一个简单的c#加密,签名,验签,解密算法.(2)

MiniDes.cs

public   class  MiniDes
     ... {
        public MiniDes()
        ...{
            //
            // TODO: Add constructor logic here
            //
        }
        private static string sKey
        ...{
            get
            ...{
                return Key.MiniDesKey;
            }
        }
        //矢量

        private const string sIV = "qcDd6X+aPLa=";

        /**////   <summary> 
        ///   3DES加密 
        ///   </summary> 
        ///   <param   name= "Value "> 待加密字符串 </param> 
        ///   <param   name= "sKey "> 密钥 </param> 
        ///   <param   name= "sIV "> 矢量 </param> 
        ///   <returns> 加密后字符串 </returns> 
        public static string Encrypt(string Value)
        ...{
            try
            ...{
                //构造对称算法 
                SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();

                ICryptoTransform ct;
                MemoryStream ms;
                CryptoStream cs;
                byte[] byt;
                mCSP.Key = Convert.FromBase64String(sKey);
                mCSP.IV = Convert.FromBase64String(sIV);
                //指定加密的运算模式 
                mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;
                //获取或设置加密算法的填充模式 
                mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
                ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);
                byt = Encoding.UTF8.GetBytes(Value);
                ms = new MemoryStream();
                cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
                cs.Write(byt, 0, byt.Length);
                cs.FlushFinalBlock();
                cs.Close();
                return Convert.ToBase64String(ms.ToArray());
            }
            catch
            ...{
                return "";
            }
        }

        /**////   <summary> 
        ///   3DES解密 
        ///   </summary> 
        ///   <param   name= "Value "> 待解密字符串 </param> 
        ///   <param   name= "sKey "> 密钥 </param> 
        ///   <param   name= "sIV "> 矢量 </param> 
        ///   <returns> 解密后字符串 </returns> 
        public static string Decrypt(string Value)
        ...{
            try
            ...{
                //构造对称算法 
                SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();

                ICryptoTransform ct;
                MemoryStream ms;
                CryptoStream cs;
                byte[] byt;
                mCSP.Key = Convert.FromBase64String(sKey);
                mCSP.IV = Convert.FromBase64String(sIV);
                mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;
                mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
                ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);
                byt = Convert.FromBase64String(Value);
                ms = new MemoryStream();
                cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
                cs.Write(byt, 0, byt.Length);
                cs.FlushFinalBlock();
                cs.Close();
                return Encoding.UTF8.GetString(ms.ToArray());
            }
            catch
            ...{
                return "";
            }
        }

    }

 key.cs

public   class  Key
     ... {
        public Key()
        ...{
            //
            // TODO: Add constructor logic here
            //
        }
        
        //des密钥 32位
        public static string MiniDesKey
        ...{
            get
            ...{
                return "qJzGEh6hESZDVgeCnFPGuxzaiB7NLQM2";
            }
        }
    }

CodeSign.cs

public   class  CodeSign
     ... {
        public CodeSign()
        ...{
        }
        //返回原加密字符串
        public static string GetData(string signstr)
        ...{
            try
            ...{
                string _tempsignstr = signstr.Substring(signstr.IndexOf('A') + 1);
                int randomstrlen = int.Parse(signstr.Substring(signstr.IndexOf('A') + 1, signstr.IndexOf('B') - signstr.IndexOf('A') - 1));
                string wholestr = signstr.Substring(signstr.IndexOf('B') + 1);
                string _temp1str = signstr.Substring(signstr.IndexOf('B') + 1, (wholestr.Length - randomstrlen) / 2);
                string _temp2str = signstr.Substring(signstr.IndexOf('B') + 1 + _temp1str.Length + randomstrlen);
                string _tempstr = _temp1str + _temp2str;
                string _temprandom = signstr.Substring(signstr.IndexOf('B') + 1 + _temp1str.Length, randomstrlen);

                byte[] byrandom = Convert.FromBase64String(_temprandom);
                for (int i = 0; i < byrandom.Length; i++)
                ...{
                    byrandom[i] = (byrandom[i] ^= (byte)10);
                }

                byte[] bystr = Convert.FromBase64String(_tempstr);
                for (int i = 0; i < bystr.Length; i++)
                ...{
                    bystr[i] = (bystr[i] ^= byrandom[i]);
                }

                string oldstr = Encoding.UTF8.GetString(bystr);

                return oldstr;
            }
            catch
            ...{
                return "";
            }

        }

        //签名  ascii（A后的数)）+A+（随即数^10.length+B+str^随即数+随即数^10(插入在str^随即数/2处)）
        public static string AddSign(string str)
        ...{
            try
            ...{
                byte[] bystr = Encoding.UTF8.GetBytes(str);
                string randomstr = GetRandomStr(bystr.Length);
                byte[] byrandom = Encoding.UTF8.GetBytes(randomstr);
                for (int i = 0; i < bystr.Length; i++)
                ...{
                    bystr[i] = (bystr[i] ^= byrandom[i]);
                }
                string signstr = Convert.ToBase64String(bystr);
                for (int i = 0; i < byrandom.Length; i++)
                ...{
                    byrandom[i] = (byrandom[i] ^= (byte)10);
                }
                string _temprandom = Convert.ToBase64String(byrandom);
                string _temp1str = signstr.Substring(0, signstr.Length / 2);
                string _temp2str = signstr.Substring(signstr.Length / 2);
                signstr = _temprandom.Length + "B" + _temp1str + _temprandom + _temp2str;
                string _tempASCII = ToASCII(signstr);
                return _tempASCII + "A" + signstr;
            }
            catch
            ...{
                return "";
            }

        }
        //验签
        public static bool CheckSign(string signstr)
        ...{
            try
            ...{
                if (!string.IsNullOrEmpty(signstr))
                ...{
                    string _tempASCII = signstr.Substring(0, signstr.IndexOf('A'));
                    string _tempsignstr = signstr.Substring(signstr.IndexOf('A') + 1);
                    if (int.Parse(_tempASCII) == int.Parse(ToASCII(_tempsignstr)))
                    ...{
                        return true;
                    }
                }
            }
            catch
            ...{
                return false;
            }
            return false;
        }
        //求一个string的ASCII码之和
        public static string ToASCII(string str)
        ...{
            int _tempint = 0;
            byte[] by = Encoding.ASCII.GetBytes(str);
            for (int i = 0; i < by.Length; i++)
            ...{
                _tempint += by[i];
            }
            return _tempint.ToString();
        }
        public static string GetRandomStr(int codeCount)
        ...{
            string allChar = "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";
            string[] allCharArray = allChar.Split(',');
            string randomCode = "";
            int temp = -1;

            Random rand = new Random();
            for (int i = 0; i < codeCount; i++)
            ...{
                if (temp != -1)
                ...{
                    rand = new Random(i * temp * ((int)DateTime.Now.Ticks));//随时间生成
                }
                int t = rand.Next(25);

                //如果重复了则重新生成
                //if (temp == t)
                //{
                //    return GetRandomStr(codeCount);
                //}
                temp = t;
                randomCode += allCharArray[t];
            }
            return randomCode;
        }
    }