How do I decode a BASE64, PCKS-8 representation of a private key in .net?

Question

I\'m working on integrating my application with the Walmart Marketplace API. Their documentation pretty much says if you don\'t use Java you\'re on your own. My application

Answer 1

it works for me using c# .net 4.6

using System;
using System.Security.Cryptography;
public static string SignData(string stringToBeSigned, string encodedPrivateKey)
        {
            string signedData = string.Empty;
            try
            {
                var decodeKey = Convert.FromBase64String(privateEncodedStr);
                var key = CngKey.Import(decodeKey, CngKeyBlobFormat.Pkcs8PrivateBlob);
                var alg = new RSACng(key);
                byte[] data = Encoding.UTF8.GetBytes(stringToBeSigned);
                byte[] signData = alg.SignData(data, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
                signedData = Convert.ToBase64String(signData);
            }
            catch (Exception)
            {
                throw;
            }
            return signedData;
        }