【发布时间】:2015-06-12 16:25:49
【问题描述】:
我在我的 Windows 窗体应用程序中有一个文本框和一个“解密”按钮,我在其中放置了一个加密字符串并尝试对其进行解密,但问题是这样的。首先,我从这个网站上的一个人那里得到了这个名为 DataEncryptor 的课程代码:
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从事加密和解密工作:
//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?
【问题讨论】:
-
它给出了什么例外?在所有关于“错误”、“崩溃”等的帖子中都包含异常的消息和堆栈跟踪?也许,您还没有初始化密钥或者您的
data有问题。如果没有异常消息,我们无法知道它。 -
Array cannot be null Paramater name: bytes行错误在 DataEncryptor 类底部的 DecryptString(string data) 方法中 -
看起来您创建了方法
proceedDecrypt,但将空的data传递给它。看你调用这个方法的地方。 -
我认为它需要是一个真正的加密字符串,因为它只是一个普通的字符串
-
嗯,这段代码对我来说很熟悉。见stackoverflow.com/a/10176980/380384
标签: c# encryption