# ParagonIE_Sodium_Core_SipHash{} │ WP 1.0

Class ParagonIE_SodiumCompat_Core_SipHash

Only uses 32-bit arithmetic, while the original SipHash used 64-bit integers

Хуков нет.

### Использование

```\$ParagonIE_Sodium_Core_SipHash = new ParagonIE_Sodium_Core_SipHash();
// use class methods```

### Методы

1. public static add(array \$a, array \$b)
2. public static rotl_64(\$int0, \$int1, \$c)
3. public static sipHash24(\$in, \$key)
4. public static sipRound(array \$v)

### Код ParagonIE_Sodium_Core_SipHash{} ParagonIE Sodium Core SipHash{} WP 6.0.1

```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;
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;
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;
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;
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.
*     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(
);
// 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(
);

# 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]);
}
}```