Hashing Functions in Multiple Languages / Environments

gistfile1.txt

// # Assume salt, password, and encodedPassword are all strings.
// # If you don't have a salt, just have a random number generator spit out > 16B of data, and turn that into a string.

// Java - SHA256 with Salt
import java.security.MessageDigest;
import sun.misc.BASE64Encoder;

MessageDigest digest = MessageDigest.getInstance("SHA-256");
digest.reset();

byte[] byteBuffer = digest.digest((password + salt).getBytes("UTF-8"));
for (int i = 0; i < ITERATION_COUNT; i++)
{
    digest.reset();
    byteBuffer = digest.digest(byteBuffer);
}

BASE64Encoder coder = new BASE64Encoder();
encodedPassword = coder.encode(byteBuffer);

// Javascript - SHA256 with Salt
<script src="http://crypto-js.googlecode.com/svn/tags/3.0.2/build/rollups/hmac-sha256.js"></script>
<script>
    encodedPassword = CryptoJS.HmacSHA256(password + salt).toString();
</script>

# PHP - SHA256 with Salt
encodedPassword = hash("sha256", password.salt);

# Python - SHA256 with Salt
import hashlib
encodedPassword = hashlib.sha256(password + salt).hexdigest()

// Objective-C SHA256 with Salt
#include <CommonCrypto/CommonDigest.h>
unsigned char hashedCharacters[CC_SHA256_DIGEST_LENGTH];
NSMutableData *passwordData = [[password dataUsingEncoding: NSUTF8StringEncoding] mutableCopy];
[passwordData appendData: [salt dataUsingEncoding: NSUTF8StringEncoding]];

CC_SHA256([passwordData bytes], [passwordData length], hashedCharacters);
encodedPassword = [NSString stringWithUTF8String: hashedCharacters];

Hello,
I used this example in Python and Objective-c but in Objective-c this returned me "null". I copied exactly your example with password "1234" and salt "salt".
Thanks!