.Net加密与解密
正文:
1.MD5加密实现方式一:
/// <summary>
/// 获取MD5密码
/// </summary>
/// <returns></returns>
public static string GetMd5(string pwd)
{
string md5Pwd = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(pwd, "md5");
return md5Pwd;
}
2.MD5加密实现方式二:
/// <summary>
/// 使用自带的类进行MD5加密
/// </summary>
/// <param name="pwd"></param>
/// <returns></returns>
public static string GetMd5(string pwd)
{
MD5 md5 = MD5.Create(); //创建用于MD5加密的MD5对象
byte[] ms=Encoding.Default.GetBytes(pwd);
byte[] newms=md5.ComputeHash(ms);//对根据用户密码生成的byte类型的数据进行hash散列算法，返回了一个新的byte数组
StringBuilder sb = new StringBuilder();
foreach (byte item in newms)
{
//x:小写的16进制数 X：大写的16进制数 后面的数值是指转换后的16进制的位数
sb.Append(item.ToString("X2"));
}
return sb.ToString();
}
Note:只有加密没有解密,单向的;
3.DES加密
/// <summary>
/// 加密数据
/// </summary>
/// <param name="Text">加密数据</param>
/// <param name="sKey">根据key加密</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();
}
4.DES解密:
/// <summary>
/// 解密数据
/// </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());
}
5. 3des加密
/// <summary>
/// 3des加密字符串
/// </summary>
/// <param name="text">要加密的字符串</param>
/// <param name="key">密钥</param>
/// <returns>加密后并经base64编码的字符串</returns>
/// <remarks>静态方法，采用默认ascii编码</remarks>
public static string Encrypt(string text, string key)
{
TripleDESCryptoServiceProvider DES = new
TripleDESCryptoServiceProvider();
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
//3des密匙
DES.Key = hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(key));
//模式为电子密码块模式
DES.Mode = CipherMode.ECB;
//创建Encryptor对象
ICryptoTransform DESEncrypt = DES.CreateEncryptor();
//将需要加密的字符串转化为字节数组
byte[] Buffer = ASCIIEncoding.UTF8.GetBytes(text);
//通过加密对象的TransformFinalBlock()进行加密
//转化为Base64字符串返回
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock
(Buffer, 0, Buffer.Length));
}//end method
6.3des解密
/// <summary>
/// 3des解密字符串
/// </summary>
/// <param name="text">要解密的字符串</param>
/// <param name="key">密钥</param>
/// <returns>解密后的字符串</returns>
/// <exception cref="">密钥错误</exception>
/// <remarks>静态方法，采用默认ascii编码</remarks>
public static string Decrypt(string text, string key)
{
TripleDESCryptoServiceProvider DES = new
TripleDESCryptoServiceProvider();
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
//密匙
DES.Key = hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(key));
//模式
DES.Mode = CipherMode.ECB;
//创建Encryptor对象
ICryptoTransform DESDecrypt = DES.CreateDecryptor();
string result = "";
try
{
//将加密后的字符串转化为byte数组
byte[] Buffer = Convert.FromBase64String(text);
//TransformFinalBlock()返回解密后的byte数组
//通过UTF8编码返回字符串
result = ASCIIEncoding.UTF8.GetString(DESDecrypt.TransformFinalBlock
(Buffer, 0, Buffer.Length));
}
catch (Exception e)
{
return text;
// throw (new Exception("Invalid Key or input string is not a valid base64 string", e));
}
return result;
}//end method
