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C#加密算法汇总

2010-01-30 11:35  曾祥展  阅读(33200)  评论(11编辑  收藏
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); 
	    return sr.ReadToEnd(); 
	} 
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(); 

}

 

using System;
using System.Security.Cryptography;//这个是处理文字编码的前提
using System.Text;
using System.IO;
/// <summary>
/// DES加密方法
/// </summary>
/// <param name="strPlain">明文</param>
/// <param name="strDESKey">密钥</param>
/// <param name="strDESIV">向量</param>
/// <returns>密文</returns>
public string DESEncrypt(string strPlain,string strDESKey,string strDESIV)
{
 //把密钥转换成字节数组
 byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);
 //把向量转换成字节数组
 byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);
 //声明1个新的DES对象
 DESCryptoServiceProvider desEncrypt=new DESCryptoServiceProvider();
 //开辟一块内存流
 MemoryStream msEncrypt=new MemoryStream();
 //把内存流对象包装成加密流对象
 CryptoStream csEncrypt=new CryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write);
 //把加密流对象包装成写入流对象
 StreamWriter swEncrypt=new StreamWriter(csEncrypt);
 //写入流对象写入明文
 swEncrypt.WriteLine(strPlain);
 //写入流关闭
 swEncrypt.Close();
 //加密流关闭
 csEncrypt.Close();
 //把内存流转换成字节数组,内存流现在已经是密文了
 byte[] bytesCipher=msEncrypt.ToArray();
 //内存流关闭
 msEncrypt.Close();
 //把密文字节数组转换为字符串,并返回
 return UnicodeEncoding.Unicode.GetString(bytesCipher);
}




/// <summary>
/// DES解密方法
/// </summary>
/// <param name="strCipher">密文</param>
/// <param name="strDESKey">密钥</param>
/// <param name="strDESIV">向量</param>
/// <returns>明文</returns>
public string DESDecrypt(string strCipher,string strDESKey,string strDESIV)
{
 //把密钥转换成字节数组
 byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);
 //把向量转换成字节数组
 byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);
 //把密文转换成字节数组
 byte[] bytesCipher=UnicodeEncoding.Unicode.GetBytes(strCipher);
 //声明1个新的DES对象
 DESCryptoServiceProvider desDecrypt=new DESCryptoServiceProvider();
 //开辟一块内存流,并存放密文字节数组
 MemoryStream msDecrypt=new MemoryStream(bytesCipher);
 //把内存流对象包装成解密流对象
 CryptoStream csDecrypt=new CryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read);
 //把解密流对象包装成读出流对象
 StreamReader srDecrypt=new StreamReader(csDecrypt);
 //明文=读出流的读出内容
 string strPlainText=srDecrypt.ReadLine();
 //读出流关闭
 srDecrypt.Close();
 //解密流关闭
 csDecrypt.Close();
 //内存流关闭
 msDecrypt.Close();
 //返回明文
 return strPlainText;
}