From ecea165db778755851d4eb467606bfcb24ce6e56 Mon Sep 17 00:00:00 2001 From: Özgür Kesim Date: Sat, 15 Jul 2023 09:39:01 +0200 Subject: [age-withdraw] age-withdraw-reveal lib-API mostly finished --- src/lib/exchange_api_age_withdraw_reveal.c | 171 +++++++++++++++++++++++------ 1 file changed, 138 insertions(+), 33 deletions(-) (limited to 'src/lib/exchange_api_age_withdraw_reveal.c') diff --git a/src/lib/exchange_api_age_withdraw_reveal.c b/src/lib/exchange_api_age_withdraw_reveal.c index 7ddb291f9..9803be28c 100644 --- a/src/lib/exchange_api_age_withdraw_reveal.c +++ b/src/lib/exchange_api_age_withdraw_reveal.c @@ -47,6 +47,9 @@ struct TALER_EXCHANGE_AgeWithdrawRevealHandle /* The age-withdraw commitment */ struct TALER_AgeWithdrawCommitmentHashP h_commitment; + /* The maximum age */ + uint8_t max_age; + /* Number of coins */ size_t num_coins; @@ -57,9 +60,6 @@ struct TALER_EXCHANGE_AgeWithdrawRevealHandle * previous call to /age-withdraw. */ const struct TALER_ExchangeWithdrawValues *alg_values; - /* The curl context for the request */ - struct GNUNET_CURL_Context *curl_ctx; - /* The url for the reveal request */ const char *request_url; @@ -81,6 +81,82 @@ struct TALER_EXCHANGE_AgeWithdrawRevealHandle }; +static enum GNUNET_GenericReturnValue +reveal_coin ( + const struct TALER_PlanchetMasterSecretP *secret, + const struct TALER_DenominationPublicKey *denom_pub, + const struct TALER_ExchangeWithdrawValues *alg_values, + const struct TALER_BlindedDenominationSignature *blind_sig, + uint8_t max_age, + struct TALER_EXCHANGE_RevealedCoinInfo *revealed_coin) +{ + enum GNUNET_GenericReturnValue ret = GNUNET_SYSERR; + +#define BREAK_ON_FAILURE(call) \ + do { \ + if (GNUNET_OK != (call)) { GNUNET_break (0); break; } \ + } while(0) + + do { + struct TALER_CoinPubHashP h_coin_pub; + struct TALER_PlanchetDetail planchet_detail; + const struct TALER_AgeCommitmentHash *hac = NULL; + struct TALER_FreshCoin fresh_coin; + + TALER_planchet_setup_coin_priv (secret, + alg_values, + &revealed_coin->coin_priv); + + TALER_planchet_blinding_secret_create (secret, + alg_values, + &revealed_coin->bks); + + revealed_coin->age_commitment_proof = NULL; + if (0 < max_age) + { + BREAK_ON_FAILURE ( + TALER_age_restriction_from_secret ( + secret, + &denom_pub->age_mask, + max_age, + revealed_coin->age_commitment_proof)); + + TALER_age_commitment_hash ( + &revealed_coin->age_commitment_proof->commitment, + &revealed_coin->h_age_commitment); + + hac = &revealed_coin->h_age_commitment; + } + + BREAK_ON_FAILURE ( + TALER_planchet_prepare (denom_pub, + alg_values, + &revealed_coin->bks, + &revealed_coin->coin_priv, + hac, + &h_coin_pub, + &planchet_detail)); + + BREAK_ON_FAILURE ( + TALER_planchet_to_coin (denom_pub, + blind_sig, + &revealed_coin->bks, + &revealed_coin->coin_priv, + &revealed_coin->h_age_commitment, + &h_coin_pub, + alg_values, + &fresh_coin)); + + /* success */ + revealed_coin->sig = fresh_coin.sig; + ret = GNUNET_OK; + } while(0); + + return ret; +#undef BREAK_ON_FAILURE +} + + /** * We got a 200 OK response for the /age-withdraw/$ACH/reveal operation. * Extract the signed blindedcoins and return it to the caller. @@ -94,9 +170,7 @@ struct TALER_EXCHANGE_AgeWithdrawRevealHandle static enum GNUNET_GenericReturnValue age_withdraw_reveal_ok ( struct TALER_EXCHANGE_AgeWithdrawRevealHandle *awrh, - const json_t *j_response, - size_t num_coins, - struct TALER_EXCHANGE_RevealedCoinInfo revealed_coins[static num_coins]) + const json_t *j_response) { struct TALER_EXCHANGE_AgeWithdrawRevealResponse response = { .hr.reply = j_response, @@ -109,35 +183,61 @@ age_withdraw_reveal_ok ( GNUNET_JSON_spec_end () }; - if (GNUNET_OK!= - GNUNET_JSON_parse (j_response, - spec, - NULL, NULL)) + if (GNUNET_OK != GNUNET_JSON_parse (j_response, + spec, + NULL, NULL)) { GNUNET_break_op (0); return GNUNET_SYSERR; } - GNUNET_assert (num_coins == awrh->num_coins); - if (num_coins != json_array_size (j_sigs)) + if (awrh->num_coins != json_array_size (j_sigs)) { /* Number of coins generated does not match our expectation */ GNUNET_break_op (0); return GNUNET_SYSERR; } - - for (size_t n = 0; n < num_coins; n++) { - // TODO[oec] extract the individual coins. - } + struct TALER_EXCHANGE_RevealedCoinInfo revealed_coins[awrh->num_coins]; - response.details.ok.num_coins = num_coins; - response.details.ok.revealed_coins = revealed_coins; - awrh->callback (awrh->callback_cls, - &response); - /* make sure the callback isn't called again */ - awrh->callback = NULL; + /* Reconstruct the coins and unblind the signatures */ + for (size_t n = 0; n < awrh->num_coins; n++) + { + enum GNUNET_GenericReturnValue ret; + struct TALER_BlindedDenominationSignature blinded_sig; + json_t *j_sig = json_array_get (j_sigs, n); + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_fixed_auto ("", &blinded_sig), + GNUNET_JSON_spec_end () + }; + + GNUNET_assert (NULL != j_sig); + if (GNUNET_OK != GNUNET_JSON_parse (j_sig, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + ret = reveal_coin (&awrh->coins_input[n].secrets[awrh->noreveal_index], + &awrh->coins_input[n].denom_pub->key, + &awrh->alg_values[n], + &blinded_sig, + awrh->max_age, + &revealed_coins[n]); + + if (GNUNET_OK != ret) + return ret; + } + + response.details.ok.num_coins = awrh->num_coins; + response.details.ok.revealed_coins = revealed_coins; + awrh->callback (awrh->callback_cls, + &response); + /* Make sure the callback isn't called again */ + awrh->callback = NULL; + } return GNUNET_OK; } @@ -165,6 +265,7 @@ handle_age_withdraw_reveal_finished ( }; awrh->job = NULL; + /* FIXME[oec]: Only handle response-codes that are in the spec */ switch (response_code) { case 0: @@ -173,12 +274,9 @@ handle_age_withdraw_reveal_finished ( case MHD_HTTP_OK: { enum GNUNET_GenericReturnValue ret; - struct TALER_EXCHANGE_RevealedCoinInfo revealed_coins[awrh->num_coins]; ret = age_withdraw_reveal_ok (awrh, - j_response, - awrh->num_coins, - revealed_coins); + j_response); if (GNUNET_OK != ret) { GNUNET_break_op (0); @@ -317,13 +415,14 @@ prepare_url ( /** * Call /age-withdraw/$ACH/reveal * + * @param curl_ctx The context for CURL * @param awrh The handler - * @param num_coins Number of coin candidates in reveal_inputs * @param reveal_inputs The secrets of the coin candidates */ static void perform_protocol ( + struct GNUNET_CURL_Context *curl_ctx, struct TALER_EXCHANGE_AgeWithdrawRevealHandle *awrh) { CURL *curlh = NULL; @@ -380,7 +479,7 @@ perform_protocol ( json_decref (j_request_body); j_request_body = NULL; - awrh->job = GNUNET_CURL_job_add2 (awrh->curl_ctx, + awrh->job = GNUNET_CURL_job_add2 (curl_ctx, curlh, awrh->post_ctx.headers, &handle_age_withdraw_reveal_finished, @@ -417,12 +516,12 @@ TALER_EXCHANGE_age_withdraw_reveal ( const struct TALER_ExchangeWithdrawValues alg_values[static num_coins], uint8_t noreveal_index, const struct TALER_AgeWithdrawCommitmentHashP *h_commitment, + uint8_t max_age, TALER_EXCHANGE_AgeWithdrawRevealCallback reveal_cb, void *reveal_cb_cls) { struct TALER_EXCHANGE_AgeWithdrawRevealHandle *awrh = GNUNET_new (struct TALER_EXCHANGE_AgeWithdrawRevealHandle); - awrh->curl_ctx = curl_ctx; awrh->noreveal_index = noreveal_index; awrh->callback = reveal_cb; awrh->callback_cls = reveal_cb_cls; @@ -430,6 +529,7 @@ TALER_EXCHANGE_age_withdraw_reveal ( awrh->num_coins = num_coins; awrh->coins_input = coins_input; awrh->alg_values = alg_values; + awrh->max_age = max_age; if (GNUNET_OK != @@ -437,7 +537,7 @@ TALER_EXCHANGE_age_withdraw_reveal ( awrh)) return NULL; - perform_protocol (awrh); + perform_protocol (curl_ctx, awrh); return awrh; } @@ -447,9 +547,14 @@ void TALER_EXCHANGE_age_withdraw_reveal_cancel ( struct TALER_EXCHANGE_AgeWithdrawRevealHandle *awrh) { - /* FIXME[oec] */ - (void) awrh; - #pragma message "need to implement TALER_EXCHANGE_age_withdraw_reveal_cancel" + if (NULL != awrh->job) + { + GNUNET_CURL_job_cancel (awrh->job); + awrh->job = NULL; + } + TALER_curl_easy_post_finished (&awrh->post_ctx); + /* FIXME[oec]: anything else left to cleanup!? */ + GNUNET_free (awrh); } -- cgit v1.2.3