can be used for RSA encryption/decryption!
gmp_powm
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_powm — Raise number into power with modulo
Опис
Calculate (base raised into power
exp) modulo mod. If
exp is negative, result is undefined.
Параметри
-
base -
The base number.
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
-
exp -
The positive power to raise the
base.Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
-
mod -
The modulo.
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
Значення, що повертаються
The new (raised) number, as a GMP number.
Приклади
Приклад #1 gmp_powm() example
<?php
$pow1 = gmp_powm("2", "31", "2147483649");
echo gmp_strval($pow1) . "\n";
?>
Наведений вище приклад виведе:
2147483648
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