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

namespace Lskj.QueryEssentialInfo
{
    public static class RsaEntryUtil
    {
        public static byte[] Encrypt(string plainText, string publicKeyXml)
        {
            byte[] dataToEncrypt = Encoding.UTF8.GetBytes(plainText);
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
            {
                rsa.FromXmlString(publicKeyXml);
                // 默认使用PKCS#1 v1.5填充，4.0版本不支持OAEP-SHA256，只能用OAEP-SHA1，且需要指定true
                return rsa.Encrypt(dataToEncrypt, false);
            }
        }
        public static string ToXmlPublicKey(string pubilcKey)
        {
            RsaKeyParameters rsaKeyParameters = PublicKeyFactory.CreateKey(Convert.FromBase64String(pubilcKey)) as RsaKeyParameters;
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
            {
                RSAParameters rsaParams = new RSAParameters
                {
                    Modulus = rsaKeyParameters.Modulus.ToByteArrayUnsigned(),
                    Exponent = rsaKeyParameters.Exponent.ToByteArrayUnsigned()
                };
                rsa.ImportParameters(rsaParams);
                return rsa.ToXmlString(false);
            }
        }
    }
}