ASP.NET----DES暗号化/復号化クラス
7318 ワード
using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
/// <summary>
/// DES / 。
/// </summary>
public class DESEncrypt
{
public DESEncrypt()
{
}
#region ======== ========
/// <summary>
///
/// </summary>
/// <param name="Text"></param>
/// <returns></returns>
public static string Encrypt(string Text)
{
return Encrypt(Text, "HarryJames");
}
/// <summary>
///
/// </summary>
/// <param name="Text"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string Encrypt(string Text, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray;
inputByteArray = Encoding.Default.GetBytes(Text);
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
System.IO.MemoryStream ms = new System.IO.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);
}
return ret.ToString();
}
#endregion
#region ======== ========
/// <summary>
///
/// </summary>
/// <param name="Text"></param>
/// <returns></returns>
public static string Decrypt(string Text)
{
return Decrypt(Text, "HarryJames");
}
/// <summary>
///
/// </summary>
/// <param name="Text"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string Decrypt(string Text, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
int len;
len = Text.Length / 2;
byte[] inputByteArray = new byte[len];
int x, i;
for (x = 0; x < len; x++)
{
i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
System.IO.MemoryStream ms = new System.IO.MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return Encoding.Default.GetString(ms.ToArray());
}
#endregion
}
public class DESEncryptEx
{
#region ======== ========
/// <summary>
///
/// </summary>
/// <param name="pToEncrypt"> </param>
/// <returns></returns>
public static string Encrypt(string pToEncrypt)
{
byte[] desKey = new byte[] { 0x16, 0x29, 0x98, 0x15, 0x07, 0x08, 0x05, 0x03 };
byte[] desIV = new byte[] { 0x16, 0x09, 0x14, 0x15, 0x07, 0x08, 0x05, 0x03 };
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
try
{
// byte
// UTF8 ， Unicode ，
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);
//
// ASCIIEncoding.ASCII GetBytes
//
des.Key = desKey; // ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = desIV; //ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
//Write the byte array into the crypto stream
//(It will end up in the memory stream)
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//Get the data back from the memory stream, and into a string
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
//Format as hex
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}
catch
{
return pToEncrypt;
}
finally
{
des = null;
}
}
#endregion
#region ======== ========
/// <summary>
///
/// </summary>
/// <param name="pToDecrypt"> </param>
/// <returns></returns>
public static string Decrypt(string pToDecrypt)
{
byte[] desKey = new byte[] { 0x16, 0x29, 0x98, 0x15, 0x07, 0x08, 0x05, 0x03 };
byte[] desIV = new byte[] { 0x16, 0x09, 0x14, 0x15, 0x07, 0x08, 0x05, 0x03 };
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
try
{
//Put the input string into the byte array
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
// ， ，
des.Key = desKey; //ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = desIV; //ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
//Flush the data through the crypto stream into the memory stream
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//Get the decrypted data back from the memory stream
// StringBuild ，CreateDecrypt ，
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
catch
{
return pToDecrypt;
}
finally
{
des = null;
}
}
#endregion
}
データベースに書き込むログイン時にpasswordを暗号化できます!データにパスワードを表示すると暗号化された文字になります!もちろんこのような解読機能も備えています!直接呼び出すだけでいい