????????private?static?readonly?string?Default_AES_Key?=?"@#kim123";
????????private?static?byte[]?Keys?=?{?0x41,?0x72,?0x65,?0x79,?0x6F,?0x75,?0x6D,?0x79,
?????????????????????????????????????????????0x53,0x6E,?0x6F,?0x77,?0x6D,?0x61,?0x6E,?0x3F?};
????????///?<summary>
????????///?对称加密算法AES?RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法)
????????///?</summary>
????????///?<param?name="encryptString">待加密字符串</param>
????????///?<returns>加密结果字符串</returns>
????????public?static?string?AES_Encrypt(string?encryptString)
????????{
????????????return?AES_Encrypt(encryptString,?Default_AES_Key);
????????}
????????///?<summary>
????????///?对称加密算法AES?RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法)
????????///?</summary>
????????///?<param?name="encryptString">待加密字符串</param>
????????///?<param?name="encryptKey">加密密钥，须半角字符</param>
????????///?<returns>加密结果字符串</returns>
????????public?static?string?AES_Encrypt(string?encryptString,?string?encryptKey)
????????{
????????????encryptKey?=?GetSubString(encryptKey,?32,?"");
????????????encryptKey?=?encryptKey.PadRight(32,?‘?‘);
????????????RijndaelManaged?rijndaelProvider?=?new?RijndaelManaged();
????????????rijndaelProvider.Key?=?Encoding.UTF8.GetBytes(encryptKey.Substring(0,?32));
????????????rijndaelProvider.IV?=?Keys;
????????????ICryptoTransform?rijndaelEncrypt?=?rijndaelProvider.CreateEncryptor();
????????????byte[]?inputData?=?Encoding.UTF8.GetBytes(encryptString);
????????????byte[]?encryptedData?=?rijndaelEncrypt.TransformFinalBlock(inputData,?0,?inputData.Length);
????????????return?Convert.ToBase64String(encryptedData);
????????}
????????///?<summary>
????????///?对称加密算法AES?RijndaelManaged解密字符串
????????///?</summary>
????????///?<param?name="decryptString">待解密的字符串</param>
????????///?<returns>解密成功返回解密后的字符串,失败返源串</returns>
????????public?static?string?AES_Decrypt(string?decryptString)
????????{
????????????return?AES_Decrypt(decryptString,?Default_AES_Key);
????????}
????????///?<summary>
????????///?对称加密算法AES?RijndaelManaged解密字符串
????????///?</summary>
????????///?<param?name="decryptString">待解密的字符串</param>
????????///?<param?name="decryptKey">解密密钥,和加密密钥相同</param>
????????///?<returns>解密成功返回解密后的字符串,失败返回空</returns>
????????public?static?string?AES_Decrypt(string?decryptString,?string?decryptKey)
????????{
????????????try
????????????{
????????????????decryptKey?=?GetSubString(decryptKey,?32,?"");
????????????????decryptKey?=?decryptKey.PadRight(32,?‘?‘);
????????????????RijndaelManaged?rijndaelProvider?=?new?RijndaelManaged();
????????????????rijndaelProvider.Key?=?Encoding.UTF8.GetBytes(decryptKey);
????????????????rijndaelProvider.IV?=?Keys;
????????????????ICryptoTransform?rijndaelDecrypt?=?rijndaelProvider.CreateDecryptor();
????????????????byte[]?inputData?=?Convert.FromBase64String(decryptString);
????????????????byte[]?decryptedData?=?rijndaelDecrypt.TransformFinalBlock(inputData,?0,?inputData.Length);
????????????????return?Encoding.UTF8.GetString(decryptedData);
????????????}
????????????catch
????????????{
????????????????return?string.Empty;
????????????}
????????}
????????///?<summary>
????????///?按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分
????????///?</summary>
????????///?<param?name="sourceString">源字符串</param>
????????///?<param?name="length">所取字符串字节长度</param>
????????///?<param?name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param>
????????///?<returns>某字符串的一部分</returns>
????????private?static?string?GetSubString(string?sourceString,?int?length,?string?tailString)
????????{
????????????return?GetSubString(sourceString,?0,?length,?tailString);
????????}
????????///?<summary>
????????///?按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分
????????///?</summary>
????????///?<param?name="sourceString">源字符串</param>
????????///?<param?name="startIndex">索引位置，以0开始</param>
????????///?<param?name="length">所取字符串字节长度</param>
????????///?<param?name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param>
????????///?<returns>某字符串的一部分</returns>
????????private?static?string?GetSubString(string?sourceString,?int?startIndex,?int?length,?string?tailString)
????????{
????????????string?myResult?=?sourceString;
????????????//当是日文或韩文时(注:中文的范围:\u4e00?-?\u9fa5,?日文在\u0800?-?\u4e00,?韩文为\xAC00-\xD7A3)
????????????if?(System.Text.RegularExpressions.Regex.IsMatch(sourceString,?"[\u0800-\u4e00]+")?||
????????????????System.Text.RegularExpressions.Regex.IsMatch(sourceString,?"[\xAC00-\xD7A3]+"))
????????????{
????????????????//当截取的起始位置超出字段串长度时
????????????????if?(startIndex?>=?sourceString.Length)
????????????????{
????????????????????return?string.Empty;
????????????????}
????????????????else
????????????????{
????????????????????return?sourceString.Substring(startIndex,
???????????????????????????????????????????????????((length?+?startIndex)?>?sourceString.Length)???(sourceString.Length?-?startIndex)?:?length);
????????????????}
????????????}
????????????//中文字符，如"中国人民abcd123"
????????????if?(length?<=?0)
????????????{
????????????????return?string.Empty;
????????????}
????????????byte[]?bytesSource?=?Encoding.Default.GetBytes(sourceString);
????????????//当字符串长度大于起始位置
????????????if?(bytesSource.Length?>?startIndex)
????????????{
????????????????int?endIndex?=?bytesSource.Length;
????????????????//当要截取的长度在字符串的有效长度范围内
????????????????if?(bytesSource.Length?>?(startIndex?+?length))
????????????????{
????????????????????endIndex?=?length?+?startIndex;
????????????????}
????????????????else
????????????????{???//当不在有效范围内时,只取到字符串的结尾
????????????????????length?=?bytesSource.Length?-?startIndex;
????????????????????tailString?=?"";
????????????????}
????????????????int[]?anResultFlag?=?new?int[length];
????????????????int?nFlag?=?0;
????????????????//字节大于127为双字节字符
????????????????for?(int?i?=?startIndex;?i?<?endIndex;?i++)
????????????????{
????????????????????if?(bytesSource[i]?>?127)
????????????????????{
????????????????????????nFlag++;
????????????????????????if?(nFlag?==?3)
????????????????????????{
????????????????????????????nFlag?=?1;
????????????????????????}
????????????????????}
????????????????????else
????????????????????{
????????????????????????nFlag?=?0;
????????????????????}
????????????????????anResultFlag[i]?=?nFlag;
????????????????}
????????????????//最后一个字节为双字节字符的一半
????????????????if?((bytesSource[endIndex?-?1]?>?127)?&&?(anResultFlag[length?-?1]?==?1))
????????????????{
????????????????????length?=?length?+?1;
????????????????}
????????????????byte[]?bsResult?=?new?byte[length];
????????????????Array.Copy(bytesSource,?startIndex,?bsResult,?0,?length);
????????????????myResult?=?Encoding.Default.GetString(bsResult);
????????????????myResult?=?myResult?+?tailString;
????????????????return?myResult;
????????????}
????????????return?string.Empty;
????????}
????????///?<summary>
????????///?加密文件流
????????///?</summary>
????????///?<param?name="fs"></param>
????????///?<returns></returns>
????????public?static?CryptoStream?AES_EncryptStrream(FileStream?fs,?string?decryptKey)
????????{
????????????decryptKey?=?GetSubString(decryptKey,?32,?"");
????????????decryptKey?=?decryptKey.PadRight(32,?‘?‘);
????????????RijndaelManaged?rijndaelProvider?=?new?RijndaelManaged();
????????????rijndaelProvider.Key?=?Encoding.UTF8.GetBytes(decryptKey);
????????????rijndaelProvider.IV?=?Keys;
????????????ICryptoTransform?encrypto?=?rijndaelProvider.CreateEncryptor();
????????????CryptoStream?cytptostreamEncr?=?new?CryptoStream(fs,?encrypto,?CryptoStreamMode.Write);
????????????return?cytptostreamEncr;
????????}
????????///?<summary>
????????///?解密文件流
????????///?</summary>
????????///?<param?name="fs"></param>
????????///?<returns></returns>
????????public?static?CryptoStream?AES_DecryptStream(FileStream?fs,?string?decryptKey)
????????{
????????????decryptKey?=?GetSubString(decryptKey,?32,?"");
????????????decryptKey?=?decryptKey.PadRight(32,?‘?‘);
????????????RijndaelManaged?rijndaelProvider?=?new?RijndaelManaged();
????????????rijndaelProvider.Key?=?Encoding.UTF8.GetBytes(decryptKey);
????????????rijndaelProvider.IV?=?Keys;
????????????ICryptoTransform?Decrypto?=?rijndaelProvider.CreateDecryptor();
????????????CryptoStream?cytptostreamDecr?=?new?CryptoStream(fs,?Decrypto,?CryptoStreamMode.Read);
????????????return?cytptostreamDecr;
????????}
????????///?<summary>
????????///?对指定文件加密
????????///?</summary>
????????///?<param?name="InputFile"></param>
????????///?<param?name="OutputFile"></param>
????????///?<returns></returns>
????????public?static?bool?AES_EncryptFile(string?InputFile,?string?OutputFile)
????????{
????????????try
????????????{
????????????????string?decryptKey?=?"www.iqidi.com";
????????????????FileStream?fr?=?new?FileStream(InputFile,?FileMode.Open);
????????????????FileStream?fren?=?new?FileStream(OutputFile,?FileMode.Create);
????????????????CryptoStream?Enfr?=?AES_EncryptStrream(fren,?decryptKey);
????????????????byte[]?bytearrayinput?=?new?byte[fr.Length];
????????????????fr.Read(bytearrayinput,?0,?bytearrayinput.Length);
????????????????Enfr.Write(bytearrayinput,?0,?bytearrayinput.Length);
????????????????Enfr.Close();
????????????????fr.Close();
????????????????fren.Close();
????????????}
????????????catch
????????????{
????????????????//文件异常
????????????????return?false;
????????????}
????????????return?true;
????????}
????????///?<summary>
????????///?对指定的文件解压缩
????????///?</summary>
????????///?<param?name="InputFile"></param>
????????///?<param?name="OutputFile"></param>
????????///?<returns></returns>
????????public?static?bool?AES_DecryptFile(string?InputFile,?string?OutputFile)
????????{
????????????try
????????????{
????????????????string?decryptKey?=?"www.iqidi.com";
????????????????FileStream?fr?=?new?FileStream(InputFile,?FileMode.Open);
????????????????FileStream?frde?=?new?FileStream(OutputFile,?FileMode.Create);
????????????????CryptoStream?Defr?=?AES_DecryptStream(fr,?decryptKey);
????????????????byte[]?bytearrayoutput?=?new?byte[1024];
????????????????int?m_count?=?0;
????????????????do
????????????????{
????????????????????m_count?=?Defr.Read(bytearrayoutput,?0,?bytearrayoutput.Length);
????????????????????frde.Write(bytearrayoutput,?0,?m_count);
????????????????????if?(m_count?<?bytearrayoutput.Length)
????????????????????????break;
????????????????}?while?(true);
????????????????Defr.Close();
????????????????fr.Close();
????????????????frde.Close();
????????????}
????????????catch
????????????{
????????????????//文件异常
????????????????return?false;
????????????}
????????????return?true;
????????}
????????
????????#endregion
撰写人：伍华聪??