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.
12 * Portions originally developed by SUN MICROSYSTEMS, INC., and
13 * contributed to the OpenSSL project.
16 #include <internal/cryptlib.h>
19 #include <openssl/err.h>
20 #include <openssl/engine.h>
22 EC_KEY *EC_KEY_new(void)
24 return EC_KEY_new_method(NULL);
27 EC_KEY *EC_KEY_new_by_curve_name(int nid)
29 EC_KEY *ret = EC_KEY_new();
32 ret->group = EC_GROUP_new_by_curve_name(nid);
33 if (ret->group == NULL) {
37 if (ret->meth->set_group != NULL
38 && ret->meth->set_group(ret, ret->group) == 0) {
45 void EC_KEY_free(EC_KEY *r)
52 CRYPTO_DOWN_REF(&r->references, &i, r->lock);
53 REF_PRINT_COUNT("EC_KEY", r);
56 REF_ASSERT_ISNT(i < 0);
58 if (r->meth->finish != NULL)
61 #ifndef OPENSSL_NO_ENGINE
62 ENGINE_finish(r->engine);
65 if (r->group && r->group->meth->keyfinish)
66 r->group->meth->keyfinish(r);
68 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data);
69 CRYPTO_THREAD_lock_free(r->lock);
70 EC_GROUP_free(r->group);
71 EC_POINT_free(r->pub_key);
72 BN_clear_free(r->priv_key);
74 OPENSSL_clear_free((void *)r, sizeof(EC_KEY));
77 EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
79 if (dest == NULL || src == NULL) {
80 ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
83 if (src->meth != dest->meth) {
84 if (dest->meth->finish != NULL)
85 dest->meth->finish(dest);
86 if (dest->group && dest->group->meth->keyfinish)
87 dest->group->meth->keyfinish(dest);
88 #ifndef OPENSSL_NO_ENGINE
89 if (ENGINE_finish(dest->engine) == 0)
94 /* copy the parameters */
95 if (src->group != NULL) {
96 const EC_METHOD *meth = EC_GROUP_method_of(src->group);
97 /* clear the old group */
98 EC_GROUP_free(dest->group);
99 dest->group = EC_GROUP_new(meth);
100 if (dest->group == NULL)
102 if (!EC_GROUP_copy(dest->group, src->group))
105 /* copy the public key */
106 if (src->pub_key != NULL) {
107 EC_POINT_free(dest->pub_key);
108 dest->pub_key = EC_POINT_new(src->group);
109 if (dest->pub_key == NULL)
111 if (!EC_POINT_copy(dest->pub_key, src->pub_key))
114 /* copy the private key */
115 if (src->priv_key != NULL) {
116 if (dest->priv_key == NULL) {
117 dest->priv_key = BN_new();
118 if (dest->priv_key == NULL)
121 if (!BN_copy(dest->priv_key, src->priv_key))
123 if (src->group->meth->keycopy
124 && src->group->meth->keycopy(dest, src) == 0)
131 dest->enc_flag = src->enc_flag;
132 dest->conv_form = src->conv_form;
133 dest->version = src->version;
134 dest->flags = src->flags;
135 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY,
136 &dest->ex_data, &src->ex_data))
139 if (src->meth != dest->meth) {
140 #ifndef OPENSSL_NO_ENGINE
141 if (src->engine != NULL && ENGINE_init(src->engine) == 0)
143 dest->engine = src->engine;
145 dest->meth = src->meth;
148 if (src->meth->copy != NULL && src->meth->copy(dest, src) == 0)
154 EC_KEY *EC_KEY_dup(const EC_KEY *ec_key)
156 EC_KEY *ret = EC_KEY_new_method(ec_key->engine);
161 if (EC_KEY_copy(ret, ec_key) == NULL) {
168 int EC_KEY_up_ref(EC_KEY *r)
172 if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
175 REF_PRINT_COUNT("EC_KEY", r);
176 REF_ASSERT_ISNT(i < 2);
177 return ((i > 1) ? 1 : 0);
180 ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey)
182 return eckey->engine;
185 int EC_KEY_generate_key(EC_KEY *eckey)
187 if (eckey == NULL || eckey->group == NULL) {
188 ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
191 if (eckey->meth->keygen != NULL)
192 return eckey->meth->keygen(eckey);
193 ECerr(EC_F_EC_KEY_GENERATE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
197 int ossl_ec_key_gen(EC_KEY *eckey)
199 OPENSSL_assert(eckey->group->meth->keygen != NULL);
200 return eckey->group->meth->keygen(eckey);
203 int ec_key_simple_generate_key(EC_KEY *eckey)
207 BIGNUM *priv_key = NULL;
208 const BIGNUM *order = NULL;
209 EC_POINT *pub_key = NULL;
211 if ((ctx = BN_CTX_new()) == NULL)
214 if (eckey->priv_key == NULL) {
216 if (priv_key == NULL)
219 priv_key = eckey->priv_key;
221 order = EC_GROUP_get0_order(eckey->group);
226 if (!BN_rand_range(priv_key, order))
228 while (BN_is_zero(priv_key)) ;
230 if (eckey->pub_key == NULL) {
231 pub_key = EC_POINT_new(eckey->group);
235 pub_key = eckey->pub_key;
237 if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
240 eckey->priv_key = priv_key;
241 eckey->pub_key = pub_key;
246 if (eckey->pub_key == NULL)
247 EC_POINT_free(pub_key);
248 if (eckey->priv_key != priv_key)
254 int ec_key_simple_generate_public_key(EC_KEY *eckey)
256 return EC_POINT_mul(eckey->group, eckey->pub_key, eckey->priv_key, NULL,
260 int EC_KEY_check_key(const EC_KEY *eckey)
262 if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) {
263 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
267 if (eckey->group->meth->keycheck == NULL) {
268 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
272 return eckey->group->meth->keycheck(eckey);
275 int ec_key_simple_check_key(const EC_KEY *eckey)
279 const BIGNUM *order = NULL;
280 EC_POINT *point = NULL;
282 if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) {
283 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
287 if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) {
288 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_AT_INFINITY);
292 if ((ctx = BN_CTX_new()) == NULL)
294 if ((point = EC_POINT_new(eckey->group)) == NULL)
297 /* testing whether the pub_key is on the elliptic curve */
298 if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) {
299 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
302 /* testing whether pub_key * order is the point at infinity */
303 order = eckey->group->order;
304 if (BN_is_zero(order)) {
305 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
308 if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) {
309 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB);
312 if (!EC_POINT_is_at_infinity(eckey->group, point)) {
313 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER);
317 * in case the priv_key is present : check if generator * priv_key ==
320 if (eckey->priv_key != NULL) {
321 if (BN_cmp(eckey->priv_key, order) >= 0) {
322 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER);
325 if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
327 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB);
330 if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) {
331 ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
338 EC_POINT_free(point);
342 int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
347 EC_POINT *point = NULL;
349 #ifndef OPENSSL_NO_EC2M
350 int tmp_nid, is_char_two = 0;
353 if (key == NULL || key->group == NULL || x == NULL || y == NULL) {
354 ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
355 ERR_R_PASSED_NULL_PARAMETER);
363 point = EC_POINT_new(key->group);
368 tx = BN_CTX_get(ctx);
369 ty = BN_CTX_get(ctx);
373 #ifndef OPENSSL_NO_EC2M
374 tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group));
376 if (tmp_nid == NID_X9_62_characteristic_two_field)
380 if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point,
383 if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point,
389 if (!EC_POINT_set_affine_coordinates_GFp(key->group, point,
392 if (!EC_POINT_get_affine_coordinates_GFp(key->group, point,
397 * Check if retrieved coordinates match originals and are less than field
398 * order: if not values are out of range.
400 if (BN_cmp(x, tx) || BN_cmp(y, ty)
401 || (BN_cmp(x, key->group->field) >= 0)
402 || (BN_cmp(y, key->group->field) >= 0)) {
403 ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
404 EC_R_COORDINATES_OUT_OF_RANGE);
408 if (!EC_KEY_set_public_key(key, point))
411 if (EC_KEY_check_key(key) == 0)
419 EC_POINT_free(point);
424 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
429 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
431 if (key->meth->set_group != NULL && key->meth->set_group(key, group) == 0)
433 EC_GROUP_free(key->group);
434 key->group = EC_GROUP_dup(group);
435 return (key->group == NULL) ? 0 : 1;
438 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
440 return key->priv_key;
443 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
445 if (key->group == NULL || key->group->meth == NULL)
447 if (key->group->meth->set_private != NULL
448 && key->group->meth->set_private(key, priv_key) == 0)
450 if (key->meth->set_private != NULL
451 && key->meth->set_private(key, priv_key) == 0)
453 BN_clear_free(key->priv_key);
454 key->priv_key = BN_dup(priv_key);
455 return (key->priv_key == NULL) ? 0 : 1;
458 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
463 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
465 if (key->meth->set_public != NULL
466 && key->meth->set_public(key, pub_key) == 0)
468 EC_POINT_free(key->pub_key);
469 key->pub_key = EC_POINT_dup(pub_key, key->group);
470 return (key->pub_key == NULL) ? 0 : 1;
473 unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
475 return key->enc_flag;
478 void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
480 key->enc_flag = flags;
483 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
485 return key->conv_form;
488 void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
490 key->conv_form = cform;
491 if (key->group != NULL)
492 EC_GROUP_set_point_conversion_form(key->group, cform);
495 void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
497 if (key->group != NULL)
498 EC_GROUP_set_asn1_flag(key->group, flag);
501 int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
503 if (key->group == NULL)
505 return EC_GROUP_precompute_mult(key->group, ctx);
508 int EC_KEY_get_flags(const EC_KEY *key)
513 void EC_KEY_set_flags(EC_KEY *key, int flags)
518 void EC_KEY_clear_flags(EC_KEY *key, int flags)
520 key->flags &= ~flags;
523 size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form,
524 unsigned char **pbuf, BN_CTX *ctx)
526 if (key == NULL || key->pub_key == NULL || key->group == NULL)
528 return EC_POINT_point2buf(key->group, key->pub_key, form, pbuf, ctx);
531 int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
534 if (key == NULL || key->group == NULL)
536 if (key->pub_key == NULL)
537 key->pub_key = EC_POINT_new(key->group);
538 if (key->pub_key == NULL)
540 if (EC_POINT_oct2point(key->group, key->pub_key, buf, len, ctx) == 0)
543 * Save the point conversion form.
544 * For non-custom curves the first octet of the buffer (excluding
545 * the last significant bit) contains the point conversion form.
546 * EC_POINT_oct2point() has already performed sanity checking of
547 * the buffer so we know it is valid.
549 if ((key->group->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0)
550 key->conv_form = (point_conversion_form_t)(buf[0] & ~0x01);
554 size_t EC_KEY_priv2oct(const EC_KEY *eckey,
555 unsigned char *buf, size_t len)
557 if (eckey->group == NULL || eckey->group->meth == NULL)
559 if (eckey->group->meth->priv2oct == NULL) {
560 ECerr(EC_F_EC_KEY_PRIV2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
564 return eckey->group->meth->priv2oct(eckey, buf, len);
567 size_t ec_key_simple_priv2oct(const EC_KEY *eckey,
568 unsigned char *buf, size_t len)
572 buf_len = (EC_GROUP_order_bits(eckey->group) + 7) / 8;
573 if (eckey->priv_key == NULL)
577 else if (len < buf_len)
580 /* Octetstring may need leading zeros if BN is to short */
582 if (BN_bn2binpad(eckey->priv_key, buf, buf_len) == -1) {
583 ECerr(EC_F_EC_KEY_SIMPLE_PRIV2OCT, EC_R_BUFFER_TOO_SMALL);
590 int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len)
592 if (eckey->group == NULL || eckey->group->meth == NULL)
594 if (eckey->group->meth->oct2priv == NULL) {
595 ECerr(EC_F_EC_KEY_OCT2PRIV, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
598 return eckey->group->meth->oct2priv(eckey, buf, len);
601 int ec_key_simple_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len)
603 if (eckey->priv_key == NULL)
604 eckey->priv_key = BN_secure_new();
605 if (eckey->priv_key == NULL) {
606 ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_MALLOC_FAILURE);
609 eckey->priv_key = BN_bin2bn(buf, len, eckey->priv_key);
610 if (eckey->priv_key == NULL) {
611 ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_BN_LIB);
617 size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf)
621 len = EC_KEY_priv2oct(eckey, NULL, 0);
624 buf = OPENSSL_malloc(len);
627 len = EC_KEY_priv2oct(eckey, buf, len);
636 int EC_KEY_can_sign(const EC_KEY *eckey)
638 if (eckey->group == NULL || eckey->group->meth == NULL
639 || (eckey->group->meth->flags & EC_FLAGS_NO_SIGN))