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
63 static 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
72 static 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
81 static void pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
82 {
83 CMAC_CTX_free(ctx->data);
84 }
85
86 static 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
102 static 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
109 static 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
116 static 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
122 static 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
155 static 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
191 const 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 };