ParagonIE_Sodium_Core_Ristretto255::ristretto255_from_hash( string $h ): string

329    public static function ristretto255_from_hash($h)330    {331        if (self::strlen($h) !== 64) {332            throw new SodiumException('Hash must be 64 bytes');333        }334        //fe25519_frombytes(r0, h);335        //fe25519_frombytes(r1, h + 32);336        $r0 = self::fe_frombytes(self::substr($h, 0, 32));337        $r1 = self::fe_frombytes(self::substr($h, 32, 32));338 339        //ristretto255_elligator(&p0, r0);340        //ristretto255_elligator(&p1, r1);341        $p0 = self::ristretto255_elligator($r0);342        $p1 = self::ristretto255_elligator($r1);343 344        //ge25519_p3_to_cached(&p1_cached, &p1);345        //ge25519_add_cached(&p_p1p1, &p0, &p1_cached);346        $p_p1p1 = self::ge_add(347            $p0,348            self::ge_p3_to_cached($p1)349        );350 351        //ge25519_p1p1_to_p3(&p, &p_p1p1);352        //ristretto255_p3_tobytes(s, &p);353        return self::ristretto255_p3_tobytes(354            self::ge_p1p1_to_p3($p_p1p1)355        );356    }