https://github.com/opencoff/crypto-rand

AES and Chacha based cryptographic random generator
https://github.com/opencoff/crypto-rand

aes256-random arc4random chacha-cipher cryptographic-random-generator nist-sp-800-22

Last synced: 2 months ago
JSON representation

AES and Chacha based cryptographic random generator

• Host: GitHub
• URL: https://github.com/opencoff/crypto-rand
• Owner: opencoff
• Created: 2021-08-13T22:27:16.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2021-08-13T22:27:40.000Z (almost 4 years ago)
• Last Synced: 2025-02-07T06:15:17.821Z (4 months ago)
• Topics: aes256-random, arc4random, chacha-cipher, cryptographic-random-generator, nist-sp-800-22
• Language: C
• Homepage:
• Size: 16.6 KB
• Stars: 3
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
# crypto-rand

This is a thread-safe adaptation of OpenBSD arc4random(2)

cryptographic random generator but generalized to use

AES-256-CTR or Chacha20 ciphers.

Both cryptographic random generators pass NIST-SP800-22 (Rev 1a).

## Using the API

The core of the code is in `cryptorand.c` and the API is documented

in `cryptorand.h`.

## Testing and Performance

The NIST-SP800-22 test suite is [here](https://github.com/dj-on-github/sp800_22_tests.git).

To run the NIST-SP800-2 tests, first fetch the test-suite from

github:

    git clone https://github.com/dj-on-github/sp800_22_tests.git

    make

    ./t_arc4rand 1048576 > arc4

    ./t_aesrand 1048576 > aes

    cd sp800_22_tests

    ./sp800_22_tests.py ../arc4

    ./sp800_22_tests.py ../aes

There are also a couple of benchmarks to measure speed of the

generators against the system's random generator (/dev/urandom):

        ./t_arc4rand_bench 16 32 64 128

        ./t_aesrand_bench  16 32 64 128

The benchmarks show the speed-up of the generators relative to the

system's random generator.

The core random generator should be quite portable to any system

(including RTOS). It only uses C stdlib and no stdio. The repository

includes portable implementations of AES and Chacha20. The cipher

specific code is separated into `cipher.h`. If your platform

provides HW accelerated AES, it is quite easy to plug that into this

generator.

## How is it licensed?

I don't have any special licensing terms; my changes are subject to

the original licensing terms in the file `cryptorand.c`.