richardds/big-integer

Library for big integer manipulation

0.1.0 2021-01-13 15:43 UTC

Requires

• php: ^7.2 || ^8.0
• ext-gmp: *

MIT

• Richard Boldiš

• math
• BigInteger
• bigdecimal
• bignumber

README

PHP OOP library for fast big integer manipulation made as a wrapper around GMP library. The library is not converting the numbers into a string but uses GMP resources, which comes with significant speed improvement compared to other libraries. The library has no external dependencies.

General requirements

• php-7.2 and higher
• php-gmp library

How to install GMP on Apline Linux

RUN apk add --update --no-cache gmp
RUN apk add --update --no-cache --virtual .phpize-deps $PHPIZE_DEPS autoconf g++ make gmp-dev && \
    docker-php-ext-install gmp && \
    apk del .phpize-deps $PHPIZE_DEPS autoconf g++ make gmp-dev

Examples

Majority of the methods accept BigInteger object, string or int. The BigInteger object uses GMP resource. Therefore, there is no slow string conversion on every operation.

use Richardds\BigInteger\BigInteger;
use Richardds\BigInteger\Utils as BigIntegerUtils;

$g = BigInteger::fromInt(2);
$e = BigInteger::fromString("<big_integer>");
$m = BigInteger::fromString("<big_integer>");
$c = $g->powMod($e, $m);

$p = BigInteger::fromBuffer("<buffer>");
$z = BigInteger::fromString("<big_integer>");

$x = $g->powMod($p, $m)
       ->mul($z->sub(BigInteger::one()))
       ->mod($m);

$a = BigInteger::fromString("<big_integer>");
$b = BigInteger::fromString("<big_integer>");
$gcd = $a->gcd($b);
$gcd = BigIntegerUtils::gcd($a, $b);