/*
This file is part of TALER
(C) 2020, 2021 Taler Systems SA
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, see
*/
/**
* @file util/test_helper_cs.c
* @brief Tests for CS crypto helper
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_util.h"
/**
* Configuration has 1 minute duration and 5 minutes lookahead, but
* we do not get 'revocations' for expired keys. So this must be
* large enough to deal with key rotation during the runtime of
* the benchmark.
*/
#define MAX_KEYS 1024
/**
* How many random key revocations should we test?
*/
#define NUM_REVOKES 3
/**
* How many iterations of the successful signing test should we run?
*/
#define NUM_SIGN_TESTS 5
/**
* How many iterations of the successful signing test should we run
* during the benchmark phase?
*/
#define NUM_SIGN_PERFS 100
/**
* How many parallel clients should we use for the parallel
* benchmark? (> 500 may cause problems with the max open FD number limit).
*/
#define NUM_CORES 8
/**
* Number of keys currently in #keys.
*/
static unsigned int num_keys;
/**
* Keys currently managed by the helper.
*/
struct KeyData
{
/**
* Validity start point.
*/
struct GNUNET_TIME_Timestamp start_time;
/**
* Key expires for signing at @e start_time plus this value.
*/
struct GNUNET_TIME_Relative validity_duration;
/**
* Hash of the public key.
*/
struct TALER_CsPubHashP h_cs;
/**
* Full public key.
*/
struct TALER_DenominationPublicKey denom_pub;
/**
* Is this key currently valid?
*/
bool valid;
/**
* Did the test driver revoke this key?
*/
bool revoked;
};
/**
* Array of all the keys we got from the helper.
*/
static struct KeyData keys[MAX_KEYS];
/**
* Release memory occupied by #keys.
*/
static void
free_keys (void)
{
for (unsigned int i = 0; i 0);
num_keys--;
}
}
/**
* Function called with information about available keys for signing. Usually
* only called once per key upon connect. Also called again in case a key is
* being revoked, in that case with an @a end_time of zero. Stores the keys
* status in #keys.
*
* @param cls closure, NULL
* @param section_name name of the denomination type in the configuration;
* NULL if the key has been revoked or purged
* @param start_time when does the key become available for signing;
* zero if the key has been revoked or purged
* @param validity_duration how long does the key remain available for signing;
* zero if the key has been revoked or purged
* @param h_cs hash of the @a denom_pub that is available (or was purged)
* @param denom_pub the public key itself, NULL if the key was revoked or purged
* @param sm_pub public key of the security module, NULL if the key was revoked or purged
* @param sm_sig signature from the security module, NULL if the key was revoked or purged
* The signature was already verified against @a sm_pub.
*/
static void
key_cb (void *cls,
const char *section_name,
struct GNUNET_TIME_Timestamp start_time,
struct GNUNET_TIME_Relative validity_duration,
const struct TALER_CsPubHashP *h_cs,
const struct TALER_DenominationPublicKey *denom_pub,
const struct TALER_SecurityModulePublicKeyP *sm_pub,
const struct TALER_SecurityModuleSignatureP *sm_sig)
{
(void) cls;
(void) sm_pub;
(void) sm_sig;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Key notification about key %s in `%s'\n",
GNUNET_h2s (&h_cs->hash),
section_name);
if (0 == validity_duration.rel_value_us)
{
bool found = false;
GNUNET_break (NULL == denom_pub);
GNUNET_break (NULL == section_name);
for (unsigned int i = 0; i 0);
num_keys--;
found = true;
break;
}
if (! found)
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Error: helper announced expiration of unknown key!\n");
return;
}
GNUNET_break (NULL != denom_pub);
for (unsigned int i = 0; i,
GNUNET_TIME_UNIT_SECONDS))
{
/* key worked too early */
GNUNET_break (0);
return 4;
}
if (GNUNET_TIME_relative_cmp (GNUNET_TIME_absolute_get_duration (
keys[i].start_time.abs_time),
>,
keys[i].validity_duration))
{
/* key worked too later */
GNUNET_break (0);
return 5;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Received valid R for key %s\n",
GNUNET_h2s (&keys[i].h_cs.hash));
TALER_planchet_setup_coin_priv (&ps,
&alg_values,
&coin_priv);
TALER_planchet_blinding_secret_create (&ps,
&alg_values,
&bks);
GNUNET_assert (GNUNET_OK ==
TALER_planchet_prepare (&keys[i].denom_pub,
&alg_values,
&bks,
&coin_priv,
NULL, /* no age commitment */
&c_hash,
&pd));
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Successfully prepared planchet");
success = true;
break;
case TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY:
/* This 'failure' is expected, we're testing also for the
error handling! */
if ( (GNUNET_TIME_relative_is_zero (
GNUNET_TIME_absolute_get_remaining (
keys[i].start_time.abs_time))) &&
(GNUNET_TIME_relative_cmp (
GNUNET_TIME_absolute_get_duration (
keys[i].start_time.abs_time),
<,
keys[i].validity_duration)) )
{
/* key should have worked! */
GNUNET_break (0);
return 6;
}
break;
default:
/* unexpected error */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected error %d\n",
ec);
return 7;
}
}
if (! success)
{
/* no valid key for signing found, also bad */
GNUNET_break (0);
return 16;
}
/* check R derivation does not work if the key is unknown */
{
struct TALER_CsPubHashP rnd;
struct TALER_CsNonce nonce;
struct TALER_DenominationCSPublicRPairP crp;
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
&rnd,
sizeof (rnd));
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
&nonce,
sizeof (nonce));
ec = TALER_CRYPTO_helper_cs_r_derive_withdraw (dh,
&rnd,
&nonce,
&crp);
if (TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN != ec)
{
GNUNET_break (0);
return 17;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"R derivation with invalid key %s failed as desired\n",
GNUNET_h2s (&rnd.hash));
}
return 0;
}
/**
* Test signing logic.
*
* @param dh handle to the helper
* @return 0 on success
*/
static int
test_signing (struct TALER_CRYPTO_CsDenominationHelper *dh)
{
struct TALER_BlindedDenominationSignature ds;
enum TALER_ErrorCode ec;
bool success = false;
struct TALER_PlanchetMasterSecretP ps;
struct TALER_CoinSpendPrivateKeyP coin_priv;
union TALER_DenominationBlindingKeyP bks;
struct TALER_CoinPubHashP c_hash;
struct TALER_ExchangeWithdrawValues alg_values;
TALER_planchet_master_setup_random (&ps);
for (unsigned int i = 0; i,
GNUNET_TIME_UNIT_SECONDS))
{
/* key worked too early */
GNUNET_break (0);
return 4;
}
if (GNUNET_TIME_relative_cmp (GNUNET_TIME_absolute_get_duration (
keys[i].start_time.abs_time),
>,
keys[i].validity_duration))
{
/* key worked too later */
GNUNET_break (0);
return 5;
}
{
struct TALER_FreshCoin coin;
if (GNUNET_OK !=
TALER_planchet_to_coin (&keys[i].denom_pub,
&ds,
&bks,
&coin_priv,
NULL, /* no age commitment */
&c_hash,
&alg_values,
&coin))
{
GNUNET_break (0);
return 6;
}
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Received valid signature for key %s\n",
GNUNET_h2s (&keys[i].h_cs.hash));
success = true;
break;
case TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY:
/* This 'failure' is expected, we're testing also for the
error handling! */
if ( (GNUNET_TIME_relative_is_zero (
GNUNET_TIME_absolute_get_remaining (
keys[i].start_time.abs_time))) &&
(GNUNET_TIME_relative_cmp (
GNUNET_TIME_absolute_get_duration (
keys[i].start_time.abs_time),
<,
keys[i].validity_duration)) )
{
/* key should have worked! */
GNUNET_break (0);
return 6;
}
break;
default:
/* unexpected error */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected error %d\n",
ec);
return 7;
}
}
if (! success)
{
/* no valid key for signing found, also bad */
GNUNET_break (0);
return 16;
}
/* check signing does not work if the key is unknown */
{
struct TALER_PlanchetDetail pd;
struct TALER_CsPubHashP rnd;
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
&rnd,
sizeof (rnd));
pd.blinded_planchet.cipher = TALER_DENOMINATION_CS;
GNUNET_assert (GNUNET_YES ==
TALER_planchet_prepare (&keys[0].denom_pub,
&alg_values,
&bks,
&coin_priv,
NULL, /* no age commitment */
&c_hash,
&pd));
ec = TALER_CRYPTO_helper_cs_sign_withdraw (
dh,
&rnd,
&pd.blinded_planchet.details.cs_blinded_planchet,
&ds);
if (TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN != ec)
{
if (TALER_EC_NONE == ec)
TALER_blinded_denom_sig_free (&ds);
GNUNET_break (0);
return 17;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Signing with invalid key %s failed as desired\n",
GNUNET_h2s (&rnd.hash));
}
return 0;
}
/**
* Benchmark signing logic.
*
* @param dh handle to the helper
* @return 0 on success
*/
static int
perf_signing (struct TALER_CRYPTO_CsDenominationHelper *dh,
const char *type)
{
struct TALER_BlindedDenominationSignature ds;
enum TALER_ErrorCode ec;
struct GNUNET_TIME_Relative duration;
struct TALER_PlanchetMasterSecretP ps;
struct TALER_CoinSpendPrivateKeyP coin_priv;
union TALER_DenominationBlindingKeyP bks;
struct TALER_ExchangeWithdrawValues alg_values;
TALER_planchet_master_setup_random (&ps);
duration = GNUNET_TIME_UNIT_ZERO;
TALER_CRYPTO_helper_cs_poll (dh);
for (unsigned int j = 0; j,
GNUNET_TIME_UNIT_SECONDS))
continue;
if (GNUNET_TIME_relative_cmp (GNUNET_TIME_absolute_get_duration (
keys[i].start_time.abs_time),
>,
keys[i].validity_duration))
continue;
{
struct TALER_CoinPubHashP c_hash;
struct TALER_PlanchetDetail pd;
pd.blinded_planchet.cipher = TALER_DENOMINATION_CS;
TALER_cs_withdraw_nonce_derive (&ps,
&pd.blinded_planchet.details.
cs_blinded_planchet.nonce);
alg_values.cipher = TALER_DENOMINATION_CS;
ec = TALER_CRYPTO_helper_cs_r_derive_melt (
dh,
&keys[i].h_cs,
&pd.blinded_planchet.
details.
cs_blinded_planchet.nonce,
&alg_values.details.cs_values);
if (TALER_EC_NONE != ec)
continue;
TALER_planchet_setup_coin_priv (&ps,
&alg_values,
&coin_priv);
TALER_planchet_blinding_secret_create (&ps,
&alg_values,
&bks);
GNUNET_assert (GNUNET_YES ==
TALER_planchet_prepare (&keys[i].denom_pub,
&alg_values,
&bks,
&coin_priv,
NULL, /* no age commitment */
&c_hash,
&pd));
/* use this key as long as it works */
while (1)
{
struct GNUNET_TIME_Absolute start = GNUNET_TIME_absolute_get ();
struct GNUNET_TIME_Relative delay;
ec = TALER_CRYPTO_helper_cs_sign_melt (
dh,
&keys[i].h_cs,
&pd.blinded_planchet.details.
cs_blinded_planchet,
&ds);
if (TALER_EC_NONE != ec)
break;
delay = GNUNET_TIME_absolute_get_duration (start);
duration = GNUNET_TIME_relative_add (duration,
delay);
TALER_blinded_denom_sig_free (&ds);
j++;
if (NUM_SIGN_PERFS <= j)
break;
}
}
} /* for i */
} /* for j */
fprintf (stderr,
"%u (%s) signature operations took %s\n",
(unsigned int) NUM_SIGN_PERFS,
type,
GNUNET_STRINGS_relative_time_to_string (duration,
GNUNET_YES));
return 0;
}
/**
* Parallel signing logic.
*
* @param esh handle to the helper
* @return 0 on success
*/
static int
par_signing (struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_TIME_Absolute start;
struct GNUNET_TIME_Relative duration;
pid_t pids[NUM_CORES];
struct TALER_CRYPTO_CsDenominationHelper *dh;
start = GNUNET_TIME_absolute_get ();
for (unsigned int i = 0; i