NetCore 生成RSA公私钥对，公钥加密私钥解密，私钥加密公钥解密

傷城~ 2022-05-30 07:08 648阅读 0赞

# [NetCore 生成RSA公私钥对，公钥加密私钥解密，私钥加密公钥解密][NetCore _RSA] #

using Newtonsoft.Json;
    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.Pkcs;
    using Org.BouncyCastle.Security;
    using Org.BouncyCastle.X509;
    using System;
    using System.IO;
    using System.Text;
    
    namespace ConsoleAppTest
    {
        class Program
        {
            //自己生成
            static string _publicKeyString = @"-----BEGIN PUBLIC KEY-----
                                                MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAmu5B+WIU9ZK+uy11qmdj
                                                KygwcH6r8YOui2jc87pWShKAEnEE2Q81twgQ4KGFylodpNsXs+EGeQA8HUiDKK11
                                                Pm6AMzrqHQ8rtNNWbQA6Ca+BJJHEoyrizaHTGLWU7oHe9TcRQ8Iq5vihF74x1jD2
                                                BHXpgR6KUhx9DUMFgdwpLXhZ2EgG85eOuajcHl+tLN52bEpGwSHyL5iWuX2U5qfN
                                                Ln3h/lCmdktPwCjVVyaoLALxP0oDtalRwLKRJuD91p6YxrAeN3eRkGWoYXH5bSrS
                                                BR+5id5yBplxayVrozJXFpOFySTrCHD2snnfjmn39dKsRjwRjKG/zKUPO54GPovv
                                                rODK32c1xiKpQQ7XAzyXPNij3MWPJFu6z24eNdILm4wF1jFWQlrsca0znpjoAVFY
                                                e1yp1lXAtYlxgNURMQ2RwvBtnT3BUhUP382GYd0XPdV1xodOaJVf8ce3YImrGaAY
                                                jPjbTPTbTyzwcHyc1LHwYw4W7aYiTyX8p5+7PkdkRr8uiKA9iFhH6iq+7MPv5O0F
                                                NGSktGZkyFSKg9vazQmESlUC+blC2yQRBJsqV84weMKGCURg3jxetTfENHJ8N+H9
                                                pnacvRjl5O5cZjECOi4XrGAUd4bvqKBfZ1OnB1htWGEjPyGhKzmAG8vzf0GVtAK8
                                                8qhuYM7FceTYJsqUnzFnEHUCAwEAAQ==
                                                -----END PUBLIC KEY-----";
            static string _privateKeyString = @"-----BEGIN RSA PRIVATE KEY-----
                                                MIIJKAIBAAKCAgEAmu5B+WIU9ZK+uy11qmdjKygwcH6r8YOui2jc87pWShKAEnEE
                                                2Q81twgQ4KGFylodpNsXs+EGeQA8HUiDKK11Pm6AMzrqHQ8rtNNWbQA6Ca+BJJHE
                                                oyrizaHTGLWU7oHe9TcRQ8Iq5vihF74x1jD2BHXpgR6KUhx9DUMFgdwpLXhZ2EgG
                                                85eOuajcHl+tLN52bEpGwSHyL5iWuX2U5qfNLn3h/lCmdktPwCjVVyaoLALxP0oD
                                                talRwLKRJuD91p6YxrAeN3eRkGWoYXH5bSrSBR+5id5yBplxayVrozJXFpOFySTr
                                                CHD2snnfjmn39dKsRjwRjKG/zKUPO54GPovvrODK32c1xiKpQQ7XAzyXPNij3MWP
                                                JFu6z24eNdILm4wF1jFWQlrsca0znpjoAVFYe1yp1lXAtYlxgNURMQ2RwvBtnT3B
                                                UhUP382GYd0XPdV1xodOaJVf8ce3YImrGaAYjPjbTPTbTyzwcHyc1LHwYw4W7aYi
                                                TyX8p5+7PkdkRr8uiKA9iFhH6iq+7MPv5O0FNGSktGZkyFSKg9vazQmESlUC+blC
                                                2yQRBJsqV84weMKGCURg3jxetTfENHJ8N+H9pnacvRjl5O5cZjECOi4XrGAUd4bv
                                                qKBfZ1OnB1htWGEjPyGhKzmAG8vzf0GVtAK88qhuYM7FceTYJsqUnzFnEHUCAwEA
                                                AQKCAgAJNMGmVjHtIrZjLHEaulB9+sIgGSLR89NuFMHWWLryZVWHYwBY/oqgUOIh
                                                2u82hjLPPjaTGXq3O3CXA91JUD9QgaPsB2LsbZ+Y+9rdmL8aHrvjhqbi1DRMaEKB
                                                LB8Iqh5rv0UvG81NUrZN0R8ofVnNC42fvscU2H0Eyff8jq7CtS1PiP4iwN16AkLs
                                                Kh7B9Qkf56z7Im9/7Qb9yCzOJOfwDIpegH/XtSNsxXBh4JnrHZSkwFrmk0RYmTO/
                                                Vey3cU6eNc5h2ODFLgk6mxlpZ3s50zgE7Xskkb8X0Q4rkRz0KjlvqZousvmxwsSq
                                                M3lIuedDOCQJ0X2yZRd54Sq5UjrgWKWc7LT9qeiUYmdx3LM6LbG+DzGLHgQ7SkpT
                                                ZmOKmXOWtjQ/4LOF1vDS3vK7aGU6QjebswKCZv/b9hDiA2AWtoVM3rOlPc1ypif+
                                                Uoq1PLxnjxIfptdwlZf9n9ol6+5K2E2PeV9d3nJ+idmoi7EnGNUB/kgud3Rv5uZ7
                                                Ftf/cqHgUiwYuMR/n40xR4tx6w8SSIL31c83OZQbOsh/7fN89FWxqYeDzAir4Yj7
                                                ozAUteyAnBn70BO0SzsNnt6jGwDcnyQuQtAnnoNgbEVzD6AOaTvmuKsx/RvDp+nv
                                                OoeGVRSZusJYL/DexH8Rp2js+ai3wI7hnf4YBgG/jQTf3L9egQKCAQEA7Vu1mWOp
                                                Nq96dCSIRBbu/3OhBhFDKuatxB1ZKoccADCaz4NqaWCUZr2PutSgDqc8qqIldnwr
                                                0Cxojj658MJmMehECOsDiEBRlCsZX3ghstVzdbnuhGEsC4RBaaIY9Ik0Jj0b40Fa
                                                GDEAULk0cOucA3bPhyPiaGuo9dHQbREIGKqmGMxgSSm6CeuQcon253U5jNfrY3se
                                                LlLcBYKAAJMLW9c8niTZPXZA62nyGVH4aaLiyB+NodRgSO/zNwR2vMTxdJbCBQJ7
                                                YJhiuGqYGSLnIf7MUBg5X0jL0oShNGngcCtLSwXwP3I0+AnMaKQo+93+gILy4J2Q
                                                yzkK0guR7E6x9QKCAQEApxlFn3smcad8SeI0fXd8nBLhk4GbNXCy+fMTy11zXmVJ
                                                M2HeE6u+nGLoaMrdL0IFyVOTDV6Cn5k1iPLFMTcGdLqrS+j/ICZh0+F0qg7x1inp
                                                O3Fsgp4C0eebcigk9//GCkFAvDfgfAPB3G6R6qA+xIq7P6M/D2Iy4wNQaeyK+ubC
                                                AIUydF9sdLgn/cwwBbo6E9GPr6LHy1AbNvK8/WkogKnXONocjejiE6Y45RcK7Ci/
                                                iG1MlvTeXMT7A0ccKrJDxipfhpLfENS7TClvOoi6T5mGj4tAGaU1YqBC6FLB8Fk1
                                                NR3BsByc/xShzmdelRlE5ZkD76dkt58KK9Dcpg9UgQKCAQBWFOSPdK1xv8JRTM5+
                                                ozKaQn0rjicl7/MlJN+ppMZq6zW5/JcjEHvBpw3xXBuQNOazm4qqpe3d2b0xmV4m
                                                Ctq1Tt8dvN3TFECB0/+nuBHAodj14TC3oeYvZw+yF6+lP/1BwPfUO2dJTrwmioSS
                                                T2CNgRFSmZkK9cCZJjbI11xwVbNXWwewgQmPf3crkw2Qc9sjUUt1ELmpYzOYa/Ow
                                                QaPk8vJxCDwhJjn1Jr8+n5PP+9rzaT4casFgsmUqltvZKjPHbMWAu52zMpDbAQ2Y
                                                UCgzFA1VHvPvsp75AlDUiXF0PL9ZvhWbbPf43NTdPmv+rEwYn2UmQP66NT3PX5LU
                                                eNXhAoIBAQCfb9miphq0bx6EULXM0WmwccOSvyOdBf9/xpOog25FL1d9E3CWTFT/
                                                WtBuzMHnCZQD2R6Crx7rsYAHP70vjFU4o7Q2JgboYjcNuB1c9g2CT1MfSMZEiwgd
                                                yGPltLAxgXcw6boe3SHwspUTAt1vhZ7eYZDw046j2wq62Lqtlum1JOEPJghSSYpu
                                                hBiEbYOUs3Ae4OG8sBD6yWBuOYZiNShUO7oDoPmF3iN4pC29SRM+6lJ2lfNyRgq1
                                                ca4gHoWdp6JLPrsO6Ky2noRn01EyBKvgr5hY9oEe9yfNByVQD0bFUhkWqWHZ7DNQ
                                                oBsTmkYA9a9rc2jyDkJngfRugkdGm3IBAoIBAHrY2yYT59hFXq99HvH2MB5QcMlv
                                                TtOqjs1tmE3Mpivyg9YNvDeDTv1qOZn8xUd959nJrHSqN8me86P12DTQPCzdhIRT
                                                MM/bNjr6/bHhKG3nF/Xkln4hK5YtSH1PjCml+VEoUPFwgsWvn2dhYwsQ1wiarwkL
                                                FzIijlLmfuLGvS8kTPMRXert4UWZcXRD8B/MypYt3uMjLbeXIAHuOG9wjuuV/Yla
                                                XJBgOImw0Jhib7NqS0BKv3SvhHA7olduqOv9z0yGHXcHZKxB6O7+YKATc1nszjwc
                                                cAEm30c3/mhCHPuathM0laKV36Z4hp2y8ginJdK7gZQSkyzjRDI2yx5cq6U=
                                                -----END RSA PRIVATE KEY-----";
    
            //网站生成
            static string _publicKeyStringWeb = @"-----BEGIN PUBLIC KEY-----
                                                MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCPNZe67AfIs2rFWLp5HZ6y8VG/
                                                ybhhE0Q9WmkdnPXFGSN9j3M8Uglmh78MCfawm9goHnvMl5c8ta2dDnKZi+WWuZ6D
                                                K+OOS/kBgR9cLMci+9bI7NA8/spxbVBbKDlgyRWPle65Nm7foX3OamNJe6uoMaLL
                                                Y/jWSdwxPsp1jp8GJwIDAQAB
                                                -----END PUBLIC KEY-----";
            static string _privateKeyStringWeb = @"-----BEGIN RSA PRIVATE KEY-----
                                                Proc-Type: 4,ENCRYPTED
                                                DEK-Info: DES-EDE3-CBC,EF30E5A772A723B5
                                                8DS2obJNGC9M2GJuxID6mZV5p4k+oxgv1fEILJ+CwpzJ0lAGspDiqLgxSKmETZiE
                                                ct9zCkEEABTarhBspC1i4O4np4nO+z40iTvDwu88bDMvWvEV2EYYaJn9ZelJZ51y
                                                KHEJw4fncvZN8ULNBZ7Fnn9Y6+pLW6IJrSHTL7TrN1gi257LAX5xUgHvNqet4XMl
                                                UKoX0DmDZkCFdnn3a/DQUA4au8rrotsU/ihBDFMMGljA/QKPApnuy07+KyXtaDx6
                                                YlBMifqbsuYLOvNMT9aqbAPp5OFdykTnfPRPnx9xHuTqXE8NfInYvSMkcC8lpUrt
                                                M8wsCVaRukliBOSyNYxyqMZwBJMXrY9+lyZMi6/g6450HJ0NBOC8/mc5Gj8nD6L6
                                                tjkkFyS/t4aU7lZWqh4oMRHPwDQqrgSZB13lBveXVSoTpVOzvgV2vEC6p9s+IGIC
                                                +WpNRq55zWtj8EsZly/p91NlrHujDQsEyrkUDUE3xjon66vQow9jRwYngA0VWeL8
                                                dO9XN/srJ4jQB4I/wx9X7MfDJzVF/RrHT42QVfeqsPx071TJAd3+GqJS0+B1FaS8
                                                PoTCY4yor2ViTOS/NfZEs0SyC1U9t41FTIEnfnZVqEF54Hy3l8kCrTjVc2Vm2HAG
                                                /DAzGgbdOV8KJKdWFpc5+aQde5j2xxd4LwF8kKTSLaRonVMhBJ4LBLPn9NsdU7vw
                                                MyFyLnHb4qsilAC3P2Ui8MJP2kJsqO1ho3V9ITG8IzxiZmpLLL1D8GAJoaDtDxhu
                                                MtQZQpgpuW7CaVItZrxrmBbdMXpGW/GkOhySZVI0au04GfPHQtssAQ==
                                                -----END RSA PRIVATE KEY-----";
    
            static string _encryptedWithPublicStr = @"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";
    
            static string _encryptedWithPrivateStr = @"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";
    
            static string _encryptedWithPublicWebStr = @"KRC9OJ3R981IsvBJ33Z9eDJHgg5+EOcnh95yZA1HDPeOnn7+s7n7TH4yyIOVAS677bESftzcNfhyCCrDVb7GkRBTu3UgMlkl/KlkC4a8yS2skks5TwYkjPmr2I31PCZzg9JuH0eo3S4oXzqg9NVhgW37kUgRjjbH489XFYeUQEM=";
    
            static string _encryptedWithPrivateWebStr = @"i8lGOft4QH781r5+GUuzp3zEjmmpyw3N7qjj6wKH6LRjxzzCwxJqyewztmosrO9aJt/0LEew5wMSt/xWjrHNiaiAdxnI0UX7i7TZWNASXe1Sie/+36egYfu5x4BctIh2NPP3c6HixVJzQ2I5vtuKK2UPEw8yu5kH3p7+Ifp7CbU=";
    
            static void Main(string[] args)
            {
    
                Console.WriteLine("Hello World!");
    
                //var jsonStr = JsonConvert.SerializeObject(new Test { Name = "塞尔达荒野之息" });
                //var jsonByte = Convert.ToByte(jsonStr);
                //Console.WriteLine(jsonStr);
    
                //GenRSAKeyPair("xjl");
                //RsaEncryptWithPublic("yahaha");
                //RsaEncryptWithPrivate("link");
    
                string encryptedTxt = RsaEncryptWithPublic(new Test { Name = "喷射战士2haha" });
                //RsaDecryptWithPrivate(_encryptedWithPublicStr);
                RsaDecryptWithPrivate(encryptedTxt);
    
                //RsaEncryptWithPrivate(new Test { Name = "odessey" });
                //RsaDecryptWithPublic(_encryptedWithPrivateStr);
    
                Console.ReadLine();
            }
    
            public static void GenRSAKeyPair(string name)
            {
                var generator = new RsaKeyPairGenerator();
                var seed = Encoding.UTF8.GetBytes(name);
                var secureRandom = new SecureRandom();
                secureRandom.SetSeed(seed);
                generator.Init(new KeyGenerationParameters(secureRandom, 4096));
                var pair = generator.GenerateKeyPair();
    
                //第一种方案
                //var privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(pair.Private);
                //var serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetDerEncoded();
                //var serializedPrivate = Convert.ToBase64String(serializedPrivateBytes);
                //Console.WriteLine("Private Key：" + serializedPrivate);
    
                //var publickKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pair.Public);
                //var serializedPublicBytes = publickKeyInfo.ToAsn1Object().GetDerEncoded();
                //var serializedPublic = Convert.ToBase64String(serializedPublicBytes);
                //Console.WriteLine("Public Key：" + serializedPublic);
    
                //第二种方案
                var twPrivate = new StringWriter();
                PemWriter pwPrivate = new PemWriter(twPrivate);
                pwPrivate.WriteObject(pair.Private);
                pwPrivate.Writer.Flush();
                var privateKey = twPrivate.ToString();
                Console.WriteLine("Private Key：" + privateKey);
    
                var twPublic = new StringWriter();
                PemWriter pwPublic = new PemWriter(twPublic);
                pwPublic.WriteObject(pair.Public);
                pwPublic.Writer.Flush();
                var publicKey = twPublic.ToString();
                Console.WriteLine("Public Key：" + publicKey);
            }
    
            /// <summary>
            /// 公钥加密
            /// </summary>
            /// <param name="dataToEncrypt">待加密文本</param>
            //public static void RsaEncryptWithPublic(string dataToEncrypt)
            public static string RsaEncryptWithPublic(Test dataToEncrypt)
            {
                var bytesToEncrypt = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(dataToEncrypt));
    
                var encryptEngine = new Pkcs1Encoding(new RsaEngine());
                using (var txtReader = new StringReader(_publicKeyString))
                {
                    var keyParameter = (AsymmetricKeyParameter)new PemReader(txtReader).ReadObject();
                    encryptEngine.Init(true, keyParameter);
                }
                var encryptedText = Convert.ToBase64String(encryptEngine.ProcessBlock(bytesToEncrypt, 0, bytesToEncrypt.Length));
    
                // 获取publickKey对应的keyParameter的第一种方法
                //var stringReader = new StringReader(_publicKeyString);
                //var pemReader = new Org.BouncyCastle.OpenSsl.PemReader(stringReader);
                //var keyParameter = (AsymmetricKeyParameter)pemReader.ReadObject();
    
                // 获取publickKey对应的keyparameter的第二种方法
                //var publicKey = Convert.FromBase64String(_publicKeyString);
                //var keyParameter = PublicKeyFactory.CreateKey(publicKey);
    
                //用公钥加密的第一种方法
                //var engine = new RsaEngine();
                //engine.Init(true, keyParamter);
                //var blockSize = engine.GetInputBlockSize();
                //return engine.ProcessBlock(data, 0, blockSize);
    
                //用公钥加密的第二种方法
                //IBufferedCipher cipher = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding");
                //cipher.Init(true, keyParameter);
                //var encryptedText = Convert.ToBase64String(cipher.DoFinal(bytesToEncrypt));
                Console.WriteLine("利用公钥加密后的数据：" + encryptedText);
                return encryptedText;
            }
    
            /// <summary>
            /// 私钥加密
            /// </summary>
            /// <param name="dataToEncrypt">待加密文本</param>
            //public static void RsaEncryptWithPrivate(string dataToEncrypt)
            public static void RsaEncryptWithPrivate(Test dataToEncrypt)
            {
                var bytesToEncrypt = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(dataToEncrypt));
                var encryptEngine = new Pkcs1Encoding(new RsaEngine());
                using (var txtReader = new StringReader(_privateKeyString))
                {
                    var keyPair = (AsymmetricCipherKeyPair)new PemReader(txtReader,new PasswordFinder("xjl")).ReadObject();
                    encryptEngine.Init(true, keyPair.Private);
                }
                var encryptedText = Convert.ToBase64String(encryptEngine.ProcessBlock(bytesToEncrypt, 0, bytesToEncrypt.Length));
                Console.WriteLine("利用私钥加密后的数据：" + encryptedText);
            }
    
            public class Test
            {
                public string Name { get; set; }
            }
    
            /// <summary>
            /// 私钥解密
            /// </summary>
            /// <param name="dataToDecrypt">待解密的数据</param>
            public static void RsaDecryptWithPrivate(string dataToDecrypt)
            {
                var bytesToDecrypt = Convert.FromBase64String(dataToDecrypt);
    
                // 获取privatekey对应的keyparameter的第一种方法
                var stringReader = new StringReader(_privateKeyString);
                //var pemReader = new Org.BouncyCastle.Utilities.IO.Pem.PemReader(stringReader);
                var pemReader = new PemReader(stringReader, new PasswordFinder("xjl"));
                var keyPair = (AsymmetricCipherKeyPair)pemReader.ReadObject();
                var keyParameter = keyPair.Private;
    
                // 获取privatekey对应的keyparameter的第二种方法
                //var publicKey = Convert.FromBase64String(_publicKeyString);
                //var keyParameter = PublicKeyFactory.CreateKey(publicKey);
    
                // 用私钥解密的第一种方法
                //var engine = new RsaEngine();
                //engine.Init(false, keyParameter);
                //var blockSize = engine.GetInputBlockSize();
                //engine.ProcessBlock(dataToDecrypt, 0, blockSize);
    
                // 用私钥解密的第二种方法
                IBufferedCipher cipher = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding");
                cipher.Init(false, keyParameter);
                var decipheredBytes = cipher.DoFinal(bytesToDecrypt);
    
                var decipheredText = Encoding.UTF8.GetString(decipheredBytes);
    
                Console.WriteLine("用私钥解密后的数据：" + decipheredText);
            }
    
            /// <summary>
            /// 公钥解密
            /// </summary>
            /// <param name="dataToDecrypt">待解密的数据</param>
            public static void RsaDecryptWithPublic(string dataToDecrypt)
            {
                var bytesToDecrypt = Convert.FromBase64String(dataToDecrypt);
    
                // 获取privatekey对应的keyparameter的第一种方法
                var stringReader = new StringReader(_publicKeyString);
                //var pemReader = new Org.BouncyCastle.Utilities.IO.Pem.PemReader(stringReader);
                var pemReader = new PemReader(stringReader);
                var keyParameter = (AsymmetricKeyParameter)pemReader.ReadObject();
    
                // 获取privatekey对应的keyparameter的第二种方法
                //var publicKey = Convert.FromBase64String(_publicKeyString);
                //var keyParameter = PublicKeyFactory.CreateKey(publicKey);
    
                // 用私钥解密的第一种方法
                //var engine = new RsaEngine();
                //engine.Init(false, keyParameter);
                //var blockSize = engine.GetInputBlockSize();
                //engine.ProcessBlock(dataToDecrypt, 0, blockSize);
    
                // 用私钥解密的第二种方法
                IBufferedCipher cipher = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding");
                cipher.Init(false, keyParameter);
                var decipheredBytes = cipher.DoFinal(bytesToDecrypt);
    
                var decipheredText = Encoding.UTF8.GetString(decipheredBytes);
    
                Console.WriteLine("用公钥解密后的数据：" + decipheredText);
            }
        }
    }

[NetCore _RSA]: http://www.cnblogs.com/fengqiaoyebo/p/8435456.html