encrypting in Objective-C decrypting nodejs - objective-c

Question

I'm encrypting some text i want to send to a server and I have no problems encrypting it, and decrypting it in Objective-C but when I send it to the nodejs server the result by decrypting it never comes right the encrypted data comes always the same... I think the problem is how I use the crypto library, here's my Xcode code:
NSString * key =#"1234567890123456";
NSString * url = #"http://flystory.herokuapp.com/register";
NSString *post = #"hola mundo!!!!!!!!!!";
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSLog(#"%#",[[NSString alloc] initWithData:postData encoding:NSASCIIStringEncoding]);
NSError *e;
CCCryptorStatus err;
postData = [postData dataEncryptedUsingAlgorithm:kCCAlgorithmAES128 key:key options:kCCOptionECBMode error:&err];
NSLog(#"%#",[[NSString alloc] initWithData:postData encoding:NSASCIIStringEncoding]);
NSString *postLength = [NSString stringWithFormat:#"%d", [postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:url]];
[request setHTTPMethod:#"post"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"body" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse *r, NSData *d, NSError *e) {
if (e) NSLog(#"%#",e.description);
else [self handleRespondedData:d];
}];
postData = [postData decryptedDataUsingAlgorithm:kCCAlgorithmAES128 key:key options:kCCOptionECBMode error:&err];
NSLog(#"%#",[[NSString alloc] initWithData:postData encoding:NSASCIIStringEncoding]);
to encrypt I'm using this NSData extension contained in the NSData+CommonCrypto.h/m in https://github.com/Gurpartap/AESCrypt-ObjC
my Node.JS code goes as follows:
var express = require("express");
var app = express(express.bodyParser());
//...
app.post("*", function(request, response) {
var body = '';
request.setEncoding('hex');
request.on('data', function (data) {
body += data;
var crypto=require('crypto');
var decipher=crypto.createDecipher('aes-128-ecb', '1234567890123456');
decipher.setAutoPadding(auto_padding=false);
var enc = decipher.update(body, 'hex', 'utf8') + decipher.final('utf8');
console.log('encrypted: ' + body);
console.log('decrypted: ' + enc);
});
request.on('end', function () {
// use POST
route(handle, request.path, response, body);
});
});