1 /* $OpenBSD: m_sigver.c,v 1.9 2021/05/09 14:25:40 tb Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2006.
4 */
5 /* ====================================================================
6 * Copyright (c) 2006,2007 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
61 #include <openssl/err.h>
62 #include <openssl/evp.h>
63 #include <openssl/objects.h>
64 #include <openssl/x509.h>
65
66 #include "evp_locl.h"
67
68 static int
do_sigver_init(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey,int ver)69 do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
70 ENGINE *e, EVP_PKEY *pkey, int ver)
71 {
72 if (ctx->pctx == NULL)
73 ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
74 if (ctx->pctx == NULL)
75 return 0;
76
77 if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
78 if (type == NULL) {
79 int def_nid;
80 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
81 type = EVP_get_digestbynid(def_nid);
82 }
83
84 if (type == NULL) {
85 EVPerror(EVP_R_NO_DEFAULT_DIGEST);
86 return 0;
87 }
88 }
89
90 if (ver) {
91 if (ctx->pctx->pmeth->verifyctx_init) {
92 if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx,
93 ctx) <=0)
94 return 0;
95 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
96 } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
97 return 0;
98 } else {
99 if (ctx->pctx->pmeth->signctx_init) {
100 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
101 return 0;
102 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
103 } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
104 return 0;
105 }
106 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
107 return 0;
108 if (pctx)
109 *pctx = ctx->pctx;
110 if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
111 return 1;
112 if (!EVP_DigestInit_ex(ctx, type, e))
113 return 0;
114 return 1;
115 }
116
117 int
EVP_DigestSignInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)118 EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
119 ENGINE *e, EVP_PKEY *pkey)
120 {
121 return do_sigver_init(ctx, pctx, type, e, pkey, 0);
122 }
123
124 int
EVP_DigestVerifyInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)125 EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
126 ENGINE *e, EVP_PKEY *pkey)
127 {
128 return do_sigver_init(ctx, pctx, type, e, pkey, 1);
129 }
130
131 int
EVP_DigestSignFinal(EVP_MD_CTX * ctx,unsigned char * sigret,size_t * siglen)132 EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen)
133 {
134 EVP_PKEY_CTX *pctx = ctx->pctx;
135 int sctx;
136 int r = 0;
137
138 if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
139 EVP_PKEY_CTX *dctx;
140
141 if (sigret == NULL)
142 return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
143
144 /* XXX - support EVP_MD_CTX_FLAG_FINALISE? */
145 if ((dctx = EVP_PKEY_CTX_dup(ctx->pctx)) == NULL)
146 return 0;
147 r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
148 EVP_PKEY_CTX_free(dctx);
149
150 return r;
151 }
152
153 if (ctx->pctx->pmeth->signctx)
154 sctx = 1;
155 else
156 sctx = 0;
157 if (sigret) {
158 EVP_MD_CTX tmp_ctx;
159 unsigned char md[EVP_MAX_MD_SIZE];
160 unsigned int mdlen = 0;
161 EVP_MD_CTX_init(&tmp_ctx);
162 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
163 return 0;
164 if (sctx)
165 r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx,
166 sigret, siglen, &tmp_ctx);
167 else
168 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
169 EVP_MD_CTX_cleanup(&tmp_ctx);
170 if (sctx || !r)
171 return r;
172 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
173 return 0;
174 } else {
175 if (sctx) {
176 if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret,
177 siglen, ctx) <= 0)
178 return 0;
179 } else {
180 int s = EVP_MD_size(ctx->digest);
181 if (s < 0 || EVP_PKEY_sign(ctx->pctx, sigret, siglen,
182 NULL, s) <= 0)
183 return 0;
184 }
185 }
186 return 1;
187 }
188
189 int
EVP_DigestSign(EVP_MD_CTX * ctx,unsigned char * sigret,size_t * siglen,const unsigned char * tbs,size_t tbslen)190 EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
191 const unsigned char *tbs, size_t tbslen)
192 {
193 if (sigret != NULL) {
194 if (EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
195 return 0;
196 }
197
198 return EVP_DigestSignFinal(ctx, sigret, siglen);
199 }
200
201 int
EVP_DigestVerifyFinal(EVP_MD_CTX * ctx,const unsigned char * sig,size_t siglen)202 EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig, size_t siglen)
203 {
204 EVP_MD_CTX tmp_ctx;
205 unsigned char md[EVP_MAX_MD_SIZE];
206 int r;
207 unsigned int mdlen = 0;
208 int vctx;
209
210 if (ctx->pctx->pmeth->verifyctx)
211 vctx = 1;
212 else
213 vctx = 0;
214 EVP_MD_CTX_init(&tmp_ctx);
215 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
216 return -1;
217 if (vctx) {
218 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, sig,
219 siglen, &tmp_ctx);
220 } else
221 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
222 EVP_MD_CTX_cleanup(&tmp_ctx);
223 if (vctx || !r)
224 return r;
225 return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
226 }
227
228 int
EVP_DigestVerify(EVP_MD_CTX * ctx,const unsigned char * sigret,size_t siglen,const unsigned char * tbs,size_t tbslen)229 EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret, size_t siglen,
230 const unsigned char *tbs, size_t tbslen)
231 {
232 if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
233 return -1;
234
235 return EVP_DigestVerifyFinal(ctx, sigret, siglen);
236 }
237