完整加密类（提供MD5，SHA1，SHA256，SHA512，DES加密和解密）

来源：互联网发布：spine for mac 编辑：程序博客网时间：2024/05/16 11:20
 /// <summary>    /// 类名：HashEncrypt    /// 作用：对传入的字符串进行Hash运算，返回通过Hash算法加密过的字串。    /// 属性：［无］    /// 构造函数额参数：    /// IsReturnNum:是否返回为加密后字符的Byte代码    /// IsCaseSensitive：是否区分大小写。    /// 方法：此类提供MD5，SHA1，SHA256，SHA512等四种算法，加密字串的长度依次增大。    /// </summary>    public class HashEncrypt    {        //private string strIN;        private bool isReturnNum;        private bool isCaseSensitive;        public HashEncrypt(bool IsCaseSensitive, bool IsReturnNum)        {            this.isReturnNum = IsReturnNum;            this.isCaseSensitive = IsCaseSensitive;        }        private string GetStrIN(string strIN)        {            //string strIN = strIN;            if (strIN.Length == 0)            {                strIN = "~NULL~";            }            if (isCaseSensitive == false)            {                strIN = strIN.ToUpper();            }            return strIN;        }        public string MD5Encrypt(string strIN)        {            //string strIN = getstrIN(strIN);            byte[] tmpByte;            MD5 md5 = new MD5CryptoServiceProvider();            tmpByte = md5.ComputeHash(GetKeyByteArray(GetStrIN(strIN)));            md5.Clear();            return GetStringValue(tmpByte);        }        public string SHA1Encrypt(string strIN)        {            //string strIN = getstrIN(strIN);            byte[] tmpByte;            SHA1 sha1 = new SHA1CryptoServiceProvider();            tmpByte = sha1.ComputeHash(GetKeyByteArray(strIN));            sha1.Clear();            return GetStringValue(tmpByte);        }        public string SHA256Encrypt(string strIN)        {            //string strIN = getstrIN(strIN);            byte[] tmpByte;            SHA256 sha256 = new SHA256Managed();            tmpByte = sha256.ComputeHash(GetKeyByteArray(strIN));            sha256.Clear();            return GetStringValue(tmpByte);        }        public string SHA512Encrypt(string strIN)        {            //string strIN = getstrIN(strIN);            byte[] tmpByte;            SHA512 sha512 = new SHA512Managed();            tmpByte = sha512.ComputeHash(GetKeyByteArray(strIN));            sha512.Clear();            return GetStringValue(tmpByte);        }        /// <summary>        /// 使用DES加密（Added by niehl 2005-4-6）        /// </summary>        /// <param name="originalValue">待加密的字符串</param>        /// <param name="key">密钥(最大长度8)</param>        /// <param name="IV">初始化向量(最大长度8)</param>        /// <returns>加密后的字符串</returns>        public string DESEncrypt(string originalValue, string key, string IV)        {            //将key和IV处理成8个字符            key += "12345678";            IV += "12345678";            key = key.Substring(0, 8);            IV = IV.Substring(0, 8);            SymmetricAlgorithm sa = new DESCryptoServiceProvider();            sa.Key = Encoding.UTF8.GetBytes(key);            sa.IV = Encoding.UTF8.GetBytes(IV);            ICryptoTransform ct = sa.CreateEncryptor();            byte[] byt = Encoding.UTF8.GetBytes(originalValue);            MemoryStream ms = new MemoryStream();            CryptoStream cs = new CryptoStream(ms, ct,           CryptoStreamMode.Write);            cs.Write(byt, 0, byt.Length);            cs.FlushFinalBlock();            cs.Close();            return Convert.ToBase64String(ms.ToArray());        }        public string DESEncrypt(string originalValue, string key)        {            return DESEncrypt(originalValue, key, key);        }        /// <summary>        /// 使用DES解密（Added by niehl 2005-4-6）        /// </summary>        /// <param name="encryptedValue">待解密的字符串</param>        /// <param name="key">密钥(最大长度8)</param>        /// <param name="IV">m初始化向量(最大长度8)</param>        /// <returns>解密后的字符串</returns>        public string DESDecrypt(string encryptedValue, string key, string IV)        {            //将key和IV处理成8个字符            key += "12345678";            IV += "12345678";            key = key.Substring(0, 8);            IV = IV.Substring(0, 8);            SymmetricAlgorithm sa = new DESCryptoServiceProvider();            sa.Key = Encoding.UTF8.GetBytes(key);            sa.IV = Encoding.UTF8.GetBytes(IV);            ICryptoTransform ct = sa.CreateDecryptor();            byte[] byt = Convert.FromBase64String(encryptedValue);            MemoryStream ms = new MemoryStream();            CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);            cs.Write(byt, 0, byt.Length);            cs.FlushFinalBlock();            cs.Close();            return Encoding.UTF8.GetString(ms.ToArray());        }        public string DESDecrypt(string encryptedValue, string key)        {            return DESDecrypt(encryptedValue, key, key);        }        private string GetStringValue(byte[] Byte)        {            string tmpString = string.Empty;            if (this.isReturnNum == false)            {                ASCIIEncoding Asc = new ASCIIEncoding();                tmpString = Asc.GetString(Byte);            }            else            {                int iCounter;                for (iCounter = 0; iCounter < Byte.Length; iCounter++)                {                    tmpString = tmpString + Byte[iCounter].ToString();                }            }            return tmpString;        }        private byte[] GetKeyByteArray(string strKey)        {            ASCIIEncoding Asc = new ASCIIEncoding();            int tmpStrLen = strKey.Length;            byte[] tmpByte = new byte[tmpStrLen - 1];            tmpByte = Asc.GetBytes(strKey);            return tmpByte;        }    }