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/*
This file is part of TALER
(C) 2014 Christian Grothoff (and other contributing authors)
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file mint.h
* @brief Common structs passed all over the mint logic
* @author Florian Dold
* @author Benedikt Mueller
*/
#ifndef _MINT_H
#define _MINT_H
#include <gnunet/gnunet_util_lib.h>
#include <jansson.h>
#include "taler_util.h"
/**
* For now, we just do EUR. Should become configurable
* in the future!
*/
#define MINT_CURRENCY "EUR"
/**
* Public information about a coin (including the public key
* of the coin, the denomination key and the signature with
* the denomination key).
*/
struct TALER_CoinPublicInfo
{
/**
* The coin's public key.
*/
struct GNUNET_CRYPTO_EcdsaPublicKey coin_pub;
/**
* Public key representing the denomination of the coin
* that is being deposited.
*/
struct GNUNET_CRYPTO_rsa_PublicKey *denom_pub;
/**
* (Unblinded) signature over @e coin_pub with @e denom_pub,
* which demonstrates that the coin is valid.
*/
struct GNUNET_CRYPTO_rsa_Signature *denom_sig;
};
/**
* Information we keep for a withdrawn coin to reproduce
* the /withdraw operation if needed, and to have proof
* that a reserve was drained by this amount.
*/
struct CollectableBlindcoin
{
/**
* Our signature over the (blinded) coin.
*/
struct GNUNET_CRYPTO_rsa_Signature *sig;
/**
* Denomination key (which coin was generated).
*/
struct GNUNET_CRYPTO_rsa_PublicKey *denom_pub;
/**
* Public key of the reserve that was drained.
*/
struct GNUNET_CRYPTO_EddsaPublicKey reserve_pub;
/**
* Signature confirming the withdrawl, matching @e reserve_pub,
* @e denom_pub and @e h_blind.
*/
struct GNUNET_CRYPTO_EddsaSignature reserve_sig;
};
/**
* Global information for a refreshing session.
*/
struct RefreshSession
{
/**
* Signature over the commitments by the client.
*/
struct GNUNET_CRYPTO_EddsaSignature commit_sig;
/**
* Public key of the refreshing session, used to sign
* the client's commit message.
*/
struct GNUNET_CRYPTO_EddsaPublicKey session_pub;
/**
* Number of coins we are melting.
*/
uint16_t num_oldcoins;
/**
* Number of new coins we are creating.
*/
uint16_t num_newcoins;
/**
* Number of parallel operations we perform for the cut and choose.
* (must be greater or equal to three for security).
*/
uint16_t kappa;
/**
* Index (smaller @e kappa) which the mint has chosen to not
* have revealed during cut and choose.
*/
uint16_t noreveal_index;
/**
* FIXME.
*/
int has_commit_sig;
/**
* FIXME.
*/
uint8_t reveal_ok;
};
/**
* For each (old) coin being melted, we have a `struct
* RefreshCommitLink` that allows the user to find the shared secret
* to decrypt the respective refresh links for the new coins in the
* `struct RefreshCommitCoin`.
*/
struct RefreshCommitLink
{
/**
* Transfer public key (FIXME: explain!)
*/
struct GNUNET_CRYPTO_EcdsaPublicKey transfer_pub;
/**
* Encrypted shared secret to decrypt the link.
*/
struct TALER_EncryptedLinkSecret shared_secret_enc;
};
/**
* We have as many `struct RefreshCommitCoin` as there are new
* coins being created by the refresh.
*/
struct RefreshCommitCoin
{
/**
* Encrypted data allowing those able to decrypt it to derive
* the private keys of the new coins created by the refresh.
*/
struct TALER_RefreshLinkEncrypted *refresh_link;
/**
* Blinded message to be signed (in envelope), with @e coin_env_size bytes.
*/
char *coin_ev;
/**
* Number of bytes in @e coin_ev.
*/
size_t coin_ev_size;
};
#endif /* _MINT_H */
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