OL.FrameCore.Infrastructure/Security/RSAUtility.cs

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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Encodings;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.OpenSsl;
using Org.BouncyCastle.Security;

namespace OL.FrameCore.Infrastructure.Security
{
    /// <summary>
    /// RSA非对称加密
    /// </summary>
    public class RSAUtility
    {
        /*
         * 需在nuget安装bouncycastle.netcore类库
         * https://www.cnblogs.com/myhalo/p/9334282.html
         */

        /// <summary>
        /// 生成PEM格式的公钥和密钥
        /// </summary>
        /// <param name="strength">长度</param>
        /// <returns>Item1:公钥；Item2:私钥；</returns>
        public static (string, string) CreateKeyPair(int strength = 1024)
        {
            RsaKeyPairGenerator r = new RsaKeyPairGenerator();
            r.Init(new KeyGenerationParameters(new SecureRandom(), strength));
            AsymmetricCipherKeyPair keys = r.GenerateKeyPair();

            TextWriter privateTextWriter = new StringWriter();
            PemWriter privatePemWriter = new PemWriter(privateTextWriter);
            privatePemWriter.WriteObject(keys.Private);
            privatePemWriter.Writer.Flush();

            TextWriter publicTextWriter = new StringWriter();
            PemWriter publicPemWriter = new PemWriter(publicTextWriter);
            publicPemWriter.WriteObject(keys.Public);
            publicPemWriter.Writer.Flush();


            return (publicTextWriter.ToString(), privateTextWriter.ToString());
        }

        /// <summary>
        /// RSA解密
        /// </summary>
        /// <param name="privateKey">私钥</param>
        /// <param name="decryptstring">待解密的字符串(Base64)</param>
        /// <returns>解密后的字符串</returns>
        public static string Decrypt(string privateKey, string decryptstring)
        {
            using (TextReader reader = new StringReader(privateKey))
            {
                dynamic key = new PemReader(reader).ReadObject();
                var rsaDecrypt = new Pkcs1Encoding(new RsaEngine());