asp.net 的加密Encode和解密Decode.

asp.net 的加密和解密(c#)：

1. 导入所需包：

using System.IO;

using System.Text;

using System.Security.Cryptography;

2.加密

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(str.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);

response.write( "MD5普通加密：" + System.Text.Encoding.Unicode.GetString(result));

2)MD5密码加密[常用]

response.write("MD5密码加密：" + System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "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(str)).Replace("+","%2B"));

//解密

string ID = System.Text.Encoding.Default.GetString(Convert.FromBase64String(Request.QueryString["id"].ToString().Replace("%2B","+")));

加密和解密函数：

    Protected Function Encode(ByVal theStr As String) As String

        Return Convert.ToBase64String(System.Text.Encoding.Default.GetBytes(theStr)).Replace("+", "%2B")
    End Function
    Protected Function Decode(ByVal theStr As String) As String
        Return System.Text.Encoding.Default.GetString(Convert.FromBase64String(theStr.Replace("%2B", "+")))
    End Function

4）DES加密及解密的算法[常用密钥算法]

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());

}

5）RSA加密及解密的算法[常用密钥算法]

//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);

}

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