From c4f75cfc1b4b558c13befc281cecb52051b345b3 Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Thu, 6 Aug 2015 16:40:21 +0200 Subject: [PATCH] more work on /refresh skeleton and internal data structures --- src/mint-lib/mint_api_refresh.c | 360 +++++++++++++++++++++++++++++++- 1 file changed, 354 insertions(+), 6 deletions(-) diff --git a/src/mint-lib/mint_api_refresh.c b/src/mint-lib/mint_api_refresh.c index 723fe7070..30d24e024 100644 --- a/src/mint-lib/mint_api_refresh.c +++ b/src/mint-lib/mint_api_refresh.c @@ -33,6 +33,321 @@ /* ********************* /refresh/ common ***************************** */ +/* structures for committing refresh data to disk before doing the + network interaction(s) */ + +GNUNET_NETWORK_STRUCT_BEGIN + +/** + * Header of serialized information about a coin we are melting. + */ +struct MeltedCoinP +{ + /** + * Private key of the coin. + */ + struct TALER_CoinSpendPrivateKeyP coin_priv; + + /** + * Amount this coin contributes to the melt, including fee. + */ + struct TALER_AmountNBO melt_amount_with_fee; + + /** + * The applicable fee for withdrawing a coin of this denomination + */ + struct TALER_AmountNBO fee_withdraw; + + /** + * Transfer private keys for each cut-and-choose dimension. + */ + struct TALER_TransferPrivateKeyP transfer_priv[TALER_CNC_KAPPA]; + + /** + * Timestamp indicating when coins of this denomination become invalid. + */ + struct GNUNET_TIME_AbsoluteNBO deposit_valid_until; + + /* Followed by serializations of: + 1) struct TALER_DenominationPublicKey pub_key; + 2) struct TALER_DenominationSignature sig; + */ +}; + + +/** + * Header for serializations of coin-specific information about the + * fresh coins we generate during a melt. + */ +struct FreshCoinP +{ + + /** + * Private key of the coin. + */ + struct TALER_CoinSpendPrivateKeyP coin_priv; + + /** + * Link secret used to encrypt the @a coin_priv and the blinding + * key in the linkage data. + */ + struct TALER_LinkSecretP link_secret; + + /* Followed by serialization of: + - struct TALER_DenominationBlindingKey blinding_key; + */ + +}; + + +/** + * Header of serialized data about a melt operation, suitable for + * persisting it on disk. + */ +struct MeltDataP +{ + + /** + * Hash over the melting session. + */ + struct GNUNET_HashCode melt_session_hash; + + /** + * Transfer secrets for each cut-and-choose dimension. + */ + struct TALER_TransferSecretP transfer_secrets[TALER_CNC_KAPPA]; + + /** + * Number of coins we are melting, in NBO + */ + uint16_t num_melted_coins GNUNET_PACKED; + + /** + * Number of coins we are creating, in NBO + */ + uint16_t num_fresh_coins GNUNET_PACKED; + + /* Followed by serializations of: + 1) struct MeltedCoinP melted_coins[num_melted_coins]; + 2) struct TALER_MINT_DenomPublicKey fresh_pks[num_fresh_coins]; + 3) struct FreshCoinP fresh_coins[num_fresh_coins][k]; + */ +}; + + +GNUNET_NETWORK_STRUCT_END + + +/** + * Information about a coin we are melting. + */ +struct MeltedCoin +{ + /** + * Private key of the coin. + */ + struct TALER_CoinSpendPrivateKeyP coin_priv; + + /** + * Amount this coin contributes to the melt, including fee. + */ + struct TALER_Amount melt_amount_with_fee; + + /** + * The applicable fee for withdrawing a coin of this denomination + */ + struct TALER_Amount fee_withdraw; + + /** + * Transfer private keys for each cut-and-choose dimension. + */ + struct TALER_TransferPrivateKeyP transfer_priv[TALER_CNC_KAPPA]; + + /** + * Timestamp indicating when coins of this denomination become invalid. + */ + struct GNUNET_TIME_AbsoluteNBO deposit_valid_until; + + /** + * Denomination key of the original coin. + */ + struct TALER_DenominationPublicKey pub_key; + + /** + * Mint's signature over the coin. + */ + struct TALER_DenominationSignature sig; + +}; + + +/** + * Coin-specific information about the fresh coins we generate during + * a melt. + */ +struct FreshCoin +{ + + /** + * Private key of the coin. + */ + struct TALER_CoinSpendPrivateKeyP coin_priv; + + /** + * Link secret used to encrypt the @a coin_priv and the blinding + * key in the linkage data. + */ + struct TALER_LinkSecretP link_secret; + + /** + * Blinding key used for blinding during blind signing. + */ + struct TALER_DenominationBlindingKey blinding_key; + +}; + + +/** + * Melt data in non-serialized format for convenient processing. + */ +struct MeltData +{ + + /** + * Hash over the melting session. + */ + struct GNUNET_HashCode melt_session_hash; + + /** + * Transfer secrets for each cut-and-choose dimension. + */ + struct TALER_TransferSecretP transfer_secrets[TALER_CNC_KAPPA]; + + /** + * Number of coins we are melting + */ + uint16_t num_melted_coins; + + /** + * Number of coins we are creating + */ + uint16_t num_fresh_coins; + + /** + * Information about the melted coins in an array of length @e + * num_melted_coins. + */ + struct MeltedCoin *melted_coins; + + /** + * Array of @e num_fresh_coins denomination keys for the coins to be + * freshly minted. + */ + struct TALER_DenominationPublicKey *fresh_pks; + + /** + * Arrays of @e num_fresh_coins with information about the fresh + * coins to be created, for each cut-and-choose dimension. + */ + struct FreshCoin *fresh_coins[TALER_CNC_KAPPA]; +}; + + +/** + * Free all information associated with a melted coin session. + * + * @param mc melted coin to release, the pointer itself is NOT + * freed (as it is typically not allocated by itself) + */ +static void +free_melted_coin (struct MeltedCoin *mc) +{ + GNUNET_CRYPTO_rsa_public_key_free (mc->pub_key.rsa_public_key); + GNUNET_CRYPTO_rsa_signature_free (mc->sig.rsa_signature); +} + + +/** + * Free all information associated with a fresh coin. + * + * @param fc fresh coin to release, the pointer itself is NOT + * freed (as it is typically not allocated by itself) + */ +static void +free_fresh_coin (struct FreshCoin *fc) +{ + GNUNET_CRYPTO_rsa_blinding_key_free (fc->blinding_key.rsa_blinding_key); +} + + +/** + * Free all information associated with a melting session. + * + * @param md melting data to release, the pointer itself is NOT + * freed (as it is typically not allocated by itself) + */ +static void +free_melt_data (struct MeltData *md) +{ + unsigned int i; + unsigned int j; + + for (i=0;inum_melted_coins;i++) + free_melted_coin (&md->melted_coins[i]); + GNUNET_free (md->melted_coins); + + for (i=0;inum_fresh_coins;i++) + GNUNET_CRYPTO_rsa_public_key_free (md->fresh_pks[i].rsa_public_key); + GNUNET_free (md->fresh_pks); + + for (i=0;inum_fresh_coins;j++) + free_fresh_coin (&md->fresh_coins[i][j]); + GNUNET_free (md->fresh_coins[i]); + } + /* Finally, clean up a bit... + (NOTE: compilers might optimize this away, so this is + not providing any strong assurances that the key material + is purged.) */ + memset (md, + 0, + sizeof (struct MeltData)); +} + + +/** + * Serialize melt data. + * + * @param md data to serialize + * @param[out] res_size size of buffer returned + * @return serialized melt data + */ +static char * +serialize_melt_data (const struct MeltData *md, + size_t *res_size) +{ + GNUNET_break (0); // FIXME: not implemented + *res_size = 0; + return NULL; +} + + +/** + * Deserialize melt data. + * + * @param buf serialized data + * @param buf_size size of @a buf + * @return deserialized melt data, NULL on error + */ +static struct MeltData * +deserialize_melt_data (const char *buf, + size_t buf_size) +{ + GNUNET_break (0); // FIXME: not implemented + return NULL; +} + /** * Melt (partially spent) coins to obtain fresh coins that are @@ -87,9 +402,16 @@ TALER_MINT_refresh_prepare (unsigned int num_melts, const struct TALER_MINT_DenomPublicKey *fresh_pks, size_t *res_size) { + struct MeltData md; + char *buf; + GNUNET_break (0); // FIXME: not implemented - *res_size = 0; - return NULL; + // FIXME: init 'md' here! + + buf = serialize_melt_data (&md, + res_size); + free_melt_data (&md); + return buf; } @@ -137,6 +459,10 @@ struct TALER_MINT_RefreshMeltHandle */ struct MAC_DownloadBuffer db; + /** + * Actual information about the melt operation. + */ + struct MeltData *md; }; @@ -238,6 +564,7 @@ TALER_MINT_refresh_melt (struct TALER_MINT_Handle *mint, struct TALER_MINT_RefreshMeltHandle *rmh; CURL *eh; struct TALER_MINT_Context *ctx; + struct MeltData *md; if (GNUNET_YES != MAH_handle_is_ready (mint)) @@ -245,7 +572,13 @@ TALER_MINT_refresh_melt (struct TALER_MINT_Handle *mint, GNUNET_break (0); return NULL; } - /* FIXME: parse "refresh_data" */ + md = deserialize_melt_data (refresh_data, + refresh_data_length); + if (NULL == md) + { + GNUNET_break (0); + return NULL; + } /* FIXME: totally bogus request building here: */ melt_obj = json_pack ("{s:o, s:O}", /* f/wire */ @@ -257,7 +590,7 @@ TALER_MINT_refresh_melt (struct TALER_MINT_Handle *mint, rmh->mint = mint; rmh->melt_cb = melt_cb; rmh->melt_cb_cls = melt_cb_cls; - + rmh->md = md; rmh->url = MAH_path_to_url (mint, "/refresh/melt"); @@ -311,6 +644,8 @@ TALER_MINT_refresh_melt_cancel (struct TALER_MINT_RefreshMeltHandle *rmh) rmh->job = NULL; } GNUNET_free_non_null (rmh->db.buf); + free_melt_data (rmh->md); /* does not free 'md' itself */ + GNUNET_free (rmh->md); GNUNET_free (rmh->url); GNUNET_free (rmh->json_enc); GNUNET_free (rmh); @@ -361,6 +696,10 @@ struct TALER_MINT_RefreshRevealHandle */ struct MAC_DownloadBuffer db; + /** + * Actual information about the melt operation. + */ + struct MeltData *md; }; @@ -459,6 +798,7 @@ TALER_MINT_refresh_reveal (struct TALER_MINT_Handle *mint, json_t *reveal_obj; CURL *eh; struct TALER_MINT_Context *ctx; + struct MeltData *md; if (GNUNET_YES != MAH_handle_is_ready (mint)) @@ -466,7 +806,13 @@ TALER_MINT_refresh_reveal (struct TALER_MINT_Handle *mint, GNUNET_break (0); return NULL; } - /* FIXME: parse "refresh_data" */ + md = deserialize_melt_data (refresh_data, + refresh_data_length); + if (NULL == md) + { + GNUNET_break (0); + return NULL; + } /* FIXME: totally bogus request building here: */ reveal_obj = json_pack ("{s:o, s:O}", /* f/wire */ @@ -477,7 +823,7 @@ TALER_MINT_refresh_reveal (struct TALER_MINT_Handle *mint, rrh->mint = mint; rrh->reveal_cb = reveal_cb; rrh->reveal_cb_cls = reveal_cb_cls; - + rrh->md = md; rrh->url = MAH_path_to_url (rrh->mint, "/refresh/reveal"); @@ -533,6 +879,8 @@ TALER_MINT_refresh_reveal_cancel (struct TALER_MINT_RefreshRevealHandle *rrh) GNUNET_free_non_null (rrh->db.buf); GNUNET_free (rrh->url); GNUNET_free (rrh->json_enc); + free_melt_data (rrh->md); /* does not free 'md' itself */ + GNUNET_free (rrh->md); GNUNET_free (rrh); }