RSA加密解密

相比较于Des 对称可逆加密性能要差 加密解密速度不快 安全性好 公开加密key，保证数据的安全传递 公开解密key，保证数据的不可抵赖 公钥就是公开的key 私钥就是不公开的key C#内置实现了公钥加密 私钥解密；想换需要用第三方的DLL-BouncyCastle   使用方法

KeyValuePair<string, string> encryptDecrypt = RsaEncrypt.GetKeyPair();
   string rsaEn1 = RsaEncrypt.Encrypt("net", encryptDecrypt.Key);
   string rsaDe1 = RsaEncrypt.Decrypt(rsaEn1, encryptDecrypt.Value);

相比较于前面这一种Des 对称可逆加密性能要差
加密解密速度不快  安全性好  
公开加密key，保证数据的安全传递
公开解密key，保证数据的不可抵赖
公钥就是公开的key  私钥就是不公开的key
C#内置实现了公钥加密  私钥解密；想换需要用第三方的DLL-BouncyCastle

使用方法
   KeyValuePair<string, string> encryptDecrypt = RsaEncrypt.GetKeyPair();
   string rsaEn1 = RsaEncrypt.Encrypt("net", encryptDecrypt.Key);
   string rsaDe1 = RsaEncrypt.Decrypt(rsaEn1, encryptDecrypt.Value);

    /// <summary>
    /// RSA ECC
    /// 可逆非对称加密 
    /// 非对称加密算法的优点是密钥管理很方便，缺点是速度慢。
    /// </summary>
    public class RsaEncrypt
    {
        /// <summary>
        /// 获取加密/解密对
        /// 给你一个，是无法推算出另外一个的
        /// 
        /// Encrypt   Decrypt
        /// </summary>
        /// <returns>Encrypt   Decrypt</returns>
        public static KeyValuePair<string, string> GetKeyPair()
        {
            RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
            string publicKey = RSA.ToXmlString(false);
            string privateKey = RSA.ToXmlString(true);
            return new KeyValuePair<string, string>(publicKey, privateKey);
        }

        /// <summary>
        /// 加密：内容+加密key
        /// 
        /// </summary>
        /// <param name="content"></param>
        /// <param name="encryptKey">加密key</param>
        /// <returns></returns>
        public static string Encrypt(string content, string encryptKey)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(encryptKey);
            UnicodeEncoding ByteConverter = new UnicodeEncoding();
            byte[] DataToEncrypt = ByteConverter.GetBytes(content);
            byte[] resultBytes = rsa.Encrypt(DataToEncrypt, false);
            return Convert.ToBase64String(resultBytes);
        }

        /// <summary>
        /// 解密  内容+解密key
        /// </summary>
        /// <param name="content"></param>
        /// <param name="decryptKey">解密key</param>
        /// <returns></returns>
        public static string Decrypt(string content, string decryptKey)
        {
            byte[] dataToDecrypt = Convert.FromBase64String(content);
            RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
            RSA.FromXmlString(decryptKey);
            byte[] resultBytes = RSA.Decrypt(dataToDecrypt, false);
            UnicodeEncoding ByteConverter = new UnicodeEncoding();
            return ByteConverter.GetString(resultBytes);
        }


        /// <summary>
        /// 可以合并在一起的，每次产生一组新的密钥
        /// </summary>
        /// <param name="content"></param>
        /// <param name="encryptKey">加密key</param>
        /// <param name="decryptKey">解密key</param>
        /// <returns>加密后结果</returns>
        private static string Encrypt(string content, out string publicKey, out string privateKey)
        {
            RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider();
            publicKey = rsaProvider.ToXmlString(false);
            privateKey = rsaProvider.ToXmlString(true);

            UnicodeEncoding ByteConverter = new UnicodeEncoding();
            byte[] DataToEncrypt = ByteConverter.GetBytes(content);
            byte[] resultBytes = rsaProvider.Encrypt(DataToEncrypt, false);
            return Convert.ToBase64String(resultBytes);
        }
    }