Question

关于用C#实现加密与解密文件的疑问，请问在哪里提示了由用户自己输入密码？

static string GenerateKey()
{

DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();

return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
}

Answer 1

该类不是你这种使用方法，建议参考下列的使用方法，msdn上更详细。
public string Encrypt(string stringToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(stringToEncrypt);
des.Key = ASCIIEncoding.UTF8.GetBytes(sKey);
des.IV = ASCIIEncoding.UTF8.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}

public string Decrypt(string stringToDecrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = new byte[stringToDecrypt.Length / 2];
for (int x = 0; x < stringToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(stringToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}

des.Key = ASCIIEncoding.UTF8.GetBytes(sKey);
des.IV = ASCIIEncoding.UTF8.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder();

return System.Text.Encoding.Default.GetString(ms.ToArray());
}

追问

谢谢，我参考了您的代码，已经写出来了，只是，我发现使用了[DllImport("kernel32.dll")]，调用了ZeroMemory函数，程序执行的非常慢，请问有没有办法解决？

Answer 2

挖，，，，，高手挖 ，，，，，，，，