详述Asp.net的加密解密技巧(2)

下面本就简单介绍在项目中常用的加密及解密的方法

一、MD5加密算法

[.NET类库中自带的算法 MD5是个不可逆的算法 没有解密的算法]

其实在ASP.Net编程中加密数据。在DotNet中有自带的类：

System.Web.Security.HashPasswordForStoringInConfigFile()
public string md5(string str,int code)
{
if(code==16) //16位MD5加密（取32位加密的9~25字符）
{
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str,"MD5")
.ToLower().Substring(8,16) ;
}
if(code==32) //32位加密
{
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str,"MD5")
.ToLower();
}
return "00000000000000000000000000000000";
}

简单的使用:

//--导入所需要的包
using System.IO;
using System.Text;
using System.Security.Cryptography;

(1)MD5普通加密

//获取要加密的字段，并转化为Byte[]数组
byte[] data = System.Text.Encoding.Unicode
.GetBytes(TextBox1.Text.ToCharArray());
//建立加密服务
System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
//加密Byte[]数组
byte[] result = md5.ComputeHash(data);
Label1.Text = "MD5普通加密：" + System.Text.Encoding.Unicode.GetString(result);

(2)MD5密码加密[常用]

Label1.Text = "MD5密码加密：" + System.Web.Security.FormsAuthentication
.HashPasswordForStoringInConfigFile(TextBox1.Text, "MD5");

(3)ASP.NET中加密与解密QueryString的方法[常用]

//加密
Response.Redirect("DetailInfo.aspx?id=" + Convert.ToBase64String
(System.Text.Encoding.Default.GetBytes("whaben")).Replace("+","%2B"));
//解密
string ID = System.Text.Encoding.Default.GetString
(Convert.FromBase64String(Request.QueryString["id"].ToString().Replace("%2B","+")));

二、DES加密及解密的算法[常用密钥算法]

简单的使用:

//--导入所需要的包
using System.IO;
using System.Text;
using System.Security.Cryptography;
public static string Key = "DKMAB5DE";//加密密钥必须为8位
//加密算法
public static string MD5Encrypt(string pToEncrypt)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(Key);
des.IV = ASCIIEncoding.ASCII.GetBytes(Key);
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();
}
//解密算法
public static string MD5Decrypt(string pToDecrypt)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
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 = ASCIIEncoding.ASCII.GetBytes(Key);
des.IV = ASCIIEncoding.ASCII.GetBytes(Key);
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.ASCII.GetString(ms.ToArray());
}

三、RSA加密及解密的算法[常用密钥算法]

简单的使用:

//--导入所需要的包
using System.Text;
using System.Security.Cryptography;
//加密算法
public string RSAEncrypt(string encryptString)
{
CspParameters csp = new CspParameters();
csp.KeyContainerName = "whaben";
RSACryptoServiceProvider RSAProvider = new RSACryptoServiceProvider(csp);
byte[] encryptBytes = RSAProvider.Encrypt(ASCIIEncoding.ASCII.GetBytes(encryptString), true);
string str = "";
foreach (byte b in encryptBytes)
{
str = str + string.Format("{0:x2}", b);
}
return str;
}
//解密算法
public string RSADecrypt(string decryptString)
{
CspParameters csp = new CspParameters();
csp.KeyContainerName = "whaben";
RSACryptoServiceProvider RSAProvider = new RSACryptoServiceProvider(csp);
int length = (decryptString.Length / 2);
byte[] decryptBytes = new byte[length];
for (int index = 0; index < length; index++)
{
string substring = decryptString.Substring(index * 2, 2);
decryptBytes[index] = Convert.ToByte(substring, 16);
}
decryptBytes = RSAProvider.Decrypt(decryptBytes, true);
return ASCIIEncoding.ASCII.GetString(decryptBytes);
}