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age-withdraw: Need BlindedPlanchet

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This commit is contained in:
Özgür Kesim 2023-03-20 12:48:41 +01:00
parent 838f6b7f1d
commit 983111e5e4
Signed by: oec
GPG Key ID: 3D76A56D79EDD9D7
1 changed files with 146 additions and 31 deletions
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177
src/exchange/taler-exchange-httpd_age-withdraw_reveal.c
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@ -74,9 +74,9 @@ struct AgeRevealContext
struct TALER_Amount total_fee;
/**
* #num_coins hashes of blinded coins.
* #num_coins hashes of blinded coin planchets.
*/
struct TALER_BlindedCoinHashP *coin_evs;
struct TALER_BlindedPlanchet *coin_evs;
/**
* secrets for #num_coins*(kappa - 1) disclosed coins.
@ -90,6 +90,39 @@ struct AgeRevealContext
struct TALER_EXCHANGEDB_AgeWithdrawCommitment commitment;
};
/**
* Information per planchet in the batch.
*/
struct PlanchetContext
{
/**
* Hash of the (blinded) message to be signed by the Exchange.
*/
struct TALER_BlindedCoinHashP h_coin_envelope;
/**
* Value of the coin being exchanged (matching the denomination key)
* plus the transaction fee. We include this in what is being
* signed so that we can verify a reserve's remaining total balance
* without needing to access the respective denomination key
* information each time.
*/
struct TALER_Amount amount_with_fee;
/**
* Blinded planchet.
*/
struct TALER_BlindedPlanchet blinded_planchet;
/**
* Set to the resulting signed coin data to be returned to the client.
*/
struct TALER_EXCHANGEDB_CollectableBlindcoin collectable;
};
/**
* Helper function to free resources in the context
*/
@ -198,11 +231,11 @@ parse_age_withdraw_reveal_json (
/* Parse blinded envelopes */
actx->coin_evs = GNUNET_new_array (actx->num_coins,
struct TALER_BlindedCoinHashP);
struct TALER_BlindedPlanchet);
json_array_foreach (j_coin_evs, idx, value) {
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto (NULL, &actx->coin_evs[idx]),
TALER_JSON_spec_blinded_planchet (NULL, &actx->coin_evs[idx]),
GNUNET_JSON_spec_end ()
};
@ -414,6 +447,7 @@ denomination_is_valid (
* @param connection The HTTP connection to the client
* @param len The lengths of the array @a denoms_h
* @param denoms_h array of hashes of denomination public keys
* @param coin_evs array of blinded coin planchets
* @param[out] dks On success, will be filled with the denomination keys. Caller must deallocate.
* @param amount_with_fee The committed amount including fees
* @param[out] total_amount On success, will contain the total sum of all denominations
@ -427,6 +461,7 @@ are_denominations_valid (
struct MHD_Connection *connection,
uint32_t len,
const struct TALER_DenominationHashP *denoms_h,
const struct TALER_BlindedPlanchet *coin_evs,
struct TEH_DenominationKey **dks,
const struct TALER_Amount *amount_with_fee,
struct TALER_Amount *total_amount,
@ -458,7 +493,16 @@ are_denominations_valid (
&denoms_h[i],
dks[i],
result))
return GNUNET_SYSERR;
/* Ensure the ciphers from the planchets match the denominations' */
if (dks[i]->denom_pub.cipher != coin_evs[i].cipher)
{
GNUNET_break_op (0);
*result = TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_GENERIC_CIPHER_MISMATCH,
NULL);
return GNUNET_SYSERR;
}
@ -468,9 +512,9 @@ are_denominations_valid (
total_amount,
&dks[i]->meta.value))
{
GNUNET_break (0);
GNUNET_break_op (0);
*result = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_AGE_WITHDRAW_AMOUNT_OVERFLOW,
"amount");
return GNUNET_SYSERR;
@ -482,9 +526,9 @@ are_denominations_valid (
total_fee,
&dks[i]->meta.fees.withdraw))
{
GNUNET_break (0);
GNUNET_break_op (0);
*result = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_AGE_WITHDRAW_AMOUNT_OVERFLOW,
"fee");
return GNUNET_SYSERR;
@ -504,9 +548,10 @@ are_denominations_valid (
if (0 != TALER_amount_cmp (&sum, amount_with_fee))
{
GNUNET_break_op (0);
*result = TALER_MHD_reply_with_ec (connection,
TALER_EC_EXCHANGE_AGE_WITHDRAW_AMOUNT_INCORRECT,
NULL);
*result = TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_AGE_WITHDRAW_AMOUNT_INCORRECT,
NULL);
return GNUNET_SYSERR;
}
}
@ -537,7 +582,7 @@ are_denominations_valid (
* @param max_age Maximum age allowed for the age restriction
* @param noreveal_idx Index that was given to the client in response to the age-withdraw request
* @param num_coins Number of coins
* @param coin_evs The Hashes of the undisclosed, blinded coins, @a num_coins many
* @param coin_evs The blindet planchets of the undisclosed coins, @a num_coins many
* @param denom_keys The array of denomination keys, @a num_coins. Needed to detect Clause-Schnorr-based denominations
* @param disclosed_coin_secrets The secrets of the disclosed coins, (TALER_CNC_KAPPA - 1)*num_coins many
* @param[out] result On error, a HTTP-response will be queued and result set accordingly
@ -550,7 +595,7 @@ verify_commitment_and_max_age (
const uint32_t max_age,
const uint32_t noreveal_idx,
const uint32_t num_coins,
const struct TALER_BlindedCoinHashP *coin_evs,
const struct TALER_BlindedPlanchet *coin_evs,
const struct TEH_DenominationKey *denom_keys,
const struct TALER_PlanchetMasterSecretP *disclosed_coin_secrets,
MHD_RESULT *result)
@ -636,14 +681,19 @@ verify_commitment_and_max_age (
.nonce = &nonce,
};
ec = TEH_keys_denomination_cs_r_pub (&cdd,
false,
&alg_values.details.
cs_values);
ec = TEH_keys_denomination_cs_r_pub (
&cdd,
false,
&alg_values.details.cs_values);
#pragma message ("FIXME:oec: return value of needs handling!")
/* FIXME:oec: Handle error */
GNUNET_assert (TALER_EC_NONE == ec);
if (TALER_EC_NONE != ec)
{
GNUNET_break_op (0);
*result = TALER_MHD_reply_with_ec (connection,
ec,
NULL);
return GNUNET_SYSERR;
}
}
}
@ -722,6 +772,64 @@ verify_commitment_and_max_age (
}
/**
* @brief Executes the database transaction for the withdraw of coins and signs
* the blinded coins
*
* @param connection The HTTP-connection to the client
* @param h_commitment_orig The commitment from the age-withdraw request
* @param num_coins The number of coins (and also denominations)
* @param coin_evs The blinded planchets of the coins
* @param denom_keys The corresponding denominations
* @param[out] result On error, a HTTP-response will be queued and result set accordingly
* @return GNUNET_OK on success, GNUNET_SYSERR otherwise
*/
enum GNUNET_GenericReturnValue
finalize_withdraw_and_sign (
struct MHD_Connection *connection,
const struct TALER_AgeWithdrawCommitmentHashP *h_commitment,
const uint32_t num_coins,
const struct TALER_BlindedPlanchet *coin_evs,
const struct TEH_DenominationKey *denom_keys,
MHD_RESULT *result)
{
enum GNUNET_GenericReturnValue ret = GNUNET_SYSERR;
struct TEH_CoinSignData csds[num_coins];
struct TALER_BlindedDenominationSignature bss[num_coins];
for (uint32_t i = 0; i<num_coins; i++)
{
csds[i].h_denom_pub = &denom_keys[i].h_denom_pub;
csds[i].bp = &coin_evs[i];
}
/* First, sign the keys */
{
enum TALER_ErrorCode ec;
ec = TEH_keys_denomination_batch_sign (
csds,
num_coins,
false,
bss);
if (TALER_EC_NONE != ec)
{
GNUNET_break (0);
*result = TALER_MHD_reply_with_ec (connection,
ec,
NULL);
return GNUNET_SYSERR;
}
}
/* Then, execute the transaction */
#pragma message ("FIXME:oec implement finalize_withdraw_and_sign()")
return ret;
}
MHD_RESULT
TEH_handler_age_withdraw_reveal (
struct TEH_RequestContext *rc,
@ -745,15 +853,13 @@ TEH_handler_age_withdraw_reveal (
actx.ach = *ach;
/* Parse JSON body*/
ret = TALER_MHD_parse_json_data (rc->connection,
root,
spec);
if (GNUNET_OK != ret)
{
ret = TALER_MHD_parse_json_data (rc->connection,
root,
spec);
if (GNUNET_OK != ret)
{
GNUNET_break_op (0);
return (GNUNET_SYSERR == ret) ? MHD_NO : MHD_YES;
}
GNUNET_break_op (0);
return (GNUNET_SYSERR == ret) ? MHD_NO : MHD_YES;
}
@ -782,6 +888,7 @@ TEH_handler_age_withdraw_reveal (
rc->connection,
actx.num_coins,
actx.denoms_h,
actx.coin_evs,
&actx.denom_keys,
&actx.commitment.amount_with_fee,
&actx.total_amount,
@ -789,8 +896,8 @@ TEH_handler_age_withdraw_reveal (
&result))
break;
/* Verify the computed h_commitment equals the committed one and that
* coins have a maximum age group corresponding max_age (age-mask dependent) */
/* Verify the computed h_commitment equals the committed one and that coins
* have a maximum age group corresponding max_age (age-mask dependent) */
if (GNUNET_OK != verify_commitment_and_max_age (
rc->connection,
&actx.commitment.h_commitment,
@ -803,7 +910,15 @@ TEH_handler_age_withdraw_reveal (
&result))
break;
/* TODO:oec: sign the coins */
/* Do the withdraw in the DB and sign the coins */
if (GNUNET_OK != finalize_withdraw_and_sign (
rc->connection,
&actx.commitment.h_commitment,
actx.num_coins,
actx.coin_evs,
actx.denom_keys,
&result))
break;
} while(0);