private string GetSha256Thumbprint()
{
if (_thumbprint is null)
{
var key = Jwk.FromRSAParameters(_privateKey.ExportParameters(false));
string json = "{\"e\":\"" + key.Exponent + "\",\"kty\":\"RSA\",\"n\":\"" + key.Modulus + "\"}";
using (var sha256 = SHA256.Create())
{
byte[] hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(json));
_thumbprint = Base64Url.Encode(hash);
}
}
return(_thumbprint);
}
private JsonObject GetMessageHeader(string url, Nonce nonce)
{
var header = new JsonObject {
{ "alg", AlgorithmNames.RS256 },
{ "nonce", nonce.Value },
{ "url", url }
};
if (_accountUrl != null)
{
header.Add("kid", _accountUrl);
}
else
{
var jwk = Jwk.FromRSAParameters(_privateKey.ExportParameters(includePrivateParameters: false));
header.Add("jwk", JsonObject.FromObject(jwk));
}
return(header);
}