问题
The code can be found at: http://pastebin.com/3Yg5bHra
My problem is, that when I decrypt then nothing gets returned at all. Nothing gets decrypted.
It goes wrong somewhere around line 111-114. The cryptoStream (csDecrypt) is empty, eventhough I put data into the memorystream (msDecrypt)
EDIT Nudier came up with a solution
回答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));
回答2:
Remember to set the key for Encryption and Decryption and also de IV(Initialization Vector)
回答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);
}
来源:https://stackoverflow.com/questions/9980884/rijndaelmanaged-can-not-decrypt