Java Android加密与C#Unity解密

Question

此刻，我的java类可以加密和解密他自己的数据。我的C#也可以做同样的事情。问题是，我的C#代码不能解密java先前加密的内容。我100%确定他们有相同的密钥（打印了一个日志，所以比较和它是一样的）。我在java和C#中的加密似乎有些不同。

下面是我在尝试用C#解密之前由Java加密的内容时遇到的错误：

    03-22 13:32:57.034 14264 14351 E Unity   : CryptographicException: Bad PKCS7 padding. Invalid length 197.
    03-22 13:32:57.034 14264 14351 E Unity   :   at Mono.Security.Cryptography.SymmetricTransform.ThrowBadPaddingException (PaddingMode padding, Int32 length, Int32 position) [0x00000] in <filename unknown>:0
    03-22 13:32:57.034 14264 14351 E Unity   :   at Mono.Security.Cryptography.SymmetricTransform.FinalDecrypt (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) [0x00000] in <filename unknown>:0
    03-22 13:32:57.034 14264 14351 E Unity   :   at Mono.Security.Cryptography.SymmetricTransform.TransformFinalBlock (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) [0x00000] in <filename unknown>:0
    03-22 13:32:57.034 14264 14351 E Unity   :   at System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) [0x00000] in <filename unknown>:0
    03-22 13:32:57.034 14264 14351 E Unity   :   at GoogleReader.Decrypt (System.String text) [0x00000] in <filename unknown>:0

JAVA代码：

public static String key;

public static String Crypt(String text)
{       
    try
    {
        // Get the Key
        if(com.UQAC.OceanEmpire.UnityPlayerActivity.myInstance != null){
            key = Base64.encodeToString(com.UQAC.OceanEmpire.UnityPlayerActivity.myInstance.key.getEncoded(),Base64.DEFAULT);
            com.UQAC.OceanEmpire.UnityPlayerActivity.myInstance.SendMessageToUnity(key);
        } else {
            return "";
        }
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7PADDING");

        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(Base64.decode(key,Base64.DEFAULT), "AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec);

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

public static String Decrypt(String text)
{
    try
    {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7PADDING");

        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(Base64.decode(key,Base64.DEFAULT), "AES");
        cipher.init(Cipher.DECRYPT_MODE, SecretKey, ivspec);

        byte DecodedMessage[] = Base64.decode(text, Base64.DEFAULT);
        return new String(cipher.doFinal(DecodedMessage));
    }
    catch (Exception e)
    {
        System.out.println("[Exception]:"+e.getMessage());
    }
    return null;
}

public static string keyStr;

public static string Decrypt(string text)
    {
        RijndaelManaged aes = new RijndaelManaged();
        aes.BlockSize = 128;
        aes.KeySize = 256;
        aes.Mode = CipherMode.ECB;
        //aes.Padding = PaddingMode.None;

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

        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, Math.Min(ivArr.Length, IVBytes16Value.Length));

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

        ICryptoTransform decrypto = aes.CreateDecryptor();

        byte[] encryptedBytes = Convert.FromBase64CharArray(text.ToCharArray(), 0, text.Length);

        byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);

        return Encoding.UTF8.GetString(decryptedData);
    }

    public static string Encrypt(string text)
    {
        RijndaelManaged aes = new RijndaelManaged();
        aes.BlockSize = 128;
        aes.KeySize = 256;
        aes.Mode = CipherMode.ECB;

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

        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, Math.Min(ivArr.Length, IVBytes16Value.Length));

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

        ICryptoTransform encrypto = aes.CreateEncryptor();

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

Original String : Hello World
Crypted : 7Zmd4yvxgR6Mg0nUDQumBA==
Decrypted : Hello World

Original String : Hello World
Crypted : zQjSpJqU8YkHhMDHw8wuTQ==
Decrypted : Hello World

FuVf/CNYkHdyBqejq3eoHQ==

Answer 1

找到解决办法了！一切正常。

在遵循一些提示之后，下面是修复方法：

>

确保一切都在欧洲央行。在Java中具有以下内容：

Cipher cipher = Cipher.getInstance("AES");