加密方法

// To add a reference to the system.Web  

using System.Web.Security;

...

/// <summary>

/// SHA1 The encrypted string  

/// </summary>

/// <param name="source"> The source string  </param>

/// <returns> The encrypted string  </returns>

public string SHA1(string source)

{

    return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1");

}

/// <summary>

/// MD5 The encrypted string  

/// </summary>

/// <param name="source"> The source string  </param>

/// <returns> The encrypted string  </returns>

public string MD5(string source)

{

    return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");;

}

 Method two  ( Reversible encryption and decryption  ):

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();

}

 Method 3  (MD5 Irreversible  ):

using System.Security.Cryptography;

//MD5 Non-reversible encryption  

//32 Bit encryption  

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 Bit encryption  

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;

}

 Method four  ( Symmetric encryption  ):

using System.IO;

using System.Security.Cryptography;

private SymmetricAlgorithm mobjCryptoService;

private string Key;

/// <summary>
///  Symmetric encryption class constructor
/// </summary>
public SymmetricMethod()

{

    mobjCryptoService = new RijndaelManaged();

    Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";

}

/// <summary>
///  Get key
/// </summary>
/// <returns> Key  </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>
///  Get initial vector  IV
/// </summary>
/// <returns> The initial vector  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>
///  The encryption method
/// </summary>
/// <param name="Source"> The string to be encrypted  </param>
/// <returns> The encrypted string  </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>
///  Decrypt method
/// </summary>
/// <param name="Source"> To decrypt a string  </param>
/// <returns> Decrypted string  </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();

}

 Method 5  :

using System.IO;

using System.Security.Cryptography;

using System.Text;

...

// The default key vector  

private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

/// <summary>

/// DES The encrypted string  

/// </summary>

/// <param name="encryptString"> A string to be encrypted  </param>

/// <param name="encryptKey"> The encryption key, requirements for  8 Bit  </param>

/// <returns> Encryption successfully return the encrypted string, failed to return to the source string  </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 Decrypt strings  

/// </summary>

/// <param name="decryptString"> To decrypt a string  </param>

/// <param name="decryptKey"> The decryption key, requirements for  8 Bit, and the same encryption key  </param>

/// <returns> Decrypt successfully returns the decrypted string, failure to source string  </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;

    }

} 

 Method 6  ( File encryption  ):

using System.IO;

using System.Security.Cryptography;

using System.Text;

// Encrypted files  

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();

}

// To decrypt the file  

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();

}