1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2 * project 2007.
3 */
4 /* ====================================================================
5 * Copyright (c) 2007 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 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
55 *
56 */
57
58 #include <stdio.h>
59 #include "cryptlib.h"
60 #include <openssl/x509.h>
61 #include <openssl/x509v3.h>
62 #include <openssl/evp.h>
63 #include <openssl/hmac.h>
64 #include "evp_locl.h"
65
66 /* HMAC pkey context structure */
67
68 typedef struct
69 {
70 const EVP_MD *md; /* MD for HMAC use */
71 ASN1_OCTET_STRING ktmp; /* Temp storage for key */
72 HMAC_CTX ctx;
73 } HMAC_PKEY_CTX;
74
75 static int pkey_hmac_init(EVP_PKEY_CTX *ctx)
76 {
77 HMAC_PKEY_CTX *hctx;
78 hctx = OPENSSL_malloc(sizeof(HMAC_PKEY_CTX));
79 if (!hctx)
80 return 0;
81 hctx->md = NULL;
82 hctx->ktmp.data = NULL;
83 hctx->ktmp.length = 0;
84 hctx->ktmp.flags = 0;
85 hctx->ktmp.type = V_ASN1_OCTET_STRING;
86 HMAC_CTX_init(&hctx->ctx);
87
88 ctx->data = hctx;
89 ctx->keygen_info_count = 0;
90
91 return 1;
92 }
93
94 static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
95 {
96 HMAC_PKEY_CTX *sctx, *dctx;
97 if (!pkey_hmac_init(dst))
98 return 0;
99 sctx = src->data;
100 dctx = dst->data;
101 dctx->md = sctx->md;
102 HMAC_CTX_init(&dctx->ctx);
103 if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx))
104 return 0;
105 if (sctx->ktmp.data)
106 {
107 if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
108 sctx->ktmp.data, sctx->ktmp.length))
109 return 0;
110 }
111 return 1;
112 }
113
114 static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx)
115 {
116 HMAC_PKEY_CTX *hctx = ctx->data;
117 HMAC_CTX_cleanup(&hctx->ctx);
118 if (hctx->ktmp.data)
119 {
120 if (hctx->ktmp.length)
121 OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length);
122 OPENSSL_free(hctx->ktmp.data);
123 hctx->ktmp.data = NULL;
124 }
125 OPENSSL_free(hctx);
126 }
127
128 static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
129 {
130 ASN1_OCTET_STRING *hkey = NULL;
131 HMAC_PKEY_CTX *hctx = ctx->data;
132 if (!hctx->ktmp.data)
133 return 0;
134 hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
135 if (!hkey)
136 return 0;
137 EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
138
139 return 1;
140 }
141
142 static int int_update(EVP_MD_CTX *ctx,const void *data,size_t count)
143 {
144 HMAC_PKEY_CTX *hctx = ctx->pctx->data;
145 if (!HMAC_Update(&hctx->ctx, data, count))
146 return 0;
147 return 1;
148 }
149
150 static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
151 {
152 HMAC_PKEY_CTX *hctx = ctx->data;
153 HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT);
154 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
155 mctx->update = int_update;
156 return 1;
157 }
158
159 static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
160 EVP_MD_CTX *mctx)
161 {
162 unsigned int hlen;
163 HMAC_PKEY_CTX *hctx = ctx->data;
164 int l = EVP_MD_CTX_size(mctx);
165
166 if (l < 0)
167 return 0;
168 *siglen = l;
169 if (!sig)
170 return 1;
171
172 if (!HMAC_Final(&hctx->ctx, sig, &hlen))
173 return 0;
174 *siglen = (size_t)hlen;
175 return 1;
176 }
177
178 static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
179 {
180 HMAC_PKEY_CTX *hctx = ctx->data;
181 ASN1_OCTET_STRING *key;
182 switch (type)
183 {
184
185 case EVP_PKEY_CTRL_SET_MAC_KEY:
186 if ((!p2 && p1 > 0) || (p1 < -1))
187 return 0;
188 if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
189 return 0;
190 break;
191
192 case EVP_PKEY_CTRL_MD:
193 hctx->md = p2;
194 break;
195
196 case EVP_PKEY_CTRL_DIGESTINIT:
197 key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
198 if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md,
199 ctx->engine))
200 return 0;
201 break;
202
203 default:
204 return -2;
205
206 }
207 return 1;
208 }
209
210 static int pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
211 const char *type, const char *value)
212 {
213 if (!value)
214 {
215 return 0;
216 }
217 if (!strcmp(type, "key"))
218 {
219 void *p = (void *)value;
220 return pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY,
221 -1, p);
222 }
223 if (!strcmp(type, "hexkey"))
224 {
225 unsigned char *key;
226 int r;
227 long keylen;
228 key = string_to_hex(value, &keylen);
229 if (!key)
230 return 0;
231 r = pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
232 OPENSSL_free(key);
233 return r;
234 }
235 return -2;
236 }
237
238 const EVP_PKEY_METHOD hmac_pkey_meth =
239 {
240 EVP_PKEY_HMAC,
241 0,
242 pkey_hmac_init,
243 pkey_hmac_copy,
244 pkey_hmac_cleanup,
245
246 0, 0,
247
248 0,
249 pkey_hmac_keygen,
250
251 0, 0,
252
253 0, 0,
254
255 0,0,
256
257 hmac_signctx_init,
258 hmac_signctx,
259
260 0,0,
261
262 0,0,
263
264 0,0,
265
266 0,0,
267
268 pkey_hmac_ctrl,
269 pkey_hmac_ctrl_str
270
271 };