path: root/tests/test-ecdsa.c

/*
 * test-ecdsa.c
 * ------------
 * Test harness for Cryptech ECDSA code.
 *
 * At the moment, the ECDSA code is a pure software implementation,
 * Verilog will be along eventually.
 *
 * Testing ECDSA is a bit tricky because ECDSA depends heavily on
 * using a new random secret for each signature.  So we can test some
 * things against the normal ECDSA implemenation, but some tests
 * require a side door replacement of the random number generator so
 * that we can use a known values from our test vector in place of the
 * random secret that would be used in real operation.  Test code for
 * the latter mode depends on the library having been compiled with
 * the testing hook enable, which it should not be for production use.
 *
 * Authors: Rob Austein
 * Copyright (c) 2015, SUNET
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>

#include <sys/time.h>

#include <hal.h>

#include "test-ecdsa.h"

/*
 * Supplied test vectors don't use ASN.1 encoding.  Don't want to
 * trust our own ASN.1 code for this (it's one of the things we're
 * testing) so use Python pyasn1 or ecdsa.der code to build what we
 * need and supply them as test vector data too.  This is probably
 * also the right way to test our encoding and decoding of private
 * keys too.
 */

#if HAL_ECDSA_DEBUG_ONLY_STATIC_TEST_VECTOR_RANDOM

/*
 * Code to let us replace ECDSA's random numbers with test data, if
 * the ECDSA library code has been compiled with support for this.
 */

typedef hal_error_t (*rng_override_test_function_t)(void *, const size_t);

extern rng_override_test_function_t hal_ecdsa_set_rng_override_test_function(rng_override_test_function_t new_func);

static const uint8_t               *next_random_value = NULL;
static size_t                       next_random_length = 0;

static hal_error_t next_random_handler(void *data, const size_t length)
{
  if (data == NULL)
    return HAL_ERROR_BAD_ARGUMENTS;

  if (next_random_value == NULL || length < next_random_length)
    return HAL_ERROR_IMPOSSIBLE;

  memset(data, 0, length);
  memcpy(data + length - next_random_length, next_random_value, next_random_length);

  next_random_value  = NULL;
  next_random_length = 0;

  (void) hal_ecdsa_set_rng_override_test_function(0);

  return HAL_OK;
}

static void set_next_random(const uint8_t * const data, const size_t length)
{
  (void) hal_ecdsa_set_rng_override_test_function(next_random_handler);
  next_random_value  = data;
  next_random_length = length;
}

/*
 * Run one keygen test from test vectors.
 */

static int test_against_static_vectors(const ecdsa_tc_t * const tc)

{
  hal_error_t err;

  printf("Starting static test vector tests for P-%d\n", tc->d_len * 8);

  set_next_random(tc->d, tc->d_len);

  uint8_t keybuf1[hal_ecdsa_key_t_size];
  hal_ecdsa_key_t *key1 = NULL;

  if ((err = hal_ecdsa_key_gen(&key1, keybuf1, sizeof(keybuf1), tc->curve)) != HAL_OK)
    return printf("hal_ecdsa_key_gen() failed: %s\n", hal_error_string(err)), 0;

  uint8_t Qx[tc->Qx_len], Qy[tc->Qy_len];
  size_t Qx_len, Qy_len;

  if ((err = hal_ecdsa_key_get_public(key1, Qx, &Qx_len, sizeof(Qx), Qy, &Qy_len, sizeof(Qy))) != HAL_OK)
    return printf("hal_ecdsa_key_get_public() failed: %s\n", hal_error_string(err)), 0;

  if (tc->Qx_len != Qx_len || memcmp(tc->Qx, Qx, Qx_len) != 0)
    return printf("Qx mismatch\n"), 0;

  if (tc->Qy_len != Qy_len || memcmp(tc->Qy, Qy, Qy_len) != 0)
    return printf("Qy mismatch\n"), 0;

  if (hal_ecdsa_key_to_der_len(key1) != tc->key_len)
    return printf("DER Key length mismatch\n"), 0;

  uint8_t keyder[tc->key_len];
  size_t keyder_len;

  if ((err = hal_ecdsa_key_to_der(key1, keyder, &keyder_len, sizeof(keyder))) != HAL_OK)
    return printf("hal_ecdsa_key_to_der() failed: %s\n", hal_error_string(err)), 0;

  uint8_t keybuf2[hal_ecdsa_key_t_size];
  hal_ecdsa_key_t *key2 = NULL;

  if ((err = hal_ecdsa_key_from_der(&key2, keybuf2, sizeof(keybuf2), keyder, keyder_len)) != HAL_OK)
    return printf("hal_ecdsa_key_from_der() failed: %s\n", hal_error_string(err)), 0;

  if (memcmp(key1, key2, hal_ecdsa_key_t_size) != 0)
    return printf("Key mismatch after read/write cycle\n"), 0;

  set_next_random(tc->k, tc->k_len);

  uint8_t sig[tc->sig_len];
  size_t  sig_len;

  if ((err = hal_ecdsa_sign(key1, tc->H, tc->H_len, sig, &sig_len, sizeof(sig))) != HAL_OK)
    return printf("hal_ecdsa_sign() failed: %s\n", hal_error_string(err)), 0;

  if (sig_len != tc->sig_len || memcmp(sig, tc->sig, tc->sig_len) != 0)
    return printf("Signature mismatch\n"), 0;

  if ((err = hal_ecdsa_verify(key2, tc->H, tc->H_len, sig, sig_len)) != HAL_OK)
    return printf("hal_ecdsa_verify(private) failed: %s\n", hal_error_string(err)), 0;

  hal_ecdsa_key_clear(key2);
  key2 = NULL;

  if ((err = hal_ecdsa_key_load_private(&key2, keybuf2, sizeof(keybuf2), tc->curve,
                                        tc->Qx, tc->Qx_len, tc->Qy, tc->Qy_len, tc->d, tc->d_len)) != HAL_OK)
    return printf("hal_ecdsa_load_private() failed: %s\n", hal_error_string(err)), 0;

  if (memcmp(key1, key2, hal_ecdsa_key_t_size) != 0)
    return printf("Key mismatch after hal_ecdsa_load_private_key()\n"), 0;

  hal_ecdsa_key_clear(key2);
  key2 = NULL;

  if ((err = hal_ecdsa_key_load_public(&key2, keybuf2, sizeof(keybuf2), tc->curve,
                                       tc->Qx, tc->Qx_len, tc->Qy, tc->Qy_len)) != HAL_OK)
    return printf("hal_ecdsa_load_public() failed: %s\n", hal_error_string(err)), 0;

  if ((err = hal_ecdsa_verify(key2, tc->H, tc->H_len, sig, sig_len)) != HAL_OK)
    return printf("hal_ecdsa_verify(public) failed: %s\n", hal_error_string(err)), 0;

  return 1;
}

#endif /* HAL_ECDSA_DEBUG_ONLY_STATIC_TEST_VECTOR_RANDOM */

/*
 * Run one keygen/sign/verify test with a newly generated key.
 */

static int test_keygen_sign_verify(const hal_ecdsa_curve_t curve)

{
  const hal_hash_descriptor_t *hash_descriptor = NULL;
  uint8_t keybuf[hal_ecdsa_key_t_size];
  hal_ecdsa_key_t *key = NULL;
  hal_error_t err;

  switch (curve) {

  case HAL_ECDSA_CURVE_P256:
    printf("ECDSA P-256 key generation / signature / verification test\n");
    hash_descriptor = hal_hash_sha256;
    break;

  case HAL_ECDSA_CURVE_P384:
    printf("ECDSA P-384 key generation / signature / verification test\n");
    hash_descriptor = hal_hash_sha384;
    break;

  case HAL_ECDSA_CURVE_P521:
    printf("ECDSA P-521 key generation / signature / verification test\n");
    hash_descriptor = hal_hash_sha512;
    break;

  default:
    printf("Unsupported ECDSA curve type\n");
    return 0;
  }

  if ((err =  hal_ecdsa_key_gen(&key, keybuf, sizeof(keybuf), curve)) != HAL_OK)
    return printf("hal_ecdsa_key_gen() failed: %s\n", hal_error_string(err)), 0;

  uint8_t hashbuf[hash_descriptor->digest_length];

  {
    const uint8_t plaintext[] = "So long, and thanks...";
    uint8_t statebuf[hash_descriptor->hash_state_length];
    hal_hash_state_t state = { NULL };

    if ((err = hal_hash_initialize(hash_descriptor, &state, statebuf, sizeof(statebuf))) != HAL_OK ||
        (err = hal_hash_update(state, plaintext, strlen((const char *) plaintext))) != HAL_OK ||
        (err = hal_hash_finalize(state, hashbuf, sizeof(hashbuf))) != HAL_OK)
      return printf("Couldn't hash plaintext: %s\n", hal_error_string(err)), 0;
  }

  /*
   * Lazy but probably-good-enough guess on signature size -- want
   * explicit number in ecdsa_curve_t?
   */
  uint8_t sigbuf[hash_descriptor->digest_length * 3];
  size_t  siglen;

  if ((err = hal_ecdsa_sign(key, hashbuf, sizeof(hashbuf), sigbuf, &siglen, sizeof(sigbuf))) != HAL_OK)
    return printf("hal_ecdsa_sign() failed: %s\n", hal_error_string(err)), 0;

  if ((err = hal_ecdsa_verify(key, hashbuf, sizeof(hashbuf), sigbuf, siglen)) != HAL_OK)
    return printf("hal_ecdsa_verify() failed: %s\n", hal_error_string(err)), 0;

  return 1;
}

/*
 * Time a test.
 */

static void _time_check(const struct timeval t0, const int ok)
{
  struct timeval t;
  gettimeofday(&t, NULL);
  t.tv_sec -= t0.tv_sec;
  t.tv_usec = t0.tv_usec;
  if (t.tv_usec < 0) {
    t.tv_usec += 1000000;
    t.tv_sec  -= 1;
  }
  printf("Elapsed time %lu.%06lu seconds, %s\n",
         (unsigned long) t.tv_sec,
         (unsigned long) t.tv_usec,
         ok ? "OK" : "FAILED");
}

#define time_check(_expr_)                      \
  do {                                          \
    struct timeval _t;                          \
    gettimeofday(&_t, NULL);                    \
    int _ok = (_expr_);                         \
    _time_check(_t, _ok);                       \
    ok &= _ok;                                  \
  } while (0)

/*
 * Run tests for one ECDSA curve.
 */

static int test_ecdsa(const ecdsa_tc_t * const tc)

{
  int ok = 1;
  time_check(test_against_static_vectors(tc));
  time_check(test_keygen_sign_verify(tc->curve));
  return ok;
}

int main(int argc, char *argv[])
{
  uint8_t name[8], version[4];
  hal_error_t err;

  /*
   * Initialize EIM and report what core we're running.
   */

  if ((err = hal_io_read(CSPRNG_ADDR_NAME0,   name,    sizeof(name)))    != HAL_OK ||
      (err = hal_io_read(CSPRNG_ADDR_VERSION, version, sizeof(version))) != HAL_OK) {
    printf("Initialization failed: %s\n", hal_error_string(err));
    return 1;
  }

  printf("\"%8.8s\"  \"%4.4s\"\n\n", name, version);

  for (int i = 0; i < sizeof(ecdsa_tc)/sizeof(*ecdsa_tc); i++)
    if (!test_ecdsa(&ecdsa_tc[i]))
      return 1;

  return 0;
}

/*
 * Local variables:
 * indent-tabs-mode: nil
 * End:
 */