轉載C#加密方法

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方法一：
    //須添加對System.Web的引用
    using System.Web.Security;
     
    ...
     
    /// <summary>
    /// SHA1加密字串
    /// </summary>
    /// <param name="source">源字串</param>
    /// <returns>加密後的字串</returns>
    public string SHA1(string source)
    {
        return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1");
    }
 
 
    /// <summary>
    /// MD5加密字串
    /// </summary>
    /// <param name="source">源字串</param>
    /// <returns>加密後的字串</returns>
    public string MD5(string source)
    {
        return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");;
    }

 

方法五：
    using System.IO;
    using System.Security.Cryptography;
    using System.Text;
     
    ...
     
    //預設密鑰向量
    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
    /// <summary>
    /// DES加密字串
    /// </summary>
    /// <param name="encryptString">待加密的字串</param>
    /// <param name="encryptKey">加密金鑰,要求為8位</param>
    /// <returns>加密成功返回加密後的字串，失敗返回源串</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解密字串
    /// </summary>
    /// <param name="decryptString">待解密的字串</param>
    /// <param name="decryptKey">解密密鑰,要求為8位,和加密金鑰相同</param>
    /// <returns>解密成功返回解密後的字串，失敗返源串</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(檔案加密)：
    using System.IO;
    using System.Security.Cryptography;
    using System.Text;
     
    ...
     
    //加密檔案
    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();
    }
     
    //解密檔案
    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();
 
}

 

原文地址：http://www.cnblogs.com/zengxiangzhan/archive/2010/01/30/1659687.html

轉載C#加密方法