C 常用資料加密類

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
if (string.isnullorempty(encryptkey)) 
if (encryptkey.length != 8) 
byte m_btiv = ;
string m_strencrypt = "";
descryptoserviceprovider m_desprovider = new descryptoserviceprovider();
trycatch (ioexception ex) 
catch (cryptographicexception ex) 
catch (argumentexception ex) 
catch (exception ex) 
finally 
return m_strencrypt;
} #endregion
#region des 解密(資料加密標準，速度較快，適用於加密大量資料的場合)
/// /// des 解密(加密速度較快，適用於加密大量資料的場合)
/// 
/// 待解密的密文
/// 解密的金鑰
/// returns
public static string desdecrypt(string decryptstring, string decryptkey)
if (string.isnullorempty(decryptkey)) 
if (decryptkey.length != 8) 
byte m_btiv = ;
string m_strdecrypt = "";
descryptoserviceprovider m_desprovider = new descryptoserviceprovider();
trycatch (ioexception ex) 
catch (cryptographicexception ex) 
catch (argumentexception ex) 
catch (exception ex) 
finally 
return m_strdecrypt;
} #endregion
#region rc2 加密(用變長金鑰對大量資料進行加密)
/// /// rc2 加密(用變長金鑰對大量資料進行加密)
/// 
/// 待加密密文
/// 加密金鑰
/// returns
public static string rc2encrypt(string encryptstring, string encryptkey)
if (string.isnullorempty(encryptkey)) 
if (encryptkey.length < 5 || encryptkey.length > 16) 
string m_strencrypt = "";
byte m_btiv = ;
rc2cryptoserviceprovider m_rc2provider = new rc2cryptoserviceprovider();
trycatch (ioexception ex) 
catch (cryptographicexception ex) 
catch (argumentexception ex) 
catch (exception ex) 
finally 
return m_strencrypt;
} #endregion
#region rc2 解密(用變長金鑰對大量資料進行加密)
/// /// rc2 解密(用變長金鑰對大量資料進行加密)
/// 
/// 待解密密文
/// 解密金鑰
/// returns
public static string rc2decrypt(string decryptstring, string decryptkey)
if (string.isnullorempty(decryptkey)) 
if (decryptkey.length < 5 || decryptkey.length > 16) 
byte m_btiv = ;
string m_strdecrypt = "";
rc2cryptoserviceprovider m_rc2provider = new rc2cryptoserviceprovider();
trycatch (ioexception ex) 
catch (cryptographicexception ex) 
catch (argumentexception ex) 
catch (exception ex) 
finally 
return m_strdecrypt;
} #endregion
#region 3des加密基於des，對一塊資料用三個不同的秘鑰進行三次加密，強度更高些
/// /// 3des加密基於des，對一塊資料用三個不同的金鑰進行三次加密，強度更高些
/// 
/// 待加密密文
/// 金鑰一
/// 金鑰二
/// 金鑰三
/// returns
public static string des3encrypt(string encryptstring, string encryptkey1, string encryptkey2, string encryptkey3)
catch (exception ex) 
return m_strencrypt;
} #endregion
#region 3des 解密(3des加密基於des，對一塊資料用三個不同的金鑰進行三次加密，強度更高些)
/// /// 3des 解密(3des加密基於des，對一塊資料用三個不同的金鑰進行三次加密，強度更高些)
/// 
/// 待解密密文
/// 金鑰一
/// 金鑰二
/// 金鑰三
/// returns
public static string des3decrypt(string decryptstring, string decryptkey1, string decryptkey2, string decryptkey3)
catch (exception ex) 
return m_strdecrypt;
} #endregion
#region aes 加密為高階加密標準，是下一代加密演算法的標準，速度快，安全級別高
/// /// aes 加密為高階加密標準，是下一代加密演算法的標準，速度快，安全級別高
/// 
/// 待加密密文
/// 加密金鑰
/// 
public static string aesencrypt(string encryptstring, string encryptkey)
if (string.isnullorempty(encryptkey)) 
string m_strencrypt = "";
byte m_btiv = convert.frombase64string("rkb4jvuy/ye7cd7k89qqgq==");
rijndael m_aesprovider = rijndael.create();
trycatch (ioexception ex) 
catch (cryptographicexception ex) 
catch (argumentexception ex) 
catch (exception ex) 
finally 
return m_strencrypt;
} #endregion
#region aes 加密為高階加密標準，是下一代加密演算法的標準，速度快，安全級別高
/// /// aes 加密為高階加密標準，是下一代加密演算法的標準，速度快，安全級別高
/// 
/// 待解密密文
/// 解密金鑰
/// 
public static string aesdecrypt(string decryptstring, string decryptkey)
if (string.isnullorempty(decryptkey)) 
string m_strdecrypt = "";
byte m_btiv = convert.frombase64string("rkb4jvuy/ye7cd7k89qqgq==");
rijndael m_aesprovider = rijndael.create();
trycatch (ioexception ex) 
catch (cryptographicexception ex) 
catch (argumentexception ex) 
catch (exception ex) 
finally 
return m_strdecrypt;
} #endregion
}}

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