1 、方法一 (不可逆加密)
public string EncryptPassword( string PasswordString, string PasswordFormat )
{
string encryptPassword = null ;
if (PasswordFormat = " SHA1 " ) {
encryptPassword = FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString
, " SHA1 " );
}
elseif (PasswordFormat = " MD5 " )
{ encryptPassword = FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString
, " MD5 " );
}
return encryptPassword ;
}
2 、方法二 (可逆加密)
public interface IBindesh
{
string encode( string str);
string decode( string str);
}
public class EncryptionDecryption : IBindesh
{
public string encode( string str)
{
string htext = "" ;
for ( int i = 0 ; i < str.Length; i ++ )
{
htext = htext + ( char ) (str[i] + 10 - 1 * 2 );
}
return htext;
}
public string decode( string str)
{
string dtext = "" ;
for ( int i = 0 ; i < str.Length; i ++ )
{
dtext = dtext + ( char ) (str[i] - 10 + 1 * 2 );
}
return dtext;
}
3 、方法三 (可逆加密)
const string KEY_64 = " VavicApp " ; // 注意了，是8个字符，64位
const string IV_64 = " VavicApp " ;
public string Encode( string data)
{
byte [] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte [] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
int i = cryptoProvider.KeySize;
MemoryStream ms = new MemoryStream();
CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey,
byIV), CryptoStreamMode.Write);
StreamWriter sw = new StreamWriter(cst);
sw.Write(data);
sw.Flush();
cst.FlushFinalBlock();
sw.Flush();
return Convert.ToBase64String(ms.GetBuffer(), 0 , ( int )ms.Length);
}
public string Decode( string data)
{
byte [] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte [] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
byte [] byEnc;
try
{
byEnc = Convert.FromBase64String(data);
}
catch
{
return null ;
}
DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
MemoryStream ms = new MemoryStream(byEnc);
CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey,
byIV), CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cst);
return sr.ReadToEnd();
}
4 、MD5不可逆加密
(32位加密)
public string GetMD5( string s, string _input_charset)
{
/**/ /**/ /**/ /// <summary>
/// 与ASP兼容的MD5加密算法
/// </summary>
MD5 md5 = new MD5CryptoServiceProvider();
byte [] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
StringBuilder sb = new StringBuilder( 32 );
for ( int i = 0 ; i < t.Length; i ++ )
{
sb.Append(t[i].ToString( " x " ).PadLeft( 2 , ＇ 0 ＇));
}
return sb.ToString();
}
(16位加密)
public static string GetMd5Str( string ConvertString)
{
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
string t2 =
BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4 , 8 );
t2 = t2.Replace( " - " , "" );
return t2;
}
5 、加解文本文件
// 加密文件
private static void EncryptData(String inName, String outName, byte [] desKey, byte []
desIV)
{
// Create the file streams to handle the input and output files.
FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
fout.SetLength( 0 );
// Create variables to help with read and write.
byte [] bin = new byte [ 100 ]; // This is intermediate storage for the encryption.
long rdlen = 0 ; // This is the total number of bytes written.
long totlen = fin.Length; // This is the total length of the input file.
int len; // This is the number of bytes to be written at a time.
DES des = new DESCryptoServiceProvider();
CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV),
CryptoStreamMode.Write);
// Read from the input file, then encrypt and write to the output file.
while (rdlen < totlen)
{
len = fin.Read(bin, 0 , 100 );
encStream.Write(bin, 0 , len);
rdlen = rdlen + len;
}
encStream.Close();
fout.Close();
fin.Close();
}
// 解密文件
private static void DecryptData(String inName, String outName, byte [] desKey, byte []
desIV)
{
// Create the file streams to handle the input and output files.
FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
fout.SetLength( 0 );
// Create variables to help with read and write.
byte [] bin = new byte [ 100 ]; // This is intermediate storage for the encryption.
long rdlen = 0 ; // This is the total number of bytes written.
long totlen = fin.Length; // This is the total length of the input file.
int len; // This is the number of bytes to be written at a time.
DES des = new DESCryptoServiceProvider();
CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV),
CryptoStreamMode.Write);
// Read from the input file, then encrypt and write to the output file.
while (rdlen < totlen)
{
len = fin.Read(bin, 0 , 100 );
encStream.Write(bin, 0 , len);
rdlen = rdlen + len;
}
encStream.Close();
fout.Close();
fin.Close();
}
6 、
using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace Component
{
public class Security
{
public Security()
{
}
// 默认密钥向量
private static byte [] Keys = { 0x12 , 0x34 , 0x56 , 0x78 , 0x90 , 0xAB , 0xCD , 0xEF } ;
/**/ /**/ /**/ /**/ /**/ /**/ /**/ /// <summary>
/// DES加密字符串
/// </summary>
/// <param name="encryptString"> 待加密的字符串 </param>
/// <param name="encryptKey"> 加密密钥,要求为8位 </param>
/// <returns> 加密成功返回加密后的字符串，失败返回源串 </returns>
public static string EncryptDES( string encryptString, string encryptKey)
{
try
{
byte [] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring( 0 , 8 ));
byte [] rgbIV = Keys;
byte [] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey,
rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0 , inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
catch
{
return encryptString;
}
}
/**/ /**/ /**/ /**/ /**/ /**/ /**/ /// <summary>
/// DES解密字符串
/// </summary>
/// <param name="decryptString"> 待解密的字符串 </param>
/// <param name="decryptKey"> 解密密钥,要求为8位,和加密密钥相同 </param>
/// <returns> 解密成功返回解密后的字符串，失败返源串 </returns>
public static string DecryptDES( string decryptString, string decryptKey)
{
try
{
byte [] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte [] rgbIV = Keys;
byte [] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey,
rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0 , inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
}
}
}
}