[taler-exchange] 01/02: added benchmark tool for age restriction

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oec pushed a commit to branch master
in repository exchange.

commit adfb7ffd0ef23943f68ee46fd85ebd829c9f65a2
Author: Özgür Kesim <oec-taler@kesim.org>
AuthorDate: Thu Sep 29 11:59:42 2022 +0200

    added benchmark tool for age restriction
---
 src/util/bench_age_restriction.c  | 208 ++++++++++++++++++++++++++++++++++++++
 src/util/do_bench_age_restriction |   8 ++
 2 files changed, 216 insertions(+)

diff --git a/src/util/bench_age_restriction.c b/src/util/bench_age_restriction.c
new file mode 100644
index 00000000..abda9416
--- /dev/null
+++ b/src/util/bench_age_restriction.c
@@ -0,0 +1,208 @@
+/**
+ * @file util/bench_age_restriction.c
+ * @brief Measure Commit, Attest, Verify, Derive and Compare
+ * @author Özgür Kesim
+ *
+ * compile in exchange/src/util with
+ *
+ * gcc benc_age_restriction.c \
+ *    -lgnunetutil -lgnunetjson -lsodium -ljansson \
+ *    -L/usr/lib/x86_64-linux-gnu -lmicrohttpd -ltalerutil \
+ *    -I../include \
+ *    -o bench_age_restriction
+ *
+ */
+#include "platform.h"
+#include <math.h>
+#include <gnunet/gnunet_util_lib.h>
+#include <taler/taler_util.h>
+#include <taler/taler_crypto_lib.h>
+
+static struct TALER_AgeMask
+  age_mask = { .bits = 1
+                       | 1 << 8 | 1 << 10 | 1 << 12
+                       | 1 << 14 | 1 << 16 | 1 << 18 | 1 << 21 };
+
+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"
+ */
+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;
+}
+
+
+#define ITER 2000
+
+double
+average (long *times, size_t size)
+{
+  double mean = 0.0;
+  for (int i = 0; i < size; i++)
+  {
+    mean += times[i];
+  }
+  return mean / size;
+}
+
+
+double
+stdev (long *times, size_t size)
+{
+  double mean = average (times, size);
+  double V = 0.0;
+  for (int i = 0; i < size; i++)
+  {
+    double d = times[i] - mean;
+    d *= d;
+    V += d;
+  }
+  return sqrt (V / size);
+}
+
+
+#define pr(n,t, i) printf ("%10s (%dx):\t%.2f ± %.2fµs\n", (n), i, average ( \
+                             &t[0], ITER) / 1000, stdev (&t[0], ITER) / 1000); 
\
+  i = 0;
+
+#define starttime clock_gettime (CLOCK_MONOTONIC, &tstart)
+#define stoptime clock_gettime (CLOCK_MONOTONIC, &tend); \
+  times[i] = ((long) tend.tv_sec * 1000 * 1000 * 1000 + tend.tv_nsec) \
+             - ((long) tstart.tv_sec * 1000 * 1000 * 1000 + tstart.tv_nsec);
+
+
+int
+main (int argc,
+      const char *const argv[])
+{
+  struct timespec tstart = {0,0}, tend = {0,0};
+  enum GNUNET_GenericReturnValue ret;
+  struct TALER_AgeCommitmentProof acp = {0};
+  uint8_t age = 21;
+  uint8_t age_group = get_age_group (&age_mask, age);
+  struct GNUNET_HashCode seed;
+  long times[ITER] = {0};
+  int i = 0;
+
+  //  commit
+  for (; i < ITER; i++)
+  {
+    starttime;
+    GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
+                                &seed,
+                                sizeof(seed));
+
+    ret = TALER_age_restriction_commit (&age_mask,
+                                        age,
+                                        &seed,
+                                        &acp);
+    stoptime;
+
+  }
+  pr ("commit", times, i);
+
+  // attest
+  for (; i < ITER; i++)
+  {
+    GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
+                                &seed,
+                                sizeof(seed));
+
+    ret = TALER_age_restriction_commit (&age_mask,
+                                        age,
+                                        &seed,
+                                        &acp);
+
+    starttime;
+    uint8_t min_group = get_age_group (&age_mask, 13);
+    struct TALER_AgeAttestation at = {0};
+    ret = TALER_age_commitment_attest (&acp,
+                                       13,
+                                       &at);
+    stoptime;
+  }
+  pr ("attest", times, i);
+
+  // verify
+  for (; i < ITER; i++)
+  {
+    GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
+                                &seed,
+                                sizeof(seed));
+
+    ret = TALER_age_restriction_commit (&age_mask,
+                                        age,
+                                        &seed,
+                                        &acp);
+
+    uint8_t min_group = get_age_group (&age_mask, 13);
+    struct TALER_AgeAttestation at = {0};
+
+    ret = TALER_age_commitment_attest (&acp,
+                                       13,
+                                       &at);
+    starttime;
+    ret = TALER_age_commitment_verify (&acp.commitment,
+                                       13,
+                                       &at);
+    stoptime;
+  }
+  pr ("verify", times, i);
+
+  // derive
+  for (; i < ITER; i++)
+  {
+    struct TALER_AgeCommitmentProof acp2 = {0};
+    GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
+                                &seed,
+                                sizeof(seed));
+    starttime;
+    TALER_age_commitment_derive (&acp,
+                                 &seed,
+                                 &acp2);
+    stoptime;
+  }
+  pr ("derive", times, i);
+
+  return 0;
+}
+
+
+/* end of tv_age_restriction.c */
diff --git a/src/util/do_bench_age_restriction 
b/src/util/do_bench_age_restriction
new file mode 100755
index 00000000..a6571343
--- /dev/null
+++ b/src/util/do_bench_age_restriction
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+gcc bench_age_restriction.c \
+   -lgnunetutil -lgnunetjson -lsodium -ljansson \
+   -L/usr/lib/x86_64-linux-gnu -lmicrohttpd -ltalerutil -lm \
+   -I../include \
+   -o bench_age_restriction && ./bench_age_restriction
+

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