C# 加密解密类

布满荆棘的人生 2022-05-11 05:24 213阅读 0赞

MD5无法通过密文解成明文  
RSA无法加密长文本  
DES两者兼有

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Security.Cryptography;
    using System.IO;
    using System.Runtime.Serialization;
    using System.Runtime.Serialization.Formatters.Binary;
    namespace SyncAdOfficePwd
    {
        class CryptoClass
        {
            public static System.Security.SecureString key = new System.Security.SecureString();
            public static void DESSetKey(){
                key.AppendChar('d');
                key.AppendChar('e');
                key.AppendChar('s');
                key.AppendChar('h');
                key.AppendChar('s');
                key.AppendChar('0');
                key.AppendChar('0');
                key.AppendChar('8');
            }
            public static string fromSecurityString(System.Security.SecureString ss)
            {
                return System.Runtime.InteropServices.Marshal.PtrToStringBSTR(System.Runtime.InteropServices.Marshal.SecureStringToBSTR(CryptoClass.key));
            }
            //加密
            public static string RSAEncryption(string express)
            {
                CspParameters param = new CspParameters();
                param.KeyContainerName = "rsa_hs";//密匙容器的名称，保持加密解密一致才能解密成功
                using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param))
                {
                    byte[] plaindata = Encoding.Default.GetBytes(express);//将要加密的字符串转换为字节数组
                    byte[] encryptdata = rsa.Encrypt(plaindata, false);//将加密后的字节数据转换为新的加密字节数组
                    return Convert.ToBase64String(encryptdata);//将加密后的字节数组转换为字符串
                }
            }
            //加密对象
            public static string RSAEncryption(object express)
            {
                CspParameters param = new CspParameters();
                param.KeyContainerName = "rsa_hs";//密匙容器的名称，保持加密解密一致才能解密成功
                using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param))
                {
                    MemoryStream stream = new MemoryStream();
                    IFormatter formatter = new BinaryFormatter();
                    formatter.Serialize(stream,express);
                    stream.Position=0;
                    byte[] data=new byte[stream.Length];
                    stream.Read(data,0,data.Length);
                    //byte[] plaindata = Encoding.Default.GetBytes(express);//将要加密的字符串转换为字节数组
                    //byte[] encryptdata = rsa.Encrypt(plaindata, false);//将加密后的字节数据转换为新的加密字节数组
                    byte[] encryptdata = rsa.Encrypt(data, false);
                    return Convert.ToBase64String(encryptdata);//将加密后的字节数组转换为字符串
                }
            }
            //解密
            public static string RSADecrypt(string ciphertext)
            {
                CspParameters param = new CspParameters();
                param.KeyContainerName = "rsa_hs";
                using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param))
                {
                    byte[] encryptdata = Convert.FromBase64String(ciphertext);
                    byte[] decryptdata = rsa.Decrypt(encryptdata, false);
                    return Encoding.Default.GetString(decryptdata);
                }
            }
            //解密对象
            public static object RSADecryptObj(string ciphertext)
            {
                CspParameters param = new CspParameters();
                param.KeyContainerName = "rsa_hs";
                using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param))
                {
                    byte[] encryptdata = Convert.FromBase64String(ciphertext);
                    byte[] decryptdata = rsa.Decrypt(encryptdata, false);
                    //return Encoding.Default.GetString(decryptdata);
                    MemoryStream stream = new MemoryStream();
                    IFormatter formatter = new BinaryFormatter();
                    stream.Write(decryptdata, 0, decryptdata.Length);
                    stream.Position = 0;
                    object obj=formatter.Deserialize(stream);
                    return obj;
                }
            }
            // DES字符串加密
            public static string DESEncrypt(string _strQ, string strKey)
            {
                byte[] buffer = Encoding.UTF8.GetBytes(_strQ);
                MemoryStream ms = new MemoryStream();
                DESCryptoServiceProvider tdes = new DESCryptoServiceProvider();
                CryptoStream encStream = new CryptoStream(ms, tdes.CreateEncryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strKey)), CryptoStreamMode.Write);
                encStream.Write(buffer, 0, buffer.Length);
                encStream.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray()).Replace("+", "%");
            }
    
            // DES字符串解密
            public static string DESDecrypt(string _strQ, string strKey)
            {
                _strQ = _strQ.Replace("%", "+");
                byte[] buffer = Convert.FromBase64String(_strQ);
                MemoryStream ms = new MemoryStream();
                DESCryptoServiceProvider tdes = new DESCryptoServiceProvider();
                CryptoStream encStream = new CryptoStream(ms, tdes.CreateDecryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strKey)), CryptoStreamMode.Write);
                encStream.Write(buffer, 0, buffer.Length);
                encStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(ms.ToArray());
            }
    
    
            /// <summary>
            /// MD5
            /// </summary>
            /// <param name="express"></param>
            /// <returns></returns>
            public static string MD5(string express)
            {
                MD5 md5 = new MD5CryptoServiceProvider();
                byte[] palindata = Encoding.Default.GetBytes(express);//将要加密的字符串转换为字节数组
                byte[] encryptdata = md5.ComputeHash(palindata);//将字符串加密后也转换为字符数组
                return Convert.ToBase64String(encryptdata);//将加密后的字节数组转换为加密字符串
            }
    
        }
    }