常用的字符串加密，解密方法封装代码,CSharp代码库,德仔网

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【CSharp】常用的字符串加密，解密方法封装
作者:liangjw0504 / 发布于2013/9/10/ 830

	//方法一
	//须添加对System.Web的引用
	//using System.Web.Security;
	/// <summary>
	/// SHA1加密字符串
	/// </summary>
	/// <param name="source">源字符串</param>
	/// <returns>加密后的字符串</returns>
	public string SHA1(string source)
	{
	 return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1");
	}
	/// <summary>
	/// MD5加密字符串
	/// </summary>
	/// <param name="source">源字符串</param>
	/// <returns>加密后的字符串</returns>
	public string MD5(string source)
	{
	 return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");;
	}

	
	//方法二(可逆加密解密)：
	//using System.Security.Cryptography;
	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);


	//方法三(MD5不可逆)：
	//using System.Security.Cryptography;
	//MD5不可逆加密
	//32位加密
	public string GetMD5_32(string s, string _input_charset)
	{
	 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 GetMd5_16(string ConvertString)
	{
	 MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
	 string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
	 t2 = t2.Replace("-", "");
	 return t2;
	}

	
	//方法四(对称加密)：
	//using System.IO;
	//using System.Security.Cryptography;
	private SymmetricAlgorithm mobjCryptoService;
	private string Key;
	/// <summary>
	/// 对称加密类的构造函数
	/// </summary>
	public SymmetricMethod()
	{
	 mobjCryptoService = new RijndaelManaged();
	 Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";
	}
	/// <summary>
	/// 获得密钥
	/// </summary>
	/// <returns>密钥</returns>
	private byte[] GetLegalKey()
	{
	 string sTemp = Key;
	 mobjCryptoService.GenerateKey();
	 byte[] bytTemp = mobjCryptoService.Key;
	 int KeyLength = bytTemp.Length;
	 if (sTemp.Length > KeyLength)
	 sTemp = sTemp.Substring(0, KeyLength);
	 else if (sTemp.Length < KeyLength)
	 sTemp = sTemp.PadRight(KeyLength, ' ');
	 return ASCIIEncoding.ASCII.GetBytes(sTemp);
	}
	/// <summary>
	/// 获得初始向量IV
	/// </summary>
	/// <returns>初试向量IV</returns>
	private byte[] GetLegalIV()
	{
	 string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";
	 mobjCryptoService.GenerateIV();
	 byte[] bytTemp = mobjCryptoService.IV;
	 int IVLength = bytTemp.Length;
	 if (sTemp.Length > IVLength)
	 sTemp = sTemp.Substring(0, IVLength);
	 else if (sTemp.Length < IVLength)
	 sTemp = sTemp.PadRight(IVLength, ' ');
	 return ASCIIEncoding.ASCII.GetBytes(sTemp);
	}
	/// <summary>
	/// 加密方法
	/// </summary>
	/// <param name="Source">待加密的串</param>
	/// <returns>经过加密的串</returns>
	public string Encrypto(string Source)
	{
	 byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
	 MemoryStream ms = new MemoryStream();
	 mobjCryptoService.Key = GetLegalKey();
	 mobjCryptoService.IV = GetLegalIV();
	 ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
	 CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
	 cs.Write(bytIn, 0, bytIn.Length);
	 cs.FlushFinalBlock();
	 ms.Close();
	 byte[] bytOut = ms.ToArray();
	 return Convert.ToBase64String(bytOut);
	}
	/// <summary>
	/// 解密方法
	/// </summary>
	/// <param name="Source">待解密的串</param>
	/// <returns>经过解密的串</returns>
	public string Decrypto(string Source)
	{
	 byte[] bytIn = Convert.FromBase64String(Source);
	 MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
	 mobjCryptoService.Key = GetLegalKey();
	 mobjCryptoService.IV = GetLegalIV();
	 ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
	 CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
	 StreamReader sr = new StreamReader(cs);
	 return sr.ReadToEnd();
	}

	//方法五：
	//using System.IO;
	//using System.Security.Cryptography;
	//using System.Text;
	//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;
	 }
	}

	
	//方法六(文件加密)：
	//using System.IO;
	//using System.Security.Cryptography;
	//using System.Text;
	//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();
	 return sr.ReadToEnd();
	}
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