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authorChristian Grothoff <christian@grothoff.org>2016-06-07 15:14:44 +0200
committerChristian Grothoff <christian@grothoff.org>2016-06-07 15:14:44 +0200
commit166352e87e59f8525b501f87c5ecc3fce182835d (patch)
tree184e20baaceacaf6b1a542a0f6f1068f35dcc3dd
parente5894fac26def8fb1663056b73c8407c40f543c1 (diff)
downloadexchange-166352e87e59f8525b501f87c5ecc3fce182835d.tar.gz
exchange-166352e87e59f8525b501f87c5ecc3fce182835d.tar.bz2
exchange-166352e87e59f8525b501f87c5ecc3fce182835d.zip
add exchange_pub to callbacks
-rw-r--r--ChangeLog5
-rw-r--r--src/benchmark/taler-exchange-benchmark.c2
-rw-r--r--src/exchange-lib/exchange_api_deposit.c22
-rw-r--r--src/exchange-lib/exchange_api_deposit_wtid.c21
-rw-r--r--src/exchange-lib/exchange_api_refresh.c15
-rw-r--r--src/exchange-lib/exchange_api_refund.c21
-rw-r--r--src/exchange-lib/exchange_api_wire_deposits.c2
-rw-r--r--src/exchange-lib/test_exchange_api.c10
-rw-r--r--src/include/taler_exchange_service.h10
9 files changed, 85 insertions, 23 deletions
diff --git a/ChangeLog b/ChangeLog
index c7ee8017..24d9badc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,2 +1,7 @@
+Tue Jun 7 15:13:46 CEST 2016
+ Adding public key of the exchange that was used to sign replies
+ to applicable callbacks of libtalerexchange. (This will eventually
+ be needed by the merchant's backend.) -CG
+
Wed Jun 1 17:27:36 CEST 2016
Releasing taler-exchange 0.0.0. -CG
diff --git a/src/benchmark/taler-exchange-benchmark.c b/src/benchmark/taler-exchange-benchmark.c
index 7e19d831..53c49df8 100644
--- a/src/benchmark/taler-exchange-benchmark.c
+++ b/src/benchmark/taler-exchange-benchmark.c
@@ -222,12 +222,14 @@ fail (const char *msg)
* @param cls closure with the interpreter state
* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful deposit;
* 0 if the exchange's reply is bogus (fails to follow the protocol)
+ * @param exchange_pub public key used by the exchange for signing
* @param obj the received JSON reply, should be kept as proof (and, in case of errors,
* be forwarded to the customer)
*/
static void
deposit_cb (void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *exchange_pub,
const json_t *obj)
{
unsigned int coin_index = (unsigned int) (long) cls;
diff --git a/src/exchange-lib/exchange_api_deposit.c b/src/exchange-lib/exchange_api_deposit.c
index 4d13febf..e65684ac 100644
--- a/src/exchange-lib/exchange_api_deposit.c
+++ b/src/exchange-lib/exchange_api_deposit.c
@@ -94,18 +94,20 @@ struct TALER_EXCHANGE_DepositHandle
*
* @param dh deposit handle
* @param json json reply with the signature
+ * @param exchange_pub set to the exchange's public key
* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
*/
static int
verify_deposit_signature_ok (const struct TALER_EXCHANGE_DepositHandle *dh,
- const json_t *json)
+ const json_t *json,
+ struct TALER_ExchangePublicKeyP *exchange_pub)
{
struct TALER_ExchangeSignatureP exchange_sig;
- struct TALER_ExchangePublicKeyP exchange_pub;
+
const struct TALER_EXCHANGE_Keys *key_state;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("sig", &exchange_sig),
- GNUNET_JSON_spec_fixed_auto ("pub", &exchange_pub),
+ GNUNET_JSON_spec_fixed_auto ("pub", exchange_pub),
GNUNET_JSON_spec_end()
};
@@ -120,7 +122,7 @@ verify_deposit_signature_ok (const struct TALER_EXCHANGE_DepositHandle *dh,
key_state = TALER_EXCHANGE_get_keys (dh->exchange);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (key_state,
- &exchange_pub))
+ exchange_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
@@ -129,7 +131,7 @@ verify_deposit_signature_ok (const struct TALER_EXCHANGE_DepositHandle *dh,
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT,
&dh->depconf.purpose,
&exchange_sig.eddsa_signature,
- &exchange_pub.eddsa_pub))
+ &exchange_pub->eddsa_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
@@ -200,6 +202,8 @@ handle_deposit_finished (void *cls,
const json_t *json)
{
struct TALER_EXCHANGE_DepositHandle *dh = cls;
+ struct TALER_ExchangePublicKeyP exchange_pub;
+ struct TALER_ExchangePublicKeyP *ep = NULL;
dh->job = NULL;
switch (response_code)
@@ -209,11 +213,16 @@ handle_deposit_finished (void *cls,
case MHD_HTTP_OK:
if (GNUNET_OK !=
verify_deposit_signature_ok (dh,
- json))
+ json,
+ &exchange_pub))
{
GNUNET_break_op (0);
response_code = 0;
}
+ else
+ {
+ ep = &exchange_pub;
+ }
break;
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or the exchange is buggy
@@ -253,6 +262,7 @@ handle_deposit_finished (void *cls,
}
dh->cb (dh->cb_cls,
response_code,
+ ep,
json);
TALER_EXCHANGE_deposit_cancel (dh);
}
diff --git a/src/exchange-lib/exchange_api_deposit_wtid.c b/src/exchange-lib/exchange_api_deposit_wtid.c
index 073ce2b3..66b91413 100644
--- a/src/exchange-lib/exchange_api_deposit_wtid.c
+++ b/src/exchange-lib/exchange_api_deposit_wtid.c
@@ -84,18 +84,19 @@ struct TALER_EXCHANGE_DepositWtidHandle
*
* @param dwh deposit wtid handle
* @param json json reply with the signature
+ * @param[out] exchange_pub set to the exchange's public key
* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
*/
static int
verify_deposit_wtid_signature_ok (const struct TALER_EXCHANGE_DepositWtidHandle *dwh,
- const json_t *json)
+ const json_t *json,
+ struct TALER_ExchangePublicKeyP *exchange_pub)
{
struct TALER_ExchangeSignatureP exchange_sig;
- struct TALER_ExchangePublicKeyP exchange_pub;
const struct TALER_EXCHANGE_Keys *key_state;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
- GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub),
+ GNUNET_JSON_spec_fixed_auto ("exchange_pub", exchange_pub),
GNUNET_JSON_spec_end()
};
@@ -110,7 +111,7 @@ verify_deposit_wtid_signature_ok (const struct TALER_EXCHANGE_DepositWtidHandle
key_state = TALER_EXCHANGE_get_keys (dwh->exchange);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (key_state,
- &exchange_pub))
+ exchange_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
@@ -119,7 +120,7 @@ verify_deposit_wtid_signature_ok (const struct TALER_EXCHANGE_DepositWtidHandle
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE,
&dwh->depconf.purpose,
&exchange_sig.eddsa_signature,
- &exchange_pub.eddsa_pub))
+ &exchange_pub->eddsa_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
@@ -146,6 +147,8 @@ handle_deposit_wtid_finished (void *cls,
struct GNUNET_TIME_Absolute execution_time = GNUNET_TIME_UNIT_FOREVER_ABS;
const struct TALER_Amount *coin_contribution = NULL;
struct TALER_Amount coin_contribution_s;
+ struct TALER_ExchangePublicKeyP exchange_pub;
+ struct TALER_ExchangePublicKeyP *ep = NULL;
dwh->job = NULL;
switch (response_code)
@@ -177,11 +180,16 @@ handle_deposit_wtid_finished (void *cls,
coin_contribution = &coin_contribution_s;
if (GNUNET_OK !=
verify_deposit_wtid_signature_ok (dwh,
- json))
+ json,
+ &exchange_pub))
{
GNUNET_break_op (0);
response_code = 0;
}
+ else
+ {
+ ep = &exchange_pub;
+ }
}
break;
case MHD_HTTP_ACCEPTED:
@@ -231,6 +239,7 @@ handle_deposit_wtid_finished (void *cls,
}
dwh->cb (dwh->cb_cls,
response_code,
+ ep,
json,
wtid,
execution_time,
diff --git a/src/exchange-lib/exchange_api_refresh.c b/src/exchange-lib/exchange_api_refresh.c
index 7e207d79..b86e5836 100644
--- a/src/exchange-lib/exchange_api_refresh.c
+++ b/src/exchange-lib/exchange_api_refresh.c
@@ -951,20 +951,21 @@ struct TALER_EXCHANGE_RefreshMeltHandle
*
* @param rmh melt handle
* @param json json reply with the signature
+ * @param[out] exchange_pub public key of the exchange used for the signature
* @param[out] noreveal_index set to the noreveal index selected by the exchange
* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
*/
static int
verify_refresh_melt_signature_ok (struct TALER_EXCHANGE_RefreshMeltHandle *rmh,
const json_t *json,
+ struct TALER_ExchangePublicKeyP *exchange_pub,
uint16_t *noreveal_index)
{
struct TALER_ExchangeSignatureP exchange_sig;
- struct TALER_ExchangePublicKeyP exchange_pub;
const struct TALER_EXCHANGE_Keys *key_state;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
- GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub),
+ GNUNET_JSON_spec_fixed_auto ("exchange_pub", exchange_pub),
GNUNET_JSON_spec_uint16 ("noreveal_index", noreveal_index),
GNUNET_JSON_spec_end()
};
@@ -983,7 +984,7 @@ verify_refresh_melt_signature_ok (struct TALER_EXCHANGE_RefreshMeltHandle *rmh,
key_state = TALER_EXCHANGE_get_keys (rmh->exchange);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (key_state,
- &exchange_pub))
+ exchange_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
@@ -1006,7 +1007,7 @@ verify_refresh_melt_signature_ok (struct TALER_EXCHANGE_RefreshMeltHandle *rmh,
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_MELT,
&confirm.purpose,
&exchange_sig.eddsa_signature,
- &exchange_pub.eddsa_pub))
+ &exchange_pub->eddsa_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
@@ -1126,6 +1127,7 @@ handle_refresh_melt_finished (void *cls,
{
struct TALER_EXCHANGE_RefreshMeltHandle *rmh = cls;
uint16_t noreveal_index = TALER_CNC_KAPPA; /* invalid value */
+ struct TALER_ExchangePublicKeyP exchange_pub;
rmh->job = NULL;
switch (response_code)
@@ -1136,6 +1138,7 @@ handle_refresh_melt_finished (void *cls,
if (GNUNET_OK !=
verify_refresh_melt_signature_ok (rmh,
json,
+ &exchange_pub,
&noreveal_index))
{
GNUNET_break_op (0);
@@ -1146,6 +1149,7 @@ handle_refresh_melt_finished (void *cls,
rmh->melt_cb (rmh->melt_cb_cls,
response_code,
noreveal_index,
+ (0 == response_code) ? NULL : &exchange_pub,
json);
rmh->melt_cb = NULL;
}
@@ -1190,6 +1194,7 @@ handle_refresh_melt_finished (void *cls,
rmh->melt_cb (rmh->melt_cb_cls,
response_code,
UINT16_MAX,
+ NULL,
json);
TALER_EXCHANGE_refresh_melt_cancel (rmh);
}
@@ -1731,7 +1736,7 @@ TALER_EXCHANGE_refresh_reveal (struct TALER_EXCHANGE_Handle *exchange,
struct GNUNET_CURL_Context *ctx;
struct MeltData *md;
unsigned int j;
-
+
GNUNET_assert (GNUNET_YES ==
MAH_handle_is_ready (exchange));
md = deserialize_melt_data (refresh_data,
diff --git a/src/exchange-lib/exchange_api_refund.c b/src/exchange-lib/exchange_api_refund.c
index d622ddc7..fff03acf 100644
--- a/src/exchange-lib/exchange_api_refund.c
+++ b/src/exchange-lib/exchange_api_refund.c
@@ -83,18 +83,19 @@ struct TALER_EXCHANGE_RefundHandle
*
* @param rh refund handle
* @param json json reply with the signature
+ * @param[out] exchange_pub set to the exchange's public key
* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
*/
static int
verify_refund_signature_ok (const struct TALER_EXCHANGE_RefundHandle *rh,
- const json_t *json)
+ const json_t *json,
+ struct TALER_ExchangePublicKeyP *exchange_pub)
{
struct TALER_ExchangeSignatureP exchange_sig;
- struct TALER_ExchangePublicKeyP exchange_pub;
const struct TALER_EXCHANGE_Keys *key_state;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("sig", &exchange_sig),
- GNUNET_JSON_spec_fixed_auto ("pub", &exchange_pub),
+ GNUNET_JSON_spec_fixed_auto ("pub", exchange_pub),
GNUNET_JSON_spec_end()
};
@@ -109,7 +110,7 @@ verify_refund_signature_ok (const struct TALER_EXCHANGE_RefundHandle *rh,
key_state = TALER_EXCHANGE_get_keys (rh->exchange);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (key_state,
- &exchange_pub))
+ exchange_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
@@ -118,7 +119,7 @@ verify_refund_signature_ok (const struct TALER_EXCHANGE_RefundHandle *rh,
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_REFUND,
&rh->depconf.purpose,
&exchange_sig.eddsa_signature,
- &exchange_pub.eddsa_pub))
+ &exchange_pub->eddsa_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
@@ -141,6 +142,8 @@ handle_refund_finished (void *cls,
const json_t *json)
{
struct TALER_EXCHANGE_RefundHandle *rh = cls;
+ struct TALER_ExchangePublicKeyP exchange_pub;
+ struct TALER_ExchangePublicKeyP *ep = NULL;
rh->job = NULL;
switch (response_code)
@@ -150,11 +153,16 @@ handle_refund_finished (void *cls,
case MHD_HTTP_OK:
if (GNUNET_OK !=
verify_refund_signature_ok (rh,
- json))
+ json,
+ &exchange_pub))
{
GNUNET_break_op (0);
response_code = 0;
}
+ else
+ {
+ ep = &exchange_pub;
+ }
break;
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or the exchange is buggy
@@ -188,6 +196,7 @@ handle_refund_finished (void *cls,
}
rh->cb (rh->cb_cls,
response_code,
+ ep,
json);
TALER_EXCHANGE_refund_cancel (rh);
}
diff --git a/src/exchange-lib/exchange_api_wire_deposits.c b/src/exchange-lib/exchange_api_wire_deposits.c
index 0601f9b4..91e2aef7 100644
--- a/src/exchange-lib/exchange_api_wire_deposits.c
+++ b/src/exchange-lib/exchange_api_wire_deposits.c
@@ -186,6 +186,7 @@ handle_wire_deposits_finished (void *cls,
break;
wdh->cb (wdh->cb_cls,
response_code,
+ &exchange_pub,
json,
&h_wire,
&total_amount,
@@ -224,6 +225,7 @@ handle_wire_deposits_finished (void *cls,
}
wdh->cb (wdh->cb_cls,
response_code,
+ NULL,
json,
NULL, NULL, 0, NULL);
TALER_EXCHANGE_wire_deposits_cancel (wdh);
diff --git a/src/exchange-lib/test_exchange_api.c b/src/exchange-lib/test_exchange_api.c
index 75a9cfbd..83fb0eb3 100644
--- a/src/exchange-lib/test_exchange_api.c
+++ b/src/exchange-lib/test_exchange_api.c
@@ -1028,12 +1028,14 @@ reserve_withdraw_cb (void *cls,
* @param cls closure with the interpreter state
* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful deposit;
* 0 if the exchange's reply is bogus (fails to follow the protocol)
+ * @param exchange_pub public key the exchange used for signing
* @param obj the received JSON reply, should be kept as proof (and, in case of errors,
* be forwarded to the customer)
*/
static void
deposit_cb (void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *exchange_pub,
const json_t *obj)
{
struct InterpreterState *is = cls;
@@ -1062,12 +1064,14 @@ deposit_cb (void *cls,
* 0 if the exchange's reply is bogus (fails to follow the protocol)
* @param noreveal_index choice by the exchange in the cut-and-choose protocol,
* UINT16_MAX on error
+ * @param exchange_pub public key the exchange used for signing
* @param full_response full response from the exchange (for logging, in case of errors)
*/
static void
melt_cb (void *cls,
unsigned int http_status,
uint16_t noreveal_index,
+ const struct TALER_ExchangePublicKeyP *exchange_pub,
const json_t *full_response)
{
struct InterpreterState *is = cls;
@@ -1388,6 +1392,7 @@ wire_cb (void *cls,
*
* @param cls closure
* @param http_status HTTP status code we got, 0 on exchange protocol violation
+ * @param exchange_pub public key the exchange used for signing
* @param json original json reply (may include signatures, those have then been
* validated already)
* @param wtid extracted wire transfer identifier, or NULL if the exchange could
@@ -1400,6 +1405,7 @@ wire_cb (void *cls,
static void
wire_deposits_cb (void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *exchange_pub,
const json_t *json,
const struct GNUNET_HashCode *h_wire,
const struct TALER_Amount *total_amount,
@@ -1515,6 +1521,7 @@ wire_deposits_cb (void *cls,
*
* @param cls closure
* @param http_status HTTP status code we got, 0 on exchange protocol violation
+ * @param exchange_pub public key the exchange used for signing
* @param json original json reply (may include signatures, those have then been
* validated already)
* @param wtid wire transfer identifier used by the exchange, NULL if exchange did not
@@ -1527,6 +1534,7 @@ wire_deposits_cb (void *cls,
static void
deposit_wtid_cb (void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *exchange_pub,
const json_t *json,
const struct TALER_WireTransferIdentifierRawP *wtid,
struct GNUNET_TIME_Absolute execution_time,
@@ -1580,12 +1588,14 @@ deposit_wtid_cb (void *cls,
* @param cls closure
* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful deposit;
* 0 if the exchange's reply is bogus (fails to follow the protocol)
+ * @param exchange_pub public key the exchange used for signing @a obj
* @param obj the received JSON reply, should be kept as proof (and, in particular,
* be forwarded to the customer)
*/
static void
refund_cb (void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *exchange_pub,
const json_t *obj)
{
struct InterpreterState *is = cls;
diff --git a/src/include/taler_exchange_service.h b/src/include/taler_exchange_service.h
index e65a9fae..5f79b9be 100644
--- a/src/include/taler_exchange_service.h
+++ b/src/include/taler_exchange_service.h
@@ -416,12 +416,14 @@ struct TALER_EXCHANGE_DepositHandle;
* @param cls closure
* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful deposit;
* 0 if the exchange's reply is bogus (fails to follow the protocol)
+ * @param sign_key exchange key used to sign @a obj, or NULL
* @param obj the received JSON reply, should be kept as proof (and, in case of errors,
* be forwarded to the customer)
*/
typedef void
(*TALER_EXCHANGE_DepositResultCallback) (void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *sign_key,
const json_t *obj);
@@ -502,12 +504,14 @@ struct TALER_EXCHANGE_RefundHandle;
* @param cls closure
* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful deposit;
* 0 if the exchange's reply is bogus (fails to follow the protocol)
+ * @param sign_key exchange key used to sign @a obj, or NULL
* @param obj the received JSON reply, should be kept as proof (and, in particular,
* be forwarded to the customer)
*/
typedef void
(*TALER_EXCHANGE_RefundResultCallback) (void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *sign_key,
const json_t *obj);
@@ -833,12 +837,14 @@ struct TALER_EXCHANGE_RefreshMeltHandle;
* 0 if the exchange's reply is bogus (fails to follow the protocol)
* @param noreveal_index choice by the exchange in the cut-and-choose protocol,
* UINT16_MAX on error
+ * @param sign_key exchange key used to sign @a full_response, or NULL
* @param full_response full response from the exchange (for logging, in case of errors)
*/
typedef void
(*TALER_EXCHANGE_RefreshMeltCallback) (void *cls,
unsigned int http_status,
uint16_t noreveal_index,
+ const struct TALER_ExchangePublicKeyP *sign_key,
const json_t *full_response);
@@ -1135,6 +1141,7 @@ struct TALER_WireDepositDetails
*
* @param cls closure
* @param http_status HTTP status code we got, 0 on exchange protocol violation
+ * @param sign_key exchange key used to sign @a json, or NULL
* @param json original json reply (may include signatures, those have then been
* validated already)
* @param wtid extracted wire transfer identifier, or NULL if the exchange could
@@ -1147,6 +1154,7 @@ struct TALER_WireDepositDetails
typedef void
(*TALER_EXCHANGE_WireDepositsCallback)(void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *sign_key,
const json_t *json,
const struct GNUNET_HashCode *h_wire,
const struct TALER_Amount *total_amount,
@@ -1195,6 +1203,7 @@ struct TALER_EXCHANGE_DepositWtidHandle;
*
* @param cls closure
* @param http_status HTTP status code we got, 0 on exchange protocol violation
+ * @param sign_key exchange key used to sign @a json, or NULL
* @param json original json reply (may include signatures, those have then been
* validated already)
* @param wtid wire transfer identifier used by the exchange, NULL if exchange did not
@@ -1205,6 +1214,7 @@ struct TALER_EXCHANGE_DepositWtidHandle;
typedef void
(*TALER_EXCHANGE_DepositWtidCallback)(void *cls,
unsigned int http_status,
+ const struct TALER_ExchangePublicKeyP *sign_key,
const json_t *json,
const struct TALER_WireTransferIdentifierRawP *wtid,
struct GNUNET_TIME_Absolute execution_time,