ParagonIE_Sodium_Core_Salsa20::core_salsa20() public WP 1.0

Calculate an salsa20 hash of a single block

{} It's a method of the class: ParagonIE_Sodium_Core_Salsa20{}

No Hooks.

Return

String.

Usage

$result = ParagonIE_Sodium_Core_Salsa20::core_salsa20( $in, $k, $c );

$in(string) (required)

-

$k(string) (required)

-

Default: null

Code of ParagonIE_Sodium_Core_Salsa20::core_salsa20() ParagonIE Sodium Core Salsa20::core salsa20 ^{WP 5.8.3}

public static function core_salsa20($in, $k, $c = null)
{
    if (self::strlen($k) < 32) {
        throw new RangeException('Key must be 32 bytes long');
    }
    if ($c === null) {
        $j0  = $x0  = 0x61707865;
        $j5  = $x5  = 0x3320646e;
        $j10 = $x10 = 0x79622d32;
        $j15 = $x15 = 0x6b206574;
    } else {
        $j0  = $x0  = self::load_4(self::substr($c, 0, 4));
        $j5  = $x5  = self::load_4(self::substr($c, 4, 4));
        $j10 = $x10 = self::load_4(self::substr($c, 8, 4));
        $j15 = $x15 = self::load_4(self::substr($c, 12, 4));
    }
    $j1  = $x1  = self::load_4(self::substr($k, 0, 4));
    $j2  = $x2  = self::load_4(self::substr($k, 4, 4));
    $j3  = $x3  = self::load_4(self::substr($k, 8, 4));
    $j4  = $x4  = self::load_4(self::substr($k, 12, 4));
    $j6  = $x6  = self::load_4(self::substr($in, 0, 4));
    $j7  = $x7  = self::load_4(self::substr($in, 4, 4));
    $j8  = $x8  = self::load_4(self::substr($in, 8, 4));
    $j9  = $x9  = self::load_4(self::substr($in, 12, 4));
    $j11 = $x11 = self::load_4(self::substr($k, 16, 4));
    $j12 = $x12 = self::load_4(self::substr($k, 20, 4));
    $j13 = $x13 = self::load_4(self::substr($k, 24, 4));
    $j14 = $x14 = self::load_4(self::substr($k, 28, 4));

    for ($i = self::ROUNDS; $i > 0; $i -= 2) {
        $x4 ^= self::rotate($x0 + $x12, 7);
        $x8 ^= self::rotate($x4 + $x0, 9);
        $x12 ^= self::rotate($x8 + $x4, 13);
        $x0 ^= self::rotate($x12 + $x8, 18);

        $x9 ^= self::rotate($x5 + $x1, 7);
        $x13 ^= self::rotate($x9 + $x5, 9);
        $x1 ^= self::rotate($x13 + $x9, 13);
        $x5 ^= self::rotate($x1 + $x13, 18);

        $x14 ^= self::rotate($x10 + $x6, 7);
        $x2 ^= self::rotate($x14 + $x10, 9);
        $x6 ^= self::rotate($x2 + $x14, 13);
        $x10 ^= self::rotate($x6 + $x2, 18);

        $x3 ^= self::rotate($x15 + $x11, 7);
        $x7 ^= self::rotate($x3 + $x15, 9);
        $x11 ^= self::rotate($x7 + $x3, 13);
        $x15 ^= self::rotate($x11 + $x7, 18);

        $x1 ^= self::rotate($x0 + $x3, 7);
        $x2 ^= self::rotate($x1 + $x0, 9);
        $x3 ^= self::rotate($x2 + $x1, 13);
        $x0 ^= self::rotate($x3 + $x2, 18);

        $x6 ^= self::rotate($x5 + $x4, 7);
        $x7 ^= self::rotate($x6 + $x5, 9);
        $x4 ^= self::rotate($x7 + $x6, 13);
        $x5 ^= self::rotate($x4 + $x7, 18);

        $x11 ^= self::rotate($x10 + $x9, 7);
        $x8 ^= self::rotate($x11 + $x10, 9);
        $x9 ^= self::rotate($x8 + $x11, 13);
        $x10 ^= self::rotate($x9 + $x8, 18);

        $x12 ^= self::rotate($x15 + $x14, 7);
        $x13 ^= self::rotate($x12 + $x15, 9);
        $x14 ^= self::rotate($x13 + $x12, 13);
        $x15 ^= self::rotate($x14 + $x13, 18);
    }

    $x0  += $j0;
    $x1  += $j1;
    $x2  += $j2;
    $x3  += $j3;
    $x4  += $j4;
    $x5  += $j5;
    $x6  += $j6;
    $x7  += $j7;
    $x8  += $j8;
    $x9  += $j9;
    $x10 += $j10;
    $x11 += $j11;
    $x12 += $j12;
    $x13 += $j13;
    $x14 += $j14;
    $x15 += $j15;

    return self::store32_le($x0) .
        self::store32_le($x1) .
        self::store32_le($x2) .
        self::store32_le($x3) .
        self::store32_le($x4) .
        self::store32_le($x5) .
        self::store32_le($x6) .
        self::store32_le($x7) .
        self::store32_le($x8) .
        self::store32_le($x9) .
        self::store32_le($x10) .
        self::store32_le($x11) .
        self::store32_le($x12) .
        self::store32_le($x13) .
        self::store32_le($x14) .
        self::store32_le($x15);
}