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d3819813 MTL |
1 | /* m_sigver.c */ |
2 | /* | |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project | |
4 | * 2006. | |
5 | */ | |
6 | /* ==================================================================== | |
7 | * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * | |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in | |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
20 | * | |
21 | * 3. All advertising materials mentioning features or use of this | |
22 | * software must display the following acknowledgment: | |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
25 | * | |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
27 | * endorse or promote products derived from this software without | |
28 | * prior written permission. For written permission, please contact | |
29 | * licensing@OpenSSL.org. | |
30 | * | |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
32 | * nor may "OpenSSL" appear in their names without prior written | |
33 | * permission of the OpenSSL Project. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | * | |
54 | * This product includes cryptographic software written by Eric Young | |
55 | * (eay@cryptsoft.com). This product includes software written by Tim | |
56 | * Hudson (tjh@cryptsoft.com). | |
57 | * | |
58 | */ | |
59 | ||
60 | #include <stdio.h> | |
61 | #include "cryptlib.h" | |
62 | #include <openssl/evp.h> | |
63 | #include <openssl/objects.h> | |
64 | #include <openssl/x509.h> | |
65 | #include "evp_locl.h" | |
66 | ||
67 | static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, | |
68 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, | |
69 | int ver) | |
70 | { | |
71 | if (ctx->pctx == NULL) | |
72 | ctx->pctx = EVP_PKEY_CTX_new(pkey, e); | |
73 | if (ctx->pctx == NULL) | |
74 | return 0; | |
75 | ||
76 | if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) { | |
77 | ||
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 | EVPerr(EVP_F_DO_SIGVER_INIT, 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, ctx) <= 0) | |
93 | return 0; | |
94 | ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; | |
95 | } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) | |
96 | return 0; | |
97 | } else { | |
98 | if (ctx->pctx->pmeth->signctx_init) { | |
99 | if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) | |
100 | return 0; | |
101 | ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; | |
102 | } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) | |
103 | return 0; | |
104 | } | |
105 | if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) | |
106 | return 0; | |
107 | if (pctx) | |
108 | *pctx = ctx->pctx; | |
109 | if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) | |
110 | return 1; | |
111 | if (!EVP_DigestInit_ex(ctx, type, e)) | |
112 | return 0; | |
113 | return 1; | |
114 | } | |
115 | ||
116 | int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, | |
117 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) | |
118 | { | |
119 | return do_sigver_init(ctx, pctx, type, e, pkey, 0); | |
120 | } | |
121 | ||
122 | int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, | |
123 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) | |
124 | { | |
125 | return do_sigver_init(ctx, pctx, type, e, pkey, 1); | |
126 | } | |
127 | ||
128 | int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, | |
129 | size_t *siglen) | |
130 | { | |
131 | int sctx, r = 0; | |
132 | EVP_PKEY_CTX *pctx = ctx->pctx; | |
133 | if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) { | |
134 | EVP_PKEY_CTX *dctx; | |
135 | if (!sigret) | |
136 | return pctx->pmeth->signctx(pctx, sigret, siglen, ctx); | |
137 | dctx = EVP_PKEY_CTX_dup(ctx->pctx); | |
138 | if (!dctx) | |
139 | return 0; | |
140 | r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx); | |
141 | EVP_PKEY_CTX_free(dctx); | |
142 | return r; | |
143 | } | |
144 | if (pctx->pmeth->signctx) | |
145 | sctx = 1; | |
146 | else | |
147 | sctx = 0; | |
148 | if (sigret) { | |
149 | EVP_MD_CTX tmp_ctx; | |
150 | unsigned char md[EVP_MAX_MD_SIZE]; | |
151 | unsigned int mdlen; | |
152 | EVP_MD_CTX_init(&tmp_ctx); | |
153 | if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) | |
154 | return 0; | |
155 | if (sctx) | |
156 | r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, | |
157 | sigret, siglen, &tmp_ctx); | |
158 | else | |
159 | r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); | |
160 | EVP_MD_CTX_cleanup(&tmp_ctx); | |
161 | if (sctx || !r) | |
162 | return r; | |
163 | if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0) | |
164 | return 0; | |
165 | } else { | |
166 | if (sctx) { | |
167 | if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0) | |
168 | return 0; | |
169 | } else { | |
170 | int s = EVP_MD_size(ctx->digest); | |
171 | if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0) | |
172 | return 0; | |
173 | } | |
174 | } | |
175 | return 1; | |
176 | } | |
177 | ||
178 | int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig, | |
179 | size_t siglen) | |
180 | { | |
181 | EVP_MD_CTX tmp_ctx; | |
182 | unsigned char md[EVP_MAX_MD_SIZE]; | |
183 | int r; | |
184 | unsigned int mdlen; | |
185 | int vctx; | |
186 | ||
187 | if (ctx->pctx->pmeth->verifyctx) | |
188 | vctx = 1; | |
189 | else | |
190 | vctx = 0; | |
191 | EVP_MD_CTX_init(&tmp_ctx); | |
192 | if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) | |
193 | return -1; | |
194 | if (vctx) { | |
195 | r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, | |
196 | sig, siglen, &tmp_ctx); | |
197 | } else | |
198 | r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); | |
199 | EVP_MD_CTX_cleanup(&tmp_ctx); | |
200 | if (vctx || !r) | |
201 | return r; | |
202 | return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen); | |
203 | } |