[Solved] RSA encrypting and decrypting

RSA encrypting and decrypting

Hey! I'm trying to make a function that takes a public key and text to format as parameters, both as strings. I'm trying to log in to steam via post requests and have to pass in the password encrypted with RSA key gotten from steam. I can get the key from steam fine as string but I cannot find a working way to use the key to encrypt the password.

I haven't worked yet with RSA. The concept seems to be interesting though. So. After googleing it, I guess, this is what you are looking for:

Code:

public static string Encryption(string strText)
        {
            var publicKey = "<RSAKeyValue><Modulus>21wEnTU+mcD2w0Lfo1Gv4rtcSWsQJQTNa6gio05AOkV/Er9w3Y13Ddo5wGtjJ19402S71HUeN0vbKILLJdRSES5MHSdJPSVrOqdrll/vLXxDxWs/U0UT1c8u6k/Ogx9hTtZxYwoeYqdhDblof3E75d9n2F0Zvf6iTb4cI7j6fMs=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

            var testData = Encoding.UTF8.GetBytes(strText);

            using (var rsa = new RSACryptoServiceProvider(1024))
            {
                try
                {
                    // client encrypting data with public key issued by server                    
                    rsa.FromXmlString(publicKey.ToString());

                    var encryptedData = rsa.Encrypt(testData, true);

                    var base64Encrypted = Convert.ToBase64String(encryptedData);

                    return base64Encrypted;
                }
                finally
                {
                    rsa.PersistKeyInCsp = false;
                }
            }
        }


Source: https://stackoverflow.com/questions/17128038/c-sharp-rsa-encryption-decryption-with-transmission

Originally Posted by defaulto

I haven't worked yet with RSA. The concept seems to be interesting though. So. After googleing it, I guess, this is what you are looking for:

Code:

public static string Encryption(string strText)
        {
            var publicKey = "<RSAKeyValue><Modulus>21wEnTU+mcD2w0Lfo1Gv4rtcSWsQJQTNa6gio05AOkV/Er9w3Y13Ddo5wGtjJ19402S71HUeN0vbKILLJdRSES5MHSdJPSVrOqdrll/vLXxDxWs/U0UT1c8u6k/Ogx9hTtZxYwoeYqdhDblof3E75d9n2F0Zvf6iTb4cI7j6fMs=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

            var testData = Encoding.UTF8.GetBytes(strText);

            using (var rsa = new RSACryptoServiceProvider(1024))
            {
                try
                {
                    // client encrypting data with public key issued by server                    
                    rsa.FromXmlString(publicKey.ToString());

                    var encryptedData = rsa.Encrypt(testData, true);

                    var base64Encrypted = Convert.ToBase64String(encryptedData);

                    return base64Encrypted;
                }
                finally
                {
                    rsa.PersistKeyInCsp = false;
                }
            }
        }


Source: https://stackoverflow.com/questions/17128038/c-sharp-rsa-encryption-decryption-with-transmission

It's giving me some errors:

x64: Unhandled Exception: System.PlatformNotSupportedException: Operation is not supported on this platform.
x86: Unhandled Exception: System.BadImageFormatException: Could not load file or assembly 'C:\Users\makez\source\repos\RSA\RSA\bin\x86\Relea se\netcoreapp2.1\RSA.dll'. An attempt was made to load a program with an incorrect format.

(In build settings application type is set to console application)

Originally Posted by JustWorkHereLUL

Wait I give it a try myself. Will edit this reply when I got it working.
Did you downloaded something extra? It should be already included in the .NET Framework, which can be used by "using System.Security.Cryptography;".
Is NET Core actually the same as the NET Framework?