Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/dh/dh_pmeth.c	Lines:	48	88	54.5 %
Date:	2017-11-07	Branches:	14	52	26.9 %


/* $OpenBSD: dh_pmeth.c,v 1.10 2017/01/29 17:49:22 beck Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006.
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <limits.h>
#include <stdio.h>
#include <string.h>

#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/x509.h>

#include "evp_locl.h"

/* DH pkey context structure */

typedef struct {
	/* Parameter gen parameters */
	int prime_len;
	int generator;
	int use_dsa;
	/* Keygen callback info */
	int gentmp[2];
	/* message digest */
} DH_PKEY_CTX;

static int
pkey_dh_init(EVP_PKEY_CTX *ctx)
{
	DH_PKEY_CTX *dctx;

	dctx = malloc(sizeof(DH_PKEY_CTX));
	if (!dctx)
		return 0;
	dctx->prime_len = 1024;
	dctx->generator = 2;
	dctx->use_dsa = 0;

	ctx->data = dctx;
	ctx->keygen_info = dctx->gentmp;
	ctx->keygen_info_count = 2;

	return 1;
}

static int
pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
	DH_PKEY_CTX *dctx, *sctx;

	if (!pkey_dh_init(dst))
		return 0;
       	sctx = src->data;
	dctx = dst->data;
	dctx->prime_len = sctx->prime_len;
	dctx->generator = sctx->generator;
	dctx->use_dsa = sctx->use_dsa;
	return 1;
}

static void
pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
{
	DH_PKEY_CTX *dctx = ctx->data;

	free(dctx);
}

static int
pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
	DH_PKEY_CTX *dctx = ctx->data;

	switch (type) {
	case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
		if (p1 < 256)
			return -2;
		dctx->prime_len = p1;
		return 1;

	case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
		dctx->generator = p1;
		return 1;

	case EVP_PKEY_CTRL_PEER_KEY:
		/* Default behaviour is OK */
		return 1;

	default:
		return -2;
	}
}

static int
pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
{
 	long lval;
	char *ep;
	int len;

	if (!strcmp(type, "dh_paramgen_prime_len")) {
		errno = 0;
		lval = strtol(value, &ep, 10);
		if (value[0] == '\0' || *ep != '\0')
			goto not_a_number;
		if ((errno == ERANGE &&
		    (lval == LONG_MAX || lval == LONG_MIN)) ||
		    (lval > INT_MAX || lval < INT_MIN))
			goto out_of_range;
		len = lval;
		return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
	} else if (!strcmp(type, "dh_paramgen_generator")) {
		errno = 0;
		lval = strtol(value, &ep, 10);
		if (value[0] == '\0' || *ep != '\0')
			goto not_a_number;
		if ((errno == ERANGE &&
		    (lval == LONG_MAX || lval == LONG_MIN)) ||
		    (lval > INT_MAX || lval < INT_MIN))
			goto out_of_range;
		len = lval;
		return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
	}

not_a_number:
out_of_range:
	return -2;
}

static int
pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
	DH *dh = NULL;
	DH_PKEY_CTX *dctx = ctx->data;
	BN_GENCB *pcb, cb;
	int ret;

	if (ctx->pkey_gencb) {
		pcb = &cb;
		evp_pkey_set_cb_translate(pcb, ctx);
	} else
		pcb = NULL;
	dh = DH_new();
	if (!dh)
		return 0;
	ret = DH_generate_parameters_ex(dh, dctx->prime_len, dctx->generator,
	    pcb);
	if (ret)
		EVP_PKEY_assign_DH(pkey, dh);
	else
		DH_free(dh);
	return ret;
}

static int
pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
	DH *dh = NULL;

	if (ctx->pkey == NULL) {
		DHerror(DH_R_NO_PARAMETERS_SET);
		return 0;
	}
	dh = DH_new();
	if (!dh)
		return 0;
	EVP_PKEY_assign_DH(pkey, dh);
	/* Note: if error return, pkey is freed by parent routine */
	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
		return 0;
	return DH_generate_key(pkey->pkey.dh);
}

static int
pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
{
	int ret;

	if (!ctx->pkey || !ctx->peerkey) {
		DHerror(DH_R_KEYS_NOT_SET);
		return 0;
	}
	ret = DH_compute_key(key, ctx->peerkey->pkey.dh->pub_key,
	    ctx->pkey->pkey.dh);
	if (ret < 0)
		return ret;
	*keylen = ret;
	return 1;
}

const EVP_PKEY_METHOD dh_pkey_meth = {
	.pkey_id = EVP_PKEY_DH,
	.flags = EVP_PKEY_FLAG_AUTOARGLEN,

	.init = pkey_dh_init,
	.copy = pkey_dh_copy,
	.cleanup = pkey_dh_cleanup,

	.paramgen = pkey_dh_paramgen,

	.keygen = pkey_dh_keygen,

	.derive = pkey_dh_derive,

	.ctrl = pkey_dh_ctrl,
	.ctrl_str = pkey_dh_ctrl_str
};


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: dh_pmeth.c,v 1.10 2017/01/29 17:49:22 beck Exp $ */
2			/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3			* project 2006.
4			*/
5			/* ====================================================================
6			* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			*
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			*
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in
17			* the documentation and/or other materials provided with the
18			* distribution.
19			*
20			* 3. All advertising materials mentioning features or use of this
21			* software must display the following acknowledgment:
22			* "This product includes software developed by the OpenSSL Project
23			* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24			*
25			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26			* endorse or promote products derived from this software without
27			* prior written permission. For written permission, please contact
28			* licensing@OpenSSL.org.
29			*
30			* 5. Products derived from this software may not be called "OpenSSL"
31			* nor may "OpenSSL" appear in their names without prior written
32			* permission of the OpenSSL Project.
33			*
34			* 6. Redistributions of any form whatsoever must retain the following
35			* acknowledgment:
36			* "This product includes software developed by the OpenSSL Project
37			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38			*
39			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50			* OF THE POSSIBILITY OF SUCH DAMAGE.
51			* ====================================================================
52			*
53			* This product includes cryptographic software written by Eric Young
54			* (eay@cryptsoft.com). This product includes software written by Tim
55			* Hudson (tjh@cryptsoft.com).
56			*
57			*/
58
59			#include <limits.h>
60			#include <stdio.h>
61			#include <string.h>
62
63			#include <openssl/asn1t.h>
64			#include <openssl/bn.h>
65			#include <openssl/dh.h>
66			#include <openssl/err.h>
67			#include <openssl/evp.h>
68			#include <openssl/x509.h>
69
70			#include "evp_locl.h"
71
72			/* DH pkey context structure */
73
74			typedef struct {
75			/* Parameter gen parameters */
76			int prime_len;
77			int generator;
78			int use_dsa;
79			/* Keygen callback info */
80			int gentmp[2];
81			/* message digest */
82			} DH_PKEY_CTX;
83
84			static int
85			pkey_dh_init(EVP_PKEY_CTX *ctx)
86			{
87			DH_PKEY_CTX *dctx;
88
89		8	dctx = malloc(sizeof(DH_PKEY_CTX));
90	✗✓	4	if (!dctx)
91			return 0;
92		4	dctx->prime_len = 1024;
93		4	dctx->generator = 2;
94		4	dctx->use_dsa = 0;
95
96		4	ctx->data = dctx;
97		4	ctx->keygen_info = dctx->gentmp;
98		4	ctx->keygen_info_count = 2;
99
100		4	return 1;
101		4	}
102
103			static int
104			pkey_dh_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
105			{
106			DH_PKEY_CTX dctx, sctx;
107
108			if (!pkey_dh_init(dst))
109			return 0;
110			sctx = src->data;
111			dctx = dst->data;
112			dctx->prime_len = sctx->prime_len;
113			dctx->generator = sctx->generator;
114			dctx->use_dsa = sctx->use_dsa;
115			return 1;
116			}
117
118			static void
119			pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
120			{
121		8	DH_PKEY_CTX *dctx = ctx->data;
122
123		4	free(dctx);
124		4	}
125
126			static int
127			pkey_dh_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
128			{
129		4	DH_PKEY_CTX *dctx = ctx->data;
130
131	✓✗✗✗	2	switch (type) {
132			case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
133	✗✓	2	if (p1 < 256)
134			return -2;
135		2	dctx->prime_len = p1;
136		2	return 1;
137
138			case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
139			dctx->generator = p1;
140			return 1;
141
142			case EVP_PKEY_CTRL_PEER_KEY:
143			/* Default behaviour is OK */
144			return 1;
145
146			default:
147			return -2;
148			}
149		2	}
150
151			static int
152			pkey_dh_ctrl_str(EVP_PKEY_CTX ctx, const char type, const char *value)
153			{
154			long lval;
155		4	char *ep;
156			int len;
157
158	✓✗	2	if (!strcmp(type, "dh_paramgen_prime_len")) {
159		2	errno = 0;
160		2	lval = strtol(value, &ep, 10);
161	✓✗✓✗	4	if (value[0] == '\0' \|\| *ep != '\0')
162			goto not_a_number;
163	✗✓	2	if ((errno == ERANGE &&
164			(lval == LONG_MAX \|\| lval == LONG_MIN)) \|\|
165	✓✗	2	(lval > INT_MAX \|\| lval < INT_MIN))
166			goto out_of_range;
167		2	len = lval;
168		2	return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
169			} else if (!strcmp(type, "dh_paramgen_generator")) {
170			errno = 0;
171			lval = strtol(value, &ep, 10);
172			if (value[0] == '\0' \|\| *ep != '\0')
173			goto not_a_number;
174			if ((errno == ERANGE &&
175			(lval == LONG_MAX \|\| lval == LONG_MIN)) \|\|
176			(lval > INT_MAX \|\| lval < INT_MIN))
177			goto out_of_range;
178			len = lval;
179			return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
180			}
181
182			not_a_number:
183			out_of_range:
184			return -2;
185		2	}
186
187			static int
188			pkey_dh_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
189			{
190			DH *dh = NULL;
191		4	DH_PKEY_CTX *dctx = ctx->data;
192		2	BN_GENCB *pcb, cb;
193			int ret;
194
195	✓✗	2	if (ctx->pkey_gencb) {
196			pcb = &cb;
197		2	evp_pkey_set_cb_translate(pcb, ctx);
198		2	} else
199			pcb = NULL;
200		2	dh = DH_new();
201	✗✓	2	if (!dh)
202			return 0;
203		2	ret = DH_generate_parameters_ex(dh, dctx->prime_len, dctx->generator,
204			pcb);
205	✓✗	2	if (ret)
206		2	EVP_PKEY_assign_DH(pkey, dh);
207			else
208			DH_free(dh);
209		2	return ret;
210		2	}
211
212			static int
213			pkey_dh_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
214			{
215			DH *dh = NULL;
216
217	✗✓	4	if (ctx->pkey == NULL) {
218			DHerror(DH_R_NO_PARAMETERS_SET);
219			return 0;
220			}
221		2	dh = DH_new();
222	✗✓	2	if (!dh)
223			return 0;
224		2	EVP_PKEY_assign_DH(pkey, dh);
225			/* Note: if error return, pkey is freed by parent routine */
226	✗✓	2	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
227			return 0;
228		2	return DH_generate_key(pkey->pkey.dh);
229		2	}
230
231			static int
232			pkey_dh_derive(EVP_PKEY_CTX ctx, unsigned char key, size_t *keylen)
233			{
234			int ret;
235
236			if (!ctx->pkey \|\| !ctx->peerkey) {
237			DHerror(DH_R_KEYS_NOT_SET);
238			return 0;
239			}
240			ret = DH_compute_key(key, ctx->peerkey->pkey.dh->pub_key,
241			ctx->pkey->pkey.dh);
242			if (ret < 0)
243			return ret;
244			*keylen = ret;
245			return 1;
246			}
247
248			const EVP_PKEY_METHOD dh_pkey_meth = {
249			.pkey_id = EVP_PKEY_DH,
250			.flags = EVP_PKEY_FLAG_AUTOARGLEN,
251
252			.init = pkey_dh_init,
253			.copy = pkey_dh_copy,
254			.cleanup = pkey_dh_cleanup,
255
256			.paramgen = pkey_dh_paramgen,
257
258			.keygen = pkey_dh_keygen,
259
260			.derive = pkey_dh_derive,
261
262			.ctrl = pkey_dh_ctrl,
263			.ctrl_str = pkey_dh_ctrl_str
264			};