2 * Copyright 2002-2019 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
11 #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_EC is defined */
16 # include <openssl/evp.h>
17 # include <openssl/bn.h>
18 # include <openssl/ec.h>
19 # include <openssl/rand.h>
20 # include "internal/nelem.h"
21 # include "ecdsatest.h"
23 /* functions to change the RAND_METHOD */
24 static int fbytes(unsigned char *buf
, int num
);
26 static RAND_METHOD fake_rand
;
27 static const RAND_METHOD
*old_rand
;
28 static int use_fake
= 0;
29 static const char *numbers
[2];
30 static size_t crv_len
= 0;
31 static EC_builtin_curve
*curves
= NULL
;
33 static int change_rand(void)
35 /* save old rand method */
36 if (!TEST_ptr(old_rand
= RAND_get_rand_method()))
39 fake_rand
= *old_rand
;
40 /* use own random function */
41 fake_rand
.bytes
= fbytes
;
42 /* set new RAND_METHOD */
43 if (!TEST_true(RAND_set_rand_method(&fake_rand
)))
48 static int restore_rand(void)
50 if (!TEST_true(RAND_set_rand_method(old_rand
)))
55 static int fbytes(unsigned char *buf
, int num
)
58 static int fbytes_counter
= 0;
62 return old_rand
->bytes(buf
, num
);
66 if (!TEST_ptr(tmp
= BN_new())
67 || !TEST_int_lt(fbytes_counter
, OSSL_NELEM(numbers
))
68 || !TEST_true(BN_hex2bn(&tmp
, numbers
[fbytes_counter
]))
69 /* tmp might need leading zeros so pad it out */
70 || !TEST_int_le(BN_num_bytes(tmp
), num
)
71 || !TEST_true(BN_bn2binpad(tmp
, buf
, num
)))
74 fbytes_counter
= (fbytes_counter
+ 1) % OSSL_NELEM(numbers
);
82 * This function hijacks the RNG to feed it the chosen ECDSA key and nonce.
83 * The ECDSA KATs are from:
84 * - the X9.62 draft (4)
87 * It uses the low-level ECDSA_sign_setup instead of EVP to control the RNG.
88 * NB: This is not how applications should use ECDSA; this is only for testing.
90 * Tests the library can successfully:
91 * - generate public keys that matches those KATs
92 * - create ECDSA signatures that match those KATs
93 * - accept those signatures as valid
95 static int x9_62_tests(int n
)
97 int nid
, md_nid
, ret
= 0;
98 const char *r_in
= NULL
, *s_in
= NULL
, *tbs
= NULL
;
99 unsigned char *pbuf
= NULL
, *qbuf
= NULL
, *message
= NULL
;
100 unsigned char digest
[EVP_MAX_MD_SIZE
];
101 unsigned int dgst_len
= 0;
102 long q_len
, msg_len
= 0;
104 EVP_MD_CTX
*mctx
= NULL
;
106 ECDSA_SIG
*signature
= NULL
;
107 BIGNUM
*r
= NULL
, *s
= NULL
;
108 BIGNUM
*kinv
= NULL
, *rp
= NULL
;
109 const BIGNUM
*sig_r
= NULL
, *sig_s
= NULL
;
111 nid
= ecdsa_cavs_kats
[n
].nid
;
112 md_nid
= ecdsa_cavs_kats
[n
].md_nid
;
113 r_in
= ecdsa_cavs_kats
[n
].r
;
114 s_in
= ecdsa_cavs_kats
[n
].s
;
115 tbs
= ecdsa_cavs_kats
[n
].msg
;
116 numbers
[0] = ecdsa_cavs_kats
[n
].d
;
117 numbers
[1] = ecdsa_cavs_kats
[n
].k
;
119 TEST_info("ECDSA KATs for curve %s", OBJ_nid2sn(nid
));
121 if (!TEST_ptr(mctx
= EVP_MD_CTX_new())
122 /* get the message digest */
123 || !TEST_ptr(message
= OPENSSL_hexstr2buf(tbs
, &msg_len
))
124 || !TEST_true(EVP_DigestInit_ex(mctx
, EVP_get_digestbynid(md_nid
), NULL
))
125 || !TEST_true(EVP_DigestUpdate(mctx
, message
, msg_len
))
126 || !TEST_true(EVP_DigestFinal_ex(mctx
, digest
, &dgst_len
))
128 || !TEST_ptr(key
= EC_KEY_new_by_curve_name(nid
))
129 /* load KAT variables */
130 || !TEST_ptr(r
= BN_new())
131 || !TEST_ptr(s
= BN_new())
132 || !TEST_true(BN_hex2bn(&r
, r_in
))
133 || !TEST_true(BN_hex2bn(&s
, s_in
))
134 /* swap the RNG source */
135 || !TEST_true(change_rand()))
138 /* public key must match KAT */
140 if (!TEST_true(EC_KEY_generate_key(key
))
141 || !TEST_true(p_len
= EC_KEY_key2buf(key
, POINT_CONVERSION_UNCOMPRESSED
,
143 || !TEST_ptr(qbuf
= OPENSSL_hexstr2buf(ecdsa_cavs_kats
[n
].Q
, &q_len
))
144 || !TEST_int_eq(q_len
, p_len
)
145 || !TEST_mem_eq(qbuf
, q_len
, pbuf
, p_len
))
148 /* create the signature via ECDSA_sign_setup to avoid use of ECDSA nonces */
150 if (!TEST_true(ECDSA_sign_setup(key
, NULL
, &kinv
, &rp
))
151 || !TEST_ptr(signature
= ECDSA_do_sign_ex(digest
, dgst_len
,
153 /* verify the signature */
154 || !TEST_int_eq(ECDSA_do_verify(digest
, dgst_len
, signature
, key
), 1))
157 /* compare the created signature with the expected signature */
158 ECDSA_SIG_get0(signature
, &sig_r
, &sig_s
);
159 if (!TEST_BN_eq(sig_r
, r
)
160 || !TEST_BN_eq(sig_s
, s
))
166 /* restore the RNG source */
167 if (!TEST_true(restore_rand()))
170 OPENSSL_free(message
);
174 ECDSA_SIG_free(signature
);
177 EVP_MD_CTX_free(mctx
);
184 * Positive and negative ECDSA testing through EVP interface:
185 * - EVP_DigestSign (this is the one-shot version)
188 * Tests the library can successfully:
190 * - create a signature
191 * - accept that signature
192 * - reject that signature with a different public key
193 * - reject that signature if its length is not correct
194 * - reject that signature after modifying the message
195 * - accept that signature after un-modifying the message
196 * - reject that signature after modifying the signature
197 * - accept that signature after un-modifying the signature
199 static int test_builtin(int n
)
201 EC_KEY
*eckey_neg
= NULL
, *eckey
= NULL
;
202 unsigned char dirt
, offset
, tbs
[128];
203 unsigned char *sig
= NULL
;
204 EVP_PKEY
*pkey_neg
= NULL
, *pkey
= NULL
;
205 EVP_MD_CTX
*mctx
= NULL
;
211 /* skip built-in curves where ord(G) is not prime */
212 if (nid
== NID_ipsec4
|| nid
== NID_ipsec3
) {
213 TEST_info("skipped: ECDSA unsupported for curve %s", OBJ_nid2sn(nid
));
217 TEST_info("testing ECDSA for curve %s", OBJ_nid2sn(nid
));
219 if (!TEST_ptr(mctx
= EVP_MD_CTX_new())
220 /* get some random message data */
221 || !TEST_true(RAND_bytes(tbs
, sizeof(tbs
)))
223 || !TEST_ptr(eckey
= EC_KEY_new_by_curve_name(nid
))
224 || !TEST_true(EC_KEY_generate_key(eckey
))
225 || !TEST_ptr(pkey
= EVP_PKEY_new())
226 || !TEST_true(EVP_PKEY_assign_EC_KEY(pkey
, eckey
))
227 /* fake key for negative testing */
228 || !TEST_ptr(eckey_neg
= EC_KEY_new_by_curve_name(nid
))
229 || !TEST_true(EC_KEY_generate_key(eckey_neg
))
230 || !TEST_ptr(pkey_neg
= EVP_PKEY_new())
231 || !TEST_true(EVP_PKEY_assign_EC_KEY(pkey_neg
, eckey_neg
)))
234 sig_len
= ECDSA_size(eckey
);
236 if (!TEST_ptr(sig
= OPENSSL_malloc(sig_len
))
237 /* create a signature */
238 || !TEST_true(EVP_DigestSignInit(mctx
, NULL
, NULL
, NULL
, pkey
))
239 || !TEST_true(EVP_DigestSign(mctx
, sig
, &sig_len
, tbs
, sizeof(tbs
)))
240 || !TEST_int_le(sig_len
, ECDSA_size(eckey
))
241 /* negative test, verify with wrong key, 0 return */
242 || !TEST_true(EVP_MD_CTX_reset(mctx
))
243 || !TEST_true(EVP_DigestVerifyInit(mctx
, NULL
, NULL
, NULL
, pkey_neg
))
244 || !TEST_int_eq(EVP_DigestVerify(mctx
, sig
, sig_len
, tbs
, sizeof(tbs
)), 0)
245 /* negative test, verify with wrong signature length, -1 return */
246 || !TEST_true(EVP_MD_CTX_reset(mctx
))
247 || !TEST_true(EVP_DigestVerifyInit(mctx
, NULL
, NULL
, NULL
, pkey
))
248 || !TEST_int_eq(EVP_DigestVerify(mctx
, sig
, sig_len
- 1, tbs
, sizeof(tbs
)), -1)
249 /* positive test, verify with correct key, 1 return */
250 || !TEST_true(EVP_MD_CTX_reset(mctx
))
251 || !TEST_true(EVP_DigestVerifyInit(mctx
, NULL
, NULL
, NULL
, pkey
))
252 || !TEST_int_eq(EVP_DigestVerify(mctx
, sig
, sig_len
, tbs
, sizeof(tbs
)), 1))
255 /* muck with the message, test it fails with 0 return */
257 if (!TEST_true(EVP_MD_CTX_reset(mctx
))
258 || !TEST_true(EVP_DigestVerifyInit(mctx
, NULL
, NULL
, NULL
, pkey
))
259 || !TEST_int_eq(EVP_DigestVerify(mctx
, sig
, sig_len
, tbs
, sizeof(tbs
)), 0))
261 /* un-muck and test it verifies */
263 if (!TEST_true(EVP_MD_CTX_reset(mctx
))
264 || !TEST_true(EVP_DigestVerifyInit(mctx
, NULL
, NULL
, NULL
, pkey
))
265 || !TEST_int_eq(EVP_DigestVerify(mctx
, sig
, sig_len
, tbs
, sizeof(tbs
)), 1))
269 * Muck with the ECDSA signature. The DER encoding is one of:
273 * - Sometimes this mucks with the high level DER sequence wrapper:
274 * in that case, DER-parsing of the whole signature should fail.
276 * - Sometimes this mucks with the DER-encoding of ECDSA.r:
277 * in that case, DER-parsing of ECDSA.r should fail.
279 * - Sometimes this mucks with the DER-encoding of ECDSA.s:
280 * in that case, DER-parsing of ECDSA.s should fail.
282 * - Sometimes this mucks with ECDSA.r:
283 * in that case, the signature verification should fail.
285 * - Sometimes this mucks with ECDSA.s:
286 * in that case, the signature verification should fail.
288 * The usual case is changing the integer value of ECDSA.r or ECDSA.s.
289 * Because the ratio of DER overhead to signature bytes is small.
290 * So most of the time it will be one of the last two cases.
292 * In any case, EVP_PKEY_verify should not return 1 for valid.
294 offset
= tbs
[0] % sig_len
;
295 dirt
= tbs
[1] ? tbs
[1] : 1;
297 if (!TEST_true(EVP_MD_CTX_reset(mctx
))
298 || !TEST_true(EVP_DigestVerifyInit(mctx
, NULL
, NULL
, NULL
, pkey
))
299 || !TEST_int_ne(EVP_DigestVerify(mctx
, sig
, sig_len
, tbs
, sizeof(tbs
)), 1))
301 /* un-muck and test it verifies */
303 if (!TEST_true(EVP_MD_CTX_reset(mctx
))
304 || !TEST_true(EVP_DigestVerifyInit(mctx
, NULL
, NULL
, NULL
, pkey
))
305 || !TEST_int_eq(EVP_DigestVerify(mctx
, sig
, sig_len
, tbs
, sizeof(tbs
)), 1))
311 EVP_PKEY_free(pkey_neg
);
312 EVP_MD_CTX_free(mctx
);
318 int setup_tests(void)
321 TEST_note("Elliptic curves are disabled.");
323 /* get a list of all internal curves */
324 crv_len
= EC_get_builtin_curves(NULL
, 0);
325 if (!TEST_ptr(curves
= OPENSSL_malloc(sizeof(*curves
) * crv_len
))
326 || !TEST_true(EC_get_builtin_curves(curves
, crv_len
)))
328 ADD_ALL_TESTS(test_builtin
, crv_len
);
329 ADD_ALL_TESTS(x9_62_tests
, OSSL_NELEM(ecdsa_cavs_kats
));
334 void cleanup_tests(void)
336 #ifndef OPENSSL_NO_EC
337 OPENSSL_free(curves
);