1 /*
2 * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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
8 */
9
10 /*
11 * ECDH and ECDSA low level APIs are deprecated for public use, but still ok
12 * for internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <string.h>
17 #include <openssl/ec.h>
18 #ifndef FIPS_MODULE
19 # include <openssl/engine.h>
20 #endif
21 #include <openssl/err.h>
22 #include "ec_local.h"
23
24
25 static const EC_KEY_METHOD openssl_ec_key_method = {
26 "OpenSSL EC_KEY method",
27 0,
28 0,0,0,0,0,0,
29 ossl_ec_key_gen,
30 ossl_ecdh_compute_key,
31 ossl_ecdsa_sign,
32 ossl_ecdsa_sign_setup,
33 ossl_ecdsa_sign_sig,
34 ossl_ecdsa_verify,
35 ossl_ecdsa_verify_sig
36 };
37
38 static const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;
39
EC_KEY_OpenSSL(void)40 const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
41 {
42 return &openssl_ec_key_method;
43 }
44
EC_KEY_get_default_method(void)45 const EC_KEY_METHOD *EC_KEY_get_default_method(void)
46 {
47 return default_ec_key_meth;
48 }
49
EC_KEY_set_default_method(const EC_KEY_METHOD * meth)50 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
51 {
52 if (meth == NULL)
53 default_ec_key_meth = &openssl_ec_key_method;
54 else
55 default_ec_key_meth = meth;
56 }
57
EC_KEY_get_method(const EC_KEY * key)58 const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key)
59 {
60 return key->meth;
61 }
62
EC_KEY_set_method(EC_KEY * key,const EC_KEY_METHOD * meth)63 int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth)
64 {
65 void (*finish)(EC_KEY *key) = key->meth->finish;
66
67 if (finish != NULL)
68 finish(key);
69
70 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
71 ENGINE_finish(key->engine);
72 key->engine = NULL;
73 #endif
74
75 key->meth = meth;
76 if (meth->init != NULL)
77 return meth->init(key);
78 return 1;
79 }
80
ossl_ec_key_new_method_int(OSSL_LIB_CTX * libctx,const char * propq,ENGINE * engine)81 EC_KEY *ossl_ec_key_new_method_int(OSSL_LIB_CTX *libctx, const char *propq,
82 ENGINE *engine)
83 {
84 EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
85
86 if (ret == NULL) {
87 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
88 return NULL;
89 }
90
91 ret->libctx = libctx;
92 if (propq != NULL) {
93 ret->propq = OPENSSL_strdup(propq);
94 if (ret->propq == NULL) {
95 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
96 goto err;
97 }
98 }
99
100 ret->references = 1;
101 ret->lock = CRYPTO_THREAD_lock_new();
102 if (ret->lock == NULL) {
103 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
104 goto err;
105 }
106
107 ret->meth = EC_KEY_get_default_method();
108 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
109 if (engine != NULL) {
110 if (!ENGINE_init(engine)) {
111 ERR_raise(ERR_LIB_EC, ERR_R_ENGINE_LIB);
112 goto err;
113 }
114 ret->engine = engine;
115 } else
116 ret->engine = ENGINE_get_default_EC();
117 if (ret->engine != NULL) {
118 ret->meth = ENGINE_get_EC(ret->engine);
119 if (ret->meth == NULL) {
120 ERR_raise(ERR_LIB_EC, ERR_R_ENGINE_LIB);
121 goto err;
122 }
123 }
124 #endif
125
126 ret->version = 1;
127 ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
128
129 /* No ex_data inside the FIPS provider */
130 #ifndef FIPS_MODULE
131 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
132 goto err;
133 }
134 #endif
135
136 if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
137 ERR_raise(ERR_LIB_EC, ERR_R_INIT_FAIL);
138 goto err;
139 }
140 return ret;
141
142 err:
143 EC_KEY_free(ret);
144 return NULL;
145 }
146
147 #ifndef FIPS_MODULE
EC_KEY_new_method(ENGINE * engine)148 EC_KEY *EC_KEY_new_method(ENGINE *engine)
149 {
150 return ossl_ec_key_new_method_int(NULL, NULL, engine);
151 }
152 #endif
153
ECDH_compute_key(void * out,size_t outlen,const EC_POINT * pub_key,const EC_KEY * eckey,void * (* KDF)(const void * in,size_t inlen,void * out,size_t * outlen))154 int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
155 const EC_KEY *eckey,
156 void *(*KDF) (const void *in, size_t inlen, void *out,
157 size_t *outlen))
158 {
159 unsigned char *sec = NULL;
160 size_t seclen;
161 if (eckey->meth->compute_key == NULL) {
162 ERR_raise(ERR_LIB_EC, EC_R_OPERATION_NOT_SUPPORTED);
163 return 0;
164 }
165 if (outlen > INT_MAX) {
166 ERR_raise(ERR_LIB_EC, EC_R_INVALID_OUTPUT_LENGTH);
167 return 0;
168 }
169 if (!eckey->meth->compute_key(&sec, &seclen, pub_key, eckey))
170 return 0;
171 if (KDF != NULL) {
172 KDF(sec, seclen, out, &outlen);
173 } else {
174 if (outlen > seclen)
175 outlen = seclen;
176 memcpy(out, sec, outlen);
177 }
178 OPENSSL_clear_free(sec, seclen);
179 return outlen;
180 }
181
EC_KEY_METHOD_new(const EC_KEY_METHOD * meth)182 EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
183 {
184 EC_KEY_METHOD *ret = OPENSSL_zalloc(sizeof(*meth));
185
186 if (ret == NULL)
187 return NULL;
188 if (meth != NULL)
189 *ret = *meth;
190 ret->flags |= EC_KEY_METHOD_DYNAMIC;
191 return ret;
192 }
193
EC_KEY_METHOD_free(EC_KEY_METHOD * meth)194 void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
195 {
196 if (meth->flags & EC_KEY_METHOD_DYNAMIC)
197 OPENSSL_free(meth);
198 }
199
EC_KEY_METHOD_set_init(EC_KEY_METHOD * meth,int (* init)(EC_KEY * key),void (* finish)(EC_KEY * key),int (* copy)(EC_KEY * dest,const EC_KEY * src),int (* set_group)(EC_KEY * key,const EC_GROUP * grp),int (* set_private)(EC_KEY * key,const BIGNUM * priv_key),int (* set_public)(EC_KEY * key,const EC_POINT * pub_key))200 void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
201 int (*init)(EC_KEY *key),
202 void (*finish)(EC_KEY *key),
203 int (*copy)(EC_KEY *dest, const EC_KEY *src),
204 int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
205 int (*set_private)(EC_KEY *key,
206 const BIGNUM *priv_key),
207 int (*set_public)(EC_KEY *key,
208 const EC_POINT *pub_key))
209 {
210 meth->init = init;
211 meth->finish = finish;
212 meth->copy = copy;
213 meth->set_group = set_group;
214 meth->set_private = set_private;
215 meth->set_public = set_public;
216 }
217
EC_KEY_METHOD_set_keygen(EC_KEY_METHOD * meth,int (* keygen)(EC_KEY * key))218 void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
219 int (*keygen)(EC_KEY *key))
220 {
221 meth->keygen = keygen;
222 }
223
EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD * meth,int (* ckey)(unsigned char ** psec,size_t * pseclen,const EC_POINT * pub_key,const EC_KEY * ecdh))224 void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
225 int (*ckey)(unsigned char **psec,
226 size_t *pseclen,
227 const EC_POINT *pub_key,
228 const EC_KEY *ecdh))
229 {
230 meth->compute_key = ckey;
231 }
232
EC_KEY_METHOD_set_sign(EC_KEY_METHOD * meth,int (* sign)(int type,const unsigned char * dgst,int dlen,unsigned char * sig,unsigned int * siglen,const BIGNUM * kinv,const BIGNUM * r,EC_KEY * eckey),int (* sign_setup)(EC_KEY * eckey,BN_CTX * ctx_in,BIGNUM ** kinvp,BIGNUM ** rp),ECDSA_SIG * (* sign_sig)(const unsigned char * dgst,int dgst_len,const BIGNUM * in_kinv,const BIGNUM * in_r,EC_KEY * eckey))233 void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
234 int (*sign)(int type, const unsigned char *dgst,
235 int dlen, unsigned char *sig,
236 unsigned int *siglen,
237 const BIGNUM *kinv, const BIGNUM *r,
238 EC_KEY *eckey),
239 int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
240 BIGNUM **kinvp, BIGNUM **rp),
241 ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
242 int dgst_len,
243 const BIGNUM *in_kinv,
244 const BIGNUM *in_r,
245 EC_KEY *eckey))
246 {
247 meth->sign = sign;
248 meth->sign_setup = sign_setup;
249 meth->sign_sig = sign_sig;
250 }
251
EC_KEY_METHOD_set_verify(EC_KEY_METHOD * meth,int (* verify)(int type,const unsigned char * dgst,int dgst_len,const unsigned char * sigbuf,int sig_len,EC_KEY * eckey),int (* verify_sig)(const unsigned char * dgst,int dgst_len,const ECDSA_SIG * sig,EC_KEY * eckey))252 void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
253 int (*verify)(int type, const unsigned
254 char *dgst, int dgst_len,
255 const unsigned char *sigbuf,
256 int sig_len, EC_KEY *eckey),
257 int (*verify_sig)(const unsigned char *dgst,
258 int dgst_len,
259 const ECDSA_SIG *sig,
260 EC_KEY *eckey))
261 {
262 meth->verify = verify;
263 meth->verify_sig = verify_sig;
264 }
265
EC_KEY_METHOD_get_init(const EC_KEY_METHOD * meth,int (** pinit)(EC_KEY * key),void (** pfinish)(EC_KEY * key),int (** pcopy)(EC_KEY * dest,const EC_KEY * src),int (** pset_group)(EC_KEY * key,const EC_GROUP * grp),int (** pset_private)(EC_KEY * key,const BIGNUM * priv_key),int (** pset_public)(EC_KEY * key,const EC_POINT * pub_key))266 void EC_KEY_METHOD_get_init(const EC_KEY_METHOD *meth,
267 int (**pinit)(EC_KEY *key),
268 void (**pfinish)(EC_KEY *key),
269 int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
270 int (**pset_group)(EC_KEY *key,
271 const EC_GROUP *grp),
272 int (**pset_private)(EC_KEY *key,
273 const BIGNUM *priv_key),
274 int (**pset_public)(EC_KEY *key,
275 const EC_POINT *pub_key))
276 {
277 if (pinit != NULL)
278 *pinit = meth->init;
279 if (pfinish != NULL)
280 *pfinish = meth->finish;
281 if (pcopy != NULL)
282 *pcopy = meth->copy;
283 if (pset_group != NULL)
284 *pset_group = meth->set_group;
285 if (pset_private != NULL)
286 *pset_private = meth->set_private;
287 if (pset_public != NULL)
288 *pset_public = meth->set_public;
289 }
290
EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD * meth,int (** pkeygen)(EC_KEY * key))291 void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
292 int (**pkeygen)(EC_KEY *key))
293 {
294 if (pkeygen != NULL)
295 *pkeygen = meth->keygen;
296 }
297
EC_KEY_METHOD_get_compute_key(const EC_KEY_METHOD * meth,int (** pck)(unsigned char ** pout,size_t * poutlen,const EC_POINT * pub_key,const EC_KEY * ecdh))298 void EC_KEY_METHOD_get_compute_key(const EC_KEY_METHOD *meth,
299 int (**pck)(unsigned char **pout,
300 size_t *poutlen,
301 const EC_POINT *pub_key,
302 const EC_KEY *ecdh))
303 {
304 if (pck != NULL)
305 *pck = meth->compute_key;
306 }
307
EC_KEY_METHOD_get_sign(const EC_KEY_METHOD * meth,int (** psign)(int type,const unsigned char * dgst,int dlen,unsigned char * sig,unsigned int * siglen,const BIGNUM * kinv,const BIGNUM * r,EC_KEY * eckey),int (** psign_setup)(EC_KEY * eckey,BN_CTX * ctx_in,BIGNUM ** kinvp,BIGNUM ** rp),ECDSA_SIG * (** psign_sig)(const unsigned char * dgst,int dgst_len,const BIGNUM * in_kinv,const BIGNUM * in_r,EC_KEY * eckey))308 void EC_KEY_METHOD_get_sign(const EC_KEY_METHOD *meth,
309 int (**psign)(int type, const unsigned char *dgst,
310 int dlen, unsigned char *sig,
311 unsigned int *siglen,
312 const BIGNUM *kinv, const BIGNUM *r,
313 EC_KEY *eckey),
314 int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
315 BIGNUM **kinvp, BIGNUM **rp),
316 ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
317 int dgst_len,
318 const BIGNUM *in_kinv,
319 const BIGNUM *in_r,
320 EC_KEY *eckey))
321 {
322 if (psign != NULL)
323 *psign = meth->sign;
324 if (psign_setup != NULL)
325 *psign_setup = meth->sign_setup;
326 if (psign_sig != NULL)
327 *psign_sig = meth->sign_sig;
328 }
329
EC_KEY_METHOD_get_verify(const EC_KEY_METHOD * meth,int (** pverify)(int type,const unsigned char * dgst,int dgst_len,const unsigned char * sigbuf,int sig_len,EC_KEY * eckey),int (** pverify_sig)(const unsigned char * dgst,int dgst_len,const ECDSA_SIG * sig,EC_KEY * eckey))330 void EC_KEY_METHOD_get_verify(const EC_KEY_METHOD *meth,
331 int (**pverify)(int type, const unsigned
332 char *dgst, int dgst_len,
333 const unsigned char *sigbuf,
334 int sig_len, EC_KEY *eckey),
335 int (**pverify_sig)(const unsigned char *dgst,
336 int dgst_len,
337 const ECDSA_SIG *sig,
338 EC_KEY *eckey))
339 {
340 if (pverify != NULL)
341 *pverify = meth->verify;
342 if (pverify_sig != NULL)
343 *pverify_sig = meth->verify_sig;
344 }
345