Line data Source code
1 : /* crypto/asn1/a_sign.c */
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 <stdio.h>
113 : #include <time.h>
114 :
115 : #include "cryptlib.h"
116 :
117 : #ifndef NO_SYS_TYPES_H
118 : # include <sys/types.h>
119 : #endif
120 :
121 : #include <openssl/bn.h>
122 : #include <openssl/evp.h>
123 : #include <openssl/x509.h>
124 : #include <openssl/objects.h>
125 : #include <openssl/buffer.h>
126 : #include "asn1_locl.h"
127 :
128 : #ifndef NO_ASN1_OLD
129 :
130 0 : int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
131 : ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
132 : const EVP_MD *type)
133 : {
134 : EVP_MD_CTX ctx;
135 : unsigned char *p, *buf_in = NULL, *buf_out = NULL;
136 0 : int i, inl = 0, outl = 0, outll = 0;
137 : X509_ALGOR *a;
138 :
139 0 : EVP_MD_CTX_init(&ctx);
140 0 : for (i = 0; i < 2; i++) {
141 0 : if (i == 0)
142 : a = algor1;
143 : else
144 : a = algor2;
145 0 : if (a == NULL)
146 0 : continue;
147 0 : if (type->pkey_type == NID_dsaWithSHA1) {
148 : /*
149 : * special case: RFC 2459 tells us to omit 'parameters' with
150 : * id-dsa-with-sha1
151 : */
152 0 : ASN1_TYPE_free(a->parameter);
153 0 : a->parameter = NULL;
154 0 : } else if ((a->parameter == NULL) ||
155 0 : (a->parameter->type != V_ASN1_NULL)) {
156 0 : ASN1_TYPE_free(a->parameter);
157 0 : if ((a->parameter = ASN1_TYPE_new()) == NULL)
158 : goto err;
159 0 : a->parameter->type = V_ASN1_NULL;
160 : }
161 0 : ASN1_OBJECT_free(a->algorithm);
162 0 : a->algorithm = OBJ_nid2obj(type->pkey_type);
163 0 : if (a->algorithm == NULL) {
164 0 : ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);
165 0 : goto err;
166 : }
167 0 : if (a->algorithm->length == 0) {
168 0 : ASN1err(ASN1_F_ASN1_SIGN,
169 : ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
170 0 : goto err;
171 : }
172 : }
173 0 : inl = i2d(data, NULL);
174 0 : buf_in = (unsigned char *)OPENSSL_malloc((unsigned int)inl);
175 0 : outll = outl = EVP_PKEY_size(pkey);
176 0 : buf_out = (unsigned char *)OPENSSL_malloc((unsigned int)outl);
177 0 : if ((buf_in == NULL) || (buf_out == NULL)) {
178 0 : outl = 0;
179 0 : ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
180 0 : goto err;
181 : }
182 0 : p = buf_in;
183 :
184 0 : i2d(data, &p);
185 0 : if (!EVP_SignInit_ex(&ctx, type, NULL)
186 0 : || !EVP_SignUpdate(&ctx, (unsigned char *)buf_in, inl)
187 0 : || !EVP_SignFinal(&ctx, (unsigned char *)buf_out,
188 : (unsigned int *)&outl, pkey)) {
189 0 : outl = 0;
190 0 : ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
191 0 : goto err;
192 : }
193 0 : if (signature->data != NULL)
194 0 : OPENSSL_free(signature->data);
195 0 : signature->data = buf_out;
196 : buf_out = NULL;
197 0 : signature->length = outl;
198 : /*
199 : * In the interests of compatibility, I'll make sure that the bit string
200 : * has a 'not-used bits' value of 0
201 : */
202 0 : signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
203 0 : signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
204 : err:
205 0 : EVP_MD_CTX_cleanup(&ctx);
206 0 : if (buf_in != NULL) {
207 0 : OPENSSL_cleanse((char *)buf_in, (unsigned int)inl);
208 0 : OPENSSL_free(buf_in);
209 : }
210 0 : if (buf_out != NULL) {
211 0 : OPENSSL_cleanse((char *)buf_out, outll);
212 0 : OPENSSL_free(buf_out);
213 : }
214 0 : return (outl);
215 : }
216 :
217 : #endif
218 :
219 0 : int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
220 : X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
221 : EVP_PKEY *pkey, const EVP_MD *type)
222 : {
223 : EVP_MD_CTX ctx;
224 0 : EVP_MD_CTX_init(&ctx);
225 0 : if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) {
226 0 : EVP_MD_CTX_cleanup(&ctx);
227 0 : return 0;
228 : }
229 0 : return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);
230 : }
231 :
232 0 : int ASN1_item_sign_ctx(const ASN1_ITEM *it,
233 : X509_ALGOR *algor1, X509_ALGOR *algor2,
234 : ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
235 : {
236 : const EVP_MD *type;
237 : EVP_PKEY *pkey;
238 0 : unsigned char *buf_in = NULL, *buf_out = NULL;
239 0 : size_t inl = 0, outl = 0, outll = 0;
240 : int signid, paramtype;
241 : int rv;
242 :
243 0 : type = EVP_MD_CTX_md(ctx);
244 0 : pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
245 :
246 0 : if (!type || !pkey) {
247 0 : ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
248 0 : return 0;
249 : }
250 :
251 0 : if (pkey->ameth->item_sign) {
252 0 : rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
253 0 : if (rv == 1)
254 0 : outl = signature->length;
255 : /*-
256 : * Return value meanings:
257 : * <=0: error.
258 : * 1: method does everything.
259 : * 2: carry on as normal.
260 : * 3: ASN1 method sets algorithm identifiers: just sign.
261 : */
262 0 : if (rv <= 0)
263 0 : ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
264 0 : if (rv <= 1)
265 : goto err;
266 : } else
267 : rv = 2;
268 :
269 0 : if (rv == 2) {
270 0 : if (type->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) {
271 0 : if (!pkey->ameth ||
272 0 : !OBJ_find_sigid_by_algs(&signid,
273 : EVP_MD_nid(type),
274 : pkey->ameth->pkey_id)) {
275 0 : ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
276 : ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
277 0 : return 0;
278 : }
279 : } else
280 0 : signid = type->pkey_type;
281 :
282 0 : if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
283 : paramtype = V_ASN1_NULL;
284 : else
285 : paramtype = V_ASN1_UNDEF;
286 :
287 0 : if (algor1)
288 0 : X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
289 0 : if (algor2)
290 0 : X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
291 :
292 : }
293 :
294 0 : inl = ASN1_item_i2d(asn, &buf_in, it);
295 0 : outll = outl = EVP_PKEY_size(pkey);
296 0 : buf_out = OPENSSL_malloc((unsigned int)outl);
297 0 : if ((buf_in == NULL) || (buf_out == NULL)) {
298 0 : outl = 0;
299 0 : ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
300 0 : goto err;
301 : }
302 :
303 0 : if (!EVP_DigestSignUpdate(ctx, buf_in, inl)
304 0 : || !EVP_DigestSignFinal(ctx, buf_out, &outl)) {
305 0 : outl = 0;
306 0 : ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
307 0 : goto err;
308 : }
309 0 : if (signature->data != NULL)
310 0 : OPENSSL_free(signature->data);
311 0 : signature->data = buf_out;
312 : buf_out = NULL;
313 0 : signature->length = outl;
314 : /*
315 : * In the interests of compatibility, I'll make sure that the bit string
316 : * has a 'not-used bits' value of 0
317 : */
318 0 : signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
319 0 : signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
320 : err:
321 0 : EVP_MD_CTX_cleanup(ctx);
322 0 : if (buf_in != NULL) {
323 0 : OPENSSL_cleanse((char *)buf_in, (unsigned int)inl);
324 0 : OPENSSL_free(buf_in);
325 : }
326 0 : if (buf_out != NULL) {
327 0 : OPENSSL_cleanse((char *)buf_out, outll);
328 0 : OPENSSL_free(buf_out);
329 : }
330 0 : return (outl);
331 : }
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