<?php

if (class_exists('ParagonIE_Sodium_Core32_X25519', false)) {

    return;

}

/**

 * Class ParagonIE_Sodium_Core32_X25519

 */

abstract class ParagonIE_Sodium_Core32_X25519 extends ParagonIE_Sodium_Core32_Curve25519

{

    /**

     * Alters the objects passed to this method in place.

     *

     * @internal You should not use this directly from another application

     *

     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f

     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $g

     * @param int $b

     * @return void

     * @throws SodiumException

     * @throws TypeError

     * @psalm-suppress MixedMethodCall

     */

    public static function fe_cswap(

        ParagonIE_Sodium_Core32_Curve25519_Fe $f,

        ParagonIE_Sodium_Core32_Curve25519_Fe $g,

        $b = 0

    ) {

        $f0 = (int) $f[0]->toInt();

        $f1 = (int) $f[1]->toInt();

        $f2 = (int) $f[2]->toInt();

        $f3 = (int) $f[3]->toInt();

        $f4 = (int) $f[4]->toInt();

        $f5 = (int) $f[5]->toInt();

        $f6 = (int) $f[6]->toInt();

        $f7 = (int) $f[7]->toInt();

        $f8 = (int) $f[8]->toInt();

        $f9 = (int) $f[9]->toInt();

        $g0 = (int) $g[0]->toInt();

        $g1 = (int) $g[1]->toInt();

        $g2 = (int) $g[2]->toInt();

        $g3 = (int) $g[3]->toInt();

        $g4 = (int) $g[4]->toInt();

        $g5 = (int) $g[5]->toInt();

        $g6 = (int) $g[6]->toInt();

        $g7 = (int) $g[7]->toInt();

        $g8 = (int) $g[8]->toInt();

        $g9 = (int) $g[9]->toInt();

        $b = -$b;

        /** @var int $x0 */

        $x0 = ($f0 ^ $g0) & $b;

        /** @var int $x1 */

        $x1 = ($f1 ^ $g1) & $b;

        /** @var int $x2 */

        $x2 = ($f2 ^ $g2) & $b;

        /** @var int $x3 */

        $x3 = ($f3 ^ $g3) & $b;

        /** @var int $x4 */

        $x4 = ($f4 ^ $g4) & $b;

        /** @var int $x5 */

        $x5 = ($f5 ^ $g5) & $b;

        /** @var int $x6 */

        $x6 = ($f6 ^ $g6) & $b;

        /** @var int $x7 */

        $x7 = ($f7 ^ $g7) & $b;

        /** @var int $x8 */

        $x8 = ($f8 ^ $g8) & $b;

        /** @var int $x9 */

        $x9 = ($f9 ^ $g9) & $b;

        $f[0] = ParagonIE_Sodium_Core32_Int32::fromInt($f0 ^ $x0);

        $f[1] = ParagonIE_Sodium_Core32_Int32::fromInt($f1 ^ $x1);

        $f[2] = ParagonIE_Sodium_Core32_Int32::fromInt($f2 ^ $x2);

        $f[3] = ParagonIE_Sodium_Core32_Int32::fromInt($f3 ^ $x3);

        $f[4] = ParagonIE_Sodium_Core32_Int32::fromInt($f4 ^ $x4);

        $f[5] = ParagonIE_Sodium_Core32_Int32::fromInt($f5 ^ $x5);

        $f[6] = ParagonIE_Sodium_Core32_Int32::fromInt($f6 ^ $x6);

        $f[7] = ParagonIE_Sodium_Core32_Int32::fromInt($f7 ^ $x7);

        $f[8] = ParagonIE_Sodium_Core32_Int32::fromInt($f8 ^ $x8);

        $f[9] = ParagonIE_Sodium_Core32_Int32::fromInt($f9 ^ $x9);

        $g[0] = ParagonIE_Sodium_Core32_Int32::fromInt($g0 ^ $x0);

        $g[1] = ParagonIE_Sodium_Core32_Int32::fromInt($g1 ^ $x1);

        $g[2] = ParagonIE_Sodium_Core32_Int32::fromInt($g2 ^ $x2);

        $g[3] = ParagonIE_Sodium_Core32_Int32::fromInt($g3 ^ $x3);

        $g[4] = ParagonIE_Sodium_Core32_Int32::fromInt($g4 ^ $x4);

        $g[5] = ParagonIE_Sodium_Core32_Int32::fromInt($g5 ^ $x5);

        $g[6] = ParagonIE_Sodium_Core32_Int32::fromInt($g6 ^ $x6);

        $g[7] = ParagonIE_Sodium_Core32_Int32::fromInt($g7 ^ $x7);

        $g[8] = ParagonIE_Sodium_Core32_Int32::fromInt($g8 ^ $x8);

        $g[9] = ParagonIE_Sodium_Core32_Int32::fromInt($g9 ^ $x9);

    }

    /**

     * @internal You should not use this directly from another application

     *

     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f

     * @return ParagonIE_Sodium_Core32_Curve25519_Fe

     * @throws SodiumException

     * @throws TypeError

     * @psalm-suppress MixedAssignment

     * @psalm-suppress MixedMethodCall

     */

    public static function fe_mul121666(ParagonIE_Sodium_Core32_Curve25519_Fe $f)

    {

        /** @var array<int, ParagonIE_Sodium_Core32_Int64> $h */

        $h = array();

        for ($i = 0; $i < 10; ++$i) {

            $h[$i] = $f[$i]->toInt64()->mulInt(121666, 17);

        }

        $carry9 = $h[9]->addInt(1 << 24)->shiftRight(25);

        $h[0] = $h[0]->addInt64($carry9->mulInt(19, 5));

        $h[9] = $h[9]->subInt64($carry9->shiftLeft(25));

        $carry1 = $h[1]->addInt(1 << 24)->shiftRight(25);

        $h[2] = $h[2]->addInt64($carry1);

        $h[1] = $h[1]->subInt64($carry1->shiftLeft(25));

        $carry3 = $h[3]->addInt(1 << 24)->shiftRight(25);

        $h[4] = $h[4]->addInt64($carry3);

        $h[3] = $h[3]->subInt64($carry3->shiftLeft(25));

        $carry5 = $h[5]->addInt(1 << 24)->shiftRight(25);

        $h[6] = $h[6]->addInt64($carry5);

        $h[5] = $h[5]->subInt64($carry5->shiftLeft(25));

        $carry7 = $h[7]->addInt(1 << 24)->shiftRight(25);

        $h[8] = $h[8]->addInt64($carry7);

        $h[7] = $h[7]->subInt64($carry7->shiftLeft(25));

        $carry0 = $h[0]->addInt(1 << 25)->shiftRight(26);

        $h[1] = $h[1]->addInt64($carry0);

        $h[0] = $h[0]->subInt64($carry0->shiftLeft(26));

        $carry2 = $h[2]->addInt(1 << 25)->shiftRight(26);

        $h[3] = $h[3]->addInt64($carry2);

        $h[2] = $h[2]->subInt64($carry2->shiftLeft(26));

        $carry4 = $h[4]->addInt(1 << 25)->shiftRight(26);

        $h[5] = $h[5]->addInt64($carry4);

        $h[4] = $h[4]->subInt64($carry4->shiftLeft(26));

        $carry6 = $h[6]->addInt(1 << 25)->shiftRight(26);

        $h[7] = $h[7]->addInt64($carry6);

        $h[6] = $h[6]->subInt64($carry6->shiftLeft(26));

        $carry8 = $h[8]->addInt(1 << 25)->shiftRight(26);

        $h[9] = $h[9]->addInt64($carry8);

        $h[8] = $h[8]->subInt64($carry8->shiftLeft(26));

        for ($i = 0; $i < 10; ++$i) {

            $h[$i] = $h[$i]->toInt32();

        }

        /** @var array<int, ParagonIE_Sodium_Core32_Int32> $h2 */

        $h2 = $h;

        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray($h2);

    }

    /**

     * @internal You should not use this directly from another application

     *

     * Inline comments preceded by # are from libsodium's ref10 code.

     *

     * @param string $n

     * @param string $p

     * @return string

     * @throws SodiumException

     * @throws TypeError

     */

    public static function crypto_scalarmult_curve25519_ref10($n, $p)

    {

        # for (i = 0;i < 32;++i) e[i] = n[i];

        $e = '' . $n;

        # e[0] &= 248;

        $e[0] = self::intToChr(

            self::chrToInt($e[0]) & 248

        );

        # e[31] &= 127;

        # e[31] |= 64;

        $e[31] = self::intToChr(

            (self::chrToInt($e[31]) & 127) | 64

        );

        # fe_frombytes(x1,p);

        $x1 = self::fe_frombytes($p);

        # fe_1(x2);

        $x2 = self::fe_1();

        # fe_0(z2);

        $z2 = self::fe_0();

        # fe_copy(x3,x1);

        $x3 = self::fe_copy($x1);

        # fe_1(z3);

        $z3 = self::fe_1();

        # swap = 0;

        /** @var int $swap */

        $swap = 0;

        # for (pos = 254;pos >= 0;--pos) {

        for ($pos = 254; $pos >= 0; --$pos) {

            # b = e[pos / 8] >> (pos & 7);

            /** @var int $b */

            $b = self::chrToInt(

                    $e[(int) floor($pos / 8)]

                ) >> ($pos & 7);

            # b &= 1;

            $b &= 1;

            # swap ^= b;

            $swap ^= $b;

            # fe_cswap(x2,x3,swap);

            self::fe_cswap($x2, $x3, $swap);

            # fe_cswap(z2,z3,swap);

            self::fe_cswap($z2, $z3, $swap);

            # swap = b;

            /** @var int $swap */

            $swap = $b;

            # fe_sub(tmp0,x3,z3);

            $tmp0 = self::fe_sub($x3, $z3);

            # fe_sub(tmp1,x2,z2);

            $tmp1 = self::fe_sub($x2, $z2);

            # fe_add(x2,x2,z2);

            $x2 = self::fe_add($x2, $z2);

            # fe_add(z2,x3,z3);

            $z2 = self::fe_add($x3, $z3);

            # fe_mul(z3,tmp0,x2);

            $z3 = self::fe_mul($tmp0, $x2);

            # fe_mul(z2,z2,tmp1);

            $z2 = self::fe_mul($z2, $tmp1);

            # fe_sq(tmp0,tmp1);

            $tmp0 = self::fe_sq($tmp1);

            # fe_sq(tmp1,x2);

            $tmp1 = self::fe_sq($x2);

            # fe_add(x3,z3,z2);

            $x3 = self::fe_add($z3, $z2);

            # fe_sub(z2,z3,z2);

            $z2 = self::fe_sub($z3, $z2);

            # fe_mul(x2,tmp1,tmp0);

            $x2 = self::fe_mul($tmp1, $tmp0);

            # fe_sub(tmp1,tmp1,tmp0);

            $tmp1 = self::fe_sub($tmp1, $tmp0);

            # fe_sq(z2,z2);

            $z2 = self::fe_sq($z2);

            # fe_mul121666(z3,tmp1);

            $z3 = self::fe_mul121666($tmp1);

            # fe_sq(x3,x3);

            $x3 = self::fe_sq($x3);

            # fe_add(tmp0,tmp0,z3);

            $tmp0 = self::fe_add($tmp0, $z3);

            # fe_mul(z3,x1,z2);

            $z3 = self::fe_mul($x1, $z2);

            # fe_mul(z2,tmp1,tmp0);

            $z2 = self::fe_mul($tmp1, $tmp0);

        }

        # fe_cswap(x2,x3,swap);

        self::fe_cswap($x2, $x3, $swap);

        # fe_cswap(z2,z3,swap);

        self::fe_cswap($z2, $z3, $swap);

        # fe_invert(z2,z2);

        $z2 = self::fe_invert($z2);

        # fe_mul(x2,x2,z2);

        $x2 = self::fe_mul($x2, $z2);

        # fe_tobytes(q,x2);

        return (string) self::fe_tobytes($x2);

    }

    /**

     * @internal You should not use this directly from another application

     *

     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $edwardsY

     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $edwardsZ

     * @return ParagonIE_Sodium_Core32_Curve25519_Fe

     * @throws SodiumException

     * @throws TypeError

     */

    public static function edwards_to_montgomery(

        ParagonIE_Sodium_Core32_Curve25519_Fe $edwardsY,

        ParagonIE_Sodium_Core32_Curve25519_Fe $edwardsZ

    ) {

        $tempX = self::fe_add($edwardsZ, $edwardsY);

        $tempZ = self::fe_sub($edwardsZ, $edwardsY);

        $tempZ = self::fe_invert($tempZ);

        return self::fe_mul($tempX, $tempZ);

    }

    /**

     * @internal You should not use this directly from another application

     *

     * @param string $n

     * @return string

     * @throws SodiumException

     * @throws TypeError

     */

    public static function crypto_scalarmult_curve25519_ref10_base($n)

    {

        # for (i = 0;i < 32;++i) e[i] = n[i];

        $e = '' . $n;

        # e[0] &= 248;

        $e[0] = self::intToChr(

            self::chrToInt($e[0]) & 248

        );

        # e[31] &= 127;

        # e[31] |= 64;

        $e[31] = self::intToChr(

            (self::chrToInt($e[31]) & 127) | 64

        );

        $A = self::ge_scalarmult_base($e);

        if (

            !($A->Y instanceof ParagonIE_Sodium_Core32_Curve25519_Fe)

                ||

            !($A->Z instanceof ParagonIE_Sodium_Core32_Curve25519_Fe)

        ) {

            throw new TypeError('Null points encountered');

        }

        $pk = self::edwards_to_montgomery($A->Y, $A->Z);

        return self::fe_tobytes($pk);

    }

}