github.com/seehuhn/sha256d

SHA-256d

An implementation of the SHA-256d hash for the Go programming language.

Copyright (C) 2013 Jochen Voss

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

The homepage of this package is at http://www.seehuhn.de/pages/sha256d . Please send any comments or bug reports to the program's author, Jochen Voss [e-mail] .

Overview

This package provides an implementation of the SHA-256d hash algorithm (also known as "double SHA-256") for the Go programming language. SHA-256d is a cryptographic hash, first proposed by Ferguson and Schneier in the book "Practical Cryptography". The SHA-256d hash is used in the Bitcoin protocol and in the Fortuna random number generator.

The SHA-256d hash is obtained by applying the SHA-256 hash twice, i.e. by first applying SHA-256 to the data and then again to the resulting hash.

Installation

::

go get github.com/seehuhn/sha256d

Usage

The sha256d package implements the standard hash.Hash interface. Example::

hash := sha256d.New()
n, _ := hash.Write([]byte("hello"))
hashVal := hash.Sum(nil)