gistfile1.js

// port of this function:
// https://github.com/openssl/openssl/blob/master/crypto/evp/evp_key.c#L115

var crypto = require('crypto');

var passphrase = new Buffer("secretsecretsecret", "utf8");
var iv = new Buffer("02E2EFAFD7D550A6", "hex");
var addmd = 0;
var md_buf = new Buffer(0);

const KEY_LEN = 24; 
var key = new Buffer(KEY_LEN), kpos = 0;

while (kpos < KEY_LEN) {
    var hash = crypto.createHash('md5');

    if (addmd++) {
        hash.update(md_buf);
    }   

    hash.update(passphrase);
    hash.update(iv);

    md_buf = hash.digest();

    var i = 0;
    while (kpos < KEY_LEN && i < md_buf.length) {
        key[kpos++] = md_buf[i++];
    }   
}

console.log(key);
console.log(key.length);

var cipher = crypto.createDecipheriv("DES-EDE3-CBC", key, iv);