1/* Copyright (c) 2016, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15#include <stdio.h>
16
17#include <vector>
18
19#include <openssl/bn.h>
20#include <openssl/crypto.h>
21#include <openssl/ec.h>
22#include <openssl/ec_key.h>
23#include <openssl/ecdsa.h>
24#include <openssl/nid.h>
25
26#include "../test/file_test.h"
27
28
29static bssl::UniquePtr<EC_GROUP> GetCurve(FileTest *t, const char *key) {
30  std::string curve_name;
31  if (!t->GetAttribute(&curve_name, key)) {
32    return nullptr;
33  }
34
35  if (curve_name == "P-224") {
36    return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp224r1));
37  }
38  if (curve_name == "P-256") {
39    return bssl::UniquePtr<EC_GROUP>(
40        EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1));
41  }
42  if (curve_name == "P-384") {
43    return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp384r1));
44  }
45  if (curve_name == "P-521") {
46    return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp521r1));
47  }
48
49  t->PrintLine("Unknown curve '%s'", curve_name.c_str());
50  return nullptr;
51}
52
53static bssl::UniquePtr<BIGNUM> GetBIGNUM(FileTest *t, const char *key) {
54  std::vector<uint8_t> bytes;
55  if (!t->GetBytes(&bytes, key)) {
56    return nullptr;
57  }
58
59  return bssl::UniquePtr<BIGNUM>(BN_bin2bn(bytes.data(), bytes.size(), nullptr));
60}
61
62static bool TestECDSASign(FileTest *t, void *arg) {
63  bssl::UniquePtr<EC_GROUP> group = GetCurve(t, "Curve");
64  bssl::UniquePtr<BIGNUM> x = GetBIGNUM(t, "X");
65  bssl::UniquePtr<BIGNUM> y = GetBIGNUM(t, "Y");
66  bssl::UniquePtr<BIGNUM> r = GetBIGNUM(t, "R");
67  bssl::UniquePtr<BIGNUM> s = GetBIGNUM(t, "S");
68  std::vector<uint8_t> digest;
69  if (!group || !x || !y || !r || !s ||
70      !t->GetBytes(&digest, "Digest")) {
71    return false;
72  }
73
74  bssl::UniquePtr<EC_KEY> key(EC_KEY_new());
75  bssl::UniquePtr<EC_POINT> pub_key(EC_POINT_new(group.get()));
76  bssl::UniquePtr<ECDSA_SIG> sig(ECDSA_SIG_new());
77  if (!key || !pub_key || !sig ||
78      !EC_KEY_set_group(key.get(), group.get()) ||
79      !EC_POINT_set_affine_coordinates_GFp(group.get(), pub_key.get(), x.get(),
80                                           y.get(), nullptr) ||
81      !EC_KEY_set_public_key(key.get(), pub_key.get()) ||
82      !BN_copy(sig->r, r.get()) ||
83      !BN_copy(sig->s, s.get())) {
84    return false;
85  }
86
87  int ok = ECDSA_do_verify(digest.data(), digest.size(), sig.get(), key.get());
88  if (t->HasAttribute("Invalid")) {
89    if (ok) {
90      t->PrintLine("Signature was incorrectly accepted.");
91      return false;
92    }
93  } else if (!ok) {
94    t->PrintLine("Signature was incorrectly rejected.");
95    return false;
96  }
97
98  return true;
99}
100
101int main(int argc, char *argv[]) {
102  CRYPTO_library_init();
103
104  if (argc != 2) {
105    fprintf(stderr, "%s <test file.txt>\n", argv[0]);
106    return 1;
107  }
108
109  return FileTestMain(TestECDSASign, nullptr, argv[1]);
110}
111