using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        string keyPem = @"-----BEGIN RSA PRIVATE KEY-----

MIIJKgIBAAKCAgEAvWYJ7W5XBA5lwDCbgQX2kbZZaHSuMD+50ln7lRhuhu5Zzn7C

1Iz3SmntF7vzrrtYHt8v5Cr7S4uh8GWwLr5k3Bq9xowHKnMM91DFUVCW1U0x2Jav

RtU79QLzLZDdh/bVcv0VSA3ZiM2yPgwY2HzJmgiLu8OZB40Lk80mf3VPfdBMkD35

IlQzJC1/KV8fVP+eWOXPq8fTX/w3mNpANVnIAYGe7WsoygUMXuivi9DXAgUzDK5y

5gdOmhta9EK+4wMrdFF7tk7vEL8r/cy+6rA/mRHNKRhxRKzoRQZfchpPvFk1+hJr

t214/78Uf65E3NJlZKXWl2JwpmOmqpnUrGiGnotqzNX/RHgZVqwUgZqHuHS+m6wi

vfDMxjJg1861xOHGFMk2wpJhWReaQxPAwyatJrbCo7BsgXLlGGa4wdLq2/IMBONC

w7W6xfC4QzW3pmCV5E0z6PGT1+s4YAE32qKjbCO6Xff5DOmKp8qQKykM++Rd7MHT

gOiYdoWt4X+Us2YJMWZ1YG1coYapFVLW9TuO3R+Mn0MxuwomqChd3bsvEtTxG/cI

06uBLrz5DthwtbE35NlDKJhoeDnMHRc1Z+knrCFFIM4U3GSS/CxfugMD7kgb1vvr

MnquP23EEFtWfZndSsKkCh6VyqOTLYEIYEKeE+MEkWL3AXFUvinfb1gpBD8CAwEA

AQKCAgEAubPM1BI2G3IKbjC6p/0yz5gdff+5svEov4ke1gdIh+A4CfHcEg/NgBbw

My9ENPTX6B0plexWzLGyLEVoQ8zGk9FcdcpiVErOUcfOUHZWDfpMf3LvlOIKkac8

zFaX/3ITw1VGgomh2zLkK1YtHkbsXK04ZPfZmb+/tEGYF6zsLg4Io/0/w1sPcc9y

ORxdWjfwCHX78xBQvnJMCQElp6nKIz/2lg9VxQ7CHGTFiq9PwVlbvnlliwlrFkrw

GUNAatF2z+v9ArnOSXtIJOeV4gLBuNHtePfQR2fJrbQb7YLC34gRFortNsKNuySd

crtqJaHdbJv2FiSdE2ftyKRgFFPAeQ+gcUEOqsgmtDeJcBGR7mocS+WL2ecevDeL

iqxkYaPocRUVaEQIfgIQdMp7il1uhOqUymQMTDZQDw8AHcuIvvbXM+WWFC+dRZm9

CmJ50A8P8jliWQR3c6QcdeLhhpyhuOgICUi48uFE6yx1zD18X0ET16XWiXI8OL75

RaMaCfH2fUnBxq1a1M9IcWICuI2xm9XicFSBR7dreDQe1q2dXVVIr9gGzrPluP1+

CrserjQDtkPYUbX5zOjGjwvUTv6ZehdTwDpAVcYaShMCkdLG8l0FfQEc5X3Sr4iT

1igMUW4/LMg12wjA5HFyZ8ZKgWWtQsTD4F00r+qI1tg3QUsibrECggEBAN7RFtnU

FRdgdTerWiOAa4lwfX89OEXj5bELSQbQsylXLhyf/pov2ujJbQLaqX+eRGFDXX7r

cWYBPvKFZfNk9PMJEjSfReOHW3yT7ev+god22YAbXyxjjCxdmFKmGU9j7UZd2AUs

yf3EGIp7d+Q1AGCtDK/ldcvMmMy92V82pKjKa7ADpfS1BLOOVv9XadYap/MwoJqc

T+pTCcYyQEECUyYmG9jZuDml52yDJ+1YEP7oQq5nB6duKk+h3KFK8jQmlHFarwQK

FVv1YSPFL4XZS0Vk0u6wZsS6nSoHuQjmBFxGQubj54/EfArTbP6sdAUczp68ENb/

n8nWYV0an7u5QGsCggEBANma4O8T6VpTdsu1TgR7dtiR4G7S5TsBmJHwsw8RUpwV

SlSQ2RQiN+NVjcMA5pk247M3bpI9S3r3GCgqm2Lxb1H6+iclGxu28+VEb2yvexfJ

4mQHdBQVsNHfn955friXFJDyGVfcjqu29Oo7JoTpNMIC5MvX+ajlmz3bk2VAQvHd

BHNl9UcYszbC/58CaB7wA7XwjAt3c0vsk1l/RlKhSolT8qhF0hsHZKe4fRu17IxQ

BdTYI3dJSVKqeLx3TgHoim3tK9jgRMwC/wRxHuCaRSpAipQ2wveVGPcMIObhCbQ2

nYFunFQcTcxs4ZTDhb2gN06RMlJezNFAEGpjlLYBsH0CggEAHVq6gfQY2z2P88eV

VnwCrtatEehE06BUkGCGPGmeUOH1ZzwE1NddJbHztJ6OGgwFwjKXzLLD+8ZKPrUo

W0p/os0dIuWg1XrtqJnsjFy5YZNc0C3K+hQbUXT7LlhHmVf22IBghz4BVndRLF1b

zCrXY+UoeLvoKvNHZiHU02BljP8t9MBmSrjWZ7lm6Ljhbp2QZs+POQ9C0AIklYHl

SSs/PRVkMcttI9shhAA7cF9bzdlXf5Z/QaWX2WnfoTg4dHposA5cZFHXwoevRoEh

46Ze7kN8Lon64AwdzH27+Nok1OtEwRphVWVzWhHEmECsAEhtSChKp6iBqpudtCBf

zuF3BQKCAQEAj68u226gZR47kOMUsuz7WqFoOoVTC5VQMv1mnopnq9x7Cj/ituKp

WJkDVEHiAkU2MP5nKnUCxB0ofE018S1OvikkyHg94Bz8CuUXVgLBGsIZlMc/JIv2

B37Lx1EeFbDcyaCyj0t5gXT7XzbThmuehIT4oojnt1h1G3FDcFXwXlf8Ol6WiO2M

WJqFw28JZXRCXv6I2oFzRizeVvgtbR5HY0plLit8QpCtK/or0gJcQYINd6+IK5ne

qpEZzAhTH/t2fINgsoHTq4pG7Z3sL45uISog1yEZt/VhWK9PgmQRzkdJ1U8+NmPC

EzvJ8DrysnV6T4ycV7t1Lq5IqJc8eLnA2QKCAQEAn48sq9RD0tKLLkE44Suv2q77

s0BwbfLeqEjKuyizqup9DkrycB5zua6HIfsHfy5a7SbXCJnZL2nG+N2PHT2gBdLS

guweOYmMP+Ju/R3i9kpL7N2WWvAavnPOHEOVXu6g7MTXJSrwMCRFsQjy2ligFv5X

/ekclGPCnt2i5wLoW9Hr95Cp7Pw0NjfkHeIzwLy7TjjnkCKheFUs+lbuhJv5rW53

Hoinj27yTjnapS/EykToKqWVWkagWQDHJERBDqNG4XOWwCX2PwFn/M/aiHV12Dox

PstQQs8L7NXUisg7Ya8xZ6Gw7AoHgkXy0m8w6bfaw9IqxCqDyK1qtgSTog61qQ==

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

        string ciphertextFromNodeJS = "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";

        string ciphertextFromPython = "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";

​

        //ValidateDecryptData(encryptionDecryptionParams);

        //byte[] numArray = Convert.FromBase64String(encryptionDecryptionParams.CipherText);

        byte[] numArray = Convert.FromBase64String(ciphertextFromNodeJS);

        //byte[] numArray = Convert.FromBase64String(ciphertextFromPython);

        string str = string.Empty;

        //var tuple = LoadCertificateAndPrivateKey(encryptionDecryptionParams.PrivateKey, encryptionDecryptionParams.PrivateKeyPassword);

        using (RSACryptoServiceProvider privateKey = new RSACryptoServiceProvider())

        {

            //privateKey.ImportParameters(tuple.Item2);

            privateKey.ImportFromPem(keyPem);

            byte[] numArray1 = null;

            //numArray1 = privateKey.Decrypt(numArray, encryptionDecryptionParams.IsOAEPWithSHA1AndMGF1Padding);

            numArray1 = privateKey.Decrypt(numArray, false);

            str = Encoding.UTF8.GetString(numArray1);

        }

        Console.WriteLine(str);

    }

}