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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, NU
LL, 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 } | |
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