?????最近一段時間,集團加強了資安方面的管理,所有敏感的配置字節都必須經過加密處理,把最近用到的幾個加解密類整理了一下,以做備忘.

??? 其實這兩個類實現的方法差不多,只是有些細微區別:

對稱加密演算法類 SymmetricMethodHelper
using?System;
using?System.IO;
using?System.Security.Cryptography;
using?System.Text;

///?<summary>
///?對稱加密演算法類
///?</summary>
public?class?SymmetricMethodHelper
{
????private?SymmetricAlgorithm?mobjCryptoService;
????private?string?Key;
????///?<summary>
????///?對稱加密類的構造函數
????///?</summary>
????public?SymmetricMethodHelper()
????{
????????mobjCryptoService?=?new?RijndaelManaged();
????????Key?=?"Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";
????}

????///?<summary>
????///?對稱加密類的構造函數
????///?</summary>
????public?SymmetricMethodHelper(string?key)
????{
????????mobjCryptoService?=?new?RijndaelManaged();
????????Key?=?key?+?"Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";
????}

????///?<summary>
????///?獲得密鑰
????///?</summary>
????///?<returns>密鑰</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>
????///?獲得初始向量IV
????///?</summary>
????///?<returns>初試向量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>經過加密的串</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>經過解密的串</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();
????}
}

?

?

Code
using?System;
using?System.Text;
using?System.IO;
using?System.Security.Cryptography;

public?class?EncryptUtil?{
????????///?<summary>
????????///?Des加密
????????///?</summary>
????????///?<param?name="clearText"></param>
????????///?<returns></returns>
????????public?static?string?DesEncrypt(string?clearText)?{
????????????byte[]?byKey?=?System.Text.ASCIIEncoding.UTF8.GetBytes(KEY_64);
????????????byte[]?byIV?=?System.Text.ASCIIEncoding.UTF8.GetBytes(IV_64);

????????????DESCryptoServiceProvider?cryptoProvider?=?new?DESCryptoServiceProvider();

????????????MemoryStream?memStream?=?new?MemoryStream();
????????????//以寫模式?把數據流和要加密的數據流建立連接
????????????CryptoStream?cryStream?=?new?CryptoStream(memStream,?cryptoProvider.CreateEncryptor(byKey,?byIV),?CryptoStreamMode.Write);

????????????//將要加密的數據轉換為UTF8編碼的數組

????????????byte[]?clearTextArray?=?Encoding.UTF8.GetBytes(clearText);

????????????//加密?並寫到?內存流memStream中

????????????cryStream.Write(clearTextArray,?0,?clearTextArray.Length);
????????????//清空緩衝區
????????????cryStream.FlushFinalBlock();

????????????//將8位無符號整數數組?轉換為?等效的System.String?的形式.
????????????return?Convert.ToBase64String(memStream.ToArray());
????????}

????????///?<summary>
????????///?Des解密
????????///?</summary>
????????///?<param?name="data"></param>
????????///?<returns></returns>
????????public?static?string?DesDecrypt(string?encryptedText)?{
????????????byte[]?byKey?=?System.Text.ASCIIEncoding.UTF8.GetBytes(KEY_64);
????????????byte[]?byIV?=?System.Text.ASCIIEncoding.UTF8.GetBytes(IV_64);

????????????//
????????????byte[]?byteArray?=?Convert.FromBase64String(encryptedText);

????????????MemoryStream?memStream?=?new?MemoryStream();

????????????DESCryptoServiceProvider?cryptoProvider?=?new?DESCryptoServiceProvider();
????????????CryptoStream?cryStream?=?new?CryptoStream(memStream,?cryptoProvider.CreateDecryptor(byKey,?byIV),?CryptoStreamMode.Write);

????????????cryStream.Write(byteArray,?0,?byteArray.Length);
????????????//清空緩衝區
????????????cryStream.FlushFinalBlock();

????????????System.Text.Encoding?encoding?=?new?System.Text.UTF8Encoding();
????????????//把字節數組轉換為?等效的System.String?的形式.
????????????return?encoding.GetString(memStream.ToArray());
????????}


????????///?<summary>
????????///?Des加密,功能同DesEncrypt相同
????????///?</summary>
????????///?<param?name="clearText"></param>
????????///?<returns></returns>
????????public?static?string?DesEncode(string?clearText)?{
????????????byte[]?byKey?=?System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
????????????byte[]?byIV?=?System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

????????????DESCryptoServiceProvider?cryptoProvider?=?new?DESCryptoServiceProvider();

????????????MemoryStream?memStream?=?new?MemoryStream();
????????????CryptoStream?cryStream?=?new?CryptoStream(memStream,?cryptoProvider.CreateEncryptor(byKey,?byIV),?CryptoStreamMode.Write);

????????????StreamWriter?sw?=?new?StreamWriter(cryStream);
????????????sw.Write(clearText);
????????????sw.Flush();
????????????cryStream.FlushFinalBlock();
????????????sw.Flush();
????????????return?Convert.ToBase64String(memStream.GetBuffer(),?0,?(int)memStream.Length);

????????}

????????///?<summary>
????????///?Des解密,功能同DesDecrypt相同
????????///?</summary>
????????///?<param?name="encryptedText"></param>
????????///?<returns></returns>
????????public?static?string?DesDecode(string?encryptedText)?{
????????????byte[]?byKey?=?System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
????????????byte[]?byIV?=?System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

????????????byte[]?byteArray;
????????????try?{
????????????????byteArray?=?Convert.FromBase64String(encryptedText);
????????????}
????????????catch?{
????????????????return?null;
????????????}

????????????DESCryptoServiceProvider?cryptoProvider?=?new?DESCryptoServiceProvider();
????????????MemoryStream?memStream?=?new?MemoryStream(byteArray);
????????????CryptoStream?cryStream?=?new?CryptoStream(memStream,?cryptoProvider.CreateDecryptor(byKey,?byIV),?CryptoStreamMode.Read);
????????????StreamReader?sr?=?new?StreamReader(cryStream);
????????????
????????????return?sr.ReadToEnd();
????????}

????????private?const?string?KEY_64?=?"MyPubKey";??//公鈅
????????private?const?string?IV_64?=?"MyPriKey";???//私鈅,注意了:是8個字符，64位


????}
???? 注意這兩段代碼標注為紅色部分的差異,其中SymmetricMethodHelper類支持超過8位的私鑰,而EncryptUtil類不支持超過8位的私鑰.?

轉載于:https://www.cnblogs.com/Jebel/archive/2008/08/13/1267002.html

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