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функция не описана

ParagonIE_Sodium_Core_Curve25519::ge_scalarmult() public WP 1.0

{} Это метод класса: ParagonIE_Sodium_Core_Curve25519{}

Хуков нет.

Возвращает

ParagonIE_Sodium_Core_Curve25519_Ge_P3.

Использование

$result = ParagonIE_Sodium_Core_Curve25519::ge_scalarmult( $a, $p );
$a(строка) (обязательный)
-
$p(ParagonIE_Sodium_Core_Curve25519_Ge_P3) (обязательный)
-

Код ParagonIE_Sodium_Core_Curve25519::ge_scalarmult() WP 5.8

<?php
public static function ge_scalarmult($a, $p)
{
    $e = array_fill(0, 64, 0);

    /** @var ParagonIE_Sodium_Core_Curve25519_Ge_Cached[] $pi */
    $pi = array();

    //        ge25519_p3_to_cached(&pi[1 - 1], p);   /* p */
    $pi[0] = self::ge_p3_to_cached($p);

    //        ge25519_p3_dbl(&t2, p);
    //        ge25519_p1p1_to_p3(&p2, &t2);
    //        ge25519_p3_to_cached(&pi[2 - 1], &p2); /* 2p = 2*p */
    $t2 = self::ge_p3_dbl($p);
    $p2 = self::ge_p1p1_to_p3($t2);
    $pi[1] = self::ge_p3_to_cached($p2);

    //        ge25519_add_cached(&t3, p, &pi[2 - 1]);
    //        ge25519_p1p1_to_p3(&p3, &t3);
    //        ge25519_p3_to_cached(&pi[3 - 1], &p3); /* 3p = 2p+p */
    $t3 = self::ge_add($p, $pi[1]);
    $p3 = self::ge_p1p1_to_p3($t3);
    $pi[2] = self::ge_p3_to_cached($p3);

    //        ge25519_p3_dbl(&t4, &p2);
    //        ge25519_p1p1_to_p3(&p4, &t4);
    //        ge25519_p3_to_cached(&pi[4 - 1], &p4); /* 4p = 2*2p */
    $t4 = self::ge_p3_dbl($p2);
    $p4 = self::ge_p1p1_to_p3($t4);
    $pi[3] = self::ge_p3_to_cached($p4);

    //        ge25519_add_cached(&t5, p, &pi[4 - 1]);
    //        ge25519_p1p1_to_p3(&p5, &t5);
    //        ge25519_p3_to_cached(&pi[5 - 1], &p5); /* 5p = 4p+p */
    $t5 = self::ge_add($p, $pi[3]);
    $p5 = self::ge_p1p1_to_p3($t5);
    $pi[4] = self::ge_p3_to_cached($p5);

    //        ge25519_p3_dbl(&t6, &p3);
    //        ge25519_p1p1_to_p3(&p6, &t6);
    //        ge25519_p3_to_cached(&pi[6 - 1], &p6); /* 6p = 2*3p */
    $t6 = self::ge_p3_dbl($p3);
    $p6 = self::ge_p1p1_to_p3($t6);
    $pi[5] = self::ge_p3_to_cached($p6);

    //        ge25519_add_cached(&t7, p, &pi[6 - 1]);
    //        ge25519_p1p1_to_p3(&p7, &t7);
    //        ge25519_p3_to_cached(&pi[7 - 1], &p7); /* 7p = 6p+p */
    $t7 = self::ge_add($p, $pi[5]);
    $p7 = self::ge_p1p1_to_p3($t7);
    $pi[6] = self::ge_p3_to_cached($p7);

    //        ge25519_p3_dbl(&t8, &p4);
    //        ge25519_p1p1_to_p3(&p8, &t8);
    //        ge25519_p3_to_cached(&pi[8 - 1], &p8); /* 8p = 2*4p */
    $t8 = self::ge_p3_dbl($p4);
    $p8 = self::ge_p1p1_to_p3($t8);
    $pi[7] = self::ge_p3_to_cached($p8);


    //        for (i = 0; i < 32; ++i) {
    //            e[2 * i + 0] = (a[i] >> 0) & 15;
    //            e[2 * i + 1] = (a[i] >> 4) & 15;
    //        }
    for ($i = 0; $i < 32; ++$i) {
        $e[($i << 1)    ] =  self::chrToInt($a[$i]) & 15;
        $e[($i << 1) + 1] = (self::chrToInt($a[$i]) >> 4) & 15;
    }
    //        /* each e[i] is between 0 and 15 */
    //        /* e[63] is between 0 and 7 */

    //        carry = 0;
    //        for (i = 0; i < 63; ++i) {
    //            e[i] += carry;
    //            carry = e[i] + 8;
    //            carry >>= 4;
    //            e[i] -= carry * ((signed char) 1 << 4);
    //        }
    $carry = 0;
    for ($i = 0; $i < 64; ++$i) {
        $e[$i] += $carry;
        $carry = $e[$i] + 8;
        $carry >>= 4;
        $e[$i] -= $carry << 4;
    }
    //        e[63] += carry;
    //        /* each e[i] is between -8 and 8 */
    $e[63] += $carry;

    //        ge25519_p3_0(h);
    $h = self::ge_p3_0();

    //        for (i = 63; i != 0; i--) {
    for ($i = 63; $i != 0; --$i) {
        // ge25519_cmov8_cached(&t, pi, e[i]);
        $t = self::ge_cmov8_cached($pi, $e[$i]);
        // ge25519_add_cached(&r, h, &t);
        $r = self::ge_add($h, $t);

        // ge25519_p1p1_to_p2(&s, &r);
        // ge25519_p2_dbl(&r, &s);
        // ge25519_p1p1_to_p2(&s, &r);
        // ge25519_p2_dbl(&r, &s);
        // ge25519_p1p1_to_p2(&s, &r);
        // ge25519_p2_dbl(&r, &s);
        // ge25519_p1p1_to_p2(&s, &r);
        // ge25519_p2_dbl(&r, &s);
        $s = self::ge_p1p1_to_p2($r);
        $r = self::ge_p2_dbl($s);
        $s = self::ge_p1p1_to_p2($r);
        $r = self::ge_p2_dbl($s);
        $s = self::ge_p1p1_to_p2($r);
        $r = self::ge_p2_dbl($s);
        $s = self::ge_p1p1_to_p2($r);
        $r = self::ge_p2_dbl($s);

        // ge25519_p1p1_to_p3(h, &r);  /* *16 */
        $h = self::ge_p1p1_to_p3($r); /* *16 */
    }

    //        ge25519_cmov8_cached(&t, pi, e[i]);
    //        ge25519_add_cached(&r, h, &t);
    //        ge25519_p1p1_to_p3(h, &r);
    $t = self::ge_cmov8_cached($pi, $e[0]);
    $r = self::ge_add($h, $t);
    return self::ge_p1p1_to_p3($r);
}