using System;

using System.Security.Cryptography;

using System.Collections.Generic;

using Jose;

using System.Text.Json;

using System.Text;

using Newtonsoft.Json;

using System.Text.RegularExpressions;

​

class RrsaSignatureString {

    class Header {

    }

    class Recipients {

        public Header header {get; set;}

        public string encrypted_key {get; set;}

    }

    class JweObj {

            public Recipients[] recipients {get; set;}

            [JsonProperty(PropertyName = "protected")]

            public string _protected {get; set;}

            public string ciphertext {get; set;}

            public string iv {get; set;}

            public string tag {get; set;}

    }

    class BankCodeReq {

        public string isPaymentIBFT = "N";

    }

    class BodyReq {

        public BankCodeReq body {get; set;}

        public BodyReq() {

            BankCodeReq obj = new BankCodeReq();

            this.body = obj;

        }

    }

    class BodyInput {

        public string appAcct {get; set;}

        public string benAcct {get; set;}

        public string benAcctName {get; set;}

        public string benbankCode {get; set;}

        public string benbankName {get; set;}

        public string tranType {get; set;}

        public string amount {get; set;}

        public string curr {get; set;}

        public string charge {get; set;}

        public string remark {get; set;}

        public string effdate {get; set;}

        public BodyInput() {

            this.appAcct = "1600000848";

            this.benAcct = "2612589163";

            this.benAcctName = "VSYUPH VJO VJYA MOPJ";

            this.benbankCode = "01202020";

            this.benbankName = "NHTMCP DAU TU VA PT XN";

            this.tranType = "1";

            this.amount = "1000000";

            this.curr = "VND";

            this.charge = "E";

            this.remark = "NGUYEN VAN A Chuyen Tien";

            this.effdate = "20231231";

        }

    }

    public static void Main() {

        BodyInput obj = new BodyInput();

        String payloadRequest = JsonConvert.SerializeObject(obj);

        String encryptData = doEncryptJWE(payloadRequest);

        String X_JWS_SIGNATURE = doSignatureJWS(encryptData);

    }

    private static byte[] hexStringToBytes(String s) {

        byte[] ans = new byte[s.Length / 2];

​

        for (int i = 0; i < ans.Length; i++) {

            int index = i * 2;

            int val = Convert.ToInt32(s.Substring(index, 2),16);

            ans[i] = (byte) val;

        }

​

        return ans;

    }

​

    public static String doEncryptJWE(String payload) {

            byte[] key = hexStringToBytes("746163353431386f6b6d6e626c6f7071746163353431386f6b6d6e626c6f7033");

            // Encrypt the payload using JWE

​

            string jwe = Jose.JWT.Encode(payload, key, JweAlgorithm.A256KW, JweEncryption.A128GCM);

            string[] split = jwe.Split(".");

            string protected_ = split[0];

            string encryptedKey = split[1];

            string iv = split[2];

            string ciphertext = split[3];

            string tag = split[4];

            //byte[] bytes = Convert.FromBase64String(protected_ + "=");

            //string item_protected = Encoding.UTF8.GetString(bytes);

            //var h = JsonConvert.DeserializeObject<Header>(item_protected);

            Recipients recipient = new Recipients();

            recipient.header = new Header();

            recipient.encrypted_key = encryptedKey;

            Recipients[] recipients = new Recipients[1];

            recipients[0] = recipient;

            JweObj jwePayload = new JweObj();

            jwePayload.recipients = recipients;

            jwePayload._protected = protected_;

            jwePayload.ciphertext = ciphertext;

            jwePayload.iv = iv;

            jwePayload.tag = tag;

            //requestbody gui len bidv

            String payloadRequest = JsonConvert.SerializeObject(jwePayload);

            Console.WriteLine(payloadRequest);  

            return payloadRequest;

    }

        public static String doSignatureJWS(String payloadRequest) {

            //--lay thong tin truyen vao header JWS

            RSA rsaAlg = RSA.Create();

            byte[] privateKeyByte = getRsaPrivateKeyEncodedFromPem(loadRsaPrivateKeyPem());

            int _out;

            rsaAlg.ImportPkcs8PrivateKey(privateKeyByte, out _out);

            string TXT_DATA = Jose.JWT.Encode(payloadRequest, rsaAlg, Jose.JwsAlgorithm.RS256);

             char[] delimiterChars = {'.'};

            string[] words = TXT_DATA.Split(delimiterChars);

            string X_JWS_SIGNATURE = words[0] + ".." + words[2];

            Console.WriteLine(X_JWS_SIGNATURE); 

            return X_JWS_SIGNATURE;

    }

​

    static string Base64Encoding(byte[] input) {

        return Convert.ToBase64String(input);

    }

​

    static byte[] Base64Decoding(String input) {

        return Convert.FromBase64String(input);

    }

​

    private static byte[] getRsaPrivateKeyEncodedFromPem(string rsaPrivateKeyPem) {

        string rsaPrivateKeyHeaderPem = "-----BEGIN PRIVATE KEY-----\n";

        string rsaPrivateKeyFooterPem = "-----END PRIVATE KEY-----";

        string rsaPrivateKeyDataPem = rsaPrivateKeyPem.Replace(rsaPrivateKeyHeaderPem, "").Replace(rsaPrivateKeyFooterPem, "").Replace("\n", "");

        return Base64Decoding(rsaPrivateKeyDataPem);

    }

​

    private static string loadRsaPrivateKeyPem() {

​

        return "-----BEGIN PRIVATE KEY-----\n" +

    "MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDqX3WWr2Cte2uC\n" +

    "u1uK+i4hZ/G89Ar+XCHYiEgC/MB8xQqCDfMdaA1kKGRoFm4ClhrI1rPy5TFH9Fxg\n" +

    "JhMQKYnYmSfG1LTTHNVN2/FHzRGZteRy+EYoy5ldt5/5AdxQVGexspUYazv5oMkT\n" +

    "UnbvvA7iwJJg2UrgoWJnVQnIBRc0WJ5PBJS8OzphfvGYQ9OUB/Abf7Uv+WncAfdR\n" +

    "D+qz9U/1i7InJ/zbVvs6GdObAJUFjEruUGc62TJC3Ef01klulk9gK5wlGDLNS5Cm\n" +

    "bnaswWGe1TzVHT3bo8oSBjIVnazRzlVZ4w8jJ+VQdl0DzjnGHwvwmD3JTi6jy05E\n" +

    "QeeqfgQTAgMBAAECggEABSy8ZOpUYSAzfHx0hfoGILixzrE4uOsB2E0SAfbgrSCQ\n" +

    "ndR/BKwyd36o0N+F6Eq2Jq8O5BMJZoRPsdPFYfr4zy56gVpa77pYP1LW3fX6KIGq\n" +

    "nJs8uVPdfAM85fuTiLaEX5kIz7Q2a8mQBvwwIhTt4zXLRZYmoBUQHiXzhFYQcBhl\n" +

    "/Vs5zn2MN73Ui1T8nhfS1f9a9HSnEeZr5RXBFBg1cctVq+XForsePgIB6W63oEV5\n" +

    "yYSc1l7QzjcHOcNPS6lVX/segf9jIHYT88NyZaVq/rUj6gCacTvUDiBg597m6S4N\n" +

    "M5LWCJce/5InHMKAqfqN8Ig5913qrxbABx4RRfcu4QKBgQD1KrsioEDf+4ZTiI9F\n" +

    "qg6D74iwkuZs/MTsYZ2oIA0fHwJa/AAonc+QvghhFUjd5Q0+e3mPGq9FGIMmRbKq\n" +

    "LGFeUXxmQel5r0madiuANRdH/BdcKe12z3oGESk/r066XWTgzKVwBcSmNAHHYvxz\n" +

    "kwer8qMITh/GMlyQc5RjQrOsEQKBgQD0uqD9v2Mj20JXcUUa5z4URnf/3se0ajV4\n" +

    "ti/jEaULJ21OGsz51bjH3/uGFRYt1zv8hu/nV/RKCrWU5QEc4BVEVHrBob3T283f\n" +

    "7MkJvCoTPpUTmITL2mbAS8yqLFA5Yl96/LE35XRNrENHzMNecMwFv6dG5B0865sg\n" +

    "jwZCw1ph4wKBgQCKZPO8SSA2D+M01lqiJawJ+DZ+Dn66uTlkgnofxPADSFrpB2YD\n" +

    "h4n7F/rc6sn2UG1YfxUQniygYYTvHtsLSwAv4OnLQ5vLUBLJebl2pwGcZga9xQFC\n" +

    "Vz53nEpfo9NaSow+hedBxE/MzoDOj+cYSsBC5TX44zj2hclQ1Z3HJokMMQKBgH64\n" +

    "cIpT4rL7YrPCjCTtHkEDaDmOktwBruRtegha55oJ9VhfGko3d3HPsf7wxkZAT+hn\n" +

    "uquQ6Ia6WuHZXqUkBv8Vu2auKIweIdFUW5j13NeQLUMzU3f3BAOIfFaVkYjVPlmB\n" +

    "pQYrgviBPWldRsCNKafEYIqdreIQoYfPZ0+EtjU/AoGBAL/BXFYRtuWc++UAcobt\n" +

    "b6qgxRjAbxB8QfhLvtaZjuQxsif7FIG2tR/imduk7XqV3BYJm3I6WEWd09n7k3Ol\n" +

    "zj1E2wPQj0CdKnQfsMIUYQH7waXoJFvo9rT1UEB3sKaF5WwW537Q2d8WnM1Vknlz\n" +

    "JwCx1488iXYO18uU4cjVfK7q\n" +

    "-----END PRIVATE KEY-----";

​

    }

​

​

}