加密解密算法收藏

1、MD5加密解密

    不可逆加密：

    需要引用命名空间：

     using System.Security.Cryptography;
    using System.Text;
    using System.Web.Security;

        /// <summary>
        /// MD5 64位加密
        /// </summary>
        /// <param name="Sourcein">需要加密的字符串</param>
        /// <returns></returns>
        public static String MD5(String Sourcein)
        {
            MD5CryptoServiceProvider provider = new MD5CryptoServiceProvider();
            byte[] bytes = Encoding.UTF8.GetBytes(Sourcein);
            return Convert.ToBase64String(provider.ComputeHash(bytes));
        }


        /// <summary>
        /// MD5 32位加密
        /// </summary>
        /// <param name="Sourcein">需要加密的字符串</param>
        /// <returns></returns>
        public static String MD5_32(String Sourcein)
        {
            return FormsAuthentication.HashPasswordForStoringInConfigFile(Sourcein, "MD5");
        }

    加密解密对：

       

      #region ========加密========

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Encrypt(string Text)
        {
            return Encrypt(Text, "key");//key:加解密密钥
        }
        /// <summary> 
        /// 加密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Encrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            return ret.ToString();
        }

        #endregion

        #region ========解密========


        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Decrypt(string Text)
        {
            return Decrypt(Text, "key");//key:加解密密钥
        }
        /// <summary> 
        /// 解密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Decrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        }

        #endregion 

 2.RSA 加密解密

  需要引用的命名空间

   using System;
   using System.Text;
   using System.Security.Cryptography;

  

        #region RSA 加密解密

        #region RSA 的密钥产生

        /// <summary>
        /// RSA 的密钥产生 产生私钥 和公钥 
        /// </summary>
        /// <param name="xmlKeys"></param>
        /// <param name="xmlPublicKey"></param>
        public void RSAKey(out string xmlKeys, out string xmlPublicKey)
        {
            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            xmlKeys = rsa.ToXmlString(true);
            xmlPublicKey = rsa.ToXmlString(false);
        }
        #endregion

        #region RSA的加密函数
        //############################################################################## 
        //RSA 方式加密 
        //说明KEY必须是XML的行式,返回的是字符串 
        //在有一点需要说明！！该加密方式有 长度 限制的！！ 
        //############################################################################## 

        //RSA的加密函数  string
        public string RSAEncrypt(string xmlPublicKey, string m_strEncryptString)
        {

            byte[] PlainTextBArray;
            byte[] CypherTextBArray;
            string Result;
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xmlPublicKey);
            PlainTextBArray = (new UnicodeEncoding()).GetBytes(m_strEncryptString);
            CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
            Result = Convert.ToBase64String(CypherTextBArray);
            return Result;

        }
        //RSA的加密函数 byte[]
        public string RSAEncrypt(string xmlPublicKey, byte[] EncryptString)
        {

            byte[] CypherTextBArray;
            string Result;
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xmlPublicKey);
            CypherTextBArray = rsa.Encrypt(EncryptString, false);
            Result = Convert.ToBase64String(CypherTextBArray);
            return Result;

        }
        #endregion

        #region RSA的解密函数
        //RSA的解密函数  string
        public string RSADecrypt(string xmlPrivateKey, string m_strDecryptString)
        {
            byte[] PlainTextBArray;
            byte[] DypherTextBArray;
            string Result;
            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xmlPrivateKey);
            PlainTextBArray = Convert.FromBase64String(m_strDecryptString);
            DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);
            Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
            return Result;

        }

        //RSA的解密函数  byte
        public string RSADecrypt(string xmlPrivateKey, byte[] DecryptString)
        {
            byte[] DypherTextBArray;
            string Result;
            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xmlPrivateKey);
            DypherTextBArray = rsa.Decrypt(DecryptString, false);
            Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
            return Result;

        }
        #endregion

        #endregion

        #region RSA数字签名

        #region 获取Hash描述表
        //获取Hash描述表 
        public bool GetHash(string m_strSource, ref byte[] HashData)
        {
            //从字符串中取得Hash描述 
            byte[] Buffer;
            System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
            Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(m_strSource);
            HashData = MD5.ComputeHash(Buffer);

            return true;
        }

        //获取Hash描述表 
        public bool GetHash(string m_strSource, ref string strHashData)
        {

            //从字符串中取得Hash描述 
            byte[] Buffer;
            byte[] HashData;
            System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
            Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(m_strSource);
            HashData = MD5.ComputeHash(Buffer);

            strHashData = Convert.ToBase64String(HashData);
            return true;

        }

        //获取Hash描述表 
        public bool GetHash(System.IO.FileStream objFile, ref byte[] HashData)
        {

            //从文件中取得Hash描述 
            System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
            HashData = MD5.ComputeHash(objFile);
            objFile.Close();

            return true;

        }

        //获取Hash描述表 
        public bool GetHash(System.IO.FileStream objFile, ref string strHashData)
        {

            //从文件中取得Hash描述 
            byte[] HashData;
            System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
            HashData = MD5.ComputeHash(objFile);
            objFile.Close();

            strHashData = Convert.ToBase64String(HashData);

            return true;

        }
        #endregion

        #region RSA签名
        //RSA签名 
        public bool SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, ref byte[] EncryptedSignatureData)
        {

            System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

            RSA.FromXmlString(p_strKeyPrivate);
            System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
            //设置签名的算法为MD5 
            RSAFormatter.SetHashAlgorithm("MD5");
            //执行签名 
            EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

            return true;

        }

        //RSA签名 
        public bool SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, ref string m_strEncryptedSignatureData)
        {

            byte[] EncryptedSignatureData;

            System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

            RSA.FromXmlString(p_strKeyPrivate);
            System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
            //设置签名的算法为MD5 
            RSAFormatter.SetHashAlgorithm("MD5");
            //执行签名 
            EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

            m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);

            return true;

        }

        //RSA签名 
        public bool SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, ref byte[] EncryptedSignatureData)
        {

            byte[] HashbyteSignature;

            HashbyteSignature = Convert.FromBase64String(m_strHashbyteSignature);
            System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

            RSA.FromXmlString(p_strKeyPrivate);
            System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
            //设置签名的算法为MD5 
            RSAFormatter.SetHashAlgorithm("MD5");
            //执行签名 
            EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

            return true;

        }

        //RSA签名 
        public bool SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, ref string m_strEncryptedSignatureData)
        {

            byte[] HashbyteSignature;
            byte[] EncryptedSignatureData;

            HashbyteSignature = Convert.FromBase64String(m_strHashbyteSignature);
            System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

            RSA.FromXmlString(p_strKeyPrivate);
            System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
            //设置签名的算法为MD5 
            RSAFormatter.SetHashAlgorithm("MD5");
            //执行签名 
            EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

            m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);

            return true;

        }
        #endregion

        #region RSA 签名验证

        public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, byte[] DeformatterData)
        {

            System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

            RSA.FromXmlString(p_strKeyPublic);
            System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
            //指定解密的时候HASH算法为MD5 
            RSADeformatter.SetHashAlgorithm("MD5");

            if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
            {
                return true;
            }
            else
            {
                return false;
            }

        }

        public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, byte[] DeformatterData)
        {

            byte[] HashbyteDeformatter;

            HashbyteDeformatter = Convert.FromBase64String(p_strHashbyteDeformatter);

            System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

            RSA.FromXmlString(p_strKeyPublic);
            System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
            //指定解密的时候HASH算法为MD5 
            RSADeformatter.SetHashAlgorithm("MD5");

            if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
            {
                return true;
            }
            else
            {
                return false;
            }

        }

        public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, string p_strDeformatterData)
        {

            byte[] DeformatterData;

            System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

            RSA.FromXmlString(p_strKeyPublic);
            System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
            //指定解密的时候HASH算法为MD5 
            RSADeformatter.SetHashAlgorithm("MD5");

            DeformatterData = Convert.FromBase64String(p_strDeformatterData);

            if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
            {
                return true;
            }
            else
            {
                return false;
            }

        }

        public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, string p_strDeformatterData)
        {

            byte[] DeformatterData;
            byte[] HashbyteDeformatter;

            HashbyteDeformatter = Convert.FromBase64String(p_strHashbyteDeformatter);
            System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

            RSA.FromXmlString(p_strKeyPublic);
            System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
            //指定解密的时候HASH算法为MD5 
            RSADeformatter.SetHashAlgorithm("MD5");

            DeformatterData = Convert.FromBase64String(p_strDeformatterData);

            if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
            {
                return true;
            }
            else
            {
                return false;
            }

        }


        #endregion


        #endregion