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Viewing: SipHash.php
<?php
if (class_exists('ParagonIE_Sodium_Core_SipHash', false)) {
return;
}
/**
* Class ParagonIE_SodiumCompat_Core_SipHash
*
* Only uses 32-bit arithmetic, while the original SipHash used 64-bit integers
*/
class ParagonIE_Sodium_Core_SipHash extends ParagonIE_Sodium_Core_Util
{
/**
* @internal You should not use this directly from another application
*
* @param int[] $v
* @return int[]
*
*/
public static function sipRound(array $v)
{
# v0 += v1;
list($v[0], $v[1]) = self::add(
array($v[0], $v[1]),
array($v[2], $v[3])
);
# v1=ROTL(v1,13);
list($v[2], $v[3]) = self::rotl_64((int) $v[2], (int) $v[3], 13);
# v1 ^= v0;
$v[2] = (int) $v[2] ^ (int) $v[0];
$v[3] = (int) $v[3] ^ (int) $v[1];
# v0=ROTL(v0,32);
list($v[0], $v[1]) = self::rotl_64((int) $v[0], (int) $v[1], 32);
# v2 += v3;
list($v[4], $v[5]) = self::add(
array((int) $v[4], (int) $v[5]),
array((int) $v[6], (int) $v[7])
);
# v3=ROTL(v3,16);
list($v[6], $v[7]) = self::rotl_64((int) $v[6], (int) $v[7], 16);
# v3 ^= v2;
$v[6] = (int) $v[6] ^ (int) $v[4];
$v[7] = (int) $v[7] ^ (int) $v[5];
# v0 += v3;
list($v[0], $v[1]) = self::add(
array((int) $v[0], (int) $v[1]),
array((int) $v[6], (int) $v[7])
);
# v3=ROTL(v3,21);
list($v[6], $v[7]) = self::rotl_64((int) $v[6], (int) $v[7], 21);
# v3 ^= v0;
$v[6] = (int) $v[6] ^ (int) $v[0];
$v[7] = (int) $v[7] ^ (int) $v[1];
# v2 += v1;
list($v[4], $v[5]) = self::add(
array((int) $v[4], (int) $v[5]),
array((int) $v[2], (int) $v[3])
);
# v1=ROTL(v1,17);
list($v[2], $v[3]) = self::rotl_64((int) $v[2], (int) $v[3], 17);
# v1 ^= v2;;
$v[2] = (int) $v[2] ^ (int) $v[4];
$v[3] = (int) $v[3] ^ (int) $v[5];
# v2=ROTL(v2,32)
list($v[4], $v[5]) = self::rotl_64((int) $v[4], (int) $v[5], 32);
return $v;
}
/**
* Add two 32 bit integers representing a 64-bit integer.
*
* @internal You should not use this directly from another application
*
* @param int[] $a
* @param int[] $b
* @return array<int, mixed>
*/
public static function add(array $a, array $b)
{
/** @var int $x1 */
$x1 = $a[1] + $b[1];
/** @var int $c */
$c = $x1 >> 32; // Carry if ($a + $b) > 0xffffffff
/** @var int $x0 */
$x0 = $a[0] + $b[0] + $c;
return array(
$x0 & 0xffffffff,
$x1 & 0xffffffff
);
}
/**
* @internal You should not use this directly from another application
*
* @param int $int0
* @param int $int1
* @param int $c
* @return array<int, mixed>
*/
public static function rotl_64($int0, $int1, $c)
{
$int0 &= 0xffffffff;
$int1 &= 0xffffffff;
$c &= 63;
if ($c === 32) {
return array($int1, $int0);
}
if ($c > 31) {
$tmp = $int1;
$int1 = $int0;
$int0 = $tmp;
$c &= 31;
}
if ($c === 0) {
return array($int0, $int1);
}
return array(
0xffffffff & (
($int0 << $c)
|
($int1 >> (32 - $c))
),
0xffffffff & (
($int1 << $c)
|
($int0 >> (32 - $c))
),
);
}
/**
* Implements Siphash-2-4 using only 32-bit numbers.
*
* When we split an int into two, the higher bits go to the lower index.
* e.g. 0xDEADBEEFAB10C92D becomes [
* 0 => 0xDEADBEEF,
* 1 => 0xAB10C92D
* ].
*
* @internal You should not use this directly from another application
*
* @param string $in
* @param string $key
* @return string
* @throws SodiumException
* @throws TypeError
*/
public static function sipHash24($in, $key)
{
$inlen = self::strlen($in);
# /* "somepseudorandomlygeneratedbytes" */
# u64 v0 = 0x736f6d6570736575ULL;
# u64 v1 = 0x646f72616e646f6dULL;
# u64 v2 = 0x6c7967656e657261ULL;
# u64 v3 = 0x7465646279746573ULL;
$v = array(
0x736f6d65, // 0
0x70736575, // 1
0x646f7261, // 2
0x6e646f6d, // 3
0x6c796765, // 4
0x6e657261, // 5
0x74656462, // 6
0x79746573 // 7
);
// v0 => $v[0], $v[1]
// v1 => $v[2], $v[3]
// v2 => $v[4], $v[5]
// v3 => $v[6], $v[7]
# u64 k0 = LOAD64_LE( k );
# u64 k1 = LOAD64_LE( k + 8 );
$k = array(
self::load_4(self::substr($key, 4, 4)),
self::load_4(self::substr($key, 0, 4)),
self::load_4(self::substr($key, 12, 4)),
self::load_4(self::substr($key, 8, 4))
);
// k0 => $k[0], $k[1]
// k1 => $k[2], $k[3]
# b = ( ( u64 )inlen ) << 56;
$b = array(
$inlen << 24,
0
);
// See docblock for why the 0th index gets the higher bits.
# v3 ^= k1;
$v[6] ^= $k[2];
$v[7] ^= $k[3];
# v2 ^= k0;
$v[4] ^= $k[0];
$v[5] ^= $k[1];
# v1 ^= k1;
$v[2] ^= $k[2];
$v[3] ^= $k[3];
# v0 ^= k0;
$v[0] ^= $k[0];
$v[1] ^= $k[1];
$left = $inlen;
# for ( ; in != end; in += 8 )
while ($left >= 8) {
# m = LOAD64_LE( in );
$m = array(
self::load_4(self::substr($in, 4, 4)),
self::load_4(self::substr($in, 0, 4))
);
# v3 ^= m;
$v[6] ^= $m[0];
$v[7] ^= $m[1];
# SIPROUND;
# SIPROUND;
$v = self::sipRound($v);
$v = self::sipRound($v);
# v0 ^= m;
$v[0] ^= $m[0];
$v[1] ^= $m[1];
$in = self::substr($in, 8);
$left -= 8;
}
# switch( left )
# {
# case 7: b |= ( ( u64 )in[ 6] ) << 48;
# case 6: b |= ( ( u64 )in[ 5] ) << 40;
# case 5: b |= ( ( u64 )in[ 4] ) << 32;
# case 4: b |= ( ( u64 )in[ 3] ) << 24;
# case 3: b |= ( ( u64 )in[ 2] ) << 16;
# case 2: b |= ( ( u64 )in[ 1] ) << 8;
# case 1: b |= ( ( u64 )in[ 0] ); break;
# case 0: break;
# }
switch ($left) {
case 7:
$b[0] |= self::chrToInt($in[6]) << 16;
case 6:
$b[0] |= self::chrToInt($in[5]) << 8;
case 5:
$b[0] |= self::chrToInt($in[4]);
case 4:
$b[1] |= self::chrToInt($in[3]) << 24;
case 3:
$b[1] |= self::chrToInt($in[2]) << 16;
case 2:
$b[1] |= self::chrToInt($in[1]) << 8;
case 1:
$b[1] |= self::chrToInt($in[0]);
case 0:
break;
}
// See docblock for why the 0th index gets the higher bits.
# v3 ^= b;
$v[6] ^= $b[0];
$v[7] ^= $b[1];
# SIPROUND;
# SIPROUND;
$v = self::sipRound($v);
$v = self::sipRound($v);
# v0 ^= b;
$v[0] ^= $b[0];
$v[1] ^= $b[1];
// Flip the lower 8 bits of v2 which is ($v[4], $v[5]) in our implementation
# v2 ^= 0xff;
$v[5] ^= 0xff;
# SIPROUND;
# SIPROUND;
# SIPROUND;
# SIPROUND;
$v = self::sipRound($v);
$v = self::sipRound($v);
$v = self::sipRound($v);
$v = self::sipRound($v);
# b = v0 ^ v1 ^ v2 ^ v3;
# STORE64_LE( out, b );
return self::store32_le($v[1] ^ $v[3] ^ $v[5] ^ $v[7]) .
self::store32_le($v[0] ^ $v[2] ^ $v[4] ^ $v[6]);
}
}
Disabled functions: None