AES Decryption in objective c where encryption in .net - ios

Question

Hello friends I stuck in decryption of data. Server side data is encrypted by .net, i tried many codes but unable to decrypt.
In android data is decrypted by this function
public static String doDecrypt(String data, String key){
String decryptedData = null;
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
byte[] keyBytes = new byte[16];
byte[] b = key.getBytes("UTF-8");
int len = b.length;
if (len > keyBytes.length)
len = keyBytes.length;
System.arraycopy(b, 0, keyBytes, 0, len);
SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(keyBytes);
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
byte[] results = new byte[data.length()];
try {
results = cipher.doFinal(Base64.decode(data,Base64.DEFAULT));
} catch (Exception e) {
Log.i("Erron in Decryption", e.toString());
}
Log.i("Data", new String(results, "UTF-8"));
decryptedData = new String(results, "UTF-8");
}
catch (Exception e) {
e.printStackTrace();
return null;
}
return decryptedData;
}
its working fine in android, but while decrypting in objective c its gives only null.
I used some link that are below:-
nsdata , fwencryption , RNCryptor
But it only gives null value when decrypting in NSString.
For example you can check a demo for decryption
data:-1YbDEEZGnc5EtZY040AaSP233AXZHJVAZb74sCQHm+BX72N5nM81ygDsRHhF8KMk
key- test#123456789
I used this code in Objective c
#import "ViewController.h"
#import "NSData+AES.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSString *testData = [self decode:#"1YbDEEZGnc5EtZY040AaSP233AXZHJVAZb74sCQHm+BX72N5nM81ygDsRHhF8KMk"];
NSLog(#"Dtata%#",testData);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(NSString*)encode:(NSString*)plainString {
//convert 'plainString' to NSData using NSUTF8StringEncoding
NSData *plainData = [plainString dataUsingEncoding:NSUTF8StringEncoding];
//encrypt data with AES encryption
NSData *AESData = [plainData AES128EncryptedDataWithKey:#"test#123456789"];
//return base64 encoded string
return [AESData base64EncodedStringWithOptions:0];
}
-(NSString*)decode:(NSString*)encodedString {
//convert 'encodedString' to base64 decoded data
NSData *base64Data = [[NSData alloc] initWithBase64EncodedString:encodedString options:0];
//decode using AES encryption
NSData *AESData = [base64Data AES128DecryptedDataWithKey:#"test#123456789"];
//return string from AES decoded data
return [[NSString alloc] initWithData:AESData encoding:NSUTF8StringEncoding];
}
Please anyone can help me out. I am stuck in this.Thanks in advance.