ParagonIE_Sodium_Core_BLAKE2b::rotr64( SplFixedArray $x, int $c ): SplFixedArray

157    public static function rotr64($x, $c)158    {159        if (PHP_INT_SIZE === 4) {160            throw new SodiumException("Error, use 32-bit");161        }162        if ($c >= 64) {163            $c %= 64;164        }165        if ($c >= 32) {166            /** @var int $tmp */167            $tmp = $x[0];168            $x[0] = $x[1];169            $x[1] = $tmp;170            $c -= 32;171        }172        if ($c === 0) {173            return $x;174        }175 176        $l0 = 0;177        $c = 64 - $c;178 179        /** @var int $c */180        if ($c < 32) {181            $h0 = ((int) ($x[0]) << $c) | (182                (183                    (int) ($x[1]) & ((1 << $c) - 1)184                        <<185                    (32 - $c)186                ) >> (32 - $c)187            );188            $l0 = (int) ($x[1]) << $c;189        } else {190            $h0 = (int) ($x[1]) << ($c - 32);191        }192 193        $h1 = 0;194        $c1 = 64 - $c;195 196        if ($c1 < 32) {197            $h1 = (int) ($x[0]) >> $c1;198            $l1 = ((int) ($x[1]) >> $c1) | ((int) ($x[0]) & ((1 << $c1) - 1)) << (32 - $c1);199        } else {200            $l1 = (int) ($x[0]) >> ($c1 - 32);201        }202 203        return self::new64($h0 | $h1, $l0 | $l1);204    }