cm_pmeth.c revision 296341 
1/*
2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 * 2010.
4 */
5/* ====================================================================
6 * Copyright (c) 2010 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
54#include <stdio.h>
55#include "cryptlib.h"
56#include <openssl/x509.h>
57#include <openssl/x509v3.h>
58#include <openssl/evp.h>
59#include <openssl/cmac.h>
60#include "evp_locl.h"
61
62/* The context structure and "key" is simply a CMAC_CTX */
63
64static int pkey_cmac_init(EVP_PKEY_CTX *ctx)
65{
66    ctx->data = CMAC_CTX_new();
67    if (!ctx->data)
68        return 0;
69    ctx->keygen_info_count = 0;
70    return 1;
71}
72
73static int pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
74{
75    if (!pkey_cmac_init(dst))
76        return 0;
77    if (!CMAC_CTX_copy(dst->data, src->data))
78        return 0;
79    return 1;
80}
81
82static void pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
83{
84    CMAC_CTX_free(ctx->data);
85}
86
87static int pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
88{
89    CMAC_CTX *cmkey = CMAC_CTX_new();
90    CMAC_CTX *cmctx = ctx->data;
91    if (!cmkey)
92        return 0;
93    if (!CMAC_CTX_copy(cmkey, cmctx)) {
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    case EVP_PKEY_CTRL_SET_MAC_KEY:
128        if (!p2 || p1 < 0)
129            return 0;
130        if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
131            return 0;
132        break;
133
134    case EVP_PKEY_CTRL_CIPHER:
135        if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
136            return 0;
137        break;
138
139    case EVP_PKEY_CTRL_MD:
140        if (ctx->pkey && !CMAC_CTX_copy(ctx->data,
141                                        (CMAC_CTX *)ctx->pkey->pkey.ptr))
142            return 0;
143        if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
144            return 0;
145        break;
146
147    default:
148        return -2;
149
150    }
151    return 1;
152}
153
154static int pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx,
155                              const char *type, const char *value)
156{
157    if (!value) {
158        return 0;
159    }
160    if (!strcmp(type, "key")) {
161        void *p = (void *)value;
162        return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, strlen(p), p);
163    }
164    if (!strcmp(type, "cipher")) {
165        const EVP_CIPHER *c;
166        c = EVP_get_cipherbyname(value);
167        if (!c)
168            return 0;
169        return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
170    }
171    if (!strcmp(type, "hexkey")) {
172        unsigned char *key;
173        int r;
174        long keylen;
175        key = string_to_hex(value, &keylen);
176        if (!key)
177            return 0;
178        r = pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
179        OPENSSL_free(key);
180        return r;
181    }
182    return -2;
183}
184
185const EVP_PKEY_METHOD cmac_pkey_meth = {
186    EVP_PKEY_CMAC,
187    EVP_PKEY_FLAG_SIGCTX_CUSTOM,
188    pkey_cmac_init,
189    pkey_cmac_copy,
190    pkey_cmac_cleanup,
191
192    0, 0,
193
194    0,
195    pkey_cmac_keygen,
196
197    0, 0,
198
199    0, 0,
200
201    0, 0,
202
203    cmac_signctx_init,
204    cmac_signctx,
205
206    0, 0,
207
208    0, 0,
209
210    0, 0,
211
212    0, 0,
213
214    pkey_cmac_ctrl,
215    pkey_cmac_ctrl_str
216};
217