digest-js
v0.3.0
Published
A simple javascript library implementing cryptographic digests, HMAC and PBKDF algorithms.
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digest.js
Overview
digest.js is a javascript library implementing cryptographic digest and HMAC algorithms.
digest.js is designed for modern web browsers and requires the W3C Typed Arrays support. digest.js has been successfully tested with these web browsers:
- Chrome 11
- Firefox 4
- Safari 5.1
- IE 10
Supported algorithms:
- digest
- MD5
- SHA-1
- SHA-256
- Message Authentication Code (MAC)
- HMAC/MD5
- HMAC/SHA-1
- HMAC/SHA-256
- Password-Based Key Derivation Function (PBKDF)
- PBKDF1/SHA1
- PBKDF1/MD5
- PBKDF2/HMAC/SHA1
- PBKDF2/HMAC/SHA-256
Installation
Node
npm install digest-js
and then
Digest = require('digest-js');
Browser
<script type="text/javascript" src="path/to/digest.min.js"></script>
Compilation
digest.js is using npm and grunt
Install Grunt
npm install -g grunt-cli
Download dependencies
npm install
Build the library
grunt
API Usage
Digest
Initialize a digest object
var dg = new Digest.SHA1();
Update some data
var data = new ArrayBuffer(3); var buf = new Uint8Array(data); buf[0] = 0x61; /* a */ buf[1] = 0x62; /* b */ buf[2] = 0x63; /* c */ dg.update(data);
Finalize
var result = dg.finalize();
It is also possible to digest some data at once:
var dg = new Digest.SHA1();
var result = dg.digest("abc");
MAC
Initialize a MAC object
var mac = new Digest.HMAC_SHA1();
Set the key
mac.setKey("KeyInPlainText");
Update some data
var data = new ArrayBuffer(50); var buf = new Uint8Array(data); for (var i = 0; i < 50; i++) { buf[i] = 0xdd; } mac.update(data);
Finalize
var result = mac.finalize();
PBKDF
Initialize a PBKDF object with the iteration count
var pbkdf = new Digest.PBKDF_HMAC_SHA1(2048);
Derive key with the password, salt and desired key length (in bytes)
var key = pbkdf.deriveKey("password", "salt", 24);
Misc
After the finalize
, digest
or mac
methods have been called, the digest or mac object is automatically reset and can be reused.
The update
, digest
and mac
methods accept these data types:
ArrayBuffer
String
(US-ASCII encoding)byte
(i.e. a number in the range 0-255)
The MAC setKey
method accepts these data types:
ArrayBuffer
String
(US-ASCII encoding)
The PBKDF deriveKey
method accepts these data types for password and salt:
ArrayBuffer
String
(US-ASCII encoding)
License
digest.js is released under the terms of the GNU GENERAL PUBLIC LICENSE Version 3