How to ensure that the public key, private key, and CSR match each other and are valid?

Question

How to ensure that the public key, private key, and CSR match each other and are valid?

180 Views Asked by kian At 26 April 2023 at 11:52

I generated a private/public key pair using the command openssl genrsa -out totorialspedia.key 2048. I then extracted the public key using the command openssl rsa -in totorialspedia.key -pubout -out tutorialspedia_public.key. I also created a CSR file and provided the required information such as country name, state, locality name, organization name, organization unit name, common name, email address, and password.

Now, I have a totorialspedia.key file as the private key, which contains the public key, and a tutorialspedia_public.key file as the public key. I also have a tutorialspedia.csr file as the CSR.

and a tutorialspedia_public.key as a public key file like this:

and a tutorialspedia.csr file like this:

I want to know if these files are valid, match each other and can work correctly. I tried this code to encrypt a simple text and decrypt it by my keys but it didn't work

using System;
using System.Security.Cryptography;
using System.Text;

namespace ssl
{
    internal class Program
    {
        static void Main(string[] args)
        {

            // the data to be encrypted
            string dataToEncrypt = "Hello World!";

            // convert the public key string to a byte array
            byte[] publicKeyBytes = Convert.FromBase64String("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApFq4NaqdpTJjQkZlA0cPPDMbIfEg1XTVjsV5N4mwMgiYXizJBpySTcV8QY9Eb1UQ4Ewvm9z6VBS69kNuYXafo0gF/cdP/U3zyX55WMIJclyPpjfw15WUkfndqnAZ8ibyTL85uxYlHbUg00omiUM0KkoQ93Nw7fJT+fbi1noPlp0Ut6izggJEQOzvnxdlXus1oGuyNTmITIBm/K0mVxXA3aGloxW1OFzLv/dQF0FMXAL37cy4/jFKNAvrw3HfuR3admivGHpmKy61OKaJvHppA5n0c3KjHmpduLI9s8P/8sFVSoEUUuiB1uSVHKwDh2yZfuefYgj3zkUA6GsocSaheQIDAQAB");

            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.ImportSubjectPublicKeyInfo(publicKeyBytes, out _);

            // create an RSACryptoServiceProvider object and load the public key
            //RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            //rsa.ImportRSAPublicKey(publicKeyBytes, out _);

            // convert the data to a byte array
            byte[] dataBytes = Encoding.UTF8.GetBytes(dataToEncrypt);

            // encrypt the data using the public key
            byte[] encryptedData = rsa.Encrypt(dataBytes, true);

            // convert the encrypted data to a base64-encoded string
            string base64EncryptedData = Convert.ToBase64String(encryptedData);

            //****************************************************************************
            // the data to be encrypted

            // convert the encrypted data from base64 to a byte array
            byte[] encryptedData2 = Convert.FromBase64String(base64EncryptedData);

            // convert the private key string to a byte array
            byte[] privateKeyBytes = Convert.FromBase64String("MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCkWrg1qp2lMmNCRmUDRw88Mxsh8SDVdNWOxXk3ibAyCJheLMkGnJJNxXxBj0RvVRDgTC + b3PpUFLr2Q25hdp + jSAX9x0 / 9TfPJfnlYwglyXI + mN / DXlZSR + d2qcBnyJvJMvzm7FiUdtSDTSiaJQzQqShD3c3Dt8lP59uLWeg + WnRS3qLOCAkRA7O + fF2Ve6zWga7I1OYhMgGb8rSZXFcDdoaWjFbU4XMu / 91AXQUxcAvftzLj + MUo0C + vDcd + 5Hdp2aK8YemYrLrU4pom8emkDmfRzcqMeal24sj2zw//ywVVKgRRS6IHW5JUcrAOHbJl+559iCPfORQDoayhxJqF5AgMBAAECggEABQThtv7Xu1uhcRzP + SSGhDS91YCk + 2vK2UYxzFbDtxVw3MBin7VwmNgo8iIXSYyYHDdrZUe / a8mpx3s579dE6wI4L56ydEZ5BUxb1ZBwZCoMN3viGp1OaRJPuQSdIDpdACe / UjWsCr8VKmqraFnxagCyybHAbz3NH3cxCHJ4DyX +le1YNU / 4XCAnyVn9GqW5Qf / O7SibVMCm8hsP1dQUiqrskA2rUPhEVkwDMyVWLflHveXuO40JPbFEbGk9SPitsSq7LcAxt76RIqvFhBWj0lxF5hq4advSxpcPD3z + 4 / 7jvNObYbPBr3OIJCEsV8PwzeLNAVh3oGsKbaWAee7zoQKBgQDaz9nHhsDsUfE5ZYUbHtYZEdWy8fms / b8FjsKhMFgNOD + mBAuRuWlIhcugrY87a9pXu0I54n81migSdzPdGeP7E7 / NUJ01LgY / lddvgpQWQ0M77nDCmlKm4mxV2mWF3P8sqIsJTP7H1JygJPuPxTayQ2pezlyUjXILiUjmuvrGoQKBgQDASYKSrcQD / rboB55Z91KRxp5y5kDNJLTaEL9HBB6gswabnOY + d7KS765dIRGfcL9XskmAHivpTj63K6LDjOQuvhxTi3lLy1kMq3BgKh1WYXrWuPTT4 / r7EruQxFYZIPZ + LZzs + OFYxOdKocnAFP9S6Ja8lbk25fwuilQ9FURj2QKBgEYHxeys / SvlYe37xukSKnWllp6KAV3TbIKr2TDblyLMANryan1 +OOsEH1LSmYfsEdqITT7Xdd1C9FZMnmXCNowSGw3sIhR2IXvSSjwfL6QcbPVOb / poh9FvoDquBlYcj / LMEousf9KXAnXiwDyYYtQU7YNgSpMk3f5BNvrZlw9hAoGBALgKI6VMF15TfrDaCd / F7guEdMc4RjGSvl4wxUKtWLsqXlq2c1C6s / oa2WJdckaOXTUMeXjcZ97nevNKGoDb6tIqN2ZnCfNXb6XGuMnxxR6WMkItyHa9r8x7A3bt1BI9EG94LMhK9TRHUbCG5VipQC8UWqGpFBrNSO8qirHkFw8RAoGBAMEDPT1bjhGGIfWEEs4AjY / BXkFMwXENqDhWXtt0E4dJE / Pbp9ca1rs30nTUPf05Q345PRGQtHi4vOnT + TtSh1wcdbsnd5VKD2G + gjmvcZg / VJtFMCtSjKSY2MTHZps / KvMC + LjsHJ3J4zlLUN + zEz3EEDhaJgooZNiSsyLo5A6P");

            // create an RSACryptoServiceProvider object
            RSACryptoServiceProvider rsa2 = new RSACryptoServiceProvider();

            // create an RSAParameters object to hold the private key parameters
            RSAParameters privateKeyParams = new RSAParameters();

            // set the private key parameters from the byte array
            privateKeyParams.Modulus = publicKeyBytes;
            privateKeyParams.D = privateKeyBytes;

            // import the private key parameters into the RSACryptoServiceProvider object
            rsa2.ImportParameters(privateKeyParams);

            // decrypt the data
            byte[] decryptedData = rsa.Decrypt(encryptedData2, false);

            // display the decrypted data
            Console.WriteLine("Decrypted data: " + Encoding.UTF8.GetString(decryptedData));
        }//end main 

    }
}

Thank you for your help.

Original Q&A

How to ensure that the public key, private key, and CSR match each other and are valid?

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