hm_pmeth.c revision 325335 
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
69typedef 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
75static 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
94static 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
116static 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
129static 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
143static 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
151static 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
160static 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
179static 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
210static 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
234const 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