2 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* ====================================================================
11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
13 * Portions of the attached software ("Contribution") are developed by
14 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
16 * The Contribution is licensed pursuant to the OpenSSL open source
17 * license provided above.
19 * The elliptic curve binary polynomial software is originally written by
20 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
28 #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_EC is defined */
31 int main(int argc, char *argv[])
33 puts("Elliptic curves are disabled.");
38 # include <openssl/crypto.h>
39 # include <openssl/bio.h>
40 # include <openssl/evp.h>
41 # include <openssl/bn.h>
42 # include <openssl/ec.h>
43 # ifndef OPENSSL_NO_ENGINE
44 # include <openssl/engine.h>
46 # include <openssl/err.h>
47 # include <openssl/rand.h>
48 # include "testutil.h"
49 # include "test_main.h"
51 static const char rnd_seed[] = "string to make the random number generator "
52 "think it has entropy";
55 /* functions to change the RAND_METHOD */
56 static int fbytes(unsigned char *buf, int num);
58 static RAND_METHOD fake_rand;
59 static const RAND_METHOD *old_rand;
61 static int change_rand(void)
63 /* save old rand method */
64 if (!TEST_ptr(old_rand = RAND_get_rand_method()))
67 fake_rand = *old_rand;
68 /* use own random function */
69 fake_rand.bytes = fbytes;
70 /* set new RAND_METHOD */
71 if (!TEST_true(RAND_set_rand_method(&fake_rand)))
76 static int restore_rand(void)
78 if (!TEST_true(RAND_set_rand_method(old_rand)))
83 static int fbytes_counter = 0, use_fake = 0;
84 static const char *numbers[8] = {
85 "651056770906015076056810763456358567190100156695615665659",
86 "6140507067065001063065065565667405560006161556565665656654",
87 "8763001015071075675010661307616710783570106710677817767166"
89 "7000000175690566466555057817571571075705015757757057795755"
91 "1275552191113212300012030439187146164646146646466749494799",
92 "1542725565216523985789236956265265265235675811949404040041",
93 "1456427555219115346513212300075341203043918714616464614664"
95 "1712787255652165239672857892369562652652652356758119494040"
99 static int fbytes(unsigned char *buf, int num)
105 return old_rand->bytes(buf, num);
109 if (fbytes_counter >= 8)
111 if (!TEST_ptr(tmp = BN_new()))
113 if (!TEST_true(BN_dec2bn(&tmp, numbers[fbytes_counter]))) {
118 if (TEST_int_eq(BN_num_bytes(tmp), num)
119 && TEST_true(BN_bn2bin(tmp, buf)))
125 /* some tests from the X9.62 draft */
126 static int x9_62_test_internal(int nid, const char *r_in, const char *s_in)
129 const char message[] = "abc";
130 unsigned char digest[20];
131 unsigned int dgst_len = 0;
134 ECDSA_SIG *signature = NULL;
135 BIGNUM *r = NULL, *s = NULL;
136 BIGNUM *kinv = NULL, *rp = NULL;
137 const BIGNUM *sig_r, *sig_s;
139 if (!TEST_ptr(md_ctx = EVP_MD_CTX_new()))
142 /* get the message digest */
143 if (!TEST_true(EVP_DigestInit(md_ctx, EVP_sha1()))
144 || !TEST_true(EVP_DigestUpdate(md_ctx, (const void *)message, 3))
145 || !TEST_true(EVP_DigestFinal(md_ctx, digest, &dgst_len)))
148 TEST_info("testing %s", OBJ_nid2sn(nid));
151 if (!TEST_ptr(key = EC_KEY_new_by_curve_name(nid)))
154 if (!TEST_true(EC_KEY_generate_key(key)))
157 /* create the signature */
159 /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
160 if (!TEST_true(ECDSA_sign_setup(key, NULL, &kinv, &rp)))
162 if (!TEST_ptr(signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key)))
165 /* compare the created signature with the expected signature */
166 if (!TEST_ptr(r = BN_new()) || !TEST_ptr(s = BN_new()))
168 if (!TEST_true(BN_dec2bn(&r, r_in)) || !TEST_true(BN_dec2bn(&s, s_in)))
170 ECDSA_SIG_get0(signature, &sig_r, &sig_s);
171 if (!TEST_int_eq(BN_cmp(sig_r, r), 0)
172 || !TEST_int_eq(BN_cmp(sig_s, s), 0))
175 /* verify the signature */
176 if (!TEST_int_eq(ECDSA_do_verify(digest, 20, signature, key), 1))
183 ECDSA_SIG_free(signature);
186 EVP_MD_CTX_free(md_ctx);
192 static int x9_62_tests()
196 /* set own rand method */
200 if (!TEST_true(x9_62_test_internal(NID_X9_62_prime192v1,
201 "3342403536405981729393488334694600415596881826869351677613",
202 "5735822328888155254683894997897571951568553642892029982342")))
204 if (!TEST_true(x9_62_test_internal(NID_X9_62_prime239v1,
205 "3086361431751678114926225473006680188549593787585317781474"
207 "3238135532097973577080787768312505059318910517550078427819"
211 # ifndef OPENSSL_NO_EC2M
212 if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb191v1,
213 "87194383164871543355722284926904419997237591535066528048",
214 "308992691965804947361541664549085895292153777025772063598")))
216 if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb239v1,
217 "2159633321041961198501834003903461262881815148684178964245"
219 "1970303740007316867383349976549972270528498040721988191026"
226 if (!TEST_true(restore_rand()))
231 static int test_builtin(void)
233 EC_builtin_curve *curves = NULL;
234 size_t crv_len = 0, n = 0;
235 EC_KEY *eckey = NULL, *wrong_eckey = NULL;
237 ECDSA_SIG *ecdsa_sig = NULL, *modified_sig = NULL;
238 unsigned char digest[20], wrong_digest[20];
239 unsigned char *signature = NULL;
240 const unsigned char *sig_ptr;
241 unsigned char *sig_ptr2;
242 unsigned char *raw_buf = NULL;
243 const BIGNUM *sig_r, *sig_s;
244 BIGNUM *modified_r = NULL, *modified_s = NULL;
245 BIGNUM *unmodified_r = NULL, *unmodified_s = NULL;
246 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
249 /* fill digest values with some random data */
250 if (!TEST_true(RAND_bytes(digest, 20))
251 || !TEST_true(RAND_bytes(wrong_digest, 20)))
254 /* create and verify a ecdsa signature with every available curve */
255 /* get a list of all internal curves */
256 crv_len = EC_get_builtin_curves(NULL, 0);
257 if (!TEST_ptr(curves = OPENSSL_malloc(sizeof(*curves) * crv_len))
258 || !TEST_true(EC_get_builtin_curves(curves, crv_len)))
261 /* now create and verify a signature for every curve */
262 for (n = 0; n < crv_len; n++) {
263 unsigned char dirt, offset;
266 if (nid == NID_ipsec4 || nid == NID_X25519)
268 /* create new ecdsa key (== EC_KEY) */
269 if (!TEST_ptr(eckey = EC_KEY_new())
270 || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
271 || !TEST_true(EC_KEY_set_group(eckey, group)))
273 EC_GROUP_free(group);
274 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
281 TEST_info("testing %s", OBJ_nid2sn(nid));
284 if (!TEST_true(EC_KEY_generate_key(eckey)))
286 /* create second key */
287 if (!TEST_ptr(wrong_eckey = EC_KEY_new())
288 || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
289 || !TEST_true(EC_KEY_set_group(wrong_eckey, group)))
291 EC_GROUP_free(group);
292 if (!TEST_true(EC_KEY_generate_key(wrong_eckey)))
296 if (!TEST_true(EC_KEY_check_key(eckey)))
299 /* create signature */
300 sig_len = ECDSA_size(eckey);
301 if (!TEST_ptr(signature = OPENSSL_malloc(sig_len))
302 || !TEST_true(ECDSA_sign(0, digest, 20, signature, &sig_len,
306 /* verify signature */
307 if (!TEST_int_eq(ECDSA_verify(0, digest, 20, signature, sig_len,
311 /* verify signature with the wrong key */
312 if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature, sig_len,
317 if (!TEST_int_ne(ECDSA_verify(0, wrong_digest, 20, signature,
322 if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature,
323 sig_len - 1, eckey), 1))
327 * Modify a single byte of the signature: to ensure we don't garble
328 * the ASN1 structure, we read the raw signature and modify a byte in
329 * one of the bignums directly.
332 if (!TEST_ptr(ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)))
335 ECDSA_SIG_get0(ecdsa_sig, &sig_r, &sig_s);
337 /* Store the two BIGNUMs in raw_buf. */
338 r_len = BN_num_bytes(sig_r);
339 s_len = BN_num_bytes(sig_s);
340 bn_len = (degree + 7) / 8;
341 if (!TEST_false(r_len > bn_len)
342 || !TEST_false(s_len > bn_len))
344 buf_len = 2 * bn_len;
345 if (!TEST_ptr(raw_buf = OPENSSL_zalloc(buf_len)))
347 BN_bn2bin(sig_r, raw_buf + bn_len - r_len);
348 BN_bn2bin(sig_s, raw_buf + buf_len - s_len);
350 /* Modify a single byte in the buffer. */
351 offset = raw_buf[10] % buf_len;
352 dirt = raw_buf[11] ? raw_buf[11] : 1;
353 raw_buf[offset] ^= dirt;
355 /* Now read the BIGNUMs back in from raw_buf. */
356 if (!TEST_ptr(modified_sig = ECDSA_SIG_new()))
358 if (!TEST_ptr(modified_r = BN_bin2bn(raw_buf, bn_len, NULL))
359 || !TEST_ptr(modified_s = BN_bin2bn(raw_buf + bn_len,
361 || !TEST_true(ECDSA_SIG_set0(modified_sig,
362 modified_r, modified_s))) {
367 sig_ptr2 = signature;
368 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
369 if (!TEST_false(ECDSA_verify(0, digest, 20, signature, sig_len, eckey)))
372 /* Sanity check: undo the modification and verify signature. */
373 raw_buf[offset] ^= dirt;
374 if (!TEST_ptr(unmodified_r = BN_bin2bn(raw_buf, bn_len, NULL))
375 || !TEST_ptr(unmodified_s = BN_bin2bn(raw_buf + bn_len,
377 || !TEST_true(ECDSA_SIG_set0(modified_sig, unmodified_r,
379 BN_free(unmodified_r);
380 BN_free(unmodified_s);
384 sig_ptr2 = signature;
385 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
386 if (!TEST_true(ECDSA_verify(0, digest, 20, signature, sig_len, eckey)))
391 OPENSSL_free(signature);
395 EC_KEY_free(wrong_eckey);
397 ECDSA_SIG_free(ecdsa_sig);
399 ECDSA_SIG_free(modified_sig);
401 OPENSSL_free(raw_buf);
408 EC_KEY_free(wrong_eckey);
409 ECDSA_SIG_free(ecdsa_sig);
410 ECDSA_SIG_free(modified_sig);
411 OPENSSL_free(signature);
412 OPENSSL_free(raw_buf);
413 OPENSSL_free(curves);
418 void register_tests(void)
420 /* initialize the prng */
421 RAND_seed(rnd_seed, sizeof(rnd_seed));
422 ADD_TEST(x9_62_tests);
423 ADD_TEST(test_builtin);