using Furion;
using Furion.FriendlyException;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.X509;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Ewide.Core.Util
{
    public static class RSAHandler
    {
        /// <summary>
        /// XML 文件转成PEM 公钥格式
        /// </summary>
        /// <param name="xml"></param>
        /// <param name="saveFile"></param>
        /// <returns></returns>
        public static string Xml2PemPublic(string xml, string saveFile)  
        {
            var rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xml); var p = rsa.ExportParameters(false);
            RsaKeyParameters key = new RsaKeyParameters(false, new BigInteger(1, p.Modulus), new BigInteger(1, p.Exponent)); using (var sw = new StreamWriter(saveFile))
            {
                var pemWriter = new Org.BouncyCastle.OpenSsl.PemWriter(sw);
                pemWriter.WriteObject(key);
            }
            SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(key); byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
            string publicKey = Convert.ToBase64String(serializedPublicBytes);
            return Format(publicKey, 1);
        }
        /// <summary>
        /// 格式化
        /// </summary>
        /// <param name="key"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        public static string Format(string key, int type)
        {
            string result = string.Empty; int length = key.Length / 64; for (int i = 0; i < length; i++)
            {
                int start = i * 64;
                result = result + key.Substring(start, 64) + "\r\n";
            }

            result = result + key.Substring(length * 64); if (type == 1)
            {
                result = result.Insert(0, "-----BEGIN PUBLIC KEY-----\r\n");
                result += "\r\n-----END PUBLIC KEY-----";
            }
            if (type == 2)
            {
                result = result.Insert(0, "-----BEGIN PRIVATE KEY-----\r\n");
                result += "\r\n-----END PRIVATE KEY-----";
            }
            return result;
        }
        /// <summary>
        /// RSA加密  公钥
        /// </summary>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string RSAEncrypt(string content)
        {
            //string publickey = @"<RSAKeyValue><Modulus>tu98wMoo297l+juulU4a3Xx7c2SZ93f0gTPKohE0uz4o8jWN8zXnAAfhf6MMTlkgf+qIwaORLtBQohDcX6Xp02Qe7Cq2LujVR+YJHxy2uo8+KTc5Rj/d0OkTjeCozGaJQH0XrwUO7w+rDnyXzA52IvMZPnUV3KnOj1mPH0IhrOU=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
            string publickey = App.Configuration["RSA:publickey"];
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            byte[] cipherbytes;
            rsa.FromXmlString(publickey);
            cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
            return Convert.ToBase64String(cipherbytes);
        }

        /// <summary>
        /// RSA解密 私钥
        /// </summary>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string RSADecrypt(string content)
        {
            //string privatekey = @"<RSAKeyValue><Modulus>tu98wMoo297l+juulU4a3Xx7c2SZ93f0gTPKohE0uz4o8jWN8zXnAAfhf6MMTlkgf+qIwaORLtBQohDcX6Xp02Qe7Cq2LujVR+YJHxy2uo8+KTc5Rj/d0OkTjeCozGaJQH0XrwUO7w+rDnyXzA52IvMZPnUV3KnOj1mPH0IhrOU=</Modulus><Exponent>AQAB</Exponent><P>7yKLJO9dobe7pNW3ob+Vse8kvlA+PObDrZNqFxUTLyXoAeHDnwz3BjJ2EVUPNJHV5F1/KPLTvADIjDrdB1qcbw==</P><Q>w9ZK0SHBddtE91skFFS72YDmxzmXumSuUyREStVul9ke0oU2HjcZA915bmR0Zrh1RzO3y1w9zXVn+GdZGjyd6w==</Q><DP>ncA67E2fhcwv0+hMcD5zYOLyaT2EISbWFQ43ISz879BgwcUOCEFEP+lP69Uh57sAz9pBxWCS/uXBZoh6QJysrw==</DP><DQ>vbC8F4YS1g3l55Koh+jra+qnnyHyDeGn2XCvlazWys7MRC40FWBZIp1MGdnDxhu1vZoi1SAr3O90HfA9JmTAsQ==</DQ><InverseQ>00v2vMCcgXy78eMby7R6zfZzacVnVFO2WeyxYF7pjrXYYP+C4JSJkWpy6JGLWbgZrK8HAuRguJmdRi8K2KiYWg==</InverseQ><D>rV3nb9nmwQDMGMrI2GyN30uivygfFj0TdgK8Tb1aqPzu1yRT46M4yXmuhkTiW7nxp+iANGssIx5+3Ch4gRj+r6BgBPldWNErK95a2v2Ae1+EzfVf21ybguBYeUVnV9c8qwoodZSVOajZapOgoS6s5TEOxHWRcF22AiFuaD1Tl90=</D></RSAKeyValue>";
            string privatekey = App.Configuration["RSA:privatekey"];
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            byte[] cipherbytes;
            try
            {   //很有可能是报文被修改 情况很小
                rsa.FromXmlString(privatekey);
                cipherbytes = rsa.Decrypt(Convert.FromBase64String(content), false);
                return Encoding.UTF8.GetString(cipherbytes);
            }
            catch
            {
                throw Oops.Oh(ErrorCode.D1000);
            }
        }
    }
}