Encrypting and decrypting aes128 ciphers with an initialization vector in node.js.

cipher-func.js

var crypto = require('crypto');
var secret = crypto.randomBytes(24);

function encrypt(plaintext) {
    var cipher = crypto.createCipher('aes-256-cbc', secret);
    cipher.setAutoPadding(false);
    var ciphertext = '';
    for (var i=0; i < plaintext.length; i+=16) {
        ciphertext += cipher.update(plaintext.substr(i, i+16), 'utf8', 'base64');
    }
    return ciphertext.toString('base64');
}

function decrypt(ciphertext) {
    var decipher = crypto.createDecipher('aes-256-cbc', secret);
    decipher.setAutoPadding(false);
    var plaintext = decipher.update(ciphertext, 'base64', 'utf8');
    return plaintext.toString('utf8');
}

var ciphertext = encrypt(new Buffer("The secret crow ate the pie of the bear.").toString('utf8'));

console.log("Cipher text is: " + ciphertext);
console.log("Plain text is: " + decrypt(ciphertext));

cipher.js

var crypto = require('crypto');

var secret = crypto.randomBytes(16),
    cipher = crypto.createCipheriv("aes128", secret, secret),
    decipher = crypto.createDecipheriv("aes128", secret,secret);

cipher.setAutoPadding(false);
decipher.setAutoPadding(false);

var plaintext = "This is my super secret password";
var ciphertext = cipher.update(plaintext);

console.log("Cipher text is:");
console.log(ciphertext.toString());

var deciphertext = decipher.update(ciphertext);

console.log("");
console.log("Deciphered text is:");
console.log(deciphertext.toString());

In cipher-func.js you are using substr() incorrectly. Where you have substr(i, i+16), it should by substr(i, 16). The second param is the length of the substring, not the ending position.

I wonder, would this be usable for generating an Ethereum wallet address / account?

wonderful ,, but why the setAutoPadding() is "False".. Please enable it...