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 if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx))
103 goto err;
104 if (sctx->ktmp.data != NULL) {
105 if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
106 sctx->ktmp.data, sctx->ktmp.length))
107 goto err;
108 }
109 return 1;
110 err:
111 HMAC_CTX_cleanup(&dctx->ctx);
112 OPENSSL_free(dctx);
113 return 0;
114 }
115
pkey_hmac_cleanup(EVP_PKEY_CTX * ctx)116 static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx)
117 {
118 HMAC_PKEY_CTX *hctx = ctx->data;
119 HMAC_CTX_cleanup(&hctx->ctx);
120 if (hctx->ktmp.data) {
121 if (hctx->ktmp.length)
122 OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length);
123 OPENSSL_free(hctx->ktmp.data);
124 hctx->ktmp.data = NULL;
125 }
126 OPENSSL_free(hctx);
127 }
128
pkey_hmac_keygen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)129 static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
130 {
131 ASN1_OCTET_STRING *hkey = NULL;
132 HMAC_PKEY_CTX *hctx = ctx->data;
133 if (!hctx->ktmp.data)
134 return 0;
135 hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
136 if (!hkey)
137 return 0;
138 EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
139
140 return 1;
141 }
142
int_update(EVP_MD_CTX * ctx,const void * data,size_t count)143 static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
144 {
145 HMAC_PKEY_CTX *hctx = ctx->pctx->data;
146 if (!HMAC_Update(&hctx->ctx, data, count))
147 return 0;
148 return 1;
149 }
150
hmac_signctx_init(EVP_PKEY_CTX * ctx,EVP_MD_CTX * mctx)151 static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
152 {
153 HMAC_PKEY_CTX *hctx = ctx->data;
154 HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT);
155 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
156 mctx->update = int_update;
157 return 1;
158 }
159
hmac_signctx(EVP_PKEY_CTX * ctx,unsigned char * sig,size_t * siglen,EVP_MD_CTX * mctx)160 static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
161 EVP_MD_CTX *mctx)
162 {
163 unsigned int hlen;
164 HMAC_PKEY_CTX *hctx = ctx->data;
165 int l = EVP_MD_CTX_size(mctx);
166
167 if (l < 0)
168 return 0;
169 *siglen = l;
170 if (!sig)
171 return 1;
172
173 if (!HMAC_Final(&hctx->ctx, sig, &hlen))
174 return 0;
175 *siglen = (size_t)hlen;
176 return 1;
177 }
178
pkey_hmac_ctrl(EVP_PKEY_CTX * ctx,int type,int p1,void * p2)179 static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
180 {
181 HMAC_PKEY_CTX *hctx = ctx->data;
182 ASN1_OCTET_STRING *key;
183 switch (type) {
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
pkey_hmac_ctrl_str(EVP_PKEY_CTX * ctx,const char * type,const char * value)210 static int pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
211 const char *type, const char *value)
212 {
213 if (!value) {
214 return 0;
215 }
216 if (!strcmp(type, "key")) {
217 void *p = (void *)value;
218 return pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p);
219 }
220 if (!strcmp(type, "hexkey")) {
221 unsigned char *key;
222 int r;
223 long keylen;
224 key = string_to_hex(value, &keylen);
225 if (!key)
226 return 0;
227 r = pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
228 OPENSSL_free(key);
229 return r;
230 }
231 return -2;
232 }
233
234 const EVP_PKEY_METHOD hmac_pkey_meth = {
235 EVP_PKEY_HMAC,
236 0,
237 pkey_hmac_init,
238 pkey_hmac_copy,
239 pkey_hmac_cleanup,
240
241 0, 0,
242
243 0,
244 pkey_hmac_keygen,
245
246 0, 0,
247
248 0, 0,
249
250 0, 0,
251
252 hmac_signctx_init,
253 hmac_signctx,
254
255 0, 0,
256
257 0, 0,
258
259 0, 0,
260
261 0, 0,
262
263 pkey_hmac_ctrl,
264 pkey_hmac_ctrl_str
265 };
266