bignum | big number computation | Math library

by mrdcvlsc C++ Version: v2.8.8 License: MIT

X-Ray Key Features Code Snippets(3)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | bignum Summary

bignum is a C++ library typically used in Utilities, Math applications. bignum has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

bignum - c++ for big number computation (arbitrary-precision arithmetic)

Support

Quality

Security

License

Reuse

Support

bignum has a low active ecosystem.

It has 8 star(s) with 2 fork(s). There are 2 watchers for this library.

It had no major release in the last 12 months.

There are 0 open issues and 1 have been closed. On average issues are closed in 33 days. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of bignum is v2.8.8

Quality

bignum has no bugs reported.

Security

bignum has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

bignum is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

bignum releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

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bignum Key Features

No Key Features are available at this moment for bignum.

bignum Examples and Code Snippets

Arithmetic Operators

C++

Lines of Code : 31

License : Permissive (MIT)

Copy

bnum a = "966649767633554246465753766946573.67644334";;
bnum b = 365365211765899436ll;
bnum i = 0, j = 100;

bnum add, sub, mul, div, mod;

// overloaded arithmetic operators
add = a + b;
sub = a - b;
mul = a * b;
div = a / b;
mod = a % b;

/* you ca

sample code,FACTORIAL SAMPLE CODE

C++

Lines of Code : 26

License : Permissive (MIT)

Copy

// main.cpp

#include 
#include "bint.hpp"

using namespace std;

int main(){

  // A very slow factorial

  cout<<"FACTORIAL OF A NUMBER : "<

'bint' has a faster performance than 'bnum' but only computes big integers

C++

Lines of Code : 23

License : Permissive (MIT)

Copy

Architecture:                    x86_64
CPU op-mode(s):                  32-bit, 64-bit
Byte Order:                      Little Endian
Address sizes:                   36 bits physical, 48 bits virtual
CPU(s):                          4
On-line CPU(s

Community Discussions

Trending Discussions on bignum

Undefined symbols for architecture arm64: _BN_new

Generic math in Rust without Copy (std::ops::Add, etc.)

ujson Package Installation Error in Python

Partition function P in Picat

Size of numeric data types in Ruby

OpenSSL RSA_sign C++ - Different sign than the command line

What causes the difference between memcpy and strcpy in copying openssl BIGNUM

RSA signature generated with mbedtls, can't verify with C# (bouncycastle) application

JNI DETECTED ERROR IN APPLICATION: use of invalid jobject when returning Array of String

Kotlin Native compile jar and framework

QUESTION

Undefined symbols for architecture arm64: _BN_new

Asked 2021-Jun-05 at 18:44

I'm trying to compile this super simple code:

...

ANSWER

Answered 2021-Jun-05 at 18:44

As you found, this function is defined in the libcrypto library, but you did not actually link with that library. You need to add -lcrypto to the end of your linker command line.

The -L option specifies a directory to be searched for libraries requested with -l options, but does not itself add any libraries to the link.

Source https://stackoverflow.com/questions/67852583

QUESTION

Generic math in Rust without Copy (std::ops::Add, etc.)

Asked 2021-May-22 at 18:29

As part of a "learn Rust" project, I've been working through some Project Euler problems, in which it would be convenient to have a few generic math functions. As an example, let's say I want to write a generic "square" function. If I can live with the builtin numeric types (all of which I believe are Copy), I can write this:

...

ANSWER

Answered 2021-May-22 at 18:29

You need to bound &'a A to be Mul, not A:

Source https://stackoverflow.com/questions/67652681

QUESTION

ujson Package Installation Error in Python

Asked 2021-Apr-22 at 01:16

When I try to install ujson package in python 3.6 on Windows 10, (which is needed for binance-python library installation) I got this error:

...

ANSWER

Answered 2021-Apr-22 at 01:16

Try to install Visual Studio, here: https://visualstudio.microsoft.com/. Often, packages depend on Visual Studio for C/C++ compilers.

It appears it terminates because running the below command:

Source https://stackoverflow.com/questions/65925396

QUESTION

Partition function P in Picat

Asked 2021-Apr-14 at 00:57

I got the following realization of the Partition function P
in Prolog, took it from rosetta here:

...

ANSWER

Answered 2021-Apr-13 at 21:00

Bignums is no problem in Picat. Here's my Picat version (inspired by the Maple approach):

Source https://stackoverflow.com/questions/67047336

QUESTION

Size of numeric data types in Ruby

Asked 2021-Mar-21 at 12:20

I know that Ruby has Float for real, Fixnum and Bignum for int. But what about sizes of this types?

a = 1.23 // size of one Float in bytes?

b = 1 // size of one Fixnum in bytes?

c = 2**65 // = size of one Bignum in bytes?

I am trying to find a standard or specification

...

ANSWER

Answered 2021-Mar-21 at 12:16

Fixnum has the size method

Source https://stackoverflow.com/questions/66729524

QUESTION

OpenSSL RSA_sign C++ - Different sign than the command line

Asked 2021-Feb-23 at 16:05

I am trying to develop a Digital Signature tool using OpenSSL's libs but the created sign from my code is different than the one I get from the command line.

I checked and validated that the SHA256 digest is correct.

This is an example of the command I use to validate the signatures:

...

ANSWER

Answered 2021-Feb-23 at 16:05

I have implemented the RSA_verify function and based on the sign my code does, RSA_verify works and it returns that it is valid. I have also added the code to save the public key as well.

My best guess is that my code doesn't represent exactly the command.

Source https://stackoverflow.com/questions/66329014

QUESTION

What causes the difference between memcpy and strcpy in copying openssl BIGNUM

Asked 2021-Feb-21 at 03:40

This problem bothered me for an hour when I was programming, but I still didn't know the error of the original method after solving it.

...

ANSWER

Answered 2021-Feb-20 at 09:33

What causes the difference between memcpy and strcpy in copying openssl BIGNUM

The comment "BIGNUM values are not C strings, so strcpy() won't work." may be not enough to enlighten you.
BIGNUM values can contain a byte with all bits set to 0, called the null character, and since that is used to terminate a character string, strcpy() stops there and doesn't copy the rest of the BIGNUM value.

Source https://stackoverflow.com/questions/66289710

QUESTION

RSA signature generated with mbedtls, can't verify with C# (bouncycastle) application

Asked 2021-Feb-16 at 23:12

I'm signing a 32 byte challenge with RSA, using mbedtls.

The relevant lines of C code look like this; I'm creating a signature in 'signature' for the 32 byte 'challenge' array, using a private key:

...

ANSWER

Answered 2021-Feb-16 at 23:12

The C/C++ code expects the hash of the message when verifying and therefore does not hash before verifying. The C# code, on the other hand, expects the message itself when verifying and performs the hashing before verifying itself.

Therefore, if the hash of the message is passed to the C# code instead of the message, a double hashed message is verified with the signature for a single hashed message, which fails.

The problem can be solved if no hashing is performed in the C# code analog to the C/C++ code before verification. For this, e.g. under .NET Core the verification can be performed with RSACng#VerifyHash(), which in contrast to RSACng#VerifyData() expects the hash of the message analogous to the C/C++ code.

A possible implementation is:

Source https://stackoverflow.com/questions/66151052

QUESTION

JNI DETECTED ERROR IN APPLICATION: use of invalid jobject when returning Array of String

Asked 2020-Dec-30 at 12:10

Description of the intended goal

I'm trying to implement OpenSSL-generated public/private key pairs in Android/Kotlin using JNI, in order to implement user encryption on the information stored to the cloud server. I've compiled all OpenSSL source code and generated all .so files correcly.

The code (C++)

The C++ code to use OpenSSL is shown below. CmakeLists.txt and NDK configuration is working fine.

...

ANSWER

Answered 2020-Dec-30 at 12:10

You never created a java string out of public_key_text

Try

Source https://stackoverflow.com/questions/65506461

QUESTION

Kotlin Native compile jar and framework

Asked 2020-Dec-05 at 14:24

I'm building a multiplatform library for Android and iOS. My gradle file looks like this:

...

ANSWER

Answered 2020-Dec-05 at 14:24

JVM

So, the only way I've found to generate a Fat JAR that works like you expect is by adding two custom gradle tasks in project:build.gradle.kts of your KMP library after appling the java plugin.

Source https://stackoverflow.com/questions/65039841

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install bignum

You can download it from GitHub.

Support

[ ] Remove conversion of string to long long int and vice-versa on arithmetic operations to increase performance. [ ] POWER FUNCTION. [ ] FACTORIAL FUNCTION (I NEED A FAST ONE - prime swing or multithreading). [ ] cNr FUNCTION. [ ] pNr FUNTION. [ ] bitwise operators. [ ] cube root / square root / root (fast one).

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