can be used for RSA encryption/decryption!
(PHP 4 >= 4.0.4, PHP 5)
gmp_powm — Raise number into power with modulo
Calculate (base
raised into power
exp
) modulo mod
. If
exp
is negative, result is undefined.
base
The base number.
可以是一個 GMP 數據 resouce,或一個可以轉換為數值的字串。
exp
The positive power to raise the base
.
可以是一個 GMP 數據 resouce,或一個可以轉換為數值的字串。
mod
The modulo.
可以是一個 GMP 數據 resouce,或一個可以轉換為數值的字串。
The new (raised) number, as a GMP number.
Example #1 gmp_powm() example
<?php
$pow1 = gmp_powm("2", "31", "2147483649");
echo gmp_strval($pow1) . "\n";
?>
上例將輸出:
2147483648