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 (WARNING: since Firefox does not support the
Dataview
API, you should use the David Flanagan's emulation) - Safari 5.1
- 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
-
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");
-
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();
-
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);
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)
digest.js is released under the terms of the GNU GENERAL PUBLIC LICENSE Version 3