原文檔密碼編譯演算法描述如下:
1.1 訊息安全性
Des加密保證訊息的不可閱讀性。
對訊息的密碼編譯演算法:Base64(DES(MD5(訊息體) + 訊息體))
訊息採用的DES密碼編譯演算法規則如下:
1.密鑰是一個長度16、由16進位字元組成的字串,如:1234567890ABCDEF
使用時,相臨的兩位理解為一個16進位數的明文,然後轉換為實際使用的8位密鑰
2. 待加密資料按照PKCS5規則進行補位。(缺7位補7個0x07,缺6位則補6個0x06,以次類推,如果正好8位,也需要補8個0x08)
3. 實際加密模式選擇DES-ECB
4. 經過DES加密後的資料必須通過Base64編碼轉換為明文的字串
華為提示java的jar包,但.net 方面是沒有方法,網上查詢了很多,des方法有很多,加密結果不一樣,經常仔細閱讀密碼編譯演算法,終於實現在,提供給大家
代碼
using System;
using System.Text;
using System.ComponentModel;
using System.Collections;
using System.Security;
using System.Security.Cryptography;
using System.Diagnostics;
using System.IO;
namespace AdcLib.Util
{
/// <summary>
/// Class1 的摘要說明。
/// </summary>
public class SecurityUtil //加密解密類
{
/// <summary>
/// 3des加密字串
/// </summary>
/// <param name= "a_strString "> 要加密的字串 </param>
/// <param name= "a_strKey "> 密鑰 </param>
/// <returns> 加密後並經base64編碼的字串 </returns>
/// <remarks> 靜態方法,採用預設ascii編碼 </remarks>
public static string EncryptDES(string a_strString, string a_strKey)
{
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
//TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
//MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
byte[] b = strToToHexByte(a_strKey);
DES.Key = b;
// DES.IV = b;
// DES.Key = b;//ASCIIEncoding.ASCII.GetBytes(a_strKey);//hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(a_strKey));
DES.Mode = CipherMode.ECB;
DES.Padding = PaddingMode.PKCS7;
ICryptoTransform DESEncrypt = DES.CreateEncryptor();
byte[] Buffer = ASCIIEncoding.UTF8.GetBytes(a_strString);
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
}//end method
private static byte[] strToToHexByte(string hexString)
{
byte[] returnBytes = new byte[hexString.Length / 2];
for (int i = 0; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2),16);
return returnBytes;
}
/// <summary>
/// 3des解密字串
/// </summary>
/// <param name= "a_strString "> 要解密的字串 </param>
/// <param name= "a_strKey "> 密鑰 </param>
/// <returns> 解密後的字串 </returns>
/// <exception cref= " "> 密鑰錯誤 </exception>
/// <remarks> 靜態方法,採用預設ascii編碼 </remarks>
public static string DecryptDES(string a_strString, string a_strKey)
{
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = strToToHexByte(a_strKey);
DES.Mode = CipherMode.ECB;
DES.Padding = PaddingMode.PKCS7;
ICryptoTransform DESDecrypt = DES.CreateDecryptor();
string result = " ";
try
{
byte[] Buffer = Convert.FromBase64String(a_strString);
result = ASCIIEncoding.UTF8.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
}
catch (Exception e)
{
throw (new Exception("Invalid Key or input string is not a valid base64 string ", e));
}
return result;
}//end method
/// <summary>
/// MD5
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static string MD5(string data)
{
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
return BitConverter.ToString(md5.ComputeHash(Encoding.UTF8.GetBytes(data))).Replace("-", "").ToLower();
}
}
}