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/ecdh.h>
24 #include <openssl/nid.h>
25
26 #include "../test/file_test.h"
27
28
GetCurve(FileTest * t,const char * key)29 static 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>(EC_GROUP_new_by_curve_name(
40 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
GetBIGNUM(FileTest * t,const char * key)53 static 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
TestECDH(FileTest * t,void * arg)62 static bool TestECDH(FileTest *t, void *arg) {
63 bssl::UniquePtr<EC_GROUP> group = GetCurve(t, "Curve");
64 bssl::UniquePtr<BIGNUM> priv_key = GetBIGNUM(t, "Private");
65 bssl::UniquePtr<BIGNUM> x = GetBIGNUM(t, "X");
66 bssl::UniquePtr<BIGNUM> y = GetBIGNUM(t, "Y");
67 bssl::UniquePtr<BIGNUM> peer_x = GetBIGNUM(t, "PeerX");
68 bssl::UniquePtr<BIGNUM> peer_y = GetBIGNUM(t, "PeerY");
69 std::vector<uint8_t> z;
70 if (!group || !priv_key || !x || !y || !peer_x || !peer_y ||
71 !t->GetBytes(&z, "Z")) {
72 return false;
73 }
74
75 bssl::UniquePtr<EC_KEY> key(EC_KEY_new());
76 bssl::UniquePtr<EC_POINT> pub_key(EC_POINT_new(group.get()));
77 bssl::UniquePtr<EC_POINT> peer_pub_key(EC_POINT_new(group.get()));
78 if (!key || !pub_key || !peer_pub_key ||
79 !EC_KEY_set_group(key.get(), group.get()) ||
80 !EC_KEY_set_private_key(key.get(), priv_key.get()) ||
81 !EC_POINT_set_affine_coordinates_GFp(group.get(), pub_key.get(), x.get(),
82 y.get(), nullptr) ||
83 !EC_POINT_set_affine_coordinates_GFp(group.get(), peer_pub_key.get(),
84 peer_x.get(), peer_y.get(),
85 nullptr) ||
86 !EC_KEY_set_public_key(key.get(), pub_key.get()) ||
87 !EC_KEY_check_key(key.get())) {
88 return false;
89 }
90
91 std::vector<uint8_t> actual_z;
92 // Make |actual_z| larger than expected to ensure |ECDH_compute_key| returns
93 // the right amount of data.
94 actual_z.resize(z.size() + 1);
95 int ret = ECDH_compute_key(actual_z.data(), actual_z.size(),
96 peer_pub_key.get(), key.get(), nullptr);
97 if (ret < 0 ||
98 !t->ExpectBytesEqual(z.data(), z.size(), actual_z.data(),
99 static_cast<size_t>(ret))) {
100 return false;
101 }
102
103 // Test |ECDH_compute_key| truncates.
104 actual_z.resize(z.size() - 1);
105 ret = ECDH_compute_key(actual_z.data(), actual_z.size(), peer_pub_key.get(),
106 key.get(), nullptr);
107 if (ret < 0 ||
108 !t->ExpectBytesEqual(z.data(), z.size() - 1, actual_z.data(),
109 static_cast<size_t>(ret))) {
110 return false;
111 }
112
113 return true;
114 }
115
main(int argc,char * argv[])116 int main(int argc, char *argv[]) {
117 CRYPTO_library_init();
118
119 if (argc != 2) {
120 fprintf(stderr, "%s <test file.txt>\n", argv[0]);
121 return 1;
122 }
123
124 return FileTestMain(TestECDH, nullptr, argv[1]);
125 }
126