implementing PBEKeySpec encryption into IOS - objective-c

Question

This is my java code. Now I want to implement same functionality in Objective-C.
int dkLen = 16;
int rounds = 1000;
PBEKeySpec keySpec = new PBEKeySpec(hashKey.toCharArray(),salt.getBytes(), rounds, dkLen * 8);
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
return factory.generateSecret(keySpec).getEncoded();
This is my iOS implementation
- (void)getHashKey {
NSString *hash_key=#"MY_HASHKEY";
NSString *saltKey = #"MY_SALTKEY";
int dkLen = 16;
NSData *keyData = [hash_key dataUsingEncoding:NSUTF8StringEncoding];
NSData *salt = [saltKey dataUsingEncoding:NSUTF8StringEncoding];
uint rounds = 1000;
uint keySize = kCCKeySizeAES128;
NSMutableData *derivedKey = [NSMutableData dataWithLength:keySize];
CCKeyDerivationPBKDF(kCCPBKDF2, // algorithm
keyData.bytes, // password
keyData.length, // passwordLength
salt.bytes, // salt
salt.length, // saltLen
kCCPRFHmacAlgSHA1, // PRF
rounds, // rounds
derivedKey.mutableBytes, // derivedKey
dkLen*8); // derivedKeyLen
NSString *myString = [[NSString alloc] initWithData:derivedKey encoding:NSASCIIStringEncoding];
NSLog(#"derivedKey: %#", myString);
}
Is there any problem with algorithm which i am using in iOS

Answer 1

Use the Common Crypto CCKeyDerivationPBKDF function with the option kCCPRFHmacAlgSHA1.
Note PBEKeySpec keyLength is in bits, CCKeyDerivationPBKDF derivedKeyLen is in bytes.
For a more detailed answer provide all input (hashKey, salt) and the output in hex dump format plus the number of rounds, output length in bytes.
See this SO answer for sample code.
Update for revised question code:
CCKeyDerivationPBKDF returns 8-bit data bytes that is essentially not characters and many are not printable even if forced into NSASCIIStringEncoding. Forcing to NSASCIIStringEncoding even if there is no error returned is incorrect and non-useful. Instead either use the returned NSData or convert to Base64 or HexASCII encoding.
Change
NSString *myString = [[NSString alloc] initWithData:derivedKey encoding:NSASCIIStringEncoding];
Output: A´Öº÷"ùïó
to
NSString * myString = [derivedKey base64EncodedStringWithOptions:0];
Output: QbTWgbr3FSL57/MfBQAz4A==
Note: 1000 rounds is generally considered insufficient, something in the 10,000 to 100,000 range should be used.
Timings on an iPhone 6S:
rounds seconds
1000 0.003
10000 0.032
100000 0.309
1000000 3.047