2 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
5 * Licensed under the OpenSSL license (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
15 #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_EC is defined */
18 int main(int argc, char *argv[])
20 puts("Elliptic curves are disabled.");
25 # include <openssl/crypto.h>
26 # include <openssl/bio.h>
27 # include <openssl/evp.h>
28 # include <openssl/bn.h>
29 # include <openssl/ec.h>
30 # ifndef OPENSSL_NO_ENGINE
31 # include <openssl/engine.h>
33 # include <openssl/err.h>
34 # include <openssl/rand.h>
35 # include "testutil.h"
37 static const char rnd_seed[] = "string to make the random number generator "
38 "think it has entropy";
41 /* functions to change the RAND_METHOD */
42 static int fbytes(unsigned char *buf, int num);
44 static RAND_METHOD fake_rand;
45 static const RAND_METHOD *old_rand;
47 static int change_rand(void)
49 /* save old rand method */
50 if (!TEST_ptr(old_rand = RAND_get_rand_method()))
53 fake_rand = *old_rand;
54 /* use own random function */
55 fake_rand.bytes = fbytes;
56 /* set new RAND_METHOD */
57 if (!TEST_true(RAND_set_rand_method(&fake_rand)))
62 static int restore_rand(void)
64 if (!TEST_true(RAND_set_rand_method(old_rand)))
69 static int fbytes_counter = 0, use_fake = 0;
70 static const char *numbers[8] = {
71 "651056770906015076056810763456358567190100156695615665659",
72 "6140507067065001063065065565667405560006161556565665656654",
73 "8763001015071075675010661307616710783570106710677817767166"
75 "7000000175690566466555057817571571075705015757757057795755"
77 "1275552191113212300012030439187146164646146646466749494799",
78 "1542725565216523985789236956265265265235675811949404040041",
79 "1456427555219115346513212300075341203043918714616464614664"
81 "1712787255652165239672857892369562652652652356758119494040"
85 static int fbytes(unsigned char *buf, int num)
91 return old_rand->bytes(buf, num);
95 if (fbytes_counter >= 8)
97 if (!TEST_ptr(tmp = BN_new()))
99 if (!TEST_true(BN_dec2bn(&tmp, numbers[fbytes_counter]))) {
104 if (TEST_int_eq(BN_num_bytes(tmp), num)
105 && TEST_true(BN_bn2bin(tmp, buf)))
111 /* some tests from the X9.62 draft */
112 static int x9_62_test_internal(int nid, const char *r_in, const char *s_in)
115 const char message[] = "abc";
116 unsigned char digest[20];
117 unsigned int dgst_len = 0;
120 ECDSA_SIG *signature = NULL;
121 BIGNUM *r = NULL, *s = NULL;
122 BIGNUM *kinv = NULL, *rp = NULL;
123 const BIGNUM *sig_r, *sig_s;
125 if (!TEST_ptr(md_ctx = EVP_MD_CTX_new()))
128 /* get the message digest */
129 if (!TEST_true(EVP_DigestInit(md_ctx, EVP_sha1()))
130 || !TEST_true(EVP_DigestUpdate(md_ctx, (const void *)message, 3))
131 || !TEST_true(EVP_DigestFinal(md_ctx, digest, &dgst_len)))
134 TEST_info("testing %s", OBJ_nid2sn(nid));
137 if (!TEST_ptr(key = EC_KEY_new_by_curve_name(nid)))
140 if (!TEST_true(EC_KEY_generate_key(key)))
143 /* create the signature */
145 /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
146 if (!TEST_true(ECDSA_sign_setup(key, NULL, &kinv, &rp)))
148 if (!TEST_ptr(signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key)))
151 /* compare the created signature with the expected signature */
152 if (!TEST_ptr(r = BN_new()) || !TEST_ptr(s = BN_new()))
154 if (!TEST_true(BN_dec2bn(&r, r_in)) || !TEST_true(BN_dec2bn(&s, s_in)))
156 ECDSA_SIG_get0(signature, &sig_r, &sig_s);
157 if (!TEST_BN_eq(sig_r, r)
158 || !TEST_BN_eq(sig_s, s))
161 /* verify the signature */
162 if (!TEST_int_eq(ECDSA_do_verify(digest, 20, signature, key), 1))
169 ECDSA_SIG_free(signature);
172 EVP_MD_CTX_free(md_ctx);
178 static int x9_62_tests()
182 /* set own rand method */
186 if (!TEST_true(x9_62_test_internal(NID_X9_62_prime192v1,
187 "3342403536405981729393488334694600415596881826869351677613",
188 "5735822328888155254683894997897571951568553642892029982342")))
190 if (!TEST_true(x9_62_test_internal(NID_X9_62_prime239v1,
191 "3086361431751678114926225473006680188549593787585317781474"
193 "3238135532097973577080787768312505059318910517550078427819"
197 # ifndef OPENSSL_NO_EC2M
198 if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb191v1,
199 "87194383164871543355722284926904419997237591535066528048",
200 "308992691965804947361541664549085895292153777025772063598")))
202 if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb239v1,
203 "2159633321041961198501834003903461262881815148684178964245"
205 "1970303740007316867383349976549972270528498040721988191026"
212 if (!TEST_true(restore_rand()))
217 static int test_builtin(void)
219 EC_builtin_curve *curves = NULL;
220 size_t crv_len = 0, n = 0;
221 EC_KEY *eckey = NULL, *wrong_eckey = NULL;
223 ECDSA_SIG *ecdsa_sig = NULL, *modified_sig = NULL;
224 unsigned char digest[20], wrong_digest[20];
225 unsigned char *signature = NULL;
226 const unsigned char *sig_ptr;
227 unsigned char *sig_ptr2;
228 unsigned char *raw_buf = NULL;
229 const BIGNUM *sig_r, *sig_s;
230 BIGNUM *modified_r = NULL, *modified_s = NULL;
231 BIGNUM *unmodified_r = NULL, *unmodified_s = NULL;
232 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
235 /* fill digest values with some random data */
236 if (!TEST_true(RAND_bytes(digest, 20))
237 || !TEST_true(RAND_bytes(wrong_digest, 20)))
240 /* create and verify a ecdsa signature with every available curve */
241 /* get a list of all internal curves */
242 crv_len = EC_get_builtin_curves(NULL, 0);
243 if (!TEST_ptr(curves = OPENSSL_malloc(sizeof(*curves) * crv_len))
244 || !TEST_true(EC_get_builtin_curves(curves, crv_len)))
247 /* now create and verify a signature for every curve */
248 for (n = 0; n < crv_len; n++) {
249 unsigned char dirt, offset;
252 if (nid == NID_ipsec4 || nid == NID_X25519)
254 /* create new ecdsa key (== EC_KEY) */
255 if (!TEST_ptr(eckey = EC_KEY_new())
256 || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
257 || !TEST_true(EC_KEY_set_group(eckey, group)))
259 EC_GROUP_free(group);
260 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
267 TEST_info("testing %s", OBJ_nid2sn(nid));
270 if (!TEST_true(EC_KEY_generate_key(eckey)))
272 /* create second key */
273 if (!TEST_ptr(wrong_eckey = EC_KEY_new())
274 || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
275 || !TEST_true(EC_KEY_set_group(wrong_eckey, group)))
277 EC_GROUP_free(group);
278 if (!TEST_true(EC_KEY_generate_key(wrong_eckey)))
282 if (!TEST_true(EC_KEY_check_key(eckey)))
285 /* create signature */
286 sig_len = ECDSA_size(eckey);
287 if (!TEST_ptr(signature = OPENSSL_malloc(sig_len))
288 || !TEST_true(ECDSA_sign(0, digest, 20, signature, &sig_len,
292 /* verify signature */
293 if (!TEST_int_eq(ECDSA_verify(0, digest, 20, signature, sig_len,
297 /* verify signature with the wrong key */
298 if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature, sig_len,
303 if (!TEST_int_ne(ECDSA_verify(0, wrong_digest, 20, signature,
308 if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature,
309 sig_len - 1, eckey), 1))
313 * Modify a single byte of the signature: to ensure we don't garble
314 * the ASN1 structure, we read the raw signature and modify a byte in
315 * one of the bignums directly.
318 if (!TEST_ptr(ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)))
321 ECDSA_SIG_get0(ecdsa_sig, &sig_r, &sig_s);
323 /* Store the two BIGNUMs in raw_buf. */
324 r_len = BN_num_bytes(sig_r);
325 s_len = BN_num_bytes(sig_s);
326 bn_len = (degree + 7) / 8;
327 if (!TEST_false(r_len > bn_len)
328 || !TEST_false(s_len > bn_len))
330 buf_len = 2 * bn_len;
331 if (!TEST_ptr(raw_buf = OPENSSL_zalloc(buf_len)))
333 BN_bn2bin(sig_r, raw_buf + bn_len - r_len);
334 BN_bn2bin(sig_s, raw_buf + buf_len - s_len);
336 /* Modify a single byte in the buffer. */
337 offset = raw_buf[10] % buf_len;
338 dirt = raw_buf[11] ? raw_buf[11] : 1;
339 raw_buf[offset] ^= dirt;
341 /* Now read the BIGNUMs back in from raw_buf. */
342 if (!TEST_ptr(modified_sig = ECDSA_SIG_new()))
344 if (!TEST_ptr(modified_r = BN_bin2bn(raw_buf, bn_len, NULL))
345 || !TEST_ptr(modified_s = BN_bin2bn(raw_buf + bn_len,
347 || !TEST_true(ECDSA_SIG_set0(modified_sig,
348 modified_r, modified_s))) {
353 sig_ptr2 = signature;
354 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
355 if (!TEST_false(ECDSA_verify(0, digest, 20, signature, sig_len, eckey)))
358 /* Sanity check: undo the modification and verify signature. */
359 raw_buf[offset] ^= dirt;
360 if (!TEST_ptr(unmodified_r = BN_bin2bn(raw_buf, bn_len, NULL))
361 || !TEST_ptr(unmodified_s = BN_bin2bn(raw_buf + bn_len,
363 || !TEST_true(ECDSA_SIG_set0(modified_sig, unmodified_r,
365 BN_free(unmodified_r);
366 BN_free(unmodified_s);
370 sig_ptr2 = signature;
371 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
372 if (!TEST_true(ECDSA_verify(0, digest, 20, signature, sig_len, eckey)))
377 OPENSSL_free(signature);
381 EC_KEY_free(wrong_eckey);
383 ECDSA_SIG_free(ecdsa_sig);
385 ECDSA_SIG_free(modified_sig);
387 OPENSSL_free(raw_buf);
394 EC_KEY_free(wrong_eckey);
395 ECDSA_SIG_free(ecdsa_sig);
396 ECDSA_SIG_free(modified_sig);
397 OPENSSL_free(signature);
398 OPENSSL_free(raw_buf);
399 OPENSSL_free(curves);
404 void register_tests(void)
406 /* initialize the prng */
407 RAND_seed(rnd_seed, sizeof(rnd_seed));
408 ADD_TEST(x9_62_tests);
409 ADD_TEST(test_builtin);