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File: src/Core32/SipHash.php

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File: src/Core32/SipHash.php
Role: Class source
Content type: text/plain
Description: Class source
Class: PHP Sodium Compat
Cryptographic functions of libsodium in pure PHP
Author: By
Last change: Boyscouting (docblocks, dead code removal)
Date: 26 days ago
Size: 6,613 bytes
 

Contents

Class file image Download
<?php

if (class_exists('ParagonIE_Sodium_Core32_SipHash', false)) {
    return;
}

/**
 * Class ParagonIE_SodiumCompat_Core32_SipHash
 *
 * Only uses 32-bit arithmetic, while the original SipHash used 64-bit integers
 */
class ParagonIE_Sodium_Core32_SipHash extends ParagonIE_Sodium_Core32_Util
{
   
/**
     * @internal You should not use this directly from another application
     *
     * @param array<int, ParagonIE_Sodium_Core32_Int64> $v
     * @return array<int, ParagonIE_Sodium_Core32_Int64>
     */
   
public static function sipRound(array $v)
    {
       
# v0 += v1;
       
$v[0] = $v[0]->addInt64($v[1]);

       
# v1 = ROTL(v1, 13);
       
$v[1] = $v[1]->rotateLeft(13);

       
# v1 ^= v0;
       
$v[1] = $v[1]->xorInt64($v[0]);

       
# v0=ROTL(v0,32);
       
$v[0] = $v[0]->rotateLeft(32);

       
# v2 += v3;
       
$v[2] = $v[2]->addInt64($v[3]);

       
# v3=ROTL(v3,16);
       
$v[3] = $v[3]->rotateLeft(16);

       
# v3 ^= v2;
       
$v[3] = $v[3]->xorInt64($v[2]);

       
# v0 += v3;
       
$v[0] = $v[0]->addInt64($v[3]);

       
# v3=ROTL(v3,21);
       
$v[3] = $v[3]->rotateLeft(21);

       
# v3 ^= v0;
       
$v[3] = $v[3]->xorInt64($v[0]);

       
# v2 += v1;
       
$v[2] = $v[2]->addInt64($v[1]);

       
# v1=ROTL(v1,17);
       
$v[1] = $v[1]->rotateLeft(17);

       
# v1 ^= v2;
       
$v[1] = $v[1]->xorInt64($v[2]);

       
# v2=ROTL(v2,32)
       
$v[2] = $v[2]->rotateLeft(32);

        return
$v;
    }

   
/**
     * @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(
            new
ParagonIE_Sodium_Core32_Int64(
                array(
0x736f, 0x6d65, 0x7073, 0x6575)
            ),
            new
ParagonIE_Sodium_Core32_Int64(
                array(
0x646f, 0x7261, 0x6e64, 0x6f6d)
            ),
            new
ParagonIE_Sodium_Core32_Int64(
                array(
0x6c79, 0x6765, 0x6e65, 0x7261)
            ),
            new
ParagonIE_Sodium_Core32_Int64(
                array(
0x7465, 0x6462, 0x7974, 0x6573)
            )
        );

       
# u64 k0 = LOAD64_LE( k );
        # u64 k1 = LOAD64_LE( k + 8 );
       
$k = array(
           
ParagonIE_Sodium_Core32_Int64::fromReverseString(
               
self::substr($key, 0, 8)
            ),
           
ParagonIE_Sodium_Core32_Int64::fromReverseString(
               
self::substr($key, 8, 8)
            )
        );

       
# b = ( ( u64 )inlen ) << 56;
       
$b = new ParagonIE_Sodium_Core32_Int64(
            array((
$inlen << 8) & 0xffff, 0, 0, 0)
        );

       
# v3 ^= k1;
       
$v[3] = $v[3]->xorInt64($k[1]);
       
# v2 ^= k0;
       
$v[2] = $v[2]->xorInt64($k[0]);
       
# v1 ^= k1;
       
$v[1] = $v[1]->xorInt64($k[1]);
       
# v0 ^= k0;
       
$v[0] = $v[0]->xorInt64($k[0]);

       
$left = $inlen;
       
# for ( ; in != end; in += 8 )
       
while ($left >= 8) {
           
# m = LOAD64_LE( in );
           
$m = ParagonIE_Sodium_Core32_Int64::fromReverseString(
               
self::substr($in, 0, 8)
            );

           
# v3 ^= m;
           
$v[3] = $v[3]->xorInt64($m);

           
# SIPROUND;
            # SIPROUND;
           
$v = self::sipRound($v);
           
$v = self::sipRound($v);

           
# v0 ^= m;
           
$v[0] = $v[0]->xorInt64($m);

           
$in = self::substr($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 = $b->orInt64(
                   
ParagonIE_Sodium_Core32_Int64::fromInts(
                       
0, self::chrToInt($in[6]) << 16
                   
)
                );
            case
6:
               
$b = $b->orInt64(
                   
ParagonIE_Sodium_Core32_Int64::fromInts(
                       
0, self::chrToInt($in[5]) << 8
                   
)
                );
            case
5:
               
$b = $b->orInt64(
                   
ParagonIE_Sodium_Core32_Int64::fromInts(
                       
0, self::chrToInt($in[4])
                    )
                );
            case
4:
               
$b = $b->orInt64(
                   
ParagonIE_Sodium_Core32_Int64::fromInts(
                       
self::chrToInt($in[3]) << 24, 0
                   
)
                );
            case
3:
               
$b = $b->orInt64(
                   
ParagonIE_Sodium_Core32_Int64::fromInts(
                       
self::chrToInt($in[2]) << 16, 0
                   
)
                );
            case
2:
               
$b = $b->orInt64(
                   
ParagonIE_Sodium_Core32_Int64::fromInts(
                       
self::chrToInt($in[1]) << 8, 0
                   
)
                );
            case
1:
               
$b = $b->orInt64(
                   
ParagonIE_Sodium_Core32_Int64::fromInts(
                       
self::chrToInt($in[0]), 0
                   
)
                );
            case
0:
                break;
        }

       
# v3 ^= b;
       
$v[3] = $v[3]->xorInt64($b);

       
# SIPROUND;
        # SIPROUND;
       
$v = self::sipRound($v);
       
$v = self::sipRound($v);

       
# v0 ^= b;
       
$v[0] = $v[0]->xorInt64($b);

       
// Flip the lower 8 bits of v2 which is ($v[4], $v[5]) in our implementation
        # v2 ^= 0xff;
       
$v[2]->limbs[3] ^= 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 $v[0]
            ->
xorInt64($v[1])
            ->
xorInt64($v[2])
            ->
xorInt64($v[3])
            ->
toReverseString();
    }
}