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3
CHANGELOG.md
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# v0.1.0 / 2014-01-05
Initial release

97
README.md
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# js-sha256
This is a simple SHA-256 / SHA-224 hash function for JavaScript supports UTF-8 encoding.
## Install
For node.js, you can use this command to install:
npm install js-sha256
## Usage
If you use node.js, you should require the module first:
```JavaScript
sha256 = require('js-sha256');
```
or
```JavaScript
sha256 = require('js-sha256').sha256;
sha224 = require('js-sha256').sha224;
```
And you could use like this:
```JavaScript
sha256('Message to hash');
sha224('Message to hash');
```
## Example
Code
```JavaScript
sha256('');
sha256('The quick brown fox jumps over the lazy dog');
sha256('The quick brown fox jumps over the lazy dog.');
sha224('');
sha224('The quick brown fox jumps over the lazy dog');
sha224('The quick brown fox jumps over the lazy dog.');
```
Output
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592
ef537f25c895bfa782526529a9b63d97aa631564d5d789c2b765448c8635fb6c
d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f
730e109bd7a8a32b1cb9d9a09aa2325d2430587ddbc0c38bad911525
619cba8e8e05826e9b8c519c0a5c68f4fb653e8a3d8aa04bb2c8cd4c
It also support UTF-8 encoding:
Code
```JavaScript
sha256('中文');
sha224('中文');
```
Output
72726d8818f693066ceb69afa364218b692e62ea92b385782363780f47529c21
dfbab71afdf54388af4d55f8bd3de8c9b15e0eb916bf9125f4a959d4
## Tests
You can open `tests/index.html` in browser or use node.js to run test
node tests/node-test.js
or
npm test
## Extensions
### jQuery
If you prefer jQuery style, you can add following code to add a jQuery extension.
Code
```JavaScript
jQuery.sha256 = sha256
jQuery.sha224 = sha224
```
And then you could use like this:
```JavaScript
$.sha256('message');
$.sha224('message');
```
### Prototype
If you prefer prototype style, you can add following code to add a prototype extension.
Code
```JavaScript
String.prototype.sha256 = function() {
return sha256(this);
};
String.prototype.sha224 = function() {
return sha224(this);
};
```
And then you could use like this:
```JavaScript
'message'.sha256();
'message'.sha224();
```
## Contact
The project's website is located at https://github.com/emn178/js-sha256
Author: emn178@gmail.com

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package.json
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{
"name": "js-sha256",
"version": "0.1.0",
"description": "A simple SHA-256 / SHA-224 hash function for JavaScript supports UTF-8 encoding.",
"main": "src/sha256.js",
"scripts": {
"test": "node tests/node-test.js"
},
"repository": {
"type": "git",
"url": "https://github.com/emn178/js-sha256.git"
},
"keywords": [
"sha",
"sha2",
"sha224",
"sha256",
"hash",
"encryption",
"cryptography",
"HMAC"
],
"author": "emn178 <emn178@gmail.com>",
"homepage": "https://github.com/emn178/js-sha256",
"bugs": {
"url": "https://github.com/emn178/js-sha256/issues"
}
}

184
src/sha256.js
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(function(root, undefined){
'use strict';
var HEX_CHARS = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'];
var HEX_TABLE = {
'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,
'a': 10, 'b': 11, 'c': 12, 'd': 13, 'e': 14, 'f': 15,
'A': 10, 'B': 11, 'C': 12, 'D': 13, 'E': 14, 'F': 15
};
var K =[0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2];
var sha256 = function(message) {
return sha2(message, true);
};
var sha224 = function(message) {
return sha2(message, false);
};
var sha2 = function(message, is256) {
if(is256 === undefined)
is256 = true;
var blocks = hasUTF8(message) ? UTF8toBlocks(message) : ASCIItoBlocks(message);
if(is256)
{
var h0 = 0x6a09e667;
var h1 = 0xbb67ae85;
var h2 = 0x3c6ef372;
var h3 = 0xa54ff53a;
var h4 = 0x510e527f;
var h5 = 0x9b05688c;
var h6 = 0x1f83d9ab;
var h7 = 0x5be0cd19;
}
else // 224
{
var h0 = 0xc1059ed8;
var h1 = 0x367cd507;
var h2 = 0x3070dd17;
var h3 = 0xf70e5939;
var h4 = 0xffc00b31;
var h5 = 0x68581511;
var h6 = 0x64f98fa7;
var h7 = 0xbefa4fa4;
}
for(var i = 0, length = blocks.length;i < length;i += 16)
{
var w = [], s0, s1;
for(var j = 0;j < 16;++j)
w[j] = blocks[i + j];
for(var j = 16;j < 64;++j)
{
s0 = rightrotate(w[j - 15], 7) ^ rightrotate(w[j - 15], 18) ^ (w[j - 15] >>> 3);
s1 = rightrotate(w[j - 2], 17) ^ rightrotate(w[j - 2], 19) ^ (w[j - 2] >>> 10);
w[j] = w[j - 16] + s0 + w[j - 7] + s1;
}
var a = h0;
var b = h1;
var c = h2;
var d = h3;
var e = h4;
var f = h5;
var g = h6;
var h = h7;
var maj, t1, t2, ch;
for(var j = 0;j < 64;++j)
{
s0 = rightrotate(a, 2) ^ rightrotate(a, 13) ^ rightrotate(a, 22);
maj = (a & b) ^ (a & c) ^ (b & c);
t2 = s0 + maj;
s1 = rightrotate(e, 6) ^ rightrotate(e, 11) ^ rightrotate(e, 25);
ch = (e & f) ^ ((~ e) & g);
t1 = (h + s1 + ch + K[j] + w[j]) & 0xffffffff;
h = g;
g = f;
f = e;
e = d + t1;
d = c;
c = b;
b = a;
a = t1 + t2;
}
h0 += a;
h1 += b;
h2 += c;
h3 += d;
h4 += e;
h5 += f;
h6 += g;
h7 += h;
}
var hex = toHexString(h0) + toHexString(h1)+ toHexString(h2) + toHexString(h3) + toHexString(h4) + toHexString(h5) + toHexString(h6);
if(is256)
hex += toHexString(h7);
return hex;
};
var rightrotate = function(x, c) {
return (x >>> c) | (x << (32 - c));
};
var toHexString = function(num) {
var hex = "";
for(var i = 0; i < 4; i++)
{
var offset = 3 - i << 3;
hex += HEX_CHARS[(num >> (offset + 4)) & 0x0F] + HEX_CHARS[(num >> offset) & 0x0F];
}
return hex;
};
var hasUTF8 = function(message) {
var i = message.length;
while(i--)
if(message.charCodeAt(i) > 255)
return true;
return false;
};
var ASCIItoBlocks = function(message) {
// a block is 32 bits(4 bytes), a chunk is 512 bits(64 bytes)
var length = message.length;
var chunkCount = ((length + 8) >> 6) + 1;
var blockCount = chunkCount << 4; // chunkCount * 16
var blocks = [];
var i;
for(i = 0;i < blockCount;++i)
blocks[i] = 0;
for(i = 0;i < length;++i)
blocks[i >> 2] |= message.charCodeAt(i) << (3 - (i % 4) << 3);
blocks[i >> 2] |= 0x80 << (3 - (i % 4) << 3);
blocks[blockCount - 1] = length << 3; // length * 8
return blocks;
};
var UTF8toBlocks = function(message) {
var uri = encodeURIComponent(message);
var blocks = [];
for(var i = 0, bytes = 0, length = uri.length;i < length;++i)
{
var c = uri.charCodeAt(i);
if(c == 37) // %
blocks[bytes >> 2] |= ((HEX_TABLE[uri.charAt(++i)] << 4) | HEX_TABLE[uri.charAt(++i)]) << (3 - (bytes % 4) << 3);
else
blocks[bytes >> 2] |= c << (3 - (bytes % 4) << 3);
++bytes;
}
var chunkCount = ((bytes + 8) >> 6) + 1;
var blockCount = chunkCount << 4; // chunkCount * 16
var index = bytes >> 2;
blocks[index] |= 0x80 << (3 - (bytes % 4) << 3);
for(var i = index + 1;i < blockCount;++i)
blocks[i] = 0;
blocks[blockCount - 1] = bytes << 3; // bytes * 8
return blocks;
};
if(typeof(module) != 'undefined')
{
sha256.sha256 = sha256;
sha256.sha224 = sha224;
module.exports = sha256;
}
else if(root)
{
root.sha256 = sha256;
root.sha224 = sha224;
}
}(this));

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tests/debug.js
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(function(root) {
var assert = function (title, expect, actual) {
if(expect == actual)
console.log(title + ': true');
else
console.log(title + ': false', 'Except:' + expect, 'Actual: ' + actual);
};
if(typeof(module) != 'undefined')
global.assert = assert;
else if(root)
root.assert = assert;
})(this);

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tests/index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>SHA256</title>
<script src="../src/sha256.js"></script>
<script src="debug.js"></script>
<script src="test.js"></script>
</head>
<body>
</body>
</html>

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tests/node-test.js
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// this also works:
// sha256 = require('../src/sha256.js');
sha256 = require('../src/sha256.js').sha256;
sha224 = require('../src/sha256.js').sha224;
require('./debug.js');
require('./test.js');

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tests/test.js
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assert('sha256 1', 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855', sha256(''));
assert('sha256 2', 'd7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592', sha256('The quick brown fox jumps over the lazy dog'));
assert('sha256 3', 'ef537f25c895bfa782526529a9b63d97aa631564d5d789c2b765448c8635fb6c', sha256('The quick brown fox jumps over the lazy dog.'));
assert('sha224 1', 'd14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f', sha224(''));
assert('sha224 2', '730e109bd7a8a32b1cb9d9a09aa2325d2430587ddbc0c38bad911525', sha224('The quick brown fox jumps over the lazy dog'));
assert('sha224 3', '619cba8e8e05826e9b8c519c0a5c68f4fb653e8a3d8aa04bb2c8cd4c', sha224('The quick brown fox jumps over the lazy dog.'));
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