**
* 32-bit block processing method for SHA3
*
* @param array $s
*/
private static function processSHA3Block32(&$s)
{
static $rotationOffsets = [
[ 0, 1, 62, 28, 27],
[36, 44, 6, 55, 20],
[ 3, 10, 43, 25, 39],
[41, 45, 15, 21, 8],
[18, 2, 61, 56, 14]
];
// the standards give these constants in hexadecimal notation. it's tempting to want to use
// that same notation, here, however, we can't, because 0x80000000, on PHP32, is a positive
// float - not the negative int that we need to be in PHP32. so we use -2147483648 instead
static $roundConstants = [
[0, 1],
[0, 32898],
[-2147483648, 32906],
[-2147483648, -2147450880],
[0, 32907],
[0, -2147483647],
[-2147483648, -2147450751],
[-2147483648, 32777],
[0, 138],
[0, 136],
[0, -2147450871],
[0, -2147483638],
[0, -2147450741],
[-2147483648, 139],
[-2147483648, 32905],
[-2147483648, 32771],
[-2147483648, 32770],
[-2147483648, 128],
[0, 32778],
[-2147483648, -2147483638],
[-2147483648, -2147450751],
[-2147483648, 32896],
[0, -2147483647],
[-2147483648, -2147450872]
];
for ($round = 0; $round < 24; $round++) {
// theta step
$parity = $rotated = [];
for ($i = 0; $i < 5; $i++) {
$parity[] = [
$s[0][$i][0] ^ $s[1][$i][0] ^ $s[2][$i][0] ^ $s[3][$i][0] ^ $s[4][$i][0],
$s[0][$i][1] ^ $s[1][$i][1] ^ $s[2][$i][1] ^ $s[3][$i][1] ^ $s[4][$i][1]
];
$rotated[] = static::rotateLeft32($parity[$i], 1);
}
$temp = [
[$parity[4][0] ^ $rotated[1][0], $parity[4][1] ^ $rotated[1][1]],
[$parity[0][0] ^ $rotated[2][0], $parity[0][1] ^ $rotated[2][1]],
[$parity[1][0] ^ $rotated[3][0], $parity[1][1] ^ $rotated[3][1]],
[$parity[2][0] ^ $rotated[4][0], $parity[2][1] ^ $rotated[4][1]],
[$parity[3][0] ^ $rotated[0][0], $parity[3][1] ^ $rotated[0][1]]
];
for ($i = 0; $i < 5; $i++) {
for ($j = 0; $j < 5; $j++) {
$s[$i][$j][0] ^= $temp[$j][0];
$s[$i][$j][1] ^= $temp[$j][1];
}
}
$st = $s;
// rho and pi steps
for ($i = 0; $i < 5; $i++) {
for ($j = 0; $j < 5; $j++) {
$st[(2 * $i + 3 * $j) % 5][$j] = static::rotateLeft32($s[$j][$i], $rotationOffsets[$j][$i]);
}
}
// chi step
for ($i = 0; $i < 5; $i++) {
$s[$i][0] = [
$st[$i][0][0] ^ (~$st[$i][1][0] & $st[$i][2][0]),
$st[$i][0][1] ^ (~$st[$i][1][1] & $st[$i][2][1])
];
$s[$i][1] = [
$st[$i][1][0] ^ (~$st[$i][2][0] & $st[$i][3][0]),
$st[$i][1][1] ^ (~$st[$i][2][1] & $st[$i][3][1])
];
$s[$i][2] = [
$st[$i][2][0] ^ (~$st[$i][3][0] & $st[$i][4][0]),
$st[$i][2][1] ^ (~$st[$i][3][1] & $st[$i][4][1])
];
$s[$i][3] = [
$st[$i][3][0] ^ (~$st[$i][4][0] & $st[$i][0][0]),
$st[$i][3][1] ^ (~$st[$i][4][1] & $st[$i][0][1])
];
$s[$i][4] = [
$st[$i][4][0] ^ (~$st[$i][0][0] & $st[$i][1][0]),
$st[$i][4][1] ^ (~$st[$i][0][1] & $st[$i][1][1])
];
}
// iota step
$s[0][0][0] ^= $roundConstants[$round][0];
$s[0][0][1] ^= $roundConstants[$round][1];
}
}
/**
* Rotate 32-bit int
*
* @param array $x
* @param int $shift
*/
private static function rotateLeft32($x, $shift)
{
if ($shift < 32) {
list($hi, $lo) = $x;
} else {
$shift -= 32;
list($lo, $hi) = $x;
}
return [
($hi << $shift) | (($lo >> (32 - $shift)) & (1 << $shift) - 1),
($lo << $shift) | (($hi >> (32 - $shift)) & (1 << $shift) - 1)
];
}
/**
* Pure-PHP 64-bit implementation of SHA3
*
* @param string $p
* @param int $c
* @param int $r
* @param int $d
* @param int $padType
*/
private static function sha3_64($p, $c, $r, $d, $padType)
{
$block_size = $r >> 3;
$padLength = $block_size - (strlen($p) % $block_size);
$num_ints = $block_size >> 2;
$p .= static::sha3_pad($padLength, $padType);
$n = strlen($p) / $r; // number of blocks
$s = [
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0]
];
$p = str_split($p, $block_size);
foreach ($p as $pi) {
$pi = unpack('P*', $pi);
$x = $y = 0;
foreach ($pi as $subpi) {
$s[$x][$y++] ^= $subpi;
if ($y == 5) {
$y = 0;
$x++;
}
}
static::processSHA3Block64($s);
}
$z = '';
$i = $j = 0;
while (strlen($z) < $d) {
$z .= pack('P', $s[$i][$j++]);
if ($j == 5) {
$j = 0;
$i++;
if ($i == 5) {
$i = 0;
static::processSHA3Block64($s);
}
}
}
return $z;
}
/**
* 64-bit block processing method for SHA3
*
* @param array $s
*/
private static function processSHA3Block64(&$s)
{
static $rotationOffsets = [
[ 0, 1, 62, 28, 27],
[36, 44, 6, 55, 20],
[ 3, 10, 43, 25, 39],
[41, 45, 15, 21, 8],
[18, 2, 61, 56, 14]
];
static $roundConstants = [
1,
32898,
-9223372036854742902,
-9223372034707259392,
32907,
2147483649,
-9223372034707259263,
-9223372036854743031,
138,
136,
2147516425,
2147483658,
2147516555,
-9223372036854775669,
-9223372036854742903,
-9223372036854743037,
-9223372036854743038,
-9223372036854775680,
32778,
-9223372034707292150,
-9223372034707259263,
-9223372036854742912,
2147483649,
-9223372034707259384
];
for ($round = 0; $round < 24; $round++) {
// theta step
$parity = [];
for ($i = 0; $i < 5; $i++) {
$parity[] = $s[0][$i] ^ $s[1][$i] ^ $s[2][$i] ^ $s[3][$i] ^ $s[4][$i];
}
$temp = [
$parity[4] ^ static::rotateLeft64($parity[1], 1),
$parity[0] ^ static::rotateLeft64($parity[2], 1),
$parity[1] ^ static::rotateLeft64($parity[3], 1),
$parity[2] ^ static::rotateLeft64($parity[4], 1),
$parity[3] ^ static::rotateLeft64($parity[0], 1)
];
for ($i = 0; $i < 5; $i++) {
for ($j = 0; $j < 5; $j++) {
$s[$i][$j] ^= $temp[$j];
}
}
$st = $s;
// rho and pi steps
for ($i = 0; $i < 5; $i++) {
for ($j = 0; $j < 5; $j++) {
$st[(2 * $i + 3 * $j) % 5][$j] = static::rotateLeft64($s[$j][$i], $rotationOffsets[$j][$i]);
}
}
// chi step
for ($i = 0; $i < 5; $i++) {
$s[$i] = [
$st[$i][0] ^ (~$st[$i][1] & $st[$i][2]),
$st[$i][1] ^ (~$st[$i][2] & $st[$i][3]),
$st[$i][2] ^ (~$st[$i][3] & $st[$i][4]),
$st[$i][3] ^ (~$st[$i][4] & $st[$i][0]),
$st[$i][4] ^ (~$st[$i][0] & $st[$i][1])
];
}
// iota step
$s[0][0] ^= $roundConstants[$round];
}
}
/**
* Rotate 64-bit int
*
* @param int $x
* @param int $shift
*/
private static function rotateLeft64($x, $shift)
{
return ($x << $shift) | (($x >> (64 - $shift)) & ((1 << $shift) - 1));
}
/**
* Pure-PHP implementation of SHA512
*
* @param string $m
* @param array $hash
* @return string
*/
private static function sha512($m, $hash)
{
static $k;
if (!isset($k)) {
// Initialize table of round constants
// (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
$k = [
'428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
'3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
'72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
'2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
'983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
'27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
'650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
'19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
'391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
'748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
'90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
'06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
'28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
'4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
];
for ($i = 0; $i < 80; $i++) {
$k[$i] = new BigInteger($k[$i], 16);
}
}
// Pre-processing
$length = strlen($m);
// to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
$m .= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
$m[$length] = chr(0x80);
// we don't support hashing strings 512MB long
$m .= pack('N4', 0, 0, 0, $length << 3);
// Process the message in successive 1024-bit chunks
$chunks = str_split($m, 128);
foreach ($chunks as $chunk) {
$w = [];
for ($i = 0; $i < 16; $i++) {
$temp = new BigInteger(Strings::shift($chunk, 8), 256);
$temp->setPrecision(64);
$w[] = $temp;
}
// Extend the sixteen 32-bit words into eighty 32-bit words
for ($i = 16; $i < 80; $i++) {
$temp = [
$w[$i - 15]->bitwise_rightRotate(1),
$w[$i - 15]->bitwise_rightRotate(8),
$w[$i - 15]->bitwise_rightShift(7)
];
$s0 = $temp[0]->bitwise_xor($temp[1]);
$s0 = $s0->bitwise_xor($temp[2]);
$temp = [
$w[$i - 2]->bitwise_rightRotate(19),
$w[$i - 2]->bitwise_rightRotate(61),
$w[$i - 2]->bitwise_rightShift(6)
];
$s1 = $temp[0]->bitwise_xor($temp[1]);
$s1 = $s1->bitwise_xor($temp[2]);
$w[$i] = clone $w[$i - 16];
$w[$i] = $w[$i]->add($s0);
$w[$i] = $w[$i]->add($w[$i - 7]);
$w[$i] = $w[$i]->add($s1);
}
// Initialize hash value for this chunk
$a = clone $hash[0];
$b = clone $hash[1];
$c = clone $hash[2];
$d = clone $hash[3];
$e = clone $hash[4];
$f = clone $hash[5];
$g = clone $hash[6];
$h = clone $hash[7];
// Main loop
for ($i = 0; $i < 80; $i++) {
$temp = [
$a->bitwise_rightRotate(28),
$a->bitwise_rightRotate(34),
$a->bitwise_rightRotate(39)
];
$s0 = $temp[0]->bitwise_xor($temp[1]);
$s0 = $s0->bitwise_xor($temp[2]);
$temp = [
$a->bitwise_and($b),
$a->bitwise_and($c),
$b->bitwise_and($c)
];
$maj = $temp[0]->bitwise_xor($temp[1]);
$maj = $maj->bitwise_xor($temp[2]);
$t2 = $s0->add($maj);
$temp = [
$e->bitwise_rightRotate(14),
$e->bitwise_rightRotate(18),
$e->bitwise_rightRotate(41)
];
$s1 = $temp[0]->bitwise_xor($temp[1]);
$s1 = $s1->bitwise_xor($temp[2]);
$temp = [
$e->bitwise_and($f),
$g->bitwise_and($e->bitwise_not())
];
$ch = $temp[0]->bitwise_xor($temp[1]);
$t1 = $h->add($s1);
$t1 = $t1->add($ch);
$t1 = $t1->add($k[$i]);
$t1 = $t1->add($w[$i]);
$h = clone $g;
$g = clone $f;
$f = clone $e;
$e = $d->add($t1);
$d = clone $c;
$c = clone $b;
$b = clone $a;
$a = $t1->add($t2);
}
// Add this chunk's hash to result so far
$hash = [
$hash[0]->add($a),
$hash[1]->add($b),
$hash[2]->add($c),
$hash[3]->add($d),
$hash[4]->add($e),
$hash[5]->add($f),
$hash[6]->add($g),
$hash[7]->add($h)
];
}
// Produce the final hash value (big-endian)
// (\phpseclib3\Crypt\Hash::hash() trims the output for hashes but not for HMACs. as such, we trim the output here)
$temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() .
$hash[4]->toBytes() . $hash[5]->toBytes() . $hash[6]->toBytes() . $hash[7]->toBytes();
return $temp;
}
/**
* __toString() magic method
*/
public function __toString()
{
return $this->getHash();
}
}
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