AES/CBC/PKCS5Padding in iOS objective c result differs from Android

Question

I am using the AES/CBC/PKCS5Padding in Android application. Code is like-

    private static String TRANSFORMATION = \"AES/CBC/PKCS5Padding\";

    private s         


        

Answer 1

everyone I hope is not too late...

After spending time dealing with this, I got success in ANDROID(java) and IOS (Objc) using AES with the codes below:

ANDROID CODE

    import java.io.IOException;
    import java.security.InvalidAlgorithmParameterException;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;

    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;

    public class SecurityUtils {

        private static final String ALGORITHM = "AES";
        private static final String MODE = "AES";
        private static final String IV = "AEE0715D0778A4E4";
        private static final String KEY= "9336365521W5F092BB5909E8E033BC69";

        public static  String encrypt(String value ) throws NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException, InvalidKeyException {
            SecretKeySpec secretKeySpec = new SecretKeySpec(KEY.getBytes(), ALGORITHM);
            Cipher cipher = Cipher.getInstance(MODE);
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, new IvParameterSpec(IV.getBytes()));
            byte[] values = cipher.doFinal(value.getBytes());
            return Base64.encodeBytes(values);
        }

        public static  String decrypt(String value) throws IOException, NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException, InvalidKeyException {
            byte[] values = Base64.decode(value);
            SecretKeySpec secretKeySpec = new SecretKeySpec(KEY.getBytes(), ALGORITHM);
            Cipher cipher = Cipher.getInstance(MODE);
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, new IvParameterSpec(IV.getBytes()));
            return new String(cipher.doFinal(values));
        }
    }

TESTING ANDROID

   try {
        String encrypted = SecurityUtils.encrypt("My Secret Text");
        String decrypted = SecurityUtils.decrypt(encrypted);
        Log.e("encrypted", encrypted);
        Log.e("decrypted", decrypted);
    }catch(Exception ex){
        Log.e("AES", ex.getMessage());
    }

IOS CODE

Header file

#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonCryptor.h>

NS_ASSUME_NONNULL_BEGIN

@interface SecurityUtils : NSObject

+ (NSString *)encrypt:(NSString *)plainText error:(NSError **)error;
+ (NSString *)decrypt:(NSString *)plainText error:(NSError **)error;

@end

NS_ASSUME_NONNULL_END

Implementation file

NSString *const IV = @"AEE0515D0B08A4E4";
NSString *const KEY =  @"9336565521E5F082BB5929E8E033BC69";


#import "SecurityUtils.h"


@implementation SecurityUtils


+ (NSString *)encrypt:(NSString *)plainText error:(NSError **)error {
    NSMutableData *result =  [SecurityUtils doAES:[plainText dataUsingEncoding:NSUTF8StringEncoding] context: kCCEncrypt error:error];
    return [result base64EncodedStringWithOptions:0];
}


+ (NSString *)decrypt:(NSString *)encryptedBase64String error:(NSError **)error {
    NSData *dataToDecrypt = [[NSData alloc] initWithBase64EncodedString:encryptedBase64String options:0];
    NSMutableData *result = [SecurityUtils doAES:dataToDecrypt context: kCCDecrypt error:error];
    return [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];

}

+ (NSMutableData *)doAES:(NSData *)dataIn context:(CCOperation)kCCEncrypt_or_kCCDecrypt error:(NSError **)error {
        CCCryptorStatus ccStatus   = kCCSuccess;
        size_t          cryptBytes = 0;
        NSMutableData  *dataOut    = [NSMutableData dataWithLength:dataIn.length + kCCBlockSizeBlowfish];
        NSData *key =[KEY dataUsingEncoding:NSUTF8StringEncoding];
        NSData *iv = [IV dataUsingEncoding:NSUTF8StringEncoding];

        ccStatus = CCCrypt( kCCEncrypt_or_kCCDecrypt,
                           kCCAlgorithmAES,
                           kCCOptionPKCS7Padding,
                           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;
}


@end

IOS TESTING

NSError *error;
NSString *encrypted = [SecurityUtils encrypt:@"My Secret Text" error:&error];
NSLog(@"encrypted: %@",encrypted);
NSLog(@"decrypted: %@",[SecurityUtils decrypt:encrypted error:&error]);

Finally, the tests outputs:

ANDROID OUTPUT

2019-05-16 21:35:01.215 4920-4920/br.com.my.app E/encrypted: EJ41am5W1k6fA7ygFjTSEw==
2019-05-16 21:35:01.215 4920-4920/br.com.my.app E/decrypted: My Secret Text

IOS OUTPUT

2019-05-16 21:38:02.947043-0300 MyApp[63392:1590665] encrypted: EJ41am5W1k6fA7ygFjTSEw==
2019-05-16 21:38:02.947270-0300 MyApp[63392:1590665] decrypted: My Secret Text

My repo on github with this examples: https://github.com/juliancorrea/aes-crypto-android-and-ios