用Java解密Objy-C加密的AES数据

我尝试用Java中的Objtovi-C解密原始加密的数据。

There are other questions mentioning this but they are really cluttered and many of them aren't solved yet therefore I will post my own.

这是加密数据的代码:

  - (int) encryptWithKey: (NSString *) key
    {
    // 'key' should be 32 bytes for AES256, will be null-padded otherwise
    char * keyPtr[kCCKeySizeAES128+1]; // room for terminator (unused)
    bzero( keyPtr, sizeof(keyPtr) ); // fill with zeroes (for padding)

    // fetch key data
    [key getCString: keyPtr maxLength: sizeof(keyPtr) encoding: NSUTF8StringEncoding];

    // encrypts in-place, since this is a mutable data object
    size_t numBytesEncrypted = 0;
    CCCryptorStatus result = CCCrypt( kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, 
                                     keyPtr, kCCKeySizeAES128,
                                     NULL /* initialization vector (optional) */, 
                                     [self mutableBytes], [self length], /* input */
                                     [self mutableBytes], [self length]+32, /* output */
                                     &numBytesEncrypted );
    return numBytesEncrypted;
}

我执行此函数,并用此代码将结果数据写入光盘:

NSString* strTest = @"Hallo Welt!";
NSLog(@"strTest = %@", strTest);

NSMutableData *protectedData = [NSMutableData dataWithData:[strTest dataUsingEncoding:NSUTF8StringEncoding]];

int laenge = [protectedData encryptWithKey:@"keykeykeykeykeykeykeykey"];

NSData* dataOutput = [[NSData alloc] initWithBytes:[protectedData bytes] length:laenge];


[dataOutput writeToFile:@"/encryptedFileObjC" atomically:YES];

在Java中,我使用此代码尝试实现相同的行为:

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
String keyString = "keykeykeykeykeykeykeykey";
byte[] keyBytes = keyString.getBytes("UTF-8");

cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(keyBytes, "AES"),
        new IvParameterSpec(new byte[16]));
byte[] resultBytes = cipher.doFinal("Hallo Welt!".getBytes("UTF8"));

FileOutputStream out =
        new FileOutputStream(new File("encryptedFileJava"));
out.write(resultBytes);
out.close();

如果我现在尝试解密通过Objective-C加密的文件,我会得到一个糟糕的填充异常。如果我打开两个加密内容的文件,它们是不同的:

哈啰!用Java加密: 96 C5 CB 51 39 B5 27 FB B3 93 BF 92 18 BB 16 9B
哈啰!用objc加密: A3 61 32 8E A5 E6 66 E0 41 64 89 25 62 D3 21 16

文件内容不应该相同吗?我认为在两种语言中,算法的所有参数都不相同。

我需要修改Java代码以获得与Objtovi-C代码相同的结果,以便能够解密用Objtovi-C加密的一些数据。