1 /* $OpenBSD: hm_pmeth.c,v 1.13 2022/03/30 07:17:48 tb Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2007.
4 */
5 /* ====================================================================
6 * Copyright (c) 2007 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 <stdio.h>
60 #include <string.h>
61
62 #include <openssl/evp.h>
63 #include <openssl/hmac.h>
64 #include <openssl/x509.h>
65 #include <openssl/x509v3.h>
66
67 #include "evp_locl.h"
68 #include "hmac_local.h"
69
70 /* HMAC pkey context structure */
71
72 typedef struct {
73 const EVP_MD *md; /* MD for HMAC use */
74 ASN1_OCTET_STRING ktmp; /* Temp storage for key */
75 HMAC_CTX ctx;
76 } HMAC_PKEY_CTX;
77
78 static int
pkey_hmac_init(EVP_PKEY_CTX * ctx)79 pkey_hmac_init(EVP_PKEY_CTX *ctx)
80 {
81 HMAC_PKEY_CTX *hctx;
82
83 if ((hctx = calloc(1, sizeof(HMAC_PKEY_CTX))) == NULL)
84 return 0;
85
86 hctx->ktmp.type = V_ASN1_OCTET_STRING;
87 HMAC_CTX_init(&hctx->ctx);
88
89 ctx->data = hctx;
90 ctx->keygen_info_count = 0;
91
92 return 1;
93 }
94
95 static int
pkey_hmac_copy(EVP_PKEY_CTX * dst,EVP_PKEY_CTX * src)96 pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
97 {
98 HMAC_PKEY_CTX *sctx, *dctx;
99
100 if (!pkey_hmac_init(dst))
101 return 0;
102 sctx = src->data;
103 dctx = dst->data;
104 dctx->md = sctx->md;
105 HMAC_CTX_init(&dctx->ctx);
106 if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx))
107 return 0;
108 if (sctx->ktmp.data) {
109 if (!ASN1_OCTET_STRING_set(&dctx->ktmp, sctx->ktmp.data,
110 sctx->ktmp.length))
111 return 0;
112 }
113 return 1;
114 }
115
116 static void
pkey_hmac_cleanup(EVP_PKEY_CTX * ctx)117 pkey_hmac_cleanup(EVP_PKEY_CTX *ctx)
118 {
119 HMAC_PKEY_CTX *hctx;
120
121 if ((hctx = ctx->data) == NULL)
122 return;
123
124 HMAC_CTX_cleanup(&hctx->ctx);
125 freezero(hctx->ktmp.data, hctx->ktmp.length);
126 free(hctx);
127 }
128
129 static int
pkey_hmac_keygen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)130 pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
131 {
132 ASN1_OCTET_STRING *hkey = NULL;
133 HMAC_PKEY_CTX *hctx = ctx->data;
134
135 if (!hctx->ktmp.data)
136 return 0;
137 hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
138 if (!hkey)
139 return 0;
140 EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
141
142 return 1;
143 }
144
145 static int
int_update(EVP_MD_CTX * ctx,const void * data,size_t count)146 int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
147 {
148 HMAC_PKEY_CTX *hctx = ctx->pctx->data;
149
150 if (!HMAC_Update(&hctx->ctx, data, count))
151 return 0;
152 return 1;
153 }
154
155 static int
hmac_signctx_init(EVP_PKEY_CTX * ctx,EVP_MD_CTX * mctx)156 hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
157 {
158 HMAC_PKEY_CTX *hctx = ctx->data;
159
160 HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT);
161 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
162 mctx->update = int_update;
163 return 1;
164 }
165
166 static int
hmac_signctx(EVP_PKEY_CTX * ctx,unsigned char * sig,size_t * siglen,EVP_MD_CTX * mctx)167 hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
168 EVP_MD_CTX *mctx)
169 {
170 unsigned int hlen;
171 HMAC_PKEY_CTX *hctx = ctx->data;
172 int l = EVP_MD_CTX_size(mctx);
173
174 if (l < 0)
175 return 0;
176 *siglen = l;
177 if (!sig)
178 return 1;
179
180 if (!HMAC_Final(&hctx->ctx, sig, &hlen))
181 return 0;
182 *siglen = (size_t)hlen;
183 return 1;
184 }
185
186 static int
pkey_hmac_ctrl(EVP_PKEY_CTX * ctx,int type,int p1,void * p2)187 pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
188 {
189 HMAC_PKEY_CTX *hctx = ctx->data;
190 ASN1_OCTET_STRING *key;
191
192 switch (type) {
193 case EVP_PKEY_CTRL_SET_MAC_KEY:
194 if ((!p2 && p1 > 0) || (p1 < -1))
195 return 0;
196 if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
197 return 0;
198 break;
199
200 case EVP_PKEY_CTRL_MD:
201 hctx->md = p2;
202 break;
203
204 case EVP_PKEY_CTRL_DIGESTINIT:
205 key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
206 if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md,
207 ctx->engine))
208 return 0;
209 break;
210
211 default:
212 return -2;
213 }
214 return 1;
215 }
216
217 static int
pkey_hmac_ctrl_str(EVP_PKEY_CTX * ctx,const char * type,const char * value)218 pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
219 {
220 if (!value)
221 return 0;
222 if (!strcmp(type, "key")) {
223 void *p = (void *)value;
224 return pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p);
225 }
226 if (!strcmp(type, "hexkey")) {
227 unsigned char *key;
228 int r;
229 long keylen;
230 key = string_to_hex(value, &keylen);
231 if (!key)
232 return 0;
233 r = pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
234 free(key);
235 return r;
236 }
237 return -2;
238 }
239
240 const EVP_PKEY_METHOD hmac_pkey_meth = {
241 .pkey_id = EVP_PKEY_HMAC,
242
243 .init = pkey_hmac_init,
244 .copy = pkey_hmac_copy,
245 .cleanup = pkey_hmac_cleanup,
246
247 .keygen = pkey_hmac_keygen,
248
249 .signctx_init = hmac_signctx_init,
250 .signctx = hmac_signctx,
251
252 .ctrl = pkey_hmac_ctrl,
253 .ctrl_str = pkey_hmac_ctrl_str
254 };
255