1 /* m_sigver.c */
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 #include "cryptlib.h"
61 #include <openssl/evp.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64 #include "evp_locl.h"
65
66 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
67 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
68 int ver)
69 {
70 if (ctx->pctx == NULL)
71 ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
72 if (ctx->pctx == NULL)
73 return 0;
74
75 if (type == NULL)
76 {
77 int def_nid;
78 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
79 type = EVP_get_digestbynid(def_nid);
80 }
81
82 if (type == NULL)
83 {
84 EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
85 return 0;
86 }
87
88 if (ver)
89 {
90 if (ctx->pctx->pmeth->verifyctx_init)
91 {
92 if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <=0)
93 return 0;
94 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
95 }
96 else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
97 return 0;
98 }
99 else
100 {
101 if (ctx->pctx->pmeth->signctx_init)
102 {
103 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
104 return 0;
105 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
106 }
107 else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
108 return 0;
109 }
110 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
111 return 0;
112 if (pctx)
113 *pctx = ctx->pctx;
114 if (!EVP_DigestInit_ex(ctx, type, e))
115 return 0;
116 return 1;
117 }
118
119 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
120 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
121 {
122 return do_sigver_init(ctx, pctx, type, e, pkey, 0);
123 }
124
125 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
126 const EVP_MD *type, 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 {
133 int sctx, r = 0;
134 if (ctx->pctx->pmeth->signctx)
135 sctx = 1;
136 else
137 sctx = 0;
138 if (sigret)
139 {
140 EVP_MD_CTX tmp_ctx;
141 unsigned char md[EVP_MAX_MD_SIZE];
142 unsigned int mdlen;
143 EVP_MD_CTX_init(&tmp_ctx);
144 if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx))
145 return 0;
146 if (sctx)
147 r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx,
148 sigret, siglen, &tmp_ctx);
149 else
150 r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen);
151 EVP_MD_CTX_cleanup(&tmp_ctx);
152 if (sctx || !r)
153 return r;
154 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
155 return 0;
156 }
157 else
158 {
159 if (sctx)
160 {
161 if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx) <= 0)
162 return 0;
163 }
164 else
165 {
166 int s = EVP_MD_size(ctx->digest);
167 if (s < 0 || EVP_PKEY_sign(ctx->pctx, sigret, siglen, NULL, s) <= 0)
168 return 0;
169 }
170 }
171 return 1;
172 }
173
174 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, unsigned char *sig, size_t siglen)
175 {
176 EVP_MD_CTX tmp_ctx;
177 unsigned char md[EVP_MAX_MD_SIZE];
178 int r;
179 unsigned int mdlen;
180 int vctx;
181
182 if (ctx->pctx->pmeth->verifyctx)
183 vctx = 1;
184 else
185 vctx = 0;
186 EVP_MD_CTX_init(&tmp_ctx);
187 if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx))
188 return -1;
189 if (vctx)
190 {
191 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx,
192 sig, siglen, &tmp_ctx);
193 }
194 else
195 r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen);
196 EVP_MD_CTX_cleanup(&tmp_ctx);
197 if (vctx || !r)
198 return r;
199 return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
200 }