1 /*
2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 * 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 "cryptlib.h"
61 #include <openssl/x509.h>
62 #include <openssl/x509v3.h>
63 #include <openssl/evp.h>
64 #include <openssl/hmac.h>
65 #include "evp_locl.h"
66
67 /* HMAC pkey context structure */
68
69 typedef struct {
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
pkey_hmac_init(EVP_PKEY_CTX * ctx)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
pkey_hmac_copy(EVP_PKEY_CTX * dst,EVP_PKEY_CTX * src)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 if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
107 sctx->ktmp.data, sctx->ktmp.length))
108 return 0;
109 }
110 return 1;
111 }
112
pkey_hmac_cleanup(EVP_PKEY_CTX * ctx)113 static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx)
114 {
115 HMAC_PKEY_CTX *hctx = ctx->data;
116 HMAC_CTX_cleanup(&hctx->ctx);
117 if (hctx->ktmp.data) {
118 if (hctx->ktmp.length)
119 OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length);
120 OPENSSL_free(hctx->ktmp.data);
121 hctx->ktmp.data = NULL;
122 }
123 OPENSSL_free(hctx);
124 }
125
pkey_hmac_keygen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)126 static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
127 {
128 ASN1_OCTET_STRING *hkey = NULL;
129 HMAC_PKEY_CTX *hctx = ctx->data;
130 if (!hctx->ktmp.data)
131 return 0;
132 hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
133 if (!hkey)
134 return 0;
135 EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
136
137 return 1;
138 }
139
int_update(EVP_MD_CTX * ctx,const void * data,size_t count)140 static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
141 {
142 HMAC_PKEY_CTX *hctx = ctx->pctx->data;
143 if (!HMAC_Update(&hctx->ctx, data, count))
144 return 0;
145 return 1;
146 }
147
hmac_signctx_init(EVP_PKEY_CTX * ctx,EVP_MD_CTX * mctx)148 static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
149 {
150 HMAC_PKEY_CTX *hctx = ctx->data;
151 HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT);
152 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
153 mctx->update = int_update;
154 return 1;
155 }
156
hmac_signctx(EVP_PKEY_CTX * ctx,unsigned char * sig,size_t * siglen,EVP_MD_CTX * mctx)157 static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
158 EVP_MD_CTX *mctx)
159 {
160 unsigned int hlen;
161 HMAC_PKEY_CTX *hctx = ctx->data;
162 int l = EVP_MD_CTX_size(mctx);
163
164 if (l < 0)
165 return 0;
166 *siglen = l;
167 if (!sig)
168 return 1;
169
170 if (!HMAC_Final(&hctx->ctx, sig, &hlen))
171 return 0;
172 *siglen = (size_t)hlen;
173 return 1;
174 }
175
pkey_hmac_ctrl(EVP_PKEY_CTX * ctx,int type,int p1,void * p2)176 static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
177 {
178 HMAC_PKEY_CTX *hctx = ctx->data;
179 ASN1_OCTET_STRING *key;
180 switch (type) {
181
182 case EVP_PKEY_CTRL_SET_MAC_KEY:
183 if ((!p2 && p1 > 0) || (p1 < -1))
184 return 0;
185 if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
186 return 0;
187 break;
188
189 case EVP_PKEY_CTRL_MD:
190 hctx->md = p2;
191 break;
192
193 case EVP_PKEY_CTRL_DIGESTINIT:
194 key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
195 if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md,
196 ctx->engine))
197 return 0;
198 break;
199
200 default:
201 return -2;
202
203 }
204 return 1;
205 }
206
pkey_hmac_ctrl_str(EVP_PKEY_CTX * ctx,const char * type,const char * value)207 static int pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
208 const char *type, const char *value)
209 {
210 if (!value) {
211 return 0;
212 }
213 if (!strcmp(type, "key")) {
214 void *p = (void *)value;
215 return pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p);
216 }
217 if (!strcmp(type, "hexkey")) {
218 unsigned char *key;
219 int r;
220 long keylen;
221 key = string_to_hex(value, &keylen);
222 if (!key)
223 return 0;
224 r = pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
225 OPENSSL_free(key);
226 return r;
227 }
228 return -2;
229 }
230
231 const EVP_PKEY_METHOD hmac_pkey_meth = {
232 EVP_PKEY_HMAC,
233 0,
234 pkey_hmac_init,
235 pkey_hmac_copy,
236 pkey_hmac_cleanup,
237
238 0, 0,
239
240 0,
241 pkey_hmac_keygen,
242
243 0, 0,
244
245 0, 0,
246
247 0, 0,
248
249 hmac_signctx_init,
250 hmac_signctx,
251
252 0, 0,
253
254 0, 0,
255
256 0, 0,
257
258 0, 0,
259
260 pkey_hmac_ctrl,
261 pkey_hmac_ctrl_str
262 };
263