C#常用数据加密类

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Cryptography
{
public static class EncryptComputer
{

#region DES加密速度較快，適用於加密大量數據的場合
/// <summary>
/// DES加密速度較快，適用於加密大量數據的場合
/// </summary>
/// <param name="EncryptString">待加密的密文</param>
/// <param name="EncryptKey">加密的密鑰</param>
/// <returns>returns</returns>

public static string DESEncrypt(string EncryptString, string EncryptKey)
{

if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }

if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }

if (EncryptKey.Length != 8) { throw (new Exception("密钥必须为8位")); }

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

string m_strEncrypt = "";

DESCryptoServiceProvider m_DESProvider = new DESCryptoServiceProvider();

try
{

byte[] m_btEncryptString = Encoding.Default.GetBytes(EncryptString);

MemoryStream m_stream = new MemoryStream();

CryptoStream m_cstream = new CryptoStream(m_stream, m_DESProvider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);

m_cstream.Write(m_btEncryptString, 0, m_btEncryptString.Length);

m_cstream.FlushFinalBlock();

m_strEncrypt = Convert.ToBase64String(m_stream.ToArray());

m_stream.Close(); m_stream.Dispose();

m_cstream.Close(); m_cstream.Dispose();

}

catch (IOException ex) { throw ex; }

catch (CryptographicException ex) { throw ex; }

catch (ArgumentException ex) { throw ex; }

catch (Exception ex) { throw ex; }

finally { m_DESProvider.Clear(); }

return m_strEncrypt;

}
#endregion

#region DES 解密(数据加密标准，速度较快，适用于加密大量数据的场合)
/// <summary>

/// DES 解密(加密速度較快，適用於加密大量數據的場合)

/// </summary>

/// <param name="DecryptString">待解密的密文</param>

/// <param name="DecryptKey">解密的密鑰</param>

/// <returns>returns</returns>

public static string DESDecrypt(string DecryptString, string DecryptKey)
{

if (string.IsNullOrEmpty(DecryptString)) { throw (new Exception("密鑰不得為空")); }

if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密鑰不得為空")); }

if (DecryptKey.Length != 8) { throw (new Exception("密鑰必須為8位")); }

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

string m_strDecrypt = "";

DESCryptoServiceProvider m_DESProvider = new DESCryptoServiceProvider();

try
{

byte[] m_btDecryptString = Convert.FromBase64String(DecryptString);

MemoryStream m_stream = new MemoryStream();

CryptoStream m_cstream = new CryptoStream(m_stream, m_DESProvider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);

m_cstream.Write(m_btDecryptString, 0, m_btDecryptString.Length);

m_cstream.FlushFinalBlock();

m_strDecrypt = Encoding.Default.GetString(m_stream.ToArray());

m_stream.Close(); m_stream.Dispose();

m_cstream.Close(); m_cstream.Dispose();

}

catch (IOException ex) { throw ex; }

catch (CryptographicException ex) { throw ex; }

catch (ArgumentException ex) { throw ex; }

catch (Exception ex) { throw ex; }

finally { m_DESProvider.Clear(); }

return m_strDecrypt;

}
#endregion

#region RC2 加密(用变长密钥对大量数据进行加密)
/// <summary>

/// RC2 加密(用变长密钥对大量数据进行加密)

/// </summary>

/// <param name="EncryptString">待加密密文</param>

/// <param name="EncryptKey">加密密钥</param>

/// <returns>returns</returns>

public static string RC2Encrypt(string EncryptString, string EncryptKey)
{

if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }

if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }

if (EncryptKey.Length < 5 || EncryptKey.Length > 16) { throw (new Exception("密钥必须为5-16位")); }

string m_strEncrypt = "";

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

RC2CryptoServiceProvider m_RC2Provider = new RC2CryptoServiceProvider();

try
{

byte[] m_btEncryptString = Encoding.Default.GetBytes(EncryptString);

MemoryStream m_stream = new MemoryStream();

CryptoStream m_cstream = new CryptoStream(m_stream, m_RC2Provider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);

m_cstream.Write(m_btEncryptString, 0, m_btEncryptString.Length);

m_cstream.FlushFinalBlock();

m_strEncrypt = Convert.ToBase64String(m_stream.ToArray());

m_stream.Close(); m_stream.Dispose();

m_cstream.Close(); m_cstream.Dispose();

}

catch (IOException ex) { throw ex; }

catch (CryptographicException ex) { throw ex; }

catch (ArgumentException ex) { throw ex; }

catch (Exception ex) { throw ex; }

finally { m_RC2Provider.Clear(); }

return m_strEncrypt;

}
#endregion

#region RC2 解密(用变长密钥对大量数据进行加密)
/// <summary>

/// RC2 解密(用变长密钥对大量数据进行加密)

/// </summary>

/// <param name="DecryptString">待解密密文</param>

/// <param name="DecryptKey">解密密钥</param>

/// <returns>returns</returns>

public static string RC2Decrypt(string DecryptString, string DecryptKey)
{

if (string.IsNullOrEmpty(DecryptString)) { throw (new Exception("密文不得为空")); }

if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密钥不得为空")); }

if (DecryptKey.Length < 5 || DecryptKey.Length > 16) { throw (new Exception("密钥必须为5-16位")); }

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

string m_strDecrypt = "";

RC2CryptoServiceProvider m_RC2Provider = new RC2CryptoServiceProvider();

try
{

byte[] m_btDecryptString = Convert.FromBase64String(DecryptString);

MemoryStream m_stream = new MemoryStream();

CryptoStream m_cstream = new CryptoStream(m_stream, m_RC2Provider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);

m_cstream.Write(m_btDecryptString, 0, m_btDecryptString.Length);

m_cstream.FlushFinalBlock();

m_strDecrypt = Encoding.Default.GetString(m_stream.ToArray());

m_stream.Close(); m_stream.Dispose();

m_cstream.Close(); m_cstream.Dispose();

}

catch (IOException ex) { throw ex; }

catch (CryptographicException ex) { throw ex; }

catch (ArgumentException ex) { throw ex; }

catch (Exception ex) { throw ex; }

finally { m_RC2Provider.Clear(); }

return m_strDecrypt;

}
#endregion

#region 3DES加密基於DES，對一塊數據用三個不同的秘鑰進行三次加密，強度更高些
/// <summary>

/// 3DES加密基於DES，對一塊數據用三個不同的密鑰進行三次加密，強度更高些

/// </summary>

/// <param name="EncryptString">待加密密文</param>

/// <param name="EncryptKey1">密鑰一</param>

/// <param name="EncryptKey2">密鑰二</param>

/// <param name="EncryptKey3">密鑰三</param>

/// <returns>returns</returns>

public static string DES3Encrypt(string EncryptString, string EncryptKey1, string EncryptKey2, string EncryptKey3)
{

string m_strEncrypt = "";

try
{

m_strEncrypt = DESEncrypt(EncryptString, EncryptKey3);

m_strEncrypt = DESEncrypt(m_strEncrypt, EncryptKey2);

m_strEncrypt = DESEncrypt(m_strEncrypt, EncryptKey1);

}

catch (Exception ex) { throw ex; }

return m_strEncrypt;

}
#endregion

#region 3DES 解密(3DES加密基於DES，對一塊數據用三個不同的密鑰進行三次加密，強度更高些)
/// <summary>

/// 3DES 解密(3DES加密基於DES，對一塊數據用三個不同的密鑰進行三次加密，強度更高些)

/// </summary>

/// <param name="DecryptString">待解密密文</param>

/// <param name="DecryptKey1">密钥一</param>

/// <param name="DecryptKey2">密钥二</param>

/// <param name="DecryptKey3">密钥三</param>

/// <returns>returns</returns>

public static string DES3Decrypt(string DecryptString, string DecryptKey1, string DecryptKey2, string DecryptKey3)
{

string m_strDecrypt = "";

try
{

m_strDecrypt = DESDecrypt(DecryptString, DecryptKey1);

m_strDecrypt = DESDecrypt(m_strDecrypt, DecryptKey2);

m_strDecrypt = DESDecrypt(m_strDecrypt, DecryptKey3);

}

catch (Exception ex) { throw ex; }

return m_strDecrypt;

}
#endregion

#region AES 加密為高級加密標準，是下一代加密算法的標準，速度快，安全級別高
/// <summary>

/// AES 加密為高級加密標準，是下一代加密算法的標準，速度快，安全級別高

/// </summary>

/// <param name="EncryptString">待加密密文</param>

/// <param name="EncryptKey">加密密鑰</param>

/// <returns></returns>

public static string AESEncrypt(string EncryptString, string EncryptKey)
{

if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }

if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }

string m_strEncrypt = "";

byte[] m_btIV = Convert.FromBase64String("Rkb4jvUy/ye7Cd7k89QQgQ==");

Rijndael m_AESProvider = Rijndael.Create();

try
{

byte[] m_btEncryptString = Encoding.Default.GetBytes(EncryptString);

MemoryStream m_stream = new MemoryStream();

CryptoStream m_csstream = new CryptoStream(m_stream, m_AESProvider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);

m_csstream.Write(m_btEncryptString, 0, m_btEncryptString.Length); m_csstream.FlushFinalBlock();

m_strEncrypt = Convert.ToBase64String(m_stream.ToArray());

m_stream.Close(); m_stream.Dispose();

m_csstream.Close(); m_csstream.Dispose();

}

catch (IOException ex) { throw ex; }

catch (CryptographicException ex) { throw ex; }

catch (ArgumentException ex) { throw ex; }

catch (Exception ex) { throw ex; }

finally { m_AESProvider.Clear(); }

return m_strEncrypt;

}
#endregion

#region AES 加密為高級加密標準，是下一代加密算法的標準，速度快，安全級別高
/// <summary>

/// AES 加密為高級加密標準，是下一代加密算法的標準，速度快，安全級別高

/// </summary>

/// <param name="DecryptString">待解密密文</param>

/// <param name="DecryptKey">解密密鑰</param>

/// <returns></returns>

public static string AESDecrypt(string DecryptString, string DecryptKey)
{

if (string.IsNullOrEmpty(DecryptString)) { throw (new Exception("密文不得为空")); }

if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密钥不得为空")); }

string m_strDecrypt = "";

byte[] m_btIV = Convert.FromBase64String("Rkb4jvUy/ye7Cd7k89QQgQ==");

Rijndael m_AESProvider = Rijndael.Create();

try
{

byte[] m_btDecryptString = Convert.FromBase64String(DecryptString);

MemoryStream m_stream = new MemoryStream();

CryptoStream m_csstream = new CryptoStream(m_stream, m_AESProvider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);

m_csstream.Write(m_btDecryptString, 0, m_btDecryptString.Length); m_csstream.FlushFinalBlock();

m_strDecrypt = Encoding.Default.GetString(m_stream.ToArray());

m_stream.Close(); m_stream.Dispose();

m_csstream.Close(); m_csstream.Dispose();

}

catch (IOException ex) { throw ex; }

catch (CryptographicException ex) { throw ex; }

catch (ArgumentException ex) { throw ex; }

catch (Exception ex) { throw ex; }

finally { m_AESProvider.Clear(); }

return m_strDecrypt;

}
#endregion

}
}