gmp_pow（）将不接受指数的GMP编号 [英] gmp_pow() will not accept a GMP number for exponent

问题描述

我在PHP中玩RSA和大数字。我需要能够使用gmp_pow（）数字到具有〜256到〜512字节的指数的幂。

I am playing around in PHP with RSA and big numbers. I need to be able to take numbers to the power of an exponent that has ~256 to ~512 bytes using gmp_pow(). Does anyone have any suggestions?

推荐答案

您应该使用gmp_powm（），它会自动将中间值减小到小于模值。这正是你想要的RSA。

You should use gmp_powm() which automatically reduces the intermediate values to be less than the modulus value. This exactly what you want for RSA.

gmp_pow（）不接受大于一个长的指数，因为中间值将大于计算机中的可寻址内存。

gmp_pow() doesn't accept an exponent large than a long since the intermediate values will be larger than the addressable memory in your computer.

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