【C#公共幫助類】給大家分享一些加密演算法（DES、HashCode、RSA、AES等）

AES 高級加密標準（英語：Advanced Encryption Standard，縮寫：AES），在密碼學中又稱Rijndael加密法，是美國聯邦政府採用的一種區塊加密標準。這個標準用來替代原先的DES，已經被多方分析且廣為全世界所使用。AES先進加密演算法是一向被認為牢不可破的加密演算法，針對這項 ...

AES

高級加密標準（英語：Advanced Encryption Standard，縮寫：AES），在密碼學中又稱Rijndael加密法，是美國聯邦政府採用的一種區塊加密標準。這個標準用來替代原先的DES，已經被多方分析且廣為全世界所使用。AES先進加密演算法是一向被認為牢不可破的加密演算法，針對這項加密演算法的攻擊是異常複雜的，事實上想要完全破解AES花費的時間要以數十億年計，極大的保證了數據的安全性。

這裡有兩個加密、解密方法：一種是帶密鑰的加密；一種是動態加密，就是不需要密鑰，密鑰被動態生成並且保存在密文中，解密時先解密密鑰，在解密密文。

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

namespace Common.CryptHelper
{
    public class AESCrypt
    {
       public const string RET_ERROR = "x07x07x07x07x07";
       private byte[] _IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF, 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
       private byte[] _Key = { 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 };
       private const string CRYPTO_KEY = "ADVANCEDENCRYPTIONSTANDARD";
       private int CRYPTO_KEY_LENGTH = 32;
  
       private AesCryptoServiceProvider m_aesCryptoServiceProvider;
       private string m_message;
       public string Message
       {
           get { return m_message; }
           set { m_message = value; }
       }
       private bool m_containKey;
       /// <summary>
       /// True：密文中包含密鑰
       /// False：密文中不包含密鑰
       /// </summary>
       public bool ContainKey
       {
           get { return m_containKey; }
           set { m_containKey = value; }
       }
       public AESCrypt()
       {
           m_aesCryptoServiceProvider = new AesCryptoServiceProvider();
           m_containKey = true;
           m_message = string.Empty;
       }
       public AESCrypt(bool containKey)
           : this()
       {
           m_containKey = containKey;
       }
       private string Encrypt(string s_crypto, byte[] key)
       {
           string s_encryped = string.Empty;
           byte[] crypto, encrypted;
           ICryptoTransform ct;
  
           try
           {
               crypto = string2Byte(s_crypto);
               m_aesCryptoServiceProvider.Key = key;
               m_aesCryptoServiceProvider.IV = _IV;
               ct = m_aesCryptoServiceProvider.CreateEncryptor();
               encrypted = ct.TransformFinalBlock(crypto, 0, crypto.Length);
               if (m_containKey)
               {
                   s_encryped += byte2HexString(key);
               }
               s_encryped += byte2HexString(encrypted);
               return s_encryped;
           }
           catch (Exception ex)
           {
               m_message = ex.ToString();
               return RET_ERROR;
           }
       }
        
       private string Decrypt(string s_encrypted, byte[] key)
       {
           string s_decrypted = string.Empty;
           byte[] encrypted, decrypted;
           ICryptoTransform ct;
  
           try
           {
               encrypted = hexString2Byte(s_encrypted);
               m_aesCryptoServiceProvider.Key = key;
               m_aesCryptoServiceProvider.IV = _IV;
               ct = m_aesCryptoServiceProvider.CreateDecryptor();
               decrypted = ct.TransformFinalBlock(encrypted, 0, encrypted.Length);
               s_decrypted += byte2String(decrypted);
               return s_decrypted;
           }
           catch (Exception ex)
           {
               m_message = ex.ToString();
               m_message = "Decrypt fail.";
               return RET_ERROR;
           }
       }
       #region 指定密鑰對明文進行AES加密、解密
       /// <summary>
       /// 指定密鑰對明文進行AES加密
       /// </summary>
       /// <param name="s_crypto">明文</param>
       /// <param name="s_key">加密密鑰</param>
       /// <returns></returns>
       public string Encrypt(string s_crypto, string s_key)
       {
           byte[] key = new byte[CRYPTO_KEY_LENGTH];

           byte[] temp = string2Byte(s_key);
           if (temp.Length > key.Length)
           {
               m_message = "Key too long,need less than 32 Bytes key.";
               return RET_ERROR;
           }
           key = string2Byte(s_key.PadRight(key.Length));
           return Encrypt(s_crypto, key);
       }
       /// <summary>
       /// 指定密鑰，並對密文進行解密
       /// </summary>
       /// <param name="s_encrypted">密文</param>
       /// <param name="s_key">密鑰</param>
       /// <returns></returns>
       public string Decrypt(string s_encrypted, string s_key)
       {
           byte[] key = new byte[CRYPTO_KEY_LENGTH];

           byte[] temp = string2Byte(s_key);
           if (temp.Length > key.Length)
           {
               m_message = "Key invalid.too long,need less than 32 Bytes";
               return RET_ERROR;
           }
           key = string2Byte(s_key.PadRight(key.Length));
           if (m_containKey)
           {
               s_encrypted = s_encrypted.Substring(CRYPTO_KEY_LENGTH * 2);
           }
           return Decrypt(s_encrypted, key);
       }      
       #endregion

       #region 動態生成密鑰，並對明文進行AES加密、解密
       /// <summary>
       /// 動態生成密鑰，並對明文進行AES加密
       /// </summary>
       /// <param name="s_crypto">明文</param>
       /// <returns></returns>
       public string Encrypt(string s_crypto)
       {
           byte[] key = new byte[CRYPTO_KEY_LENGTH];

           m_aesCryptoServiceProvider.GenerateKey();
           key = m_aesCryptoServiceProvider.Key;
           return Encrypt(s_crypto, key);
       }
       /// <summary>
       /// 從密文中解析出密鑰，並對密文進行解密
       /// </summary>
       /// <param name="s_encrypted">密文</param>
       /// <returns></returns>
       public string Decrypt(string s_encrypted)
       {
           string s_key = string.Empty;
           byte[] key = new byte[CRYPTO_KEY_LENGTH];
  
           if (s_encrypted.Length <= CRYPTO_KEY_LENGTH * 2)
           {
               m_message = "Encrypted string invalid.";
               return RET_ERROR;
           }
           if (m_containKey)
           {
               s_key = s_encrypted.Substring(0, CRYPTO_KEY_LENGTH * 2);
               s_encrypted = s_encrypted.Substring(CRYPTO_KEY_LENGTH * 2);
           }
           key = hexString2Byte(s_key);
           return Decrypt(s_encrypted, key);
       }
       #endregion

       #region 私有方法
       private string byte2HexString(byte[] bytes)
       {
           StringBuilder sb = new StringBuilder();
           foreach (byte b in bytes)
           {
               sb.AppendFormat("{0:X2}", b);
           }
           return sb.ToString();
       }
       private byte[] hexString2Byte(string hex)
       {
           int len = hex.Length / 2;
           byte[] bytes = new byte[len];
           for (int i = 0; i < len; i++)
           {
               bytes[i] = (byte)(Convert.ToInt32(hex.Substring(i * 2, 2), 16));
           }
           return bytes;
       }
       private byte[] string2Byte(string str)
       {
           return Encoding.UTF8.GetBytes(str);
       }
       private string byte2String(byte[] bytes)
       {
           return Encoding.UTF8.GetString(bytes);
       }
       #endregion

    
    }
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

DES

數據加密標準（DES，Data Encryption Standard）是一種對稱加密演算法，很可能是使用最廣泛的密鑰系統，特別是在保護金融數據的安全中，是安全性比較高的一種演算法，目前只有一種方法可以破解該演算法，那就是窮舉法。

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

namespace Common.CryptHelper
{
    /// <summary>
    /// DES加密/解密類。
    /// </summary>
    public class DESEncrypt
    {

        #region ========加密========

        /// <summary> 
        /// 加密數據 
        /// </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> 
        /// 解密數據 
        /// </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

    }
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

RSA

RSA是第一個既能用於數據加密也能用於數字簽名的演算法。它易於理解和操作，也很流行。演算法的名字以發明者的名字命名：Ron Rivest, Adi Shamir 和Leonard Adleman。但RSA的安全性一直未能得到理論上的證明。它經歷了各種攻擊，至今未被完全攻破。今天只有短的RSA鑰匙才可能被強力方式解破。到2008年為止，世界上還沒有任何可靠的攻擊RSA演算法的方式。只要其鑰匙的長度足夠長，用RSA加密的信息實際上是不能被解破的。但在分散式計算和量子電腦理論日趨成熟的今天，RSA加密安全性受到了挑戰。

using System; 
using System.Text; 
using System.Security.Cryptography;
namespace Common.CryptHelper
{ 
    /// <summary> 
    /// RSA加密解密及RSA簽名和驗證
    /// </summary> 
    public class RSACryption 
    {         
        public RSACryption() 
        {             
        } 
        

        #region RSA 加密解密 

        #region RSA 的密鑰產生 
    
        /// <summary>
        /// RSA 的密鑰產生 產生私鑰 和公鑰 
        /// </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的加密函數 
        //############################################################################## 
        //RSA 方式加密 
        //說明KEY必須是XML的行式,返回的是字元串 
        //在有一點需要說明！！該加密方式有 長度 限制的！！ 
        //############################################################################## 

        //RSA的加密函數  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的加密函數 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的解密函數 
        //RSA的解密函數  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的解密函數  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數字簽名 

        #region 獲取Hash描述表 
        //獲取Hash描述表 
        public bool GetHash(string m_strSource, ref byte[] HashData) 
        {             
            //從字元串中取得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;             
        } 

        //獲取Hash描述表 
        public bool GetHash(string m_strSource, ref string strHashData) 
        { 
            
            //從字元串中取得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; 
            
        } 

        //獲取Hash描述表 
        public bool GetHash(System.IO.FileStream objFile, ref byte[] HashData) 
        { 
            
            //從文件中取得Hash描述 
            System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5"); 
            HashData = MD5.ComputeHash(objFile); 
            objFile.Close(); 

            return true; 
            
        } 

        //獲取Hash描述表 
        public bool GetHash(System.IO.FileStream objFile, ref string strHashData) 
        { 
            
            //從文件中取得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簽名 
        //RSA簽名 
        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); 
                //設置簽名的演算法為MD5 
                RSAFormatter.SetHashAlgorithm("MD5"); 
                //執行簽名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature); 

                return true; 
            
        } 

        //RSA簽名 
        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); 
                //設置簽名的演算法為MD5 
                RSAFormatter.SetHashAlgorithm("MD5"); 
                //執行簽名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature); 

                m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData); 

                return true; 
            
        } 

        //RSA簽名 
        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); 
                //設置簽名的演算法為MD5 
                RSAFormatter.SetHashAlgorithm("MD5"); 
                //執行簽名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature); 

                return true; 
            
        } 

        //RSA簽名 
        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); 
                //設置簽名的演算法為MD5 
                RSAFormatter.SetHashAlgorithm("MD5"); 
                //執行簽名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature); 

                m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData); 

                return true; 
            
        } 
        #endregion 

        #region RSA 簽名驗證 

        public bool SignatureDeformatter(string p_strK

【C#公共幫助類】給大家分享一些加密演算法 （DES、HashCode、RSA、AES等）

【C#公共幫助類】給大家分享一些加密演算法（DES、HashCode、RSA、AES等）