How to implement Blowfish CBC algorithm PKCS5 Padding in iOS [duplicate] - ios

Question

I have googled a lot but enable to get Blowfish ECB algorithm with PKCS5 padding in Objective-C.
I have tried code from here but it is not giving me proper encrypted data. Even I have tried codes from here but it is not with PKSC5 padding.
Unfortunately I have to use Blowfish (no other option) to convert following JAVA code in Objective-C
String objVal=<the json>;
SecretKeySpec lKeySpec = new SecretKeySpec(lKey.getBytes("UTF8"),"Blowfish");
Cipher lCipher = Cipher.getInstance("Blowfish/ECB/PKCS5Padding");
lCipher.init(Cipher.ENCRYPT_MODE, lKeySpec);
byte[] lPassword = objVal.getBytes("UTF8");
byte[] lEncryptPassword = lCipher.doFinal(lPassword);
String lEncryptString = new BASE64Encoder().encode(lEncryptPassword);
StringBuffer nString = new StringBuffer();
for (int i = 0; i < lEncryptString.length(); i++) {
int a = lEncryptString.charAt(i);
if (a != 13 && a != 10 && !lEncryptString.substring(i, i + 1).equals(" ")){
nString.append(lEncryptString.charAt(i));
}
return nString.toString();
Then the encrypted json is encoded:
String returnData=<encrypted json>
byte[] inputBytes = returnData.getBytes();
returnData  = DatatypeConverter.printBase64Binary(inputBytes);
Any one has tried and tested solution for Blowfish ECB algorithm with PKSC5 padding.
Thank you in advance.
I know this question is already (several times) asked but either not answered or not with PKCS5 padding

Answer 1

Example code:
Add Security.framework
#import <CommonCrypto/CommonCryptor.h>
+ (NSData *)doBlowfish:(NSData *)dataIn
context:(CCOperation)kCCEncrypt_or_kCCDecrypt
key:(NSData *)key
options:(CCOptions)options
iv:(NSData *)iv
error:(NSError **)error
{
CCCryptorStatus ccStatus = kCCSuccess;
size_t cryptBytes = 0;
NSMutableData *dataOut = [NSMutableData dataWithLength:dataIn.length + kCCBlockSizeBlowfish];
ccStatus = CCCrypt( kCCEncrypt_or_kCCDecrypt,
kCCAlgorithmBlowfish,
options,
key.bytes,
key.length,
(iv)?nil:iv.bytes,
dataIn.bytes,
dataIn.length,
dataOut.mutableBytes,
dataOut.length,
&cryptBytes);
if (ccStatus == kCCSuccess) {
dataOut.length = cryptBytes;
}
else {
if (error) {
*error = [NSError errorWithDomain:#"kEncryptionError"
code:ccStatus
userInfo:nil];
}
dataOut = nil;
}
return dataOut;
}
Test:
NSError *error;
NSData *key = [#"Blowfish" dataUsingEncoding:NSUTF8StringEncoding];
NSString *stringOriginal = #"TestData";
NSData *dataOriginal = [stringOriginal dataUsingEncoding:NSUTF8StringEncoding];;
NSLog(#"key %#", key);
NSLog(#"stringOriginal %#", stringOriginal);
NSLog(#"dataOriginal %#", dataOriginal);
NSData *dataEncrypted = [Test doBlowfish:dataOriginal
context:kCCEncrypt
key:key
options:kCCOptionPKCS7Padding | kCCOptionECBMode
iv:nil
error:&error];
NSLog(#"dataEncrypted %#", dataEncrypted);
NSString *encryptedBase64String = [dataEncrypted base64EncodedStringWithOptions:0];
NSLog(#"encryptedBase64String %#", encryptedBase64String);
NSData *dataToDecrypt = [[NSData alloc] initWithBase64EncodedString:encryptedBase64String options:0];
NSData *dataDecrypted = [Test doBlowfish:dataToDecrypt
context:kCCDecrypt
key:key
options:kCCOptionPKCS7Padding | kCCOptionECBMode
iv:nil
error:&error];
NSLog(#"dataDecrypted %#", dataDecrypted);
NSString *stringDecrypted = [[NSString alloc] initWithData:dataDecrypted encoding:NSUTF8StringEncoding];
NSLog(#"stringDecrypted %#", stringDecrypted);
Output:
key 426c6f77 66697368
stringOriginal TestData
dataOriginal 54657374 44617461
dataEncrypted ba5eb956 7e73ae1a b5513ea1 75a14019
encryptedBase64String ul65Vn5zrhrdmeYV9B5rQA==
dataDecrypted 54657374 44617461
stringDecrypted TestData