c# - RijndaelManaged 无法解密

Question

代码可在以下网址找到：http: //pastebin.com/3Yg5bHra

我的问题是，当我解密时，什么都没有返回。没有任何东西被解密。

它在 111-114 行附近的某个地方出错。cryptoStream (csDecrypt) 是空的，尽管我将数据放入内存流 (msDecrypt)

编辑 Nudier 想出了一个解决方案

Answer 1

//Function for encrypting propose
static string SymmetricEncryption(string str, byte[] key, byte[] IV)
{

MemoryStream ms = new MemoryStream();

try
{

//---creates a new instance of the RijndaelManaged class---
RijndaelManaged RMCrypto = new RijndaelManaged();

//---creates a new instance of the CryptoStream class---
CryptoStream cryptStream =new CryptoStream(ms, RMCrypto.CreateEncryptor(key, IV),

CryptoStreamMode.Write);

StreamWriter sWriter = new StreamWriter(cryptStream);

//---encrypting the string---
sWriter.Write(str);

sWriter.Close();

cryptStream.Close();

//---return the encrypted data as a string---
return System.Convert.ToBase64String(ms.ToArray());

}
catch (Exception ex)

{
Console.WriteLine(ex.ToString());

return (String.Empty);
}

}


//Function for Decrypting propose
static string SymmetricDecryption(string str, byte[] key, byte[] IV)
{

try

{

//---converts the encrypted string into a byte array---
byte[] b = System.Convert.FromBase64String(str);

//---converts the byte array into a memory stream for decryption---
MemoryStream ms = new MemoryStream(b);

//---creates a new instance of the RijndaelManaged class---
RijndaelManaged RMCrypto = new RijndaelManaged();

//---creates a new instance of the CryptoStream class---
CryptoStream cryptStream = new CryptoStream(ms, RMCrypto.CreateDecryptor(key, IV),

CryptoStreamMode.Read);

//---decrypting the stream---
StreamReader sReader = new StreamReader(cryptStream);

//---converts the decrypted stream into a string---
String s = sReader.ReadToEnd();

sReader.Close();

return s;

}
catch (Exception ex)
{

Console.WriteLine(ex.ToString());

return String.Empty;

}

}



//Main function execute the functions
RijndaelManaged RMCrypto = new RijndaelManaged();

//---generate key---
RMCrypto.GenerateKey();

byte[] key = RMCrypto.Key;

Console.WriteLine(“Key : “ + System.Convert.ToBase64String(key));

//---generate IV---
RMCrypto.GenerateIV();

byte[] IV = RMCrypto.IV;
Console.WriteLine(“IV : “ + System.Convert.ToBase64String(IV));

//---encrypt the string---
string cipherText = SymmetricEncryption(“This is a test string.”, key, IV);

Console.WriteLine(“Ciphertext: “ + cipherText);

//---decrypt the string---
Console.WriteLine(“Original string: “ + SymmetricDecryption(cipherText, key, IV));

Answer 2

记得设置加密和解密的密钥以及 de IV(Initialization Vector)

Answer 3

     public AesData GetAesData()
    {

        //Before assigned the key and IV you have to generate it first this way.

        _rijndaelObj.GenerateKey();

        _rijndaelObj.GenerateIV();


        string key = Encoding.ASCII.GetString(_rijndaelObj.Key);
        string iv = Encoding.ASCII.GetString(_rijndaelObj.IV);
        return new AesData(key, iv);
    }