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/*
This file is part of TALER
(C) 2022 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 <http://www.gnu.org/licenses/>
*/
/**
* @file util/test_age_restriction.c
* @brief Tests for age restriction specific logic
* @author Özgür Kesim
*/
#include "platform.h"
#include "taler_util.h"
#include "taler_crypto_lib.h"
extern uint8_t
get_age_group (
const struct TALER_AgeMask *mask,
uint8_t age);
/**
* Encodes the age mask into a string, like "8:10:12:14:16:18:21"
*
* @param mask Age mask
* @return String representation of the age mask, allocated by GNUNET_malloc.
* Can be used as value in the TALER config.
*/
char *
age_mask_to_string (
const struct TALER_AgeMask *m)
{
uint32_t bits = m->bits;
unsigned int n = 0;
char *buf = GNUNET_malloc (32 * 3); // max characters possible
char *pos = buf;
if (NULL == buf)
{
return buf;
}
while (bits != 0)
{
bits >>= 1;
n++;
if (0 == (bits & 1))
{
continue;
}
if (n > 9)
{
*(pos++) = '0' + n / 10;
}
*(pos++) = '0' + n % 10;
if (0 != (bits >> 1))
{
*(pos++) = ':';
}
}
return buf;
}
enum GNUNET_GenericReturnValue
test_groups (void)
{
struct
{
uint32_t bits;
uint8_t group[33];
} test[] = {
{
.bits =
1 | 1 << 5 | 1 << 13 | 1 << 23,
.group = { 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3 }
},
{
.bits =
1 | 1 << 8 | 1 << 10 | 1 << 12 | 1 << 14 | 1 << 16 | 1 << 18 | 1 << 21,
.group = { 0, 0, 0, 0, 0, 0, 0, 0,
1, 1,
2, 2,
3, 3,
4, 4,
5, 5,
6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7}
}
};
for (uint8_t t = 0; t < sizeof(test) / sizeof(test[0]); t++)
{
struct TALER_AgeMask mask = {.bits = test[t].bits};
for (uint8_t i = 0; i < 32; i++)
{
uint8_t r = get_age_group (&mask, i);
char *m = age_mask_to_string (&mask);
printf ("get_age_group(%s, %2d) = %d vs %d (exp)\n",
m,
i,
r,
test[t].group[i]);
if (test[t].group[i] != r)
return GNUNET_SYSERR;
GNUNET_free (m);
}
}
return GNUNET_OK;
}
static struct TALER_AgeMask age_mask = {
.bits = 1 | 1 << 8 | 1 << 10 | 1 << 12 | 1 << 14 | 1 << 16 | 1 << 18 | 1 << 21
};
enum GNUNET_GenericReturnValue
test_attestation (void)
{
uint8_t age;
for (age = 0; age < 33; age++)
{
enum GNUNET_GenericReturnValue ret;
struct TALER_AgeCommitmentProof acp[3] = {0};
struct TALER_AgeAttestation at = {0};
uint8_t age_group = get_age_group (&age_mask, age);
struct GNUNET_HashCode seed;
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
&seed,
sizeof(seed));
ret = TALER_age_restriction_commit (&age_mask,
age,
&seed,
&acp[0]);
printf (
"commit(age:%d) == %d; proof.num: %ld; age_group: %d\n",
age,
ret,
acp[0].proof.num,
age_group);
/* Also derive two more commitments right away */
for (uint8_t i = 0; i<2; i++)
{
struct GNUNET_HashCode salt;
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
&salt,
sizeof (salt));
GNUNET_assert (GNUNET_OK ==
TALER_age_commitment_derive (&acp[i],
&salt,
&acp[i + 1]));
}
for (uint8_t i = 0; i < 3; i++)
{
for (uint8_t min = 0; min < 22; min++)
{
uint8_t min_group = get_age_group (&age_mask, min);
ret = TALER_age_commitment_attest (&acp[i],
min,
&at);
printf (
"[%s]: attest(min:%d, age:%d) == %d; age_group: %d, min_group: %d\n",
i == 0 ? "commit" : "derive",
min,
age,
ret,
age_group,
min_group);
GNUNET_break (GNUNET_OK == ret);
if (min_group <= age_group &&
GNUNET_OK != ret)
{
GNUNET_break (0);
ret = GNUNET_SYSERR;
}
if (min_group > age_group &&
GNUNET_NO != ret)
{
GNUNET_break (0);
ret = GNUNET_SYSERR;
}
if (min_group > age_group)
continue;
ret = TALER_age_commitment_verify (&acp[i].commitment,
min,
&at);
printf (
"[%s]: verify(min:%d, age:%d) == %d; age_group:%d, min_group: %d\n",
i == 0 ? "commit" : "derive",
min,
age,
ret,
age_group,
min_group);
if (GNUNET_OK != ret)
{
GNUNET_break (0);
break;
}
}
TALER_age_commitment_proof_free (&acp[i]);
}
if (GNUNET_SYSERR == ret)
{
GNUNET_break (0);
return ret;
}
}
return GNUNET_OK;
}
int
main (int argc,
const char *const argv[])
{
(void) argc;
(void) argv;
GNUNET_log_setup ("test-age-restriction",
"INFO",
NULL);
if (GNUNET_OK != test_groups ())
return 1;
if (GNUNET_OK != test_attestation ())
{
GNUNET_break (0);
return 2;
}
return 0;
}
/* end of test_age_restriction.c */
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