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1/* crypto/pkcs7/pk7_doit.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#include <stdio.h>
60#include "cryptlib.h"
61#include "rand.h"
62#include "objects.h"
63#include "x509.h"
64
65BIO *PKCS7_dataInit(p7,bio)
66PKCS7 *p7;
67BIO *bio;
68 {
69 int i,j;
70 BIO *out=NULL,*btmp;
71 X509_ALGOR *xa;
72 EVP_MD *evp_md;
73 EVP_CIPHER *evp_cipher=NULL;
74 STACK *md_sk=NULL,*rsk=NULL;
75 X509_ALGOR *xalg=NULL;
76 PKCS7_RECIP_INFO *ri=NULL;
77 EVP_PKEY *pkey;
78
79 i=OBJ_obj2nid(p7->type);
80 p7->state=PKCS7_S_HEADER;
81
82 switch (i)
83 {
84 case NID_pkcs7_signed:
85 md_sk=p7->d.sign->md_algs;
86 break;
87 case NID_pkcs7_signedAndEnveloped:
88 rsk=p7->d.signed_and_enveloped->recipientinfo;
89 md_sk=p7->d.signed_and_enveloped->md_algs;
90 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
91 if (evp_cipher == NULL)
92 {
93 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
94 goto err;
95 }
96 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
97 break;
98 default:
99 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
100 goto err;
101 }
102
103 if (md_sk != NULL)
104 {
105 for (i=0; i<sk_num(md_sk); i++)
106 {
107 xa=(X509_ALGOR *)sk_value(md_sk,i);
108 if ((btmp=BIO_new(BIO_f_md())) == NULL) goto err;
109
110 j=OBJ_obj2nid(xa->algorithm);
111 evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
112 if (evp_md == NULL)
113 {
114 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
115 goto err;
116 }
117
118 BIO_set_md(btmp,evp_md);
119 if (out == NULL)
120 out=btmp;
121 else
122 BIO_push(out,btmp);
123 }
124 }
125
126 if (evp_cipher != NULL)
127 {
128 unsigned char key[EVP_MAX_KEY_LENGTH];
129 unsigned char iv[EVP_MAX_IV_LENGTH];
130 int keylen,ivlen;
131 int jj,max;
132 unsigned char *tmp;
133
134 if ((btmp=BIO_new(BIO_f_cipher())) == NULL) goto err;
135 keylen=EVP_CIPHER_key_length(evp_cipher);
136 ivlen=EVP_CIPHER_iv_length(evp_cipher);
137
138 if (ivlen > 0)
139 {
140 ASN1_OCTET_STRING *os;
141
142 RAND_bytes(iv,ivlen);
143 os=ASN1_OCTET_STRING_new();
144 ASN1_OCTET_STRING_set(os,iv,ivlen);
145 /* ASN1_TYPE_set(xalg->parameter,V_ASN1_OCTET_STRING,
146 (char *)os);
147 */ }
148 RAND_bytes(key,keylen);
149
150 /* Lets do the pub key stuff :-) */
151 max=0;
152 for (i=0; i<sk_num(rsk); i++)
153 {
154 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
155 if (ri->cert == NULL) abort();
156 pkey=X509_get_pubkey(ri->cert);
157 jj=EVP_PKEY_size(pkey);
158 if (max < jj) max=jj;
159 }
160 if ((tmp=(unsigned char *)Malloc(max)) == NULL) abort();
161 for (i=0; i<sk_num(rsk); i++)
162 {
163 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
164 pkey=X509_get_pubkey(ri->cert);
165 jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
166 if (jj <= 0) abort();
167 ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
168 }
169
170 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
171
172 if (out == NULL)
173 out=btmp;
174 else
175 BIO_push(out,btmp);
176 }
177
178 if (bio == NULL) /* ??????????? */
179 {
180 if (p7->detached)
181 bio=BIO_new(BIO_s_null());
182 else
183 {
184 bio=BIO_new(BIO_s_mem());
185 if (PKCS7_type_is_signed(p7) &&
186 PKCS7_type_is_data(p7->d.sign->contents))
187 {
188 ASN1_OCTET_STRING *os;
189
190 os=p7->d.sign->contents->d.data;
191 if (os->length > 0)
192 BIO_write(bio,(char *)os->data,
193 os->length);
194 }
195 }
196 }
197 BIO_push(out,bio);
198 return(out);
199err:
200 return(NULL);
201 }
202
203int PKCS7_dataSign(p7,bio)
204PKCS7 *p7;
205BIO *bio;
206 {
207 int ret=0;
208 int i,j;
209 BIO *btmp;
210 BUF_MEM *buf_mem=NULL;
211 BUF_MEM *buf=NULL;
212 PKCS7_SIGNER_INFO *si;
213 EVP_MD_CTX *mdc,ctx_tmp;
214 STACK *sk,*si_sk=NULL;
215 unsigned char *p,*pp=NULL;
216 int x;
217 ASN1_OCTET_STRING *os=NULL;
218
219 i=OBJ_obj2nid(p7->type);
220 p7->state=PKCS7_S_HEADER;
221
222 switch (i)
223 {
224 case NID_pkcs7_signedAndEnveloped:
225 /* XXXXXXXXXXXXXXXX */
226 si_sk=p7->d.signed_and_enveloped->signer_info;
227 os=ASN1_OCTET_STRING_new();
228 p7->d.signed_and_enveloped->enc_data->enc_data=os;
229 break;
230 case NID_pkcs7_signed:
231 si_sk=p7->d.sign->signer_info;
232 os=p7->d.sign->contents->d.data;
233 break;
234 }
235
236 if (si_sk != NULL)
237 {
238 if ((buf=BUF_MEM_new()) == NULL) goto err;
239 for (i=0; i<sk_num(si_sk); i++)
240 {
241 si=(PKCS7_SIGNER_INFO *)
242 sk_value(si_sk,i);
243 if (si->pkey == NULL)
244 continue;
245 j=OBJ_obj2nid(si->digest_enc_alg->algorithm);
246
247 btmp=bio;
248 for (;;)
249 {
250 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
251 == NULL)
252 {
253 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
254 goto err;
255 }
256 BIO_get_md_ctx(btmp,&mdc);
257 if (mdc == NULL)
258 {
259 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
260 goto err;
261 }
262 if (EVP_MD_pkey_type(EVP_MD_CTX_type(mdc)) == j)
263 break;
264 else
265 btmp=btmp->next_bio;
266 }
267
268 /* We now have the EVP_MD_CTX, lets do the
269 * signing. */
270 memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
271 if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
272 goto err;
273
274 sk=si->auth_attr;
275 if ((sk != NULL) && (sk_num(sk) != 0))
276 {
277 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
278 V_ASN1_SET,V_ASN1_UNIVERSAL);
279 pp=(unsigned char *)Malloc(i);
280 p=pp;
281 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
282 V_ASN1_SET,V_ASN1_UNIVERSAL);
283 EVP_SignUpdate(&ctx_tmp,pp,x);
284 Free(pp);
285 }
286
287 if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
288 (unsigned int *)&buf->length,si->pkey))
289 goto err;
290 if (!ASN1_STRING_set(si->enc_digest,
291 (unsigned char *)buf->data,buf->length))
292 goto err;
293 }
294 if (p7->detached)
295 ASN1_OCTET_STRING_set(os,(unsigned char *)"",0);
296 else
297 {
298 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
299 if (btmp == NULL)
300 {
301 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
302 goto err;
303 }
304 BIO_get_mem_ptr(btmp,&buf_mem);
305 ASN1_OCTET_STRING_set(os,
306 (unsigned char *)buf_mem->data,buf_mem->length);
307 }
308 if (pp != NULL) Free(pp);
309 pp=NULL;
310 }
311
312 ret=1;
313err:
314 if (buf != NULL) BUF_MEM_free(buf);
315 return(ret);
316 }
317
318int PKCS7_dataVerify(cert_store,ctx,bio,p7,si)
319X509_STORE *cert_store;
320X509_STORE_CTX *ctx;
321BIO *bio;
322PKCS7 *p7;
323PKCS7_SIGNER_INFO *si;
324 {
325 PKCS7_SIGNED *s;
326 ASN1_OCTET_STRING *os;
327 EVP_MD_CTX mdc_tmp,*mdc;
328 unsigned char *pp,*p;
329 PKCS7_ISSUER_AND_SERIAL *ias;
330 int ret=0,md_type,i;
331 STACK *sk;
332 BIO *btmp;
333 X509 *x509;
334
335 if (!PKCS7_type_is_signed(p7)) abort();
336 /* XXXXXXXXXXXXXXXXXXXXXXX */
337 ias=si->issuer_and_serial;
338 s=p7->d.sign;
339
340 x509=X509_find_by_issuer_and_serial(s->cert,ias->issuer,ias->serial);
341
342 /* were we able to find the cert in passed to us */
343 if (x509 == NULL)
344 {
345 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
346 goto err;
347 }
348
349 /* Lets verify */
350 X509_STORE_CTX_init(ctx,cert_store,x509,s->cert);
351 i=X509_verify_cert(ctx);
352 if (i <= 0) goto err;
353 X509_STORE_CTX_cleanup(ctx);
354
355 /* So we like 'x509', lets check the signature. */
356 md_type=OBJ_obj2nid(si->digest_alg->algorithm);
357
358 btmp=bio;
359 for (;;)
360 {
361 if ((btmp == NULL) ||
362 ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
363 {
364 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
365 goto err;
366 }
367 BIO_get_md_ctx(btmp,&mdc);
368 if (mdc == NULL)
369 {
370 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
371 goto err;
372 }
373 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
374 break;
375 btmp=btmp->next_bio;
376 }
377
378 /* mdc is the digest ctx that we want */
379 memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
380
381 sk=si->auth_attr;
382 if ((sk != NULL) && (sk_num(sk) != 0))
383 {
384 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
385 V_ASN1_SET,V_ASN1_UNIVERSAL);
386 pp=(unsigned char *)malloc(i);
387 p=pp;
388 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
389 V_ASN1_SET,V_ASN1_UNIVERSAL);
390 EVP_VerifyUpdate(&mdc_tmp,pp,i);
391 free(pp);
392 }
393
394 os=si->enc_digest;
395 i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length,
396 X509_get_pubkey(x509));
397 if (i <= 0)
398 {
399 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
400 ret= -1;
401 goto err;
402 }
403 else
404 ret=1;
405err:
406 return(ret);
407 }
408