2 * Copyright 2002-2018 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 */
20 # include <openssl/crypto.h>
21 # include <openssl/bio.h>
22 # include <openssl/evp.h>
23 # include <openssl/bn.h>
24 # include <openssl/ec.h>
25 # ifndef OPENSSL_NO_ENGINE
26 # include <openssl/engine.h>
28 # include <openssl/err.h>
29 # include <openssl/rand.h>
31 /* functions to change the RAND_METHOD */
32 static int fbytes(unsigned char *buf, int num);
34 static RAND_METHOD fake_rand;
35 static const RAND_METHOD *old_rand;
37 static int change_rand(void)
39 /* save old rand method */
40 if (!TEST_ptr(old_rand = RAND_get_rand_method()))
43 fake_rand = *old_rand;
44 /* use own random function */
45 fake_rand.bytes = fbytes;
46 /* set new RAND_METHOD */
47 if (!TEST_true(RAND_set_rand_method(&fake_rand)))
52 static int restore_rand(void)
54 if (!TEST_true(RAND_set_rand_method(old_rand)))
59 static int fbytes_counter = 0, use_fake = 0;
60 static const char *numbers[8] = {
61 "651056770906015076056810763456358567190100156695615665659",
62 "6140507067065001063065065565667405560006161556565665656654",
63 "8763001015071075675010661307616710783570106710677817767166"
65 "7000000175690566466555057817571571075705015757757057795755"
67 "1275552191113212300012030439187146164646146646466749494799",
68 "1542725565216523985789236956265265265235675811949404040041",
69 "1456427555219115346513212300075341203043918714616464614664"
71 "1712787255652165239672857892369562652652652356758119494040"
75 static int fbytes(unsigned char *buf, int num)
81 return old_rand->bytes(buf, num);
85 if (fbytes_counter >= 8)
87 if (!TEST_ptr(tmp = BN_new()))
89 if (!TEST_true(BN_dec2bn(&tmp, numbers[fbytes_counter]))) {
94 if (TEST_int_eq(BN_num_bytes(tmp), num)
95 && TEST_true(BN_bn2bin(tmp, buf)))
101 /* some tests from the X9.62 draft */
102 static int x9_62_test_internal(int nid, const char *r_in, const char *s_in)
105 const char message[] = "abc";
106 unsigned char digest[SHA_DIGEST_LENGTH];
107 unsigned int dgst_len = 0;
110 ECDSA_SIG *signature = NULL;
111 BIGNUM *r = NULL, *s = NULL;
112 BIGNUM *kinv = NULL, *rp = NULL;
113 const BIGNUM *sig_r, *sig_s;
115 if (!TEST_ptr(md_ctx = EVP_MD_CTX_new()))
118 /* get the message digest */
119 if (!TEST_true(EVP_DigestInit(md_ctx, EVP_sha1()))
120 || !TEST_true(EVP_DigestUpdate(md_ctx, (const void *)message, 3))
121 || !TEST_true(EVP_DigestFinal(md_ctx, digest, &dgst_len)))
124 TEST_info("testing %s", OBJ_nid2sn(nid));
127 if (!TEST_ptr(key = EC_KEY_new_by_curve_name(nid)))
130 if (!TEST_true(EC_KEY_generate_key(key)))
133 /* create the signature */
135 /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
136 if (!TEST_true(ECDSA_sign_setup(key, NULL, &kinv, &rp)))
138 if (!TEST_ptr(signature =
139 ECDSA_do_sign_ex(digest, SHA_DIGEST_LENGTH, kinv, rp, key)))
142 /* compare the created signature with the expected signature */
143 if (!TEST_ptr(r = BN_new()) || !TEST_ptr(s = BN_new()))
145 if (!TEST_true(BN_dec2bn(&r, r_in)) || !TEST_true(BN_dec2bn(&s, s_in)))
147 ECDSA_SIG_get0(signature, &sig_r, &sig_s);
148 if (!TEST_BN_eq(sig_r, r)
149 || !TEST_BN_eq(sig_s, s))
152 /* verify the signature */
153 if (!TEST_int_eq(ECDSA_do_verify(digest, SHA_DIGEST_LENGTH,
161 ECDSA_SIG_free(signature);
164 EVP_MD_CTX_free(md_ctx);
170 static int x9_62_tests(void)
174 /* set own rand method */
178 if (!TEST_true(x9_62_test_internal(NID_X9_62_prime192v1,
179 "3342403536405981729393488334694600415596881826869351677613",
180 "5735822328888155254683894997897571951568553642892029982342")))
182 if (!TEST_true(x9_62_test_internal(NID_X9_62_prime239v1,
183 "3086361431751678114926225473006680188549593787585317781474"
185 "3238135532097973577080787768312505059318910517550078427819"
189 # ifndef OPENSSL_NO_EC2M
190 if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb191v1,
191 "87194383164871543355722284926904419997237591535066528048",
192 "308992691965804947361541664549085895292153777025772063598")))
194 if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb239v1,
195 "2159633321041961198501834003903461262881815148684178964245"
197 "1970303740007316867383349976549972270528498040721988191026"
204 if (!TEST_true(restore_rand()))
209 static int test_builtin(void)
211 EC_builtin_curve *curves = NULL;
212 size_t crv_len = 0, n = 0;
213 EC_KEY *eckey = NULL, *wrong_eckey = NULL;
215 ECDSA_SIG *ecdsa_sig = NULL, *modified_sig = NULL;
216 unsigned char digest[SHA512_DIGEST_LENGTH];
217 unsigned char wrong_digest[SHA512_DIGEST_LENGTH];
218 unsigned char *signature = NULL;
219 const unsigned char *sig_ptr;
220 unsigned char *sig_ptr2;
221 unsigned char *raw_buf = NULL;
222 const BIGNUM *sig_r, *sig_s;
223 BIGNUM *modified_r = NULL, *modified_s = NULL;
224 BIGNUM *unmodified_r = NULL, *unmodified_s = NULL;
225 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
228 /* fill digest values with some random data */
229 if (!TEST_true(RAND_bytes(digest, SHA512_DIGEST_LENGTH))
230 || !TEST_true(RAND_bytes(wrong_digest, SHA512_DIGEST_LENGTH)))
233 /* create and verify a ecdsa signature with every available curve */
234 /* get a list of all internal curves */
235 crv_len = EC_get_builtin_curves(NULL, 0);
236 if (!TEST_ptr(curves = OPENSSL_malloc(sizeof(*curves) * crv_len))
237 || !TEST_true(EC_get_builtin_curves(curves, crv_len)))
240 /* now create and verify a signature for every curve */
241 for (n = 0; n < crv_len; n++) {
242 unsigned char dirt, offset;
245 if (nid == NID_ipsec4 || nid == NID_ipsec3)
247 /* create new ecdsa key (== EC_KEY) */
248 if (!TEST_ptr(eckey = EC_KEY_new())
249 || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
250 || !TEST_true(EC_KEY_set_group(eckey, group)))
252 EC_GROUP_free(group);
253 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
255 TEST_info("testing %s", OBJ_nid2sn(nid));
258 if (!TEST_true(EC_KEY_generate_key(eckey)))
260 /* create second key */
261 if (!TEST_ptr(wrong_eckey = EC_KEY_new())
262 || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
263 || !TEST_true(EC_KEY_set_group(wrong_eckey, group)))
265 EC_GROUP_free(group);
266 if (!TEST_true(EC_KEY_generate_key(wrong_eckey)))
270 if (!TEST_true(EC_KEY_check_key(eckey)))
273 /* create signature */
274 sig_len = ECDSA_size(eckey);
275 if (!TEST_ptr(signature = OPENSSL_malloc(sig_len))
276 || !TEST_true(ECDSA_sign(0, digest, SHA512_DIGEST_LENGTH,
277 signature, &sig_len, eckey)))
280 /* verify signature */
281 if (!TEST_int_eq(ECDSA_verify(0, digest, SHA512_DIGEST_LENGTH,
282 signature, sig_len, eckey),
286 /* verify signature with the wrong key */
287 if (!TEST_int_ne(ECDSA_verify(0, digest, SHA512_DIGEST_LENGTH,
288 signature, sig_len, wrong_eckey),
293 if (!TEST_int_ne(ECDSA_verify(0, wrong_digest, SHA512_DIGEST_LENGTH,
294 signature, sig_len, eckey),
299 if (!TEST_int_ne(ECDSA_verify(0, digest, SHA512_DIGEST_LENGTH,
300 signature, sig_len - 1, eckey),
305 * Modify a single byte of the signature: to ensure we don't garble
306 * the ASN1 structure, we read the raw signature and modify a byte in
307 * one of the bignums directly.
310 if (!TEST_ptr(ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)))
313 ECDSA_SIG_get0(ecdsa_sig, &sig_r, &sig_s);
315 /* Store the two BIGNUMs in raw_buf. */
316 r_len = BN_num_bytes(sig_r);
317 s_len = BN_num_bytes(sig_s);
318 bn_len = (degree + 7) / 8;
319 if (!TEST_false(r_len > bn_len)
320 || !TEST_false(s_len > bn_len))
322 buf_len = 2 * bn_len;
323 if (!TEST_ptr(raw_buf = OPENSSL_zalloc(buf_len)))
325 BN_bn2bin(sig_r, raw_buf + bn_len - r_len);
326 BN_bn2bin(sig_s, raw_buf + buf_len - s_len);
328 /* Modify a single byte in the buffer. */
329 offset = raw_buf[10] % buf_len;
330 dirt = raw_buf[11] ? raw_buf[11] : 1;
331 raw_buf[offset] ^= dirt;
333 /* Now read the BIGNUMs back in from raw_buf. */
334 if (!TEST_ptr(modified_sig = ECDSA_SIG_new()))
336 if (!TEST_ptr(modified_r = BN_bin2bn(raw_buf, bn_len, NULL))
337 || !TEST_ptr(modified_s = BN_bin2bn(raw_buf + bn_len,
339 || !TEST_true(ECDSA_SIG_set0(modified_sig,
340 modified_r, modified_s))) {
345 sig_ptr2 = signature;
346 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
347 if (!TEST_false(ECDSA_verify(0, digest, SHA512_DIGEST_LENGTH,
348 signature, sig_len, eckey)))
351 /* Sanity check: undo the modification and verify signature. */
352 raw_buf[offset] ^= dirt;
353 if (!TEST_ptr(unmodified_r = BN_bin2bn(raw_buf, bn_len, NULL))
354 || !TEST_ptr(unmodified_s = BN_bin2bn(raw_buf + bn_len,
356 || !TEST_true(ECDSA_SIG_set0(modified_sig, unmodified_r,
358 BN_free(unmodified_r);
359 BN_free(unmodified_s);
363 sig_ptr2 = signature;
364 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
365 if (!TEST_true(ECDSA_verify(0, digest, SHA512_DIGEST_LENGTH,
366 signature, sig_len, eckey)))
371 OPENSSL_free(signature);
375 EC_KEY_free(wrong_eckey);
377 ECDSA_SIG_free(ecdsa_sig);
379 ECDSA_SIG_free(modified_sig);
381 OPENSSL_free(raw_buf);
388 EC_KEY_free(wrong_eckey);
389 ECDSA_SIG_free(ecdsa_sig);
390 ECDSA_SIG_free(modified_sig);
391 OPENSSL_free(signature);
392 OPENSSL_free(raw_buf);
393 OPENSSL_free(curves);
399 int setup_tests(void)
402 TEST_note("Elliptic curves are disabled.");
404 ADD_TEST(x9_62_tests);
405 ADD_TEST(test_builtin);