1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2 * project 2006.
3 */
4 /* ====================================================================
5 * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 * acknowledgment:
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com). */
55
56 #include <openssl/evp.h>
57
58 #include <openssl/err.h>
59
60 #include "internal.h"
61 #include "../digest/internal.h"
62
63
64 static const struct evp_md_pctx_ops md_pctx_ops = {
65 EVP_PKEY_CTX_free,
66 EVP_PKEY_CTX_dup,
67 };
68
do_sigver_init(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey,int is_verify)69 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
70 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
71 int is_verify) {
72 if (ctx->pctx == NULL) {
73 ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
74 }
75 if (ctx->pctx == NULL) {
76 return 0;
77 }
78 ctx->pctx_ops = &md_pctx_ops;
79
80 if (type == NULL) {
81 OPENSSL_PUT_ERROR(EVP, EVP_R_NO_DEFAULT_DIGEST);
82 return 0;
83 }
84
85 if (is_verify) {
86 if (!EVP_PKEY_verify_init(ctx->pctx)) {
87 return 0;
88 }
89 } else {
90 if (!EVP_PKEY_sign_init(ctx->pctx)) {
91 return 0;
92 }
93 }
94 if (!EVP_PKEY_CTX_set_signature_md(ctx->pctx, type)) {
95 return 0;
96 }
97 if (pctx) {
98 *pctx = ctx->pctx;
99 }
100 if (!EVP_DigestInit_ex(ctx, type, e)) {
101 return 0;
102 }
103 return 1;
104 }
105
EVP_DigestSignInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)106 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
107 ENGINE *e, EVP_PKEY *pkey) {
108 return do_sigver_init(ctx, pctx, type, e, pkey, 0);
109 }
110
EVP_DigestVerifyInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)111 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
112 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) {
113 return do_sigver_init(ctx, pctx, type, e, pkey, 1);
114 }
115
EVP_DigestSignUpdate(EVP_MD_CTX * ctx,const void * data,size_t len)116 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
117 return EVP_DigestUpdate(ctx, data, len);
118 }
119
EVP_DigestVerifyUpdate(EVP_MD_CTX * ctx,const void * data,size_t len)120 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
121 return EVP_DigestUpdate(ctx, data, len);
122 }
123
EVP_DigestSignFinal(EVP_MD_CTX * ctx,uint8_t * out_sig,size_t * out_sig_len)124 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig,
125 size_t *out_sig_len) {
126 if (out_sig) {
127 EVP_MD_CTX tmp_ctx;
128 int ret;
129 uint8_t md[EVP_MAX_MD_SIZE];
130 unsigned int mdlen;
131
132 EVP_MD_CTX_init(&tmp_ctx);
133 ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) &&
134 EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) &&
135 EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen);
136 EVP_MD_CTX_cleanup(&tmp_ctx);
137
138 return ret;
139 } else {
140 size_t s = EVP_MD_size(ctx->digest);
141 return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s);
142 }
143 }
144
EVP_DigestVerifyFinal(EVP_MD_CTX * ctx,const uint8_t * sig,size_t sig_len)145 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
146 size_t sig_len) {
147 EVP_MD_CTX tmp_ctx;
148 int ret;
149 uint8_t md[EVP_MAX_MD_SIZE];
150 unsigned int mdlen;
151
152 EVP_MD_CTX_init(&tmp_ctx);
153 ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) &&
154 EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) &&
155 EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen);
156 EVP_MD_CTX_cleanup(&tmp_ctx);
157
158 return ret;
159 }
160