public async Task <bool> initializeEncryptionVariables()
{
string response = await new HttpRequester().RetrieveMessage("/connect");
JsonSerializerOptions serializerOptions = new JsonSerializerOptions();
serializerOptions.Converters.Add(new BigIntegerConverter());
InitialPackageContainer initialPackageContainer = JsonSerializer.Deserialize <InitialPackageContainer>(
response,
serializerOptions);
if (!Verifying.verifyMessage(
initialPackageContainer.signature, JsonSerializer.Serialize(
initialPackageContainer.initialPackage,
serializerOptions
),
initialPackageContainer.initialPackage.ServerPuk,
initialPackageContainer.initialPackage.EllipticCurve))
{
return(false);
}
ClientVariables.Puk = KeyGeneration.calculatePublicKey(
ClientVariables.Prk, initialPackageContainer.initialPackage.EllipticCurve);
ClientVariables.SharedKey = KeyGeneration.calculateMasterKey(
ClientVariables.Prk, initialPackageContainer.initialPackage.ServerPuk,
initialPackageContainer.initialPackage.EllipticCurve);
ClientVariables.EllipticCurve = initialPackageContainer.initialPackage.EllipticCurve;
ClientVariables.NiosKey = initialPackageContainer.initialPackage.NiosKey;
return(true);
}
private string getInitialPackage()
{
InitialPackage initialPackage = EncryptionVariables.initialPackage;
JsonSerializerOptions serializerOptions = new JsonSerializerOptions();
serializerOptions.Converters.Add(new BigIntegerConverter());
string initialPackageJson = JsonSerializer.Serialize(initialPackage, serializerOptions);
Signature signature = Signing.signMessage(initialPackageJson, EncryptionVariables.EllipticCurveForClient,
EncryptionVariables.PrkcForClient);
InitialPackageContainer container = new InitialPackageContainer()
{
initialPackage = initialPackage, signature = signature
};
return(JsonSerializer.Serialize(container, serializerOptions));
}
