AES负字节

本文介绍了AES负字节的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

以下是在Java中使用AES加密的摘录：

The following is an extract from using AES encryption in Java:

  encryptedData =   encryptCipher.doFinal(strToEncrypt.getBytes());

以下是c＃中的摘录

 DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV);

两者都使用一个字节数组来加密另一个解密，Java加密中的加密产生一些负数值存储在字节数组中。

Both use a byte array one to encrypt the other to decrypt, the encryption in Java encrypts producing some negative values stored in a byte array.

C＃使用字节数组进行解密，但C＃中的字节被定义为仅包含0..255之内的数字-Java定义了它的值字节类型为-128到127。

C# uses a byte array to decrypt but a byte in C# is defined as only containing the numbers from 0..255 - Java defines its Byte type as -128 to 127.

因此，我无法将加密的数据发送到用C＃编写的远程应用程序，因为它无法使用已经使用过的字节数组进行解密

Therefore, I cannot send encrypted data to the remote application which is written in C# because it cannot decrypt using the byte array that has been sent from the Java aplication.

有人能提出一种解决方案，让我告诉Java加密时不产生负数吗？

Has anyone come up with a solution that would allow me to tell java not to produce negative numbers when encrypting?

代码来自Micrsoft，MemoryStream要求byte []为加密代码创建流...
如前所述，我用sbyte替换了byte []，但是无用，因为MemoryStream需要byte []

The code is from Micrsoft, the MemoryStream requires the byte[] to create the stream for the crypto code...As mentioned or not, I replaced byte[] with sbyte but to no avail as MemoryStream requires byte[]

static string DecryptStringFromBytes_Aes(sbyte[] cipherText, byte[] Key, byte[] IV)
    {
        // Check arguments. 
        if (cipherText == null || cipherText.Length <= 0)
            throw new ArgumentNullException("cipherText");
        if (Key == null || Key.Length <= 0)
            throw new ArgumentNullException("Key");
        if (IV == null || IV.Length <= 0)
            throw new ArgumentNullException("Key");

        // Declare the string used to hold 
        // the decrypted text. 
        string plaintext = null;

        // Create an Aes object 
        // with the specified key and IV. 
        using (Aes aesAlg = Aes.Create())
        {
            aesAlg.Key = Key;
            aesAlg.IV = IV;

            // Create a decrytor to perform the stream transform.
            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

            // Create the streams used for decryption. 
            using (MemoryStream msDecrypt = new MemoryStream((byte)cipherText))
            {
                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                    {


                        // Read the decrypted bytes from the decrypting stream
                        // and place them in a string.
                        plaintext = srDecrypt.ReadToEnd();
                    }
                }
            }

        }

        return plaintext;


    }

Byte

AES负字节

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