gistfile1.js

// Input:
// perl -MCrypt::CBC -MMIME::Base64 -le 'print MIME::Base64::encode_base64(Crypt::CBC->new(-key=>"test",-cipher=>"DES",-header=>"randomiv")->encrypt("hello world"))';

var crypto = require ('crypto')

var input = 'UmFuZG9tSVZ2l2agomtNj7G5Rff4byYTKJAMbm4+51M=';

var input_buf = new Buffer(input, 'base64');

var KEY_LENGTH = 8;

var key = new Buffer('test', 'ascii');
var iv = new Buffer(8);
var key_md5 = new Buffer(56);

input_buf.copy(iv, 0, 8, 16);

console.log(input_buf);
console.log(iv);
console.log(key.toString());
console.log(input_buf.slice(16));

var md5sum = crypto.createHash('md5');
md5sum.update(key);
var digest = md5sum.digest();
while (digest.length < KEY_LENGTH) {
    md5sum = crypto.createHash('md5');
    md5sum.update(digest);
    digest += md5sum.digest();
}

digest = digest.substr(0, KEY_LENGTH);

console.log(digest.length);

var decipher = crypto.createDecipheriv('des-cbc', digest, iv.toString('binary'));

var output = decipher.update(input_buf.slice(16), 'binary', 'ascii');

console.log(output);

// output: "hello wo" (WTF?)