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1/* $OpenBSD: a_sign.c,v 1.20 2015/07/19 18:29:31 miod Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#include <sys/types.h>
113
114#include <stdio.h>
115#include <time.h>
116
117#include <openssl/bn.h>
118#include <openssl/buffer.h>
119#include <openssl/err.h>
120#include <openssl/evp.h>
121#include <openssl/objects.h>
122#include <openssl/x509.h>
123
124#include "asn1_locl.h"
125
126int
127ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
128 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey, const EVP_MD *type)
129{
130 EVP_MD_CTX ctx;
131 EVP_MD_CTX_init(&ctx);
132 if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) {
133 EVP_MD_CTX_cleanup(&ctx);
134 return 0;
135 }
136 return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);
137}
138
139
140int
141ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
142 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
143{
144 const EVP_MD *type;
145 EVP_PKEY *pkey;
146 unsigned char *buf_in = NULL, *buf_out = NULL;
147 size_t inl = 0, outl = 0, outll = 0;
148 int signid, paramtype;
149 int rv;
150
151 type = EVP_MD_CTX_md(ctx);
152 pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
153
154 if (!type || !pkey) {
155 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
156 ASN1_R_CONTEXT_NOT_INITIALISED);
157 return 0;
158 }
159
160 if (pkey->ameth->item_sign) {
161 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2,
162 signature);
163 if (rv == 1)
164 outl = signature->length;
165 /* Return value meanings:
166 * <=0: error.
167 * 1: method does everything.
168 * 2: carry on as normal.
169 * 3: ASN1 method sets algorithm identifiers: just sign.
170 */
171 if (rv <= 0)
172 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
173 if (rv <= 1)
174 goto err;
175 } else
176 rv = 2;
177
178 if (rv == 2) {
179 if (type->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) {
180 if (!pkey->ameth ||
181 !OBJ_find_sigid_by_algs(&signid,
182 EVP_MD_nid(type), pkey->ameth->pkey_id)) {
183 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
184 ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
185 return 0;
186 }
187 } else
188 signid = type->pkey_type;
189
190 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
191 paramtype = V_ASN1_NULL;
192 else
193 paramtype = V_ASN1_UNDEF;
194
195 if (algor1)
196 X509_ALGOR_set0(algor1,
197 OBJ_nid2obj(signid), paramtype, NULL);
198 if (algor2)
199 X509_ALGOR_set0(algor2,
200 OBJ_nid2obj(signid), paramtype, NULL);
201
202 }
203
204 inl = ASN1_item_i2d(asn, &buf_in, it);
205 outll = outl = EVP_PKEY_size(pkey);
206 buf_out = malloc(outl);
207 if ((buf_in == NULL) || (buf_out == NULL)) {
208 outl = 0;
209 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
210 goto err;
211 }
212
213 if (!EVP_DigestSignUpdate(ctx, buf_in, inl) ||
214 !EVP_DigestSignFinal(ctx, buf_out, &outl)) {
215 outl = 0;
216 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
217 goto err;
218 }
219 free(signature->data);
220 signature->data = buf_out;
221 buf_out = NULL;
222 signature->length = outl;
223 /* In the interests of compatibility, I'll make sure that
224 * the bit string has a 'not-used bits' value of 0
225 */
226 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
227 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
228
229err:
230 EVP_MD_CTX_cleanup(ctx);
231 if (buf_in != NULL) {
232 OPENSSL_cleanse((char *)buf_in, inl);
233 free(buf_in);
234 }
235 if (buf_out != NULL) {
236 OPENSSL_cleanse((char *)buf_out, outll);
237 free(buf_out);
238 }
239 return (outl);
240}
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