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"
50 static const char rnd_seed[] = "string to make the random number generator "
51 "think it has entropy";
54 /* functions to change the RAND_METHOD */
55 static int fbytes(unsigned char *buf, int num);
57 static RAND_METHOD fake_rand;
58 static const RAND_METHOD *old_rand;
60 static int change_rand(void)
62 /* save old rand method */
63 if (!TEST_ptr(old_rand = RAND_get_rand_method()))
66 fake_rand = *old_rand;
67 /* use own random function */
68 fake_rand.bytes = fbytes;
69 /* set new RAND_METHOD */
70 if (!TEST_true(RAND_set_rand_method(&fake_rand)))
75 static int restore_rand(void)
77 if (!TEST_true(RAND_set_rand_method(old_rand)))
82 static int fbytes_counter = 0, use_fake = 0;
83 static const char *numbers[8] = {
84 "651056770906015076056810763456358567190100156695615665659",
85 "6140507067065001063065065565667405560006161556565665656654",
86 "8763001015071075675010661307616710783570106710677817767166"
88 "7000000175690566466555057817571571075705015757757057795755"
90 "1275552191113212300012030439187146164646146646466749494799",
91 "1542725565216523985789236956265265265235675811949404040041",
92 "1456427555219115346513212300075341203043918714616464614664"
94 "1712787255652165239672857892369562652652652356758119494040"
98 static int fbytes(unsigned char *buf, int num)
104 return old_rand->bytes(buf, num);
108 if (fbytes_counter >= 8)
110 if (!TEST_ptr(tmp = BN_new()))
112 if (!TEST_true(BN_dec2bn(&tmp, numbers[fbytes_counter]))) {
117 if (TEST_int_eq(BN_num_bytes(tmp), num)
118 && TEST_true(BN_bn2bin(tmp, buf)))
124 /* some tests from the X9.62 draft */
125 static int x9_62_test_internal(int nid, const char *r_in, const char *s_in)
128 const char message[] = "abc";
129 unsigned char digest[20];
130 unsigned int dgst_len = 0;
133 ECDSA_SIG *signature = NULL;
134 BIGNUM *r = NULL, *s = NULL;
135 BIGNUM *kinv = NULL, *rp = NULL;
136 const BIGNUM *sig_r, *sig_s;
138 if (!TEST_ptr(md_ctx = EVP_MD_CTX_new()))
141 /* get the message digest */
142 if (!TEST_true(EVP_DigestInit(md_ctx, EVP_sha1()))
143 || !TEST_true(EVP_DigestUpdate(md_ctx, (const void *)message, 3))
144 || !TEST_true(EVP_DigestFinal(md_ctx, digest, &dgst_len)))
147 TEST_info("testing %s", OBJ_nid2sn(nid));
150 if (!TEST_ptr(key = EC_KEY_new_by_curve_name(nid)))
153 if (!TEST_true(EC_KEY_generate_key(key)))
156 /* create the signature */
158 /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
159 if (!TEST_true(ECDSA_sign_setup(key, NULL, &kinv, &rp)))
161 if (!TEST_ptr(signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key)))
164 /* compare the created signature with the expected signature */
165 if (!TEST_ptr(r = BN_new()) || !TEST_ptr(s = BN_new()))
167 if (!TEST_true(BN_dec2bn(&r, r_in)) || !TEST_true(BN_dec2bn(&s, s_in)))
169 ECDSA_SIG_get0(signature, &sig_r, &sig_s);
170 if (!TEST_int_eq(BN_cmp(sig_r, r), 0)
171 || !TEST_int_eq(BN_cmp(sig_s, s), 0))
174 /* verify the signature */
175 if (!TEST_int_eq(ECDSA_do_verify(digest, 20, signature, key), 1))
182 ECDSA_SIG_free(signature);
185 EVP_MD_CTX_free(md_ctx);
191 static int x9_62_tests()
195 /* set own rand method */
199 if (!TEST_true(x9_62_test_internal(NID_X9_62_prime192v1,
200 "3342403536405981729393488334694600415596881826869351677613",
201 "5735822328888155254683894997897571951568553642892029982342")))
203 if (!TEST_true(x9_62_test_internal(NID_X9_62_prime239v1,
204 "3086361431751678114926225473006680188549593787585317781474"
206 "3238135532097973577080787768312505059318910517550078427819"
210 # ifndef OPENSSL_NO_EC2M
211 if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb191v1,
212 "87194383164871543355722284926904419997237591535066528048",
213 "308992691965804947361541664549085895292153777025772063598")))
215 if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb239v1,
216 "2159633321041961198501834003903461262881815148684178964245"
218 "1970303740007316867383349976549972270528498040721988191026"
225 if (!TEST_true(restore_rand()))
230 static int test_builtin(void)
232 EC_builtin_curve *curves = NULL;
233 size_t crv_len = 0, n = 0;
234 EC_KEY *eckey = NULL, *wrong_eckey = NULL;
236 ECDSA_SIG *ecdsa_sig = NULL, *modified_sig = NULL;
237 unsigned char digest[20], wrong_digest[20];
238 unsigned char *signature = NULL;
239 const unsigned char *sig_ptr;
240 unsigned char *sig_ptr2;
241 unsigned char *raw_buf = NULL;
242 const BIGNUM *sig_r, *sig_s;
243 BIGNUM *modified_r = NULL, *modified_s = NULL;
244 BIGNUM *unmodified_r = NULL, *unmodified_s = NULL;
245 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
248 /* fill digest values with some random data */
249 if (!TEST_true(RAND_bytes(digest, 20))
250 || !TEST_true(RAND_bytes(wrong_digest, 20)))
253 /* create and verify a ecdsa signature with every available curve */
254 /* get a list of all internal curves */
255 crv_len = EC_get_builtin_curves(NULL, 0);
256 if (!TEST_ptr(curves = OPENSSL_malloc(sizeof(*curves) * crv_len))
257 || !TEST_true(EC_get_builtin_curves(curves, crv_len)))
260 /* now create and verify a signature for every curve */
261 for (n = 0; n < crv_len; n++) {
262 unsigned char dirt, offset;
265 if (nid == NID_ipsec4 || nid == NID_X25519)
267 /* create new ecdsa key (== EC_KEY) */
268 if (!TEST_ptr(eckey = EC_KEY_new())
269 || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
270 || !TEST_true(EC_KEY_set_group(eckey, group)))
272 EC_GROUP_free(group);
273 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
280 TEST_info("testing %s", OBJ_nid2sn(nid));
283 if (!TEST_true(EC_KEY_generate_key(eckey)))
285 /* create second key */
286 if (!TEST_ptr(wrong_eckey = EC_KEY_new())
287 || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
288 || !TEST_true(EC_KEY_set_group(wrong_eckey, group)))
290 EC_GROUP_free(group);
291 if (!TEST_true(EC_KEY_generate_key(wrong_eckey)))
295 if (!TEST_true(EC_KEY_check_key(eckey)))
298 /* create signature */
299 sig_len = ECDSA_size(eckey);
300 if (!TEST_ptr(signature = OPENSSL_malloc(sig_len))
301 || !TEST_true(ECDSA_sign(0, digest, 20, signature, &sig_len,
305 /* verify signature */
306 if (!TEST_int_eq(ECDSA_verify(0, digest, 20, signature, sig_len,
310 /* verify signature with the wrong key */
311 if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature, sig_len,
316 if (!TEST_int_ne(ECDSA_verify(0, wrong_digest, 20, signature,
321 if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature,
322 sig_len - 1, eckey), 1))
326 * Modify a single byte of the signature: to ensure we don't garble
327 * the ASN1 structure, we read the raw signature and modify a byte in
328 * one of the bignums directly.
331 if (!TEST_ptr(ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)))
334 ECDSA_SIG_get0(ecdsa_sig, &sig_r, &sig_s);
336 /* Store the two BIGNUMs in raw_buf. */
337 r_len = BN_num_bytes(sig_r);
338 s_len = BN_num_bytes(sig_s);
339 bn_len = (degree + 7) / 8;
340 if (!TEST_false(r_len > bn_len)
341 || !TEST_false(s_len > bn_len))
343 buf_len = 2 * bn_len;
344 if (!TEST_ptr(raw_buf = OPENSSL_zalloc(buf_len)))
346 BN_bn2bin(sig_r, raw_buf + bn_len - r_len);
347 BN_bn2bin(sig_s, raw_buf + buf_len - s_len);
349 /* Modify a single byte in the buffer. */
350 offset = raw_buf[10] % buf_len;
351 dirt = raw_buf[11] ? raw_buf[11] : 1;
352 raw_buf[offset] ^= dirt;
354 /* Now read the BIGNUMs back in from raw_buf. */
355 if (!TEST_ptr(modified_sig = ECDSA_SIG_new()))
357 if (!TEST_ptr(modified_r = BN_bin2bn(raw_buf, bn_len, NULL))
358 || !TEST_ptr(modified_s = BN_bin2bn(raw_buf + bn_len,
360 || !TEST_true(ECDSA_SIG_set0(modified_sig,
361 modified_r, modified_s))) {
366 sig_ptr2 = signature;
367 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
368 if (!TEST_false(ECDSA_verify(0, digest, 20, signature, sig_len, eckey)))
371 /* Sanity check: undo the modification and verify signature. */
372 raw_buf[offset] ^= dirt;
373 if (!TEST_ptr(unmodified_r = BN_bin2bn(raw_buf, bn_len, NULL))
374 || !TEST_ptr(unmodified_s = BN_bin2bn(raw_buf + bn_len,
376 || !TEST_true(ECDSA_SIG_set0(modified_sig, unmodified_r,
378 BN_free(unmodified_r);
379 BN_free(unmodified_s);
383 sig_ptr2 = signature;
384 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
385 if (!TEST_true(ECDSA_verify(0, digest, 20, signature, sig_len, eckey)))
390 OPENSSL_free(signature);
394 EC_KEY_free(wrong_eckey);
396 ECDSA_SIG_free(ecdsa_sig);
398 ECDSA_SIG_free(modified_sig);
400 OPENSSL_free(raw_buf);
407 EC_KEY_free(wrong_eckey);
408 ECDSA_SIG_free(ecdsa_sig);
409 ECDSA_SIG_free(modified_sig);
410 OPENSSL_free(signature);
411 OPENSSL_free(raw_buf);
412 OPENSSL_free(curves);
417 void register_tests(void)
419 /* initialize the prng */
420 RAND_seed(rnd_seed, sizeof(rnd_seed));
421 ADD_TEST(x9_62_tests);
422 ADD_TEST(test_builtin);