ParagonIE_Sodium_Core32_X25519::crypto_scalarmult_curve25519_ref10_base() public WP 1.0

{} It's a method of the class: ParagonIE_Sodium_Core32_X25519{}

No Hooks.

Return

String.

Usage

$result = ParagonIE_Sodium_Core32_X25519::crypto_scalarmult_curve25519_ref10_base( $n );

$n(string) (required)

-

Code of ParagonIE_Sodium_Core32_X25519::crypto_scalarmult_curve25519_ref10_base() ParagonIE Sodium Core32 X25519::crypto scalarmult curve25519 ref10 base ^{WP 5.8.2}

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);
}