SHA1 Implementation in Go

This is an implementation of SHA-1 in Go. It follows the FIPS 180-1 standard.

Features

• Interactive REPL for experimentation (see As a REPL)

Limitations

• This implementation is strictly for educational purposes. SHA-1 is considered cryptographically broken and should not be used in production.

Usage

As a Library

package main

import (
	"fmt"
	"github.com/YA2IR/sha1"
)

func main() {
	s := sha1.NewSHA1()

	message1 := "hello world"
	message2 := "hello"

	digest := s.Hash([]byte(message1))
	fmt.Printf("SHA1 of \"%s\" = %x\n", message1, digest)

	digest = s.Hash([]byte(message2))
	fmt.Printf("SHA1 of \"%s\" = %x\n", message2, digest)

}

output:

SHA1 of "hello world" = 2aae6c35c94fcfb415dbe95f408b9ce91ee846ed
SHA1 of "hello" = aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d

As a REPL

Clone this repo:

git clone https://github.com/YA2IR/sha1.git
cd sha1

Then you can run:

go run cmd/sha1/main.go

Welcome to SHA1 REPL, write 'exit' to exit
> test
SHA1: a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
> test2
SHA1: 109f4b3c50d7b0df729d299bc6f8e9ef9066971f
> exit