using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace RuralPower
{
    public static class RSAHelper
    {
        private static string publicKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2TEstfATFdDWntbJTCPer9FOdwTRe58Vjy9T238/uUQYyoTHClfQCCKnys4elHCE0D0B7D/k2hK9U+xu1hWv1v4lH+n+t5duNVGq3sa5+pOq8j1ztec3W+wlcFgplYJq78XBYGYDbyfhmu5KeDeImsiccwnq3WvigfZYPbTvGv2YsqXDpTp+/s0hQsrYeATr2MuhiBhQGynLUvKCEcWvd/GNByMxJdJwl0k+IZW+DiCDmNX9Qwj23HF7U+Om7jEZC+Li/j2MHA5C4eEtVzgVC4VZETVOIcLv/UDufnAlneTJK2Exo+4YFEg9S1shpqUz9shSBl8JF9DM2a3KKmxc4wIDAQAB";

        // 加密数据
        public static string EncryptData(string content)
        {
            var public_key = ToXmlPublicKey(publicKey);
            var data = Encoding.UTF8.GetBytes(content);
            string encryptedContent = string.Empty;
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
            {
                rsa.FromXmlString(public_key);
                byte[] encryptedData = rsa.Encrypt(data, false);
                encryptedContent = Convert.ToBase64String(encryptedData);
            }
            return encryptedContent;
        }

        /// <summary>
        /// base64 private key string -> xml private key
        /// </summary>
        /// <param name="privateKey"></param>
        /// <returns></returns>
        public static string ToXmlPrivateKey(string privateKey)
        {
            RsaPrivateCrtKeyParameters privateKeyParams =
                PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey)) as RsaPrivateCrtKeyParameters;
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
            {
                RSAParameters rsaParams = new RSAParameters()
                {
                    Modulus = privateKeyParams.Modulus.ToByteArrayUnsigned(),
                    Exponent = privateKeyParams.PublicExponent.ToByteArrayUnsigned(),
                    D = privateKeyParams.Exponent.ToByteArrayUnsigned(),
                    DP = privateKeyParams.DP.ToByteArrayUnsigned(),
                    DQ = privateKeyParams.DQ.ToByteArrayUnsigned(),
                    P = privateKeyParams.P.ToByteArrayUnsigned(),
                    Q = privateKeyParams.Q.ToByteArrayUnsigned(),
                    InverseQ = privateKeyParams.QInv.ToByteArrayUnsigned()
                };
                rsa.ImportParameters(rsaParams);
                return rsa.ToXmlString(true);
            }
        }

        /// <summary>
        /// base64 public key string -> xml public key
        /// </summary>
        /// <param name="pubilcKey"></param>
        /// <returns></returns>
        public static string ToXmlPublicKey(string pubilcKey)
        {
            RsaKeyParameters p =
                PublicKeyFactory.CreateKey(Convert.FromBase64String(pubilcKey)) as RsaKeyParameters;
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
            {
                RSAParameters rsaParams = new RSAParameters
                {
                    Modulus = p.Modulus.ToByteArrayUnsigned(),
                    Exponent = p.Exponent.ToByteArrayUnsigned()
                };
                rsa.ImportParameters(rsaParams);
                return rsa.ToXmlString(false);
            }
        }
    }
}