我正在尝试做一些diffie hellmann，它可以与较小的生成器，mod和私钥一起很好地工作。但是，当数字变大时，它只会输出零。我看了其他帖子没有真正的解决方案。可以在php.ini中进行配置吗？
$gen = 877;
$mod = 80182923;
$saltA = 517;
$saltB = 1517;
echo "calculation of Ga og Gb<br>";
echo "<br>user A shareable value<br>";
$calculatedSecretKeyA = ($gen**$saltA) % $mod;
echo $gen . "^" . $saltA . " mod " . $mod . " = " . $calculatedSecretKeyA;
echo "<br>user B shareable value<br>";
$calculatedSecretKeyB = ($gen**$saltB) % $mod;
echo $gen . "^" . $saltB . " mod " . $mod . " = " . $calculatedSecretKeyB;
echo "<br>user As calc of secret key <br>";
$calcKeyA = ($calculatedSecretKeyB**$saltA) % $mod;
echo $calculatedSecretKeyB . "^" . $saltA . "" . " mod " . $mod . " = " . $calcKeyA;
echo "<br><br>user Bs calc of secret key <br>";
$calcKeyB = ($calculatedSecretKeyA**$saltB) % $mod;
echo $calculatedSecretKeyA . "^" . $saltB . "" . " mod " . $mod . " = " . $calcKeyB;
echo "<br><br>bruteforcer A calc of secret key <br>";
$calcKeyB = ($calculatedSecretKeyA**7) % $mod;
echo $calculatedSecretKeyA . "^" . 7 . "" . " mod " . $mod . " = " . $calcKeyB;
您可以为此使用GMP库（https://www.php.net/manual/en/ref.gmp.php）：
echo "calculation of Ga og Gb<br>";
echo "<br>user A shareable value<br>";
$calculatedSecretKeyA = gmp_mod ( gmp_pow ($gen, $saltA), $mod);
echo $gen . "^" . $saltA . " mod " . $mod . " = " . $calculatedSecretKeyA;
输出：
高Gb
用户A可共享值的计算
877 ^ 517 mod 80182923 = 79127908
本文收集自互联网，转载请注明来源。
如有侵权，请联系[email protected] 删除。
我来说两句