crypto/pkcs7/pk7_doit.c

   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 <openssl/rand.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/x509.h>
  64
  65 static int add_attribute(STACK **sk, int nid, int atrtype, void *value);
  66 static ASN1_TYPE *get_attribute(STACK *sk, int nid);
  67
  68 #if 1
  69 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
  70         {
  71         int i,j;
  72         BIO *out=NULL,*btmp=NULL;
  73         X509_ALGOR *xa;
  74         const EVP_MD *evp_md;
  75         const EVP_CIPHER *evp_cipher=NULL;
  76         STACK *md_sk=NULL,*rsk=NULL;
  77         X509_ALGOR *xalg=NULL;
  78         PKCS7_RECIP_INFO *ri=NULL;
  79         EVP_PKEY *pkey;
  80
  81         i=OBJ_obj2nid(p7->type);
  82         p7->state=PKCS7_S_HEADER;
  83
  84         switch (i)
  85                 {
  86         case NID_pkcs7_signed:
  87                 md_sk=p7->d.sign->md_algs;
  88                 break;
  89         case NID_pkcs7_signedAndEnveloped:
  90                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  91                 md_sk=p7->d.signed_and_enveloped->md_algs;
  92                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
  93                 if (evp_cipher == NULL)
  94                         {
  95                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
  96                         goto err;
  97                         }
  98                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  99                 break;
 100         case NID_pkcs7_enveloped:
 101                 rsk=p7->d.enveloped->recipientinfo;
 102                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.enveloped->enc_data->algorithm->algorithm)));
 103                 if (evp_cipher == NULL)
 104                         {
 105                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 106                         goto err;
 107                         }
 108                 xalg=p7->d.enveloped->enc_data->algorithm;
 109                 break;
 110         default:
 111                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 112                 goto err;
 113                 }
 114
 115         if (md_sk != NULL)
 116                 {
 117                 for (i=0; i<sk_num(md_sk); i++)
 118                         {
 119                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 120                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 121                                 {
 122                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 123                                 goto err;
 124                                 }
 125
 126                         j=OBJ_obj2nid(xa->algorithm);
 127                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 128                         if (evp_md == NULL)
 129                                 {
 130                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 131                                 goto err;
 132                                 }
 133
 134                         BIO_set_md(btmp,evp_md);
 135                         if (out == NULL)
 136                                 out=btmp;
 137                         else
 138                                 BIO_push(out,btmp);
 139                         btmp=NULL;
 140                         }
 141                 }
 142
 143         if (evp_cipher != NULL)
 144                 {
 145                 unsigned char key[EVP_MAX_KEY_LENGTH];
 146                 unsigned char iv[EVP_MAX_IV_LENGTH];
 147                 int keylen,ivlen;
 148                 int jj,max;
 149                 unsigned char *tmp;
 150
 151                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 152                         {
 153                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 154                         goto err;
 155                         }
 156                 keylen=EVP_CIPHER_key_length(evp_cipher);
 157                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 158
 159                 if (ivlen > 0) {
 160                         EVP_CIPHER_CTX *ctx;
 161                         BIO_get_cipher_ctx(btmp, &ctx);
 162                         if (xalg->parameter == NULL)
 163                                                 xalg->parameter=ASN1_TYPE_new();
 164                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 165                                                                        goto err;
 166                 }
 167                 RAND_bytes(key,keylen);
 168
 169                 /* Lets do the pub key stuff :-) */
 170                 max=0;
 171                 for (i=0; i<sk_num(rsk); i++)
 172                         {
 173                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 174                         if (ri->cert == NULL)
 175                                 {
 176                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 177                                 goto err;
 178                                 }
 179                         pkey=X509_get_pubkey(ri->cert);
 180                         jj=EVP_PKEY_size(pkey);
 181                         EVP_PKEY_free(pkey);
 182                         if (max < jj) max=jj;
 183                         }
 184                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 185                         {
 186                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 187                         goto err;
 188                         }
 189                 for (i=0; i<sk_num(rsk); i++)
 190                         {
 191                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 192                         pkey=X509_get_pubkey(ri->cert);
 193                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 194                         EVP_PKEY_free(pkey);
 195                         if (jj <= 0)
 196                                 {
 197                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 198                                 Free(tmp);
 199                                 goto err;
 200                                 }
 201                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 202                         }
 203                 Free(tmp);
 204
 205                 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
 206
 207                 if (out == NULL)
 208                         out=btmp;
 209                 else
 210                         BIO_push(out,btmp);
 211                 btmp=NULL;
 212                 }
 213
 214         if (bio == NULL) /* ??????????? */
 215                 {
 216                 if (p7->detached)
 217                         bio=BIO_new(BIO_s_null());
 218                 else
 219                         {
 220                         bio=BIO_new(BIO_s_mem());
 221                         /* We need to set this so that when we have read all
 222                          * the data, the encrypt BIO, if present, will read
 223                          * EOF and encode the last few bytes */
 224                         BIO_set_mem_eof_return(bio,0);
 225
 226                         if (PKCS7_type_is_signed(p7) &&
 227                                 PKCS7_type_is_data(p7->d.sign->contents))
 228                                 {
 229                                 ASN1_OCTET_STRING *os;
 230
 231                                 os=p7->d.sign->contents->d.data;
 232                                 if (os->length > 0)
 233                                         BIO_write(bio,(char *)os->data,
 234                                                 os->length);
 235                                 }
 236                         }
 237                 }
 238         BIO_push(out,bio);
 239         bio=NULL;
 240         if (0)
 241                 {
 242 err:
 243                 if (out != NULL)
 244                         BIO_free_all(out);
 245                 if (btmp != NULL)
 246                         BIO_free_all(btmp);
 247                 out=NULL;
 248                 }
 249         return(out);
 250         }
 251
 252 /* int */
 253 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio,
 254              X509_STORE *xs)
 255         {
 256         int i,j;
 257         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 258         char *tmp=NULL;
 259         X509_ALGOR *xa;
 260         ASN1_OCTET_STRING *data_body=NULL;
 261         const EVP_MD *evp_md;
 262         const EVP_CIPHER *evp_cipher=NULL;
 263         EVP_CIPHER_CTX *evp_ctx=NULL;
 264         X509_ALGOR *enc_alg=NULL;
 265         STACK *md_sk=NULL,*rsk=NULL;
 266         X509_ALGOR *xalg=NULL;
 267         PKCS7_RECIP_INFO *ri=NULL;
 268 /*      EVP_PKEY *pkey; */
 269 #if 0
 270         X509_STORE_CTX s_ctx;
 271 #endif
 272
 273         i=OBJ_obj2nid(p7->type);
 274         p7->state=PKCS7_S_HEADER;
 275
 276         switch (i)
 277                 {
 278         case NID_pkcs7_signed:
 279                 data_body=p7->d.sign->contents->d.data;
 280                 md_sk=p7->d.sign->md_algs;
 281                 break;
 282         case NID_pkcs7_signedAndEnveloped:
 283                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 284                 md_sk=p7->d.signed_and_enveloped->md_algs;
 285                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 286                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 287                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 288                 if (evp_cipher == NULL)
 289                         {
 290                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 291                         goto err;
 292                         }
 293                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 294                 break;
 295         case NID_pkcs7_enveloped:
 296                 rsk=p7->d.enveloped->recipientinfo;
 297                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 298                 data_body=p7->d.enveloped->enc_data->enc_data;
 299                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 300                 if (evp_cipher == NULL)
 301                         {
 302                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 303                         goto err;
 304                         }
 305                 xalg=p7->d.enveloped->enc_data->algorithm;
 306                 break;
 307         default:
 308                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 309                 goto err;
 310                 }
 311
 312         /* We will be checking the signature */
 313         if (md_sk != NULL)
 314                 {
 315                 for (i=0; i<sk_num(md_sk); i++)
 316                         {
 317                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 318                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 319                                 {
 320                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
 321                                 goto err;
 322                                 }
 323
 324                         j=OBJ_obj2nid(xa->algorithm);
 325                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 326                         if (evp_md == NULL)
 327                                 {
 328                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 329                                 goto err;
 330                                 }
 331
 332                         BIO_set_md(btmp,evp_md);
 333                         if (out == NULL)
 334                                 out=btmp;
 335                         else
 336                                 BIO_push(out,btmp);
 337                         btmp=NULL;
 338                         }
 339                 }
 340
 341         if (evp_cipher != NULL)
 342                 {
 343 #if 0
 344                 unsigned char key[EVP_MAX_KEY_LENGTH];
 345                 unsigned char iv[EVP_MAX_IV_LENGTH];
 346                 unsigned char *p;
 347                 int keylen,ivlen;
 348                 int max;
 349                 X509_OBJECT ret;
 350 #endif
 351                 int jj;
 352
 353                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 354                         {
 355                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
 356                         goto err;
 357                         }
 358
 359                 /* It was encrypted, we need to decrypt the secret key
 360                  * with the private key */
 361
 362                 /* We need to find a private key for one of the people in the
 363                  * recipentinfo list */
 364                 if (rsk == NULL)
 365                         return(NULL);
 366
 367                 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 368 #if 0
 369                 X509_STORE_CTX_init(&s_ctx,xs,NULL,NULL);
 370                 for (i=0; i<sk_num(rsk); i++)
 371                         {
 372                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 373                         uf (X509_STORE_get_by_issuer_serial(&s_ctx,
 374                                 X509_LU_PKEY,
 375                                 ri->issuer_and_serial->issuer,
 376                                 ri->issuer_and_serial->serial,
 377                                 &ret))
 378                                 break;
 379                         ri=NULL;
 380                         }
 381                 if (ri == NULL) return(NULL);
 382                 pkey=ret.data.pkey;
 383 #endif
 384                 if (pkey == NULL)
 385                         {
 386                         return(NULL);
 387                         }
 388
 389                 jj=EVP_PKEY_size(pkey);
 390                 tmp=Malloc(jj+10);
 391                 if (tmp == NULL)
 392                         {
 393                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_MALLOC_FAILURE);
 394                         goto err;
 395                         }
 396
 397                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
 398                         ASN1_STRING_data(ri->enc_key),
 399                         ASN1_STRING_length(ri->enc_key),
 400                         pkey);
 401                 if (jj <= 0)
 402                         {
 403                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_EVP_LIB);
 404                         goto err;
 405                         }
 406
 407                 evp_ctx=NULL;
 408                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 409                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 410                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 411                         return(NULL);
 412
 413                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
 414                         {
 415                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 416                         goto err;
 417                         }
 418                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
 419
 420                 memset(tmp,0,jj);
 421
 422                 if (out == NULL)
 423                         out=etmp;
 424                 else
 425                         BIO_push(out,etmp);
 426                 etmp=NULL;
 427                 }
 428
 429 #if 1
 430         if (p7->detached || (in_bio != NULL))
 431                 {
 432                 bio=in_bio;
 433                 }
 434         else
 435                 {
 436                 bio=BIO_new(BIO_s_mem());
 437                 /* We need to set this so that when we have read all
 438                  * the data, the encrypt BIO, if present, will read
 439                  * EOF and encode the last few bytes */
 440                 BIO_set_mem_eof_return(bio,0);
 441
 442                 if (data_body->length > 0)
 443                         BIO_write(bio,(char *)data_body->data,data_body->length);
 444                 }
 445         BIO_push(out,bio);
 446         bio=NULL;
 447 #endif
 448         if (0)
 449                 {
 450 err:
 451                 if (out != NULL) BIO_free_all(out);
 452                 if (btmp != NULL) BIO_free_all(btmp);
 453                 if (etmp != NULL) BIO_free_all(etmp);
 454                 if (bio != NULL) BIO_free_all(bio);
 455                 out=NULL;
 456                 }
 457         if (tmp != NULL)
 458                 Free(tmp);
 459         return(out);
 460         }
 461 #endif
 462
 463 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 464         {
 465         int ret=0;
 466         int i,j;
 467         BIO *btmp;
 468         BUF_MEM *buf_mem=NULL;
 469         BUF_MEM *buf=NULL;
 470         PKCS7_SIGNER_INFO *si;
 471         EVP_MD_CTX *mdc,ctx_tmp;
 472         STACK *sk,*si_sk=NULL;
 473         unsigned char *p,*pp=NULL;
 474         int x;
 475         ASN1_OCTET_STRING *os=NULL;
 476
 477         i=OBJ_obj2nid(p7->type);
 478         p7->state=PKCS7_S_HEADER;
 479
 480         switch (i)
 481                 {
 482         case NID_pkcs7_signedAndEnveloped:
 483                 /* XXXXXXXXXXXXXXXX */
 484                 si_sk=p7->d.signed_and_enveloped->signer_info;
 485                 os=ASN1_OCTET_STRING_new();
 486                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 487                 break;
 488         case NID_pkcs7_enveloped:
 489                 /* XXXXXXXXXXXXXXXX */
 490                 os=ASN1_OCTET_STRING_new();
 491                 p7->d.enveloped->enc_data->enc_data=os;
 492                 break;
 493         case NID_pkcs7_signed:
 494                 si_sk=p7->d.sign->signer_info;
 495                 os=p7->d.sign->contents->d.data;
 496                 /* If detached data then the content is excluded */
 497                 if(p7->detached) {
 498                         ASN1_OCTET_STRING_free(os);
 499                         p7->d.sign->contents->d.data = NULL;
 500                 }
 501                 break;
 502                 }
 503
 504         if (si_sk != NULL)
 505                 {
 506                 if ((buf=BUF_MEM_new()) == NULL)
 507                         {
 508                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 509                         goto err;
 510                         }
 511                 for (i=0; i<sk_num(si_sk); i++)
 512                         {
 513                         si=(PKCS7_SIGNER_INFO *)
 514                                 sk_value(si_sk,i);
 515                         if (si->pkey == NULL) continue;
 516
 517                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 518
 519                         btmp=bio;
 520                         for (;;)
 521                                 {
 522                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 523                                         == NULL)
 524                                         {
 525                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 526                                         goto err;
 527                                         }
 528                                 BIO_get_md_ctx(btmp,&mdc);
 529                                 if (mdc == NULL)
 530                                         {
 531                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 532                                         goto err;
 533                                         }
 534                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 535                                         break;
 536                                 else
 537                                         btmp=btmp->next_bio;
 538                                 }
 539
 540                         /* We now have the EVP_MD_CTX, lets do the
 541                          * signing. */
 542                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 543                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 544                                 {
 545                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 546                                 goto err;
 547                                 }
 548
 549                         sk=si->auth_attr;
 550
 551                         /* If there are attributes, we add the digest
 552                          * attribute and only sign the attributes */
 553                         if ((sk != NULL) && (sk_num(sk) != 0))
 554                                 {
 555                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 556                                 unsigned int md_len;
 557                                 ASN1_OCTET_STRING *digest;
 558                                 ASN1_UTCTIME *sign_time;
 559                                 const EVP_MD *md_tmp;
 560
 561                                 /* Add signing time */
 562                                 sign_time=X509_gmtime_adj(NULL,0);
 563                                 PKCS7_add_signed_attribute(si,
 564                                         NID_pkcs9_signingTime,
 565                                         V_ASN1_UTCTIME,sign_time);
 566
 567                                 /* Add digest */
 568                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 569                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 570                                 digest=ASN1_OCTET_STRING_new();
 571                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
 572                                 PKCS7_add_signed_attribute(si,NID_pkcs9_messageDigest,
 573                                         V_ASN1_OCTET_STRING,digest);
 574
 575                                 /* Now sign the mess */
 576                                 EVP_SignInit(&ctx_tmp,md_tmp);
 577                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 578                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
 579                                 pp=(unsigned char *)Malloc(x);
 580                                 p=pp;
 581                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 582                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
 583                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 584                                 Free(pp);
 585                                 pp=NULL;
 586                                 }
 587
 588                         if (si->pkey->type == EVP_PKEY_DSA)
 589                                 ctx_tmp.digest=EVP_dss1();
 590
 591                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 592                                 (unsigned int *)&buf->length,si->pkey))
 593                                 {
 594                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 595                                 goto err;
 596                                 }
 597                         if (!ASN1_STRING_set(si->enc_digest,
 598                                 (unsigned char *)buf->data,buf->length))
 599                                 {
 600                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 601                                 goto err;
 602                                 }
 603                         }
 604                 }
 605
 606         if (!p7->detached)
 607                 {
 608                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 609                 if (btmp == NULL)
 610                         {
 611                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 612                         goto err;
 613                         }
 614                 BIO_get_mem_ptr(btmp,&buf_mem);
 615                 ASN1_OCTET_STRING_set(os,
 616                         (unsigned char *)buf_mem->data,buf_mem->length);
 617                 }
 618         if (pp != NULL) Free(pp);
 619         pp=NULL;
 620
 621         ret=1;
 622 err:
 623         if (buf != NULL) BUF_MEM_free(buf);
 624         return(ret);
 625         }
 626
 627 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 628              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 629         {
 630 /*      PKCS7_SIGNED *s; */
 631         ASN1_OCTET_STRING *os;
 632         EVP_MD_CTX mdc_tmp,*mdc;
 633         unsigned char *pp,*p;
 634         PKCS7_ISSUER_AND_SERIAL *ias;
 635         int ret=0,i;
 636         int md_type;
 637         STACK *sk;
 638         STACK_OF(X509) *cert;
 639         BIO *btmp;
 640         X509 *x509;
 641         EVP_PKEY *pkey;
 642
 643         if (PKCS7_type_is_signed(p7))
 644                 {
 645                 cert=p7->d.sign->cert;
 646                 }
 647         else if (PKCS7_type_is_signedAndEnveloped(p7))
 648                 {
 649                 cert=p7->d.signed_and_enveloped->cert;
 650                 }
 651         else
 652                 {
 653                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 654                 goto err;
 655                 }
 656         /* XXXXXXXXXXXXXXXXXXXXXXX */
 657         ias=si->issuer_and_serial;
 658
 659         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 660
 661         /* were we able to find the cert in passed to us */
 662         if (x509 == NULL)
 663                 {
 664                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 665                 goto err;
 666                 }
 667
 668         /* Lets verify */
 669         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 670         i=X509_verify_cert(ctx);
 671         if (i <= 0)
 672                 {
 673                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 674                 goto err;
 675                 }
 676         X509_STORE_CTX_cleanup(ctx);
 677
 678         /* So we like 'x509', lets check the signature. */
 679         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 680
 681         btmp=bio;
 682         for (;;)
 683                 {
 684                 if ((btmp == NULL) ||
 685                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 686                         {
 687                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 688                         goto err;
 689                         }
 690                 BIO_get_md_ctx(btmp,&mdc);
 691                 if (mdc == NULL)
 692                         {
 693                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
 694                         goto err;
 695                         }
 696                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 697                         break;
 698                 btmp=btmp->next_bio;
 699                 }
 700
 701         /* mdc is the digest ctx that we want, unless there are attributes,
 702          * in which case the digest is the signed attributes */
 703         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 704
 705         sk=si->auth_attr;
 706         if ((sk != NULL) && (sk_num(sk) != 0))
 707                 {
 708                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 709                 unsigned int md_len;
 710                 ASN1_OCTET_STRING *message_digest;
 711
 712                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 713                 message_digest=PKCS7_digest_from_attributes(sk);
 714                 if (!message_digest)
 715                         {
 716                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 717                         goto err;
 718                         }
 719                 if ((message_digest->length != (int)md_len) ||
 720                         (memcmp(message_digest->data,md_dat,md_len)))
 721                         {
 722 #if 0
 723 {
 724 int ii;
 725 for (ii=0; ii<message_digest->length; ii++)
 726         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 727 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 728 }
 729 #endif
 730                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
 731                         ret= -1;
 732                         goto err;
 733                         }
 734
 735                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 736                 /* Note: when forming the encoding of the attributes we
 737                  * shouldn't reorder them or this will break the signature.
 738                  * This is done by using the IS_SEQUENCE flag.
 739                  */
 740                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 741                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 742                 pp=(unsigned char *)Malloc(i);
 743                 p=pp;
 744                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 745                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 746                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 747
 748                 Free(pp);
 749                 }
 750
 751         os=si->enc_digest;
 752         pkey = X509_get_pubkey(x509);
 753         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 754
 755         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 756         EVP_PKEY_free(pkey);
 757         if (i <= 0)
 758                 {
 759                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
 760                 ret= -1;
 761                 goto err;
 762                 }
 763         else
 764                 ret=1;
 765 err:
 766         return(ret);
 767         }
 768
 769 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 770         {
 771         STACK *rsk;
 772         PKCS7_RECIP_INFO *ri;
 773         int i;
 774
 775         i=OBJ_obj2nid(p7->type);
 776         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 777         rsk=p7->d.signed_and_enveloped->recipientinfo;
 778         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 779         if (sk_num(rsk) <= idx) return(NULL);
 780         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
 781         return(ri->issuer_and_serial);
 782         }
 783
 784 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 785         {
 786         return(get_attribute(si->auth_attr,nid));
 787         }
 788
 789 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 790         {
 791         return(get_attribute(si->unauth_attr,nid));
 792         }
 793
 794 static ASN1_TYPE *get_attribute(STACK *sk, int nid)
 795         {
 796         int i;
 797         X509_ATTRIBUTE *xa;
 798         ASN1_OBJECT *o;
 799
 800         o=OBJ_nid2obj(nid);
 801         if (o == NULL) return(NULL);
 802         for (i=0; i<sk_num(sk); i++)
 803                 {
 804                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
 805                 if (OBJ_cmp(xa->object,o) == 0)
 806                         {
 807                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 808                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 809                         else
 810                                 return(NULL);
 811                         }
 812                 }
 813         return(NULL);
 814         }
 815
 816 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK *sk)
 817         {
 818         X509_ATTRIBUTE *attr;
 819         ASN1_TYPE *astype;
 820         int i;
 821         if (!sk || !sk_num(sk)) return NULL;
 822         /* Search the attributes for a digest */
 823         for (i = 0; i < sk_num(sk); i++)
 824                 {
 825                 attr = (X509_ATTRIBUTE *) sk_value(sk, i);
 826                 if (OBJ_obj2nid(attr->object) == NID_pkcs9_messageDigest)
 827                         {
 828                         if (!attr->set) return NULL;
 829                         if (!attr->value.set
 830                             || !sk_ASN1_TYPE_num(attr->value.set) )
 831                             return NULL;
 832                         astype = sk_ASN1_TYPE_value(attr->value.set, 0);
 833                         return astype->value.octet_string;
 834                         }
 835                 }
 836         return NULL;
 837         }
 838
 839 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
 840         {
 841         int i;
 842
 843         if (p7si->auth_attr != NULL)
 844                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 845         p7si->auth_attr=sk_dup(sk);
 846         for (i=0; i<sk_num(sk); i++)
 847                 {
 848                 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 849                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 850                         return(0);
 851                 }
 852         return(1);
 853         }
 854
 855 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
 856         {
 857         int i;
 858
 859         if (p7si->unauth_attr != NULL)
 860                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
 861         p7si->unauth_attr=sk_dup(sk);
 862         for (i=0; i<sk_num(sk); i++)
 863                 {
 864                 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 865                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 866                         return(0);
 867                 }
 868         return(1);
 869         }
 870
 871 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 872              void *value)
 873         {
 874         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 875         }
 876
 877 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 878              void *value)
 879         {
 880         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 881         }
 882
 883 static int add_attribute(STACK **sk, int nid, int atrtype, void *value)
 884         {
 885         X509_ATTRIBUTE *attr=NULL;
 886
 887         if (*sk == NULL)
 888                 {
 889                 *sk = sk_new(NULL);
 890 new_attrib:
 891                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 892                 sk_push(*sk,(char *)attr);
 893                 }
 894         else
 895                 {
 896                 int i;
 897
 898                 for (i=0; i<sk_num(*sk); i++)
 899                         {
 900                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
 901                         if (OBJ_obj2nid(attr->object) == nid)
 902                                 {
 903                                 X509_ATTRIBUTE_free(attr);
 904                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 905                                 sk_value(*sk,i)=(char *)attr;
 906                                 goto end;
 907                                 }
 908                         }
 909                 goto new_attrib;
 910                 }
 911 end:
 912         return(1);
 913         }
 914