java – AES加密Android < - > iOS不同的结果,消息长度&gt

1.
如果我们使用Cipher AES加密iOS和Android上的消息并且字符串的charlength不大于16(例如“abcdefghijklmno”),我们在使用相同的密钥/密码加密后得到相同的结果.

2.
但是如果需要更长的消息,我们会在iOS和Android上获得不同的结果(例如“abcdefghijklmnop”)

我做了很多研究如何为这两种设备获得相同的参数,起初我认为它是安全的.

这是我用于加密的密码：

public String encode(Context context,String password,String text)
        throws NoPassGivenException,NoTextGivenException {
    if (password.length() == 0 || password == null) {
        throw new NoPassGivenException("Please give Password");
    }

    if (text.length() == 0 || text == null) {
        throw new NoTextGivenException("Please give text");
    }

    try {
        SecretKeySpec skeySpec = getKey(password);
        byte[] clearText = text.getBytes("UTF8");


        //IMPORTANT TO GET SAME RESULTS ON iOS and ANDROID
        final byte[] iv = new byte[16];
        Arrays.fill(iv,(byte) 0x00);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);

        // Cipher is not thread safe
                    //EDITED AFTER RIGHT ANSWER FROM
                    //*** Cipher cipher = Cipher.getInstance("AES");   ***//
                    // TO  
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");


        cipher.init(Cipher.ENCRYPT_MODE,skeySpec,ivParameterSpec);

        String encrypedValue = Base64.encodeToString(
                cipher.doFinal(clearText),Base64.DEFAULT);
        Log.d(TAG,"Encrypted: " + text + " -> " + encrypedValue);
        return encrypedValue;

    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    }
    return "";
}


public SecretKeySpec getKey(String password)
        throws UnsupportedEncodingException {


    int keyLength = 128;
    byte[] keyBytes = new byte[keyLength / 8];
    // explicitly fill with zeros
    Arrays.fill(keyBytes,(byte) 0x0);

    // if password is shorter then key length,it will be zero-padded
    // to key length
    byte[] passwordBytes = password.getBytes("UTF-8");
    int length = passwordBytes.length < keyBytes.length ? passwordBytes.length
            : keyBytes.length;
    System.arraycopy(passwordBytes,keyBytes,length);
    SecretKeySpec key = new SecretKeySpec(keyBytes,"AES");
    return key;
}

这是我的同事的iOS挂件：

- (NSData *)AES128EncryptWithKey:(NSString *)key {

    // 'key' should be 32 bytes for AES256,// 16 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)

    // insert key in char array
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSUInteger dataLength = [self length];
    size_t bufferSize = dataLength + kCCBlockSizeAES128;
    void *buffer = malloc(bufferSize);

    size_t numBytesEncrypted = 0;

    // the encryption method,use always same attributes in android and iPhone (f.e. PKCS7Padding)
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyPtr,kCCKeySizeAES128,NULL                      /* initialization vector (optional) */,[self bytes],dataLength,/* input */
                                          buffer,bufferSize,/* output */
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {

        return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
    }

    free(buffer);
    return nil;
}

我真的很想了解差异是什么以及如何避免它.与更大的字符串超过15个字符的测试给了我一个提示,但我不知道为什么:)

先谢谢你们！