geraintluff / sha256

SHA-256 in JavaScript, in less than a kilobyte

A small SHA-256 implementation for JavaScript

The goals of this project are:

• small size - the minified version is only 849 bytes
• readability - the unminified code should be relatively easy to understand/review

Input must be an ASCII string - if character codes outside the range 0-255 are received, undefined is returned.

In the browser

The code (sha256.js or sha256.min.js) defines the sha256(string) function, which returns the hexadecimal-encoded SHA-256 hash of the input string.

AMD is also supported - use index.js instead.

In Node/CommonJS

If you're on Node, you should probably use the version from the built-in crypto module.

However, it is made available as a CommonJS module, including the source code for the minified version:

var sha256 = require('tiny-sha256');

var jsCode = sha256.code + 'alert(sha256("hello!"));';

License

This library is released as "public domain". You can copy, modify, re-release and re-license, or incorporate into any other project without restriction of any kind.

sha256's Issues

Why is i+j here?

sha256/sha256.js

Line 57 in 2e75ec9

var i2 = i + j;

I don't see it being used anywhere

Issue with sha256('abc£123')

The currency pound sign £ is character code 163 (<255), but this library returns the wrong value:

sha256('abc£123');

actual: 25c772bc82b146ed5c1552ec42fc67a1a6140042c3cf1e95721ff0a8b38864f3
expected either:
57c797465642f80fd87c5caa0838c79db1d14b52c6f79819f811aa7550aa4c4d
or
undefined