Question

我正准备在服务器端（c＃）进行加密，并在android side（Java）中为我的api密钥解密。 C＃中的加密/解密都可以。而且，在Java中，加密/解密也都可以。主要问题是使用C＃生成的密文与Java不同，尽管我使用了相同的密钥。 C＃生成的密文无法在Java中解密。我尝试如下。

在Java中

 public static String key = "aaaaaaaabbccccbbaaaaaaaabbccccbb";
    private static byte[] key_Array = Base64.decode(key,Base64.DEFAULT);

    public static String encrypt(String plainText)
    {
        try
        {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");

            // Initialization vector.
            // It could be any value or generated using a random number generator.
            byte[] iv = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
            IvParameterSpec ivspec = new IvParameterSpec(iv);

            Key secretKey = new SecretKeySpec(key_Array, "AES");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec);

            return Base64.encodeToString(cipher.doFinal(plainText.getBytes()),Base64.DEFAULT);
        }
        catch (Exception e)
        {
            System.out.println("[Exception]:"+e.getMessage());
        }
        return null;
    }

    public static String decrypt(String encryptedMessage)
    {
        try
        {
            //Cipher _Cipher = Cipher.getInstance("AES");
            //Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");

            // Initialization vector.
            // It could be any value or generated using a random number generator.
            byte[] iv = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
            IvParameterSpec ivspec = new IvParameterSpec(iv);

            Key SecretKey = new SecretKeySpec(key_Array, "AES");
            _Cipher.init(Cipher.DECRYPT_MODE, SecretKey, ivspec);

            byte decodedMessage[] = Base64.decode(encryptedMessage,Base64.DEFAULT);
            return new String(_Cipher.doFinal(decodedMessage));

        }
        catch (Exception e)
        {
            System.out.println("[Exception]:"+e.getMessage());

        }
        return null;
    }

在C＃中

public class Crypt
    {
        // C# Code, CipherMode.CBC
        // CBC version need Initialization vector IV.

        public static string keyStr = "aaaaaaaabbccccbbaaaaaaaabbccccbb";
                                      // FFClY170hLrhsDnKUEhJ4FhVOnrpNNFFClY170hLrhsDnKUE
        public static string Encrypt(string PlainText)
        {
            RijndaelManaged aes = new RijndaelManaged();
            aes.BlockSize = 128;
            aes.KeySize = 256;

            // It is equal in java 
            /// Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");    
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.PKCS7;

            byte[] keyArr = Convert.FromBase64String(keyStr);
            byte[] KeyArrBytes32Value = new byte[32];
            Array.Copy(keyArr, KeyArrBytes32Value, 24);

            // Initialization vector.   
            // It could be any value or generated using a random number generator.
            byte[] ivArr = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
            byte[] IVBytes16Value = new byte[16];
            Array.Copy(ivArr, IVBytes16Value, 16);

            aes.Key = KeyArrBytes32Value;
            aes.IV = IVBytes16Value;

            ICryptoTransform encrypto = aes.CreateEncryptor();

            byte[] plainTextByte = ASCIIEncoding.UTF8.GetBytes(PlainText);
            byte[] CipherText = encrypto.TransformFinalBlock(plainTextByte, 0, plainTextByte.Length);
            return Convert.ToBase64String(CipherText);

        }

        public static string Decrypt(string CipherText)
        {
            RijndaelManaged aes = new RijndaelManaged();
            aes.BlockSize = 128;
            aes.KeySize = 256;

            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.PKCS7;

            byte[] keyArr = Convert.FromBase64String(keyStr);
            byte[] KeyArrBytes32Value = new byte[32];
            Array.Copy(keyArr, KeyArrBytes32Value, 24);

            // Initialization vector.   
            // It could be any value or generated using a random number generator.
            byte[] ivArr = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
            byte[] IVBytes16Value = new byte[16];
            Array.Copy(ivArr, IVBytes16Value, 16);

            aes.Key = KeyArrBytes32Value;
            aes.IV = IVBytes16Value;

            ICryptoTransform decrypto = aes.CreateDecryptor();

            byte[] encryptedBytes = Convert.FromBase64CharArray(CipherText.ToCharArray(), 0, CipherText.Length);
            byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
            return ASCIIEncoding.UTF8.GetString(decryptedData);
        }
    }

Java输出

纯文本：hla hla

密文：MW6b3AIpNw5RLmhvAro1Yg ==

C＃输出

纯文本：hla hla

密文：qsHRHy05GbRv5Q1QNOUlZQ ==

任何想法或替代方式将不胜感激。谢谢。

Answer 1

问题在于，在Java代码中，您仅使用192位密钥，而在C＃版本中，您在使用256位密钥。

您的base64编码密钥为32个字符，转换为24个字节，仅为192位。

这些是Java中令人反感的行：

public static String key = "aaaaaaaabbccccbbaaaaaaaabbccccbb"; // 32 characters
private static byte[] key_Array = Base64.decode(key, Base64.DEFAULT); // 24 bytes

只需更改Java键数组的创建即可解决问题。像这样：

public static String key = "aaaaaaaabbccccbbaaaaaaaabbccccbb"; // 32 characters
private static byte[] key_Array = new byte[32]; // 32 bytes

static {
    // copy the 24 base64-decoded bytes to the key array
    System.arraycopy(Base64.decode(key, Base64.DEFAULT), 0, key_Array, 0, 24);
}

使用相同的密钥在C＃中进行加密并在Java中进行解密

1 个答案: