Advice needed for bigint with GCC

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I all,
After years, I start to play with C again, and I need a bigint library.
What library would you advice, preferably free with source code.

What I have tried:

Actually searching internet.
Just found that there is a GMP, but no idea how it is.
[Update]
Want to play/butchering with numbers like RSA2048.

Posted 19-Nov-20 9:50am

Patrice T

Updated 28-Nov-20 1:48am

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CPallini 19-Nov-20 16:04pm

GMP looks a good choice, but I never dealt with bigint libraries, sorry.

Patrice T 19-Nov-20 16:46pm

No problem.

k5054 19-Nov-20 17:49pm

Maybe try ttmath.org / Bignum C++ library[^]

Patrice T 19-Nov-20 17:58pm

Got some experience with it ?

k5054 19-Nov-20 18:02pm

No, but it looks a lot simpler than mucking about with gmp. But there's a boost multi-precision class that might be a better option. One of the types wraps gmp bigints so you get a cleaner interface and trusted goodness of gmp and boost.

Rick York 19-Nov-20 18:52pm

How big do they need to be? This one supports 96-bit integers : https://www.codeproject.com/Articles/371/CInt96-v1-04-96-Bit-Integers. Except it uses MFC but probably just for CString and that can replaced easily enough.

Patrice T 19-Nov-20 19:38pm

:) Want to play with RSA2048.

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RAMASWAMY EKAMBARAM · Accepted Answer · 2020-11-27T19:47:00

Solution 1

see if this helps:
math lib written in C

Posted 27-Nov-20 19:47pm

RAMASWAMY EKAMBARAM

**`Randor`** · Accepted Answer · 2020-11-28T01:48:00

Solution 2

Hi,

I would recommend that you take a look at MPIR[^].

Best Wishes,
-David Delaune

Posted 28-Nov-20 1:48am

Randor