/src/openssl/crypto/ec/ec_kmeth.c

Source (jump to first uncovered line)
/*
 * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <string.h>
#include <openssl/ec.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include "ec_lcl.h"


static const EC_KEY_METHOD openssl_ec_key_method = {
    "OpenSSL EC_KEY method",
    0,
    0,0,0,0,0,0,
    ossl_ec_key_gen,
    ossl_ecdh_compute_key,
    ossl_ecdsa_sign,
    ossl_ecdsa_sign_setup,
    ossl_ecdsa_sign_sig,
    ossl_ecdsa_verify,
    ossl_ecdsa_verify_sig
};

static const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;

const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
{
    return &openssl_ec_key_method;
}

const EC_KEY_METHOD *EC_KEY_get_default_method(void)
{
    return default_ec_key_meth;
}

void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
{
    if (meth == NULL)
        default_ec_key_meth = &openssl_ec_key_method;
    else
        default_ec_key_meth = meth;
}

const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key)
{
    return key->meth;
}

int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth)
{
    void (*finish)(EC_KEY *key) = key->meth->finish;

    if (finish != NULL)
        finish(key);

#ifndef OPENSSL_NO_ENGINE
    ENGINE_finish(key->engine);
    key->engine = NULL;
#endif

    key->meth = meth;
    if (meth->init != NULL)
        return meth->init(key);
    return 1;
}

EC_KEY *EC_KEY_new_method(ENGINE *engine)
{
    EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));

    if (ret == NULL) {
        ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    ret->references = 1;
    ret->lock = CRYPTO_THREAD_lock_new();
    if (ret->lock == NULL) {
        ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
        OPENSSL_free(ret);
        return NULL;
    }

    ret->meth = EC_KEY_get_default_method();
#ifndef OPENSSL_NO_ENGINE
    if (engine != NULL) {
        if (!ENGINE_init(engine)) {
            ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
            goto err;
        }
        ret->engine = engine;
    } else
        ret->engine = ENGINE_get_default_EC();
    if (ret->engine != NULL) {
        ret->meth = ENGINE_get_EC(ret->engine);
        if (ret->meth == NULL) {
            ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
            goto err;
        }
    }
#endif

    ret->version = 1;
    ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;

    if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
        goto err;
    }

    if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
        ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_INIT_FAIL);
        goto err;
    }
    return ret;

err:
    EC_KEY_free(ret);
    return NULL;
}

int 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))
{
    unsigned char *sec = NULL;
    size_t seclen;
    if (eckey->meth->compute_key == NULL) {
        ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
        return 0;
    }
    if (outlen > INT_MAX) {
        ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_INVALID_OUTPUT_LENGTH);
        return 0;
    }
    if (!eckey->meth->compute_key(&sec, &seclen, pub_key, eckey))
        return 0;
    if (KDF != NULL) {
        KDF(sec, seclen, out, &outlen);
    } else {
        if (outlen > seclen)
            outlen = seclen;
        memcpy(out, sec, outlen);
    }
    OPENSSL_clear_free(sec, seclen);
    return outlen;
}

EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
{
    EC_KEY_METHOD *ret = OPENSSL_zalloc(sizeof(*meth));

    if (ret == NULL)
        return NULL;
    if (meth != NULL)
        *ret = *meth;
    ret->flags |= EC_KEY_METHOD_DYNAMIC;
    return ret;
}

void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
{
    if (meth->flags & EC_KEY_METHOD_DYNAMIC)
        OPENSSL_free(meth);
}

void 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))
{
    meth->init = init;
    meth->finish = finish;
    meth->copy = copy;
    meth->set_group = set_group;
    meth->set_private = set_private;
    meth->set_public = set_public;
}

void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
                              int (*keygen)(EC_KEY *key))
{
    meth->keygen = keygen;
}

void 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))
{
    meth->compute_key = ckey;
}

void 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))
{
    meth->sign = sign;
    meth->sign_setup = sign_setup;
    meth->sign_sig = sign_sig;
}

void 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))
{
    meth->verify = verify;
    meth->verify_sig = verify_sig;
}

void 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))
{
    if (pinit != NULL)
        *pinit = meth->init;
    if (pfinish != NULL)
        *pfinish = meth->finish;
    if (pcopy != NULL)
        *pcopy = meth->copy;
    if (pset_group != NULL)
        *pset_group = meth->set_group;
    if (pset_private != NULL)
        *pset_private = meth->set_private;
    if (pset_public != NULL)
        *pset_public = meth->set_public;
}

void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
                              int (**pkeygen)(EC_KEY *key))
{
    if (pkeygen != NULL)
        *pkeygen = meth->keygen;
}

void 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))
{
    if (pck != NULL)
        *pck = meth->compute_key;
}

void 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))
{
    if (psign != NULL)
        *psign = meth->sign;
    if (psign_setup != NULL)
        *psign_setup = meth->sign_setup;
    if (psign_sig != NULL)
        *psign_sig = meth->sign_sig;
}

void 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))
{
    if (pverify != NULL)
        *pverify = meth->verify;
    if (pverify_sig != NULL)
        *pverify_sig = meth->verify_sig;
}

Coverage Report

Created: 2018-08-29 13:53

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
3		*
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
8		*/
9
10		#include <string.h>
11		#include <openssl/ec.h>
12		#include <openssl/engine.h>
13		#include <openssl/err.h>
14		#include "ec_lcl.h"
15
16
17		static const EC_KEY_METHOD openssl_ec_key_method = {
18		"OpenSSL EC_KEY method",
19		0,
20		0,0,0,0,0,0,
21		ossl_ec_key_gen,
22		ossl_ecdh_compute_key,
23		ossl_ecdsa_sign,
24		ossl_ecdsa_sign_setup,
25		ossl_ecdsa_sign_sig,
26		ossl_ecdsa_verify,
27		ossl_ecdsa_verify_sig
28		};
29
30		static const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;
31
32		const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
33	0	{
34	0	return &openssl_ec_key_method;
35	0	}
36
37		const EC_KEY_METHOD *EC_KEY_get_default_method(void)
38	0	{
39	0	return default_ec_key_meth;
40	0	}
41
42		void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
43	0	{
44	0	if (meth == NULL)
45	0	default_ec_key_meth = &openssl_ec_key_method;
46	0	else
47	0	default_ec_key_meth = meth;
48	0	}
49
50		const EC_KEY_METHOD EC_KEY_get_method(const EC_KEY key)
51	0	{
52	0	return key->meth;
53	0	}
54
55		int EC_KEY_set_method(EC_KEY key, const EC_KEY_METHOD meth)
56	0	{
57	0	void (finish)(EC_KEY key) = key->meth->finish;
58	0
59	0	if (finish != NULL)
60	0	finish(key);
61	0
62	0	#ifndef OPENSSL_NO_ENGINE
63	0	ENGINE_finish(key->engine);
64	0	key->engine = NULL;
65	0	#endif
66	0
67	0	key->meth = meth;
68	0	if (meth->init != NULL)
69	0	return meth->init(key);
70	0	return 1;
71	0	}
72
73		EC_KEY EC_KEY_new_method(ENGINE engine)
74	0	{
75	0	EC_KEY ret = OPENSSL_zalloc(sizeof(ret));
76	0
77	0	if (ret == NULL) {
78	0	ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
79	0	return NULL;
80	0	}
81	0
82	0	ret->references = 1;
83	0	ret->lock = CRYPTO_THREAD_lock_new();
84	0	if (ret->lock == NULL) {
85	0	ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
86	0	OPENSSL_free(ret);
87	0	return NULL;
88	0	}
89	0
90	0	ret->meth = EC_KEY_get_default_method();
91	0	#ifndef OPENSSL_NO_ENGINE
92	0	if (engine != NULL) {
93	0	if (!ENGINE_init(engine)) {
94	0	ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
95	0	goto err;
96	0	}
97	0	ret->engine = engine;
98	0	} else
99	0	ret->engine = ENGINE_get_default_EC();
100	0	if (ret->engine != NULL) {
101	0	ret->meth = ENGINE_get_EC(ret->engine);
102	0	if (ret->meth == NULL) {
103	0	ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
104	0	goto err;
105	0	}
106	0	}
107	0	#endif
108	0
109	0	ret->version = 1;
110	0	ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
111	0
112	0	if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
113	0	goto err;
114	0	}
115	0
116	0	if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
117	0	ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_INIT_FAIL);
118	0	goto err;
119	0	}
120	0	return ret;
121	0
122	0	err:
123	0	EC_KEY_free(ret);
124	0	return NULL;
125	0	}
126
127		int ECDH_compute_key(void out, size_t outlen, const EC_POINT pub_key,
128		const EC_KEY *eckey,
129		void (KDF) (const void in, size_t inlen, void out,
130		size_t *outlen))
131	0	{
132	0	unsigned char *sec = NULL;
133	0	size_t seclen;
134	0	if (eckey->meth->compute_key == NULL) {
135	0	ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
136	0	return 0;
137	0	}
138	0	if (outlen > INT_MAX) {
139	0	ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_INVALID_OUTPUT_LENGTH);
140	0	return 0;
141	0	}
142	0	if (!eckey->meth->compute_key(&sec, &seclen, pub_key, eckey))
143	0	return 0;
144	0	if (KDF != NULL) {
145	0	KDF(sec, seclen, out, &outlen);
146	0	} else {
147	0	if (outlen > seclen)
148	0	outlen = seclen;
149	0	memcpy(out, sec, outlen);
150	0	}
151	0	OPENSSL_clear_free(sec, seclen);
152	0	return outlen;
153	0	}
154
155		EC_KEY_METHOD EC_KEY_METHOD_new(const EC_KEY_METHOD meth)
156	0	{
157	0	EC_KEY_METHOD ret = OPENSSL_zalloc(sizeof(meth));
158	0
159	0	if (ret == NULL)
160	0	return NULL;
161	0	if (meth != NULL)
162	0	ret = meth;
163	0	ret->flags \|= EC_KEY_METHOD_DYNAMIC;
164	0	return ret;
165	0	}
166
167		void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
168	0	{
169	0	if (meth->flags & EC_KEY_METHOD_DYNAMIC)
170	0	OPENSSL_free(meth);
171	0	}
172
173		void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
174		int (init)(EC_KEY key),
175		void (finish)(EC_KEY key),
176		int (copy)(EC_KEY dest, const EC_KEY *src),
177		int (set_group)(EC_KEY key, const EC_GROUP *grp),
178		int (set_private)(EC_KEY key,
179		const BIGNUM *priv_key),
180		int (set_public)(EC_KEY key,
181		const EC_POINT *pub_key))
182	0	{
183	0	meth->init = init;
184	0	meth->finish = finish;
185	0	meth->copy = copy;
186	0	meth->set_group = set_group;
187	0	meth->set_private = set_private;
188	0	meth->set_public = set_public;
189	0	}
190
191		void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
192		int (keygen)(EC_KEY key))
193	0	{
194	0	meth->keygen = keygen;
195	0	}
196
197		void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
198		int (ckey)(unsigned char *psec,
199		size_t *pseclen,
200		const EC_POINT *pub_key,
201		const EC_KEY *ecdh))
202	0	{
203	0	meth->compute_key = ckey;
204	0	}
205
206		void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
207		int (sign)(int type, const unsigned char dgst,
208		int dlen, unsigned char *sig,
209		unsigned int *siglen,
210		const BIGNUM kinv, const BIGNUM r,
211		EC_KEY *eckey),
212		int (sign_setup)(EC_KEY eckey, BN_CTX *ctx_in,
213		BIGNUM kinvp, BIGNUM rp),
214		ECDSA_SIG (sign_sig)(const unsigned char *dgst,
215		int dgst_len,
216		const BIGNUM *in_kinv,
217		const BIGNUM *in_r,
218		EC_KEY *eckey))
219	0	{
220	0	meth->sign = sign;
221	0	meth->sign_setup = sign_setup;
222	0	meth->sign_sig = sign_sig;
223	0	}
224
225		void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
226		int (*verify)(int type, const unsigned
227		char *dgst, int dgst_len,
228		const unsigned char *sigbuf,
229		int sig_len, EC_KEY *eckey),
230		int (verify_sig)(const unsigned char dgst,
231		int dgst_len,
232		const ECDSA_SIG *sig,
233		EC_KEY *eckey))
234	0	{
235	0	meth->verify = verify;
236	0	meth->verify_sig = verify_sig;
237	0	}
238
239		void EC_KEY_METHOD_get_init(const EC_KEY_METHOD *meth,
240		int (*pinit)(EC_KEY key),
241		void (*pfinish)(EC_KEY key),
242		int (*pcopy)(EC_KEY dest, const EC_KEY *src),
243		int (*pset_group)(EC_KEY key,
244		const EC_GROUP *grp),
245		int (*pset_private)(EC_KEY key,
246		const BIGNUM *priv_key),
247		int (*pset_public)(EC_KEY key,
248		const EC_POINT *pub_key))
249	0	{
250	0	if (pinit != NULL)
251	0	*pinit = meth->init;
252	0	if (pfinish != NULL)
253	0	*pfinish = meth->finish;
254	0	if (pcopy != NULL)
255	0	*pcopy = meth->copy;
256	0	if (pset_group != NULL)
257	0	*pset_group = meth->set_group;
258	0	if (pset_private != NULL)
259	0	*pset_private = meth->set_private;
260	0	if (pset_public != NULL)
261	0	*pset_public = meth->set_public;
262	0	}
263
264		void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
265		int (*pkeygen)(EC_KEY key))
266	0	{
267	0	if (pkeygen != NULL)
268	0	*pkeygen = meth->keygen;
269	0	}
270
271		void EC_KEY_METHOD_get_compute_key(const EC_KEY_METHOD *meth,
272		int (pck)(unsigned char pout,
273		size_t *poutlen,
274		const EC_POINT *pub_key,
275		const EC_KEY *ecdh))
276	0	{
277	0	if (pck != NULL)
278	0	*pck = meth->compute_key;
279	0	}
280
281		void EC_KEY_METHOD_get_sign(const EC_KEY_METHOD *meth,
282		int (*psign)(int type, const unsigned char dgst,
283		int dlen, unsigned char *sig,
284		unsigned int *siglen,
285		const BIGNUM kinv, const BIGNUM r,
286		EC_KEY *eckey),
287		int (*psign_setup)(EC_KEY eckey, BN_CTX *ctx_in,
288		BIGNUM kinvp, BIGNUM rp),
289		ECDSA_SIG (psign_sig)(const unsigned char dgst,
290		int dgst_len,
291		const BIGNUM *in_kinv,
292		const BIGNUM *in_r,
293		EC_KEY *eckey))
294	0	{
295	0	if (psign != NULL)
296	0	*psign = meth->sign;
297	0	if (psign_setup != NULL)
298	0	*psign_setup = meth->sign_setup;
299	0	if (psign_sig != NULL)
300	0	*psign_sig = meth->sign_sig;
301	0	}
302
303		void EC_KEY_METHOD_get_verify(const EC_KEY_METHOD *meth,
304		int (**pverify)(int type, const unsigned
305		char *dgst, int dgst_len,
306		const unsigned char *sigbuf,
307		int sig_len, EC_KEY *eckey),
308		int (*pverify_sig)(const unsigned char dgst,
309		int dgst_len,
310		const ECDSA_SIG *sig,
311		EC_KEY *eckey))
312	0	{
313	0	if (pverify != NULL)
314	0	*pverify = meth->verify;
315	0	if (pverify_sig != NULL)
316	0	*pverify_sig = meth->verify_sig;
317	0	}