我有一个文本框和一个解密＆＃39;我的Windows窗体应用程序中的按钮，我在其中放入一个加密的字符串并尝试解密它，但问题是这样。首先，我从这个网站上的一个人那里得到了这个名为DataEncryptor的类代码：
public class DataEncryptor
{
TripleDESCryptoServiceProvider symm;
#region Factory
public DataEncryptor()
{
this.symm = new TripleDESCryptoServiceProvider();
this.symm.Padding = PaddingMode.PKCS7;
}
public DataEncryptor(TripleDESCryptoServiceProvider keys)
{
this.symm = keys;
}
public DataEncryptor(byte[] key, byte[] iv)
{
this.symm = new TripleDESCryptoServiceProvider();
this.symm.Padding = PaddingMode.PKCS7;
this.symm.Key = key;
this.symm.IV = iv;
}
#endregion
#region Properties
public TripleDESCryptoServiceProvider Algorithm
{
get { return symm; }
set { symm = value; }
}
public byte[] Key
{
get { return symm.Key; }
set { symm.Key = value; }
}
public byte[] IV
{
get { return symm.IV; }
set { symm.IV = value; }
}
#endregion
#region Crypto
public byte[] Encrypt(byte[] data) { return Encrypt(data, data.Length); }
public byte[] Encrypt(byte[] data, int length)
{
try
{
// Create a MemoryStream.
var ms = new MemoryStream();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
var cs = new CryptoStream(ms,
symm.CreateEncryptor(symm.Key, symm.IV),
CryptoStreamMode.Write);
// Write the byte array to the crypto stream and flush it.
cs.Write(data, 0, length);
cs.FlushFinalBlock();
// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
byte[] ret = ms.ToArray();
// Close the streams.
cs.Close();
ms.Close();
// Return the encrypted buffer.
return ret;
}
catch (CryptographicException ex)
{
Console.WriteLine("A cryptographic error occured: {0}", ex.Message);
}
return null;
}
public string EncryptString(string text)
{
return Convert.ToBase64String(Encrypt(Encoding.UTF8.GetBytes(text)));
}
public byte[] Decrypt(byte[] data) { return Decrypt(data, data.Length); }
public byte[] Decrypt(byte[] data, int length)
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream ms = new MemoryStream(data);
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream cs = new CryptoStream(ms,
symm.CreateDecryptor(symm.Key, symm.IV),
CryptoStreamMode.Read);
// Create buffer to hold the decrypted data.
byte[] result = new byte[length];
// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
cs.Read(result, 0, result.Length);
return result;
}
catch (CryptographicException ex)
{
Console.WriteLine("A cryptographic error occured: {0}", ex.Message);
}
return null;
}
public string DecryptString(string data)
{
return Encoding.UTF8.GetString(Decrypt(Convert.FromBase64String(data))).TrimEnd('\0');
}
#endregion
}
他给出了它的用法：
string message="A very secret message here.";
DataEncryptor keys=new DataEncryptor();
string encr=keys.EncryptString(message);
// later
string actual=keys.DecryptString(encr);
我复制了他的代码并致力于加密和解密：
//my code
private void proceedED(string data)
{
DataEncryptor key = new DataEncryptor();
string encr = key.EncryptString(data);
string actual = key.DecryptString(encr);
encryptedLabel.Text = encr;
decryptedLabel.Text = actual;
}
然后我创建了一个这样的方法：
private void proceedDecrypt(string data)
{
DataEncryptor key = new DataEncryptor();
string decr = key.DecryptString(data);
decryptedData.Text = decr;
}
问题是，当我提交时它崩溃了，我不知道为什么。 我认为它应该是一个真正的加密字符串，因为它只是一个普通的字符串。 我该如何解决这个问题？
答案 0 :(得分：1)
DataEncryptor的每个实例都会生成新密钥。您需要使用加密字符串的相同密钥进行解密。如果在同一过程中完成此操作，请保留对DataEncryptor key的引用。否则，您需要使用DataEncryptor(byte[] key, byte[] iv)构造函数初始化。
尝试这样的代码：
class Program
{
static void Main(string[] args)
{
string key, iv;
var plain="A very secret message.";
var cipher=EncryptString(plain, out key, out iv);
// Later ...
var message=DecryptString(cipher, key, iv);
}
public static string EncryptString(string plain, out string key, out string iv)
{
var crypto=new DataEncryptor();
iv=Convert.ToBase64String(crypto.IV);
key=Convert.ToBase64String(crypto.Key);
return crypto.EncryptString(plain);
}
public static string DecryptString(string cipher, string key, string iv)
{
var crypto=new DataEncryptor(
Convert.FromBase64String(key),
Convert.FromBase64String(iv));
return crypto.DecryptString(cipher);
}
}
答案 1 :(得分：0)
你正在两个函数中创建新对象;
DataEncryptor key = new DataEncryptor();
这就是你的错误的原因。
请声明;
DataEncryptor key = new DataEncryptor();
您的proceedED（）和proceedDecrypt（）的外侧，我的意思是公开。
或者您可以将pass key作为参数传递给proceedDecrypt（）并在该函数中使用它。
像;
DataEncryptor key = new DataEncryptor();
private void proceedED(string data)
{
string encr = key.EncryptString(data);
string actual = key.DecryptString(encr);
encryptedLabel.Text = encr;
decryptedLabel.Text = actual;
proceedDecrypt(encr);
}
private void proceedDecrypt(string data)
{
string decr = key.DecryptString(data);
decryptedData.Text = decr;
}
希望它有所帮助...... !!!
答案 2 :(得分：0)
您可以在System.Security.Cryptography
中使用加密和解密1) Set encryption decription key
2) Encrypt data with encryption key
3) Decrypt data with same encryption key
请参阅以下链接，加密和描述示例。 Encryption/Decryption Function in .NET using the TripleDESCryptoServiceProvider Class
答案 3 :(得分：0)
好吧我终于解决了......
复制了此代码 static readonly string PasswordHash = "P@@Sw0rd";
static readonly string SaltKey = "S@LT&KEY";
static readonly string VIKey = "@1B2c3D4e5F6g7H8";
public static string Encrypt(string plainText)
{
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
byte[] keyBytes = new Rfc2898DeriveBytes(PasswordHash, Encoding.ASCII.GetBytes(SaltKey)).GetBytes(256 / 8);
var symmetricKey = new RijndaelManaged() { Mode = CipherMode.CBC, Padding = PaddingMode.Zeros };
var encryptor = symmetricKey.CreateEncryptor(keyBytes, Encoding.ASCII.GetBytes(VIKey));
byte[] cipherTextBytes;
using (var memoryStream = new MemoryStream())
{
using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
cipherTextBytes = memoryStream.ToArray();
cryptoStream.Close();
}
memoryStream.Close();
}
return Convert.ToBase64String(cipherTextBytes);
}
public static string Decrypt(string encryptedText)
{
byte[] cipherTextBytes = Convert.FromBase64String(encryptedText);
byte[] keyBytes = new Rfc2898DeriveBytes(PasswordHash, Encoding.ASCII.GetBytes(SaltKey)).GetBytes(256 / 8);
var symmetricKey = new RijndaelManaged() { Mode = CipherMode.CBC, Padding = PaddingMode.None };
var decryptor = symmetricKey.CreateDecryptor(keyBytes, Encoding.ASCII.GetBytes(VIKey));
var memoryStream = new MemoryStream(cipherTextBytes);
var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
byte[] plainTextBytes = new byte[cipherTextBytes.Length];
int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
memoryStream.Close();
cryptoStream.Close();
return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount).TrimEnd("\0".ToCharArray());
}
并删除了DataEncryptor类