.net实现md5加密 sha1加密 sha256加密 sha384加密 sha512加密 des加密解密

关键代码

using System.Security;

using System.Security.Cryptography;

using System.Web;

using System.IO;

        //ＭＤ5　　　　　　　不区分大小写的

        //type 类型，16位还是32位，16位就是取32位的第8到16位

        public string DoMd5Encode(string pwd,string type)

        {

            byte[] result = Encoding.Default.GetBytes(pwd);

            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

            byte[] output = md5.ComputeHash(result);

            if (type == "16")

                return BitConverter.ToString(output).Replace("-", "").ToLower().Substring(8,16);    

            else

                return BitConverter.ToString(output).Replace("-", "").ToLower();    

            

        }

        /// <summary>

        /// 对字符串进行SHA1加密

        /// </summary>

        /// <param name="strIN">需要加密的字符串</param>

        /// <returns>密文</returns>

        public string SHA1_Encrypt(string Source_String)

        {

            byte[] StrRes = Encoding.Default.GetBytes(Source_String);

            HashAlgorithm iSHA = new SHA1CryptoServiceProvider();

            StrRes = iSHA.ComputeHash(StrRes);

            StringBuilder EnText = new StringBuilder();

            foreach (byte iByte in StrRes)

            {

                EnText.AppendFormat("{0:x2}", iByte);

            }

            return EnText.ToString();

        }
        /// <summary>

        /// SHA256加密，不可逆转

        /// </summary>

        /// <param name="str">string str:被加密的字符串</param>

        /// <returns>返回加密后的字符串</returns>

        private string SHA256Encrypt(string str)

        {

            System.Security.Cryptography.SHA256 s256 = new System.Security.Cryptography.SHA256Managed();

            byte[] byte1;

            byte1 = s256.ComputeHash(Encoding.Default.GetBytes(str));

            s256.Clear();

            return Convert.ToBase64String(byte1);

        }
       /// <summary>

        /// SHA384加密，不可逆转

        /// </summary>

        /// <param name="str">string str:被加密的字符串</param>

        /// <returns>返回加密后的字符串</returns>

        private string SHA384Encrypt(string str)

        {

            System.Security.Cryptography.SHA384 s384 = new System.Security.Cryptography.SHA384Managed();

            byte[] byte1;

            byte1 = s384.ComputeHash(Encoding.Default.GetBytes(str));

            s384.Clear();

            return Convert.ToBase64String(byte1);

        }

        /// <summary>

        /// SHA512加密，不可逆转

        /// </summary>

        /// <param name="str">string str:被加密的字符串</param>

        /// <returns>返回加密后的字符串</returns>

        private string SHA512Encrypt(string str)

        {

            System.Security.Cryptography.SHA512 s512 = new System.Security.Cryptography.SHA512Managed();

            byte[] byte1;

            byte1 = s512.ComputeHash(Encoding.Default.GetBytes(str));

            s512.Clear();

            return Convert.ToBase64String(byte1);

        }

        //默认密钥向量

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

        /// <summary>

        /// DES加密字符串

        /// </summary>

        /// <param name="encryptString">待加密的字符串</param>

        /// <param name="encryptKey">加密密钥,要求为8位</param>

        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>

        public string EncryptDES(string encryptString, string encryptKey)

        {

            try

            {

                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));

                byte[] rgbIV = Keys;

                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);

                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();

                MemoryStream mStream = new MemoryStream();

                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

                cStream.Write(inputByteArray, 0, inputByteArray.Length);

                cStream.FlushFinalBlock();

                return Convert.ToBase64String(mStream.ToArray());

            }

            catch

            {

                return encryptString;

            }

        }
        /// <summary>

        /// DES解密字符串

        /// </summary>

        /// <param name="decryptString">待解密的字符串</param>

        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>

        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>

        public string DecryptDES(string decryptString, string decryptKey)

        {

            try

            {

                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));

                byte[] rgbIV = Keys;

                byte[] inputByteArray = Convert.FromBase64String(decryptString);

                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();

                MemoryStream mStream = new MemoryStream();

                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

                cStream.Write(inputByteArray, 0, inputByteArray.Length);

                cStream.FlushFinalBlock();

                return Encoding.UTF8.GetString(mStream.ToArray());

            }

            catch

            {

                return decryptString;

            }

        }