This a Javascript implementation of Bruce Schneier's Blowfish encryption algorithm.

Feedback of any sort is welcome to blowfish@nklein.com

There are a few Javascript files available here:

blowfish.js

This file implements the Blowfish algorithm. The _encrypt_block() and _decrypt_block() methods take an array of two 32-bit numbers and replace those numbers with the encrypted/decrypted values. The encrypt_block() method takes an array of eight 8-bit integers which are assembled into the two 32-bit numbers to be fed to the _encrypt_block() method and places the result back into the input array.

var password = [ 0x33, 0x55, 0x77, 0x12, 0x33 ]; var bf = new Blowfish(); bf.init( password ); var vals = [ 0x01234567, 0xFEDCBA98 ]; bf._encrypt_block( vals ); bf._decrypt_block( vals ); var vec = [ 0x20, 0x6E, 0x6B, 0x6C, 0x65, 0x69, 0x6E, 0x20 ]; bf.encrypt_block( vec );

blowfish-test.js

This file has one function StandardBlowfishTests() which runs the Blowfish implementation against the 58 standard test vectors. Note: on slower machines, this can take quite some time. If your browser asks you to continue or stop the script, you should continue.

cfb-stream.js

This file implements a class CFBStream which takes any block cipher that supports an encode_block() method and a BLOCKSIZE property like the Blowfish algorithm above does and turns it into a Cipher Feedback Stream.

var password = [ 0x33, 0x55, 0x77, 0x12, 0x33 ]; var bf = new Blowfish(); bf.init( password ); var password = [ 0x33, 0x55, 0x77, 0x12, 0x33 ]; var iv = [ 0x11, 0x22, 0xA1, 0xB2, 0xC7, 0x99, 0x6E, 0x20 ]; var ecb = new CFBStream( bf, iv ); var plaintext = "The magic words are squeamish ossifrage."; var ciphertext = ecb.encrypt( plaintext ); var dcb = new CFBStream( bf, iv ); var decoded = dcb.decrypt( plaintext );

Note: the CFBStream is stateful. So, to decrypt, you need to start it with the same initial vector iv that you started the encrypting with.