/**
* Get an encrypted pseudonym asynchronously.
* @param pp The polymorphic pseudonym to get an encrypted pseudonym for.
* @param sp The SP ID to get an encrypted pseudonym for.
* @return A task that will result in the Encrypted Pseudonym.
*/
public async Task<Pseudonym> GetEPAsync(Pseudonym pp, string sp)
{
HttpClient client = new HttpClient();
HttpResponseMessage message = await client.GetAsync(string.Format(url,
WebUtility.UrlEncode(pp.Encode()), WebUtility.UrlEncode(sp)));
string epString = await message.Content.ReadAsStringAsync();
return Pseudonym.Decode(epString);
}
/**
* Store a polymorphic pseudonym in the database.
* @param user The User ID to store the polymorphic pseudonym for.
* @param pp The polymorphic pseudonym to store.
*/
public void AddPolymorphic(string user, Pseudonym pp)
{
PolymorphicPseudonym pseudonym = new PolymorphicPseudonym();
pseudonym.user = user;
pseudonym.pseudonym = pp.Encode();
pseudonym.id = System.Guid.NewGuid();
db.PolymorphicPseudonyms.InsertOnSubmit(pseudonym);
db.SubmitChanges();
}
/**
* Store a encrypted pseudonym in the database.
* @param user The User ID to store the encrypted pseudonym for.
* @param sp the SP ID to store the encrypted pseudonym for.
* @param ep The encrypted pseudonym to store.
*/
public void AddEncrypted(string user, string sp, Pseudonym ep)
{
EncryptedPseudonym pseudonym = new EncryptedPseudonym();
pseudonym.user = user;
pseudonym.sp = sp;
pseudonym.pseudonym = ep.Encode();
pseudonym.id = System.Guid.NewGuid();
db.EncryptedPseudonyms.InsertOnSubmit(pseudonym);
db.SubmitChanges();
}
/**
* Decrypt an Encrypted Pseudonym.
*
* @param ep The Encrypted {@link Pseudonym}
* @return The pseudonym from the Encrypted Pseudonym
*/
public byte[] DecryptPseudonym(Pseudonym ep)
{
ECPoint pseudonym = ep.B.Subtract(ep.A.Multiply(keyPair.PrivateKey));
pseudonym = pseudonym.Multiply(closingKey);
return Util.Hash(pseudonym.GetEncoded());
}
