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a_sign.c
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1 /* crypto/asn1/a_sign.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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  * [email protected].
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  * ([email protected]). This product includes software written by Tim
108  * Hudson ([email protected]).
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 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  int i,inl=0,outl=0,outll=0;
137  X509_ALGOR *a;
138 
139  EVP_MD_CTX_init(&ctx);
140  for (i=0; i<2; i++)
141  {
142  if (i == 0)
143  a=algor1;
144  else
145  a=algor2;
146  if (a == NULL) continue;
147  if (type->pkey_type == NID_dsaWithSHA1)
148  {
149  /* special case: RFC 2459 tells us to omit 'parameters'
150  * with id-dsa-with-sha1 */
151  ASN1_TYPE_free(a->parameter);
152  a->parameter = NULL;
153  }
154  else if ((a->parameter == NULL) ||
155  (a->parameter->type != V_ASN1_NULL))
156  {
157  ASN1_TYPE_free(a->parameter);
158  if ((a->parameter=ASN1_TYPE_new()) == NULL) goto err;
159  a->parameter->type=V_ASN1_NULL;
160  }
161  ASN1_OBJECT_free(a->algorithm);
162  a->algorithm=OBJ_nid2obj(type->pkey_type);
163  if (a->algorithm == NULL)
164  {
165  ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_UNKNOWN_OBJECT_TYPE);
166  goto err;
167  }
168  if (a->algorithm->length == 0)
169  {
170  ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
171  goto err;
172  }
173  }
174  inl=i2d(data,NULL);
175  buf_in=(unsigned char *)OPENSSL_malloc((unsigned int)inl);
176  outll=outl=EVP_PKEY_size(pkey);
177  buf_out=(unsigned char *)OPENSSL_malloc((unsigned int)outl);
178  if ((buf_in == NULL) || (buf_out == NULL))
179  {
180  outl=0;
181  ASN1err(ASN1_F_ASN1_SIGN,ERR_R_MALLOC_FAILURE);
182  goto err;
183  }
184  p=buf_in;
185 
186  i2d(data,&p);
187  if (!EVP_SignInit_ex(&ctx,type, NULL)
188  || !EVP_SignUpdate(&ctx,(unsigned char *)buf_in,inl)
189  || !EVP_SignFinal(&ctx,(unsigned char *)buf_out,
190  (unsigned int *)&outl,pkey))
191  {
192  outl=0;
193  ASN1err(ASN1_F_ASN1_SIGN,ERR_R_EVP_LIB);
194  goto err;
195  }
196  if (signature->data != NULL) OPENSSL_free(signature->data);
197  signature->data=buf_out;
198  buf_out=NULL;
199  signature->length=outl;
200  /* In the interests of compatibility, I'll make sure that
201  * the bit string has a 'not-used bits' value of 0
202  */
203  signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
204  signature->flags|=ASN1_STRING_FLAG_BITS_LEFT;
205 err:
206  EVP_MD_CTX_cleanup(&ctx);
207  if (buf_in != NULL)
208  { OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); }
209  if (buf_out != NULL)
210  { OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); }
211  return(outl);
212  }
213 
214 #endif
215 
216 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
217  ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey,
218  const EVP_MD *type)
219  {
220  EVP_MD_CTX ctx;
221  EVP_MD_CTX_init(&ctx);
222  if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey))
223  {
224  EVP_MD_CTX_cleanup(&ctx);
225  return 0;
226  }
227  return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);
228  }
229 
230 
231 int ASN1_item_sign_ctx(const ASN1_ITEM *it,
232  X509_ALGOR *algor1, X509_ALGOR *algor2,
233  ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
234  {
235  const EVP_MD *type;
236  EVP_PKEY *pkey;
237  unsigned char *buf_in=NULL,*buf_out=NULL;
238  size_t inl=0,outl=0,outll=0;
239  int signid, paramtype;
240  int rv;
241 
242  type = EVP_MD_CTX_md(ctx);
243  pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
244 
245  if (!type || !pkey)
246  {
247  ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
248  return 0;
249  }
250 
251  if (pkey->ameth->item_sign)
252  {
253  rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2,
254  signature);
255  if (rv == 1)
256  outl = signature->length;
257  /* Return value meanings:
258  * <=0: error.
259  * 1: method does everything.
260  * 2: carry on as normal.
261  * 3: ASN1 method sets algorithm identifiers: just sign.
262  */
263  if (rv <= 0)
264  ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
265  if (rv <= 1)
266  goto err;
267  }
268  else
269  rv = 2;
270 
271  if (rv == 2)
272  {
273  if (type->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE)
274  {
275  if (!pkey->ameth ||
276  !OBJ_find_sigid_by_algs(&signid,
277  EVP_MD_nid(type),
278  pkey->ameth->pkey_id))
279  {
280  ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
281  ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
282  return 0;
283  }
284  }
285  else
286  signid = type->pkey_type;
287 
288  if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
289  paramtype = V_ASN1_NULL;
290  else
291  paramtype = V_ASN1_UNDEF;
292 
293  if (algor1)
294  X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
295  if (algor2)
296  X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
297 
298  }
299 
300  inl=ASN1_item_i2d(asn,&buf_in, it);
301  outll=outl=EVP_PKEY_size(pkey);
302  buf_out=OPENSSL_malloc((unsigned int)outl);
303  if ((buf_in == NULL) || (buf_out == NULL))
304  {
305  outl=0;
306  ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,ERR_R_MALLOC_FAILURE);
307  goto err;
308  }
309 
310  if (!EVP_DigestSignUpdate(ctx, buf_in, inl)
311  || !EVP_DigestSignFinal(ctx, buf_out, &outl))
312  {
313  outl=0;
314  ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,ERR_R_EVP_LIB);
315  goto err;
316  }
317  if (signature->data != NULL) OPENSSL_free(signature->data);
318  signature->data=buf_out;
319  buf_out=NULL;
320  signature->length=outl;
321  /* In the interests of compatibility, I'll make sure that
322  * the bit string has a 'not-used bits' value of 0
323  */
324  signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
325  signature->flags|=ASN1_STRING_FLAG_BITS_LEFT;
326 err:
327  EVP_MD_CTX_cleanup(ctx);
328  if (buf_in != NULL)
329  { OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); }
330  if (buf_out != NULL)
331  { OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); }
332  return(outl);
333  }
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