1/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2 * project 2010.
3 */
4/* ====================================================================
5 * Copyright (c) 2010 The OpenSSL Project.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in
16 *    the documentation and/or other materials provided with the
17 *    distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 *    software must display the following acknowledgment:
21 *    "This product includes software developed by the OpenSSL Project
22 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 *    endorse or promote products derived from this software without
26 *    prior written permission. For written permission, please contact
27 *    licensing@OpenSSL.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 *    nor may "OpenSSL" appear in their names without prior written
31 *    permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 *    acknowledgment:
35 *    "This product includes software developed by the OpenSSL Project
36 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 */
52
53#include <stdio.h>
54#include "cryptlib.h"
55#include <openssl/x509.h>
56#include <openssl/x509v3.h>
57#include <openssl/evp.h>
58#include <openssl/cmac.h>
59#include "evp_locl.h"
60
61/* The context structure and "key" is simply a CMAC_CTX */
62
63static int pkey_cmac_init(EVP_PKEY_CTX *ctx)
64	{
65	ctx->data = CMAC_CTX_new();
66	if (!ctx->data)
67		return 0;
68	ctx->keygen_info_count = 0;
69	return 1;
70	}
71
72static int pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
73	{
74	if (!pkey_cmac_init(dst))
75		return 0;
76	if (!CMAC_CTX_copy(dst->data, src->data))
77		return 0;
78	return 1;
79	}
80
81static void pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
82	{
83	CMAC_CTX_free(ctx->data);
84	}
85
86static int pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
87	{
88	CMAC_CTX *cmkey = CMAC_CTX_new();
89	CMAC_CTX *cmctx = ctx->data;
90	if (!cmkey)
91		return 0;
92	if (!CMAC_CTX_copy(cmkey, cmctx))
93		{
94		CMAC_CTX_free(cmkey);
95		return 0;
96		}
97	EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);
98
99	return 1;
100	}
101
102static int int_update(EVP_MD_CTX *ctx,const void *data,size_t count)
103	{
104	if (!CMAC_Update(ctx->pctx->data, data, count))
105		return 0;
106	return 1;
107	}
108
109static int cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
110	{
111	EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
112	mctx->update = int_update;
113	return 1;
114	}
115
116static int cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
117					EVP_MD_CTX *mctx)
118	{
119	return CMAC_Final(ctx->data, sig, siglen);
120	}
121
122static int pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
123	{
124	CMAC_CTX *cmctx = ctx->data;
125	switch (type)
126		{
127
128		case EVP_PKEY_CTRL_SET_MAC_KEY:
129		if (!p2 || p1 < 0)
130			return 0;
131		if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
132			return 0;
133		break;
134
135		case EVP_PKEY_CTRL_CIPHER:
136		if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
137			return 0;
138		break;
139
140		case EVP_PKEY_CTRL_MD:
141		if (ctx->pkey && !CMAC_CTX_copy(ctx->data,
142					(CMAC_CTX *)ctx->pkey->pkey.ptr))
143			return 0;
144		if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
145			return 0;
146		break;
147
148		default:
149		return -2;
150
151		}
152	return 1;
153	}
154
155static int pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx,
156			const char *type, const char *value)
157	{
158	if (!value)
159		{
160		return 0;
161		}
162	if (!strcmp(type, "key"))
163		{
164		void *p = (void *)value;
165		return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY,
166								strlen(p), p);
167		}
168	if (!strcmp(type, "cipher"))
169		{
170		const EVP_CIPHER *c;
171		c = EVP_get_cipherbyname(value);
172		if (!c)
173			return 0;
174		return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
175		}
176	if (!strcmp(type, "hexkey"))
177		{
178		unsigned char *key;
179		int r;
180		long keylen;
181		key = string_to_hex(value, &keylen);
182		if (!key)
183			return 0;
184		r = pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
185		OPENSSL_free(key);
186		return r;
187		}
188	return -2;
189	}
190
191const EVP_PKEY_METHOD cmac_pkey_meth =
192	{
193	EVP_PKEY_CMAC,
194	EVP_PKEY_FLAG_SIGCTX_CUSTOM,
195	pkey_cmac_init,
196	pkey_cmac_copy,
197	pkey_cmac_cleanup,
198
199	0, 0,
200
201	0,
202	pkey_cmac_keygen,
203
204	0, 0,
205
206	0, 0,
207
208	0,0,
209
210	cmac_signctx_init,
211	cmac_signctx,
212
213	0,0,
214
215	0,0,
216
217	0,0,
218
219	0,0,
220
221	pkey_cmac_ctrl,
222	pkey_cmac_ctrl_str
223
224	};
225