java – AES加密Android < - > iOS不同的结果,消息长度> 15字节

我在理解两个设备上的密码/加密器时遇到了一个真正的问题.

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, 0, keyBytes, 0, 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！

解决方法:

检查两个系统上正在使用的填充.不同的填充将导致不同的输出.不要依赖默认值,而是明确设置两侧的填充.您的第二个代码片段显式设置PKCS7填充.在两端使用它.

作为一般规则,不要依赖于不同系统之间的默认值.明确设置IV,模式,填充,随机数或其他任何需要的东西.即使最微小的细节不匹配,加密也会失败.