private static async Task <T> GetAndVerifySignedDataAsync <T>(string signedDataJson) where T : class
{
var signedData = await JsonUtils.DeserializeAsync <SignedData>(signedDataJson);
var dataJson = Config.DefaultEncoding.GetString(signedData.Data);
var baseModel = await JsonUtils.DeserializeAsync <BaseModel>(dataJson);
if (baseModel?.Sender?.PublicKey == null)
{
return(null);
}
AsymmetricKeyParameter publicKey;
try
{
var publicKeyPem = baseModel.Sender.PublicKey.Replace("RSA PUBLIC KEY", "PUBLIC KEY");
publicKey = PemUtils.GetKeyFromPem(publicKeyPem);
}
catch (ArgumentException)
{
return(null);
}
var dataToVerify = Config.DefaultEncoding.GetBytes(Convert.ToBase64String(signedData.Data));
var isValid = SignUtils.Verify(dataToVerify, signedData.Signature, publicKey);
if (!isValid)
{
return(null);
}
var text = Config.DefaultEncoding.GetString(signedData.Data);
var model = await JsonUtils.DeserializeAsync <T>(text);
return(model);
}