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_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
  66                          void *value);
  67 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
  68
  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                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  93                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
  94                 if (evp_cipher == NULL)
  95                         {
  96                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
  97                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
  98                         goto err;
  99                         }
 100                 break;
 101         case NID_pkcs7_enveloped:
 102                 rsk=p7->d.enveloped->recipientinfo;
 103                 xalg=p7->d.enveloped->enc_data->algorithm;
 104                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 105                 if (evp_cipher == NULL)
 106                         {
 107                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 108                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 109                         goto err;
 110                         }
 111                 break;
 112         default:
 113                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 114                 goto err;
 115                 }
 116
 117         if (md_sk != NULL)
 118                 {
 119                 for (i=0; i<sk_num(md_sk); i++)
 120                         {
 121                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 122                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 123                                 {
 124                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 125                                 goto err;
 126                                 }
 127
 128                         j=OBJ_obj2nid(xa->algorithm);
 129                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 130                         if (evp_md == NULL)
 131                                 {
 132                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 133                                 goto err;
 134                                 }
 135
 136                         BIO_set_md(btmp,evp_md);
 137                         if (out == NULL)
 138                                 out=btmp;
 139                         else
 140                                 BIO_push(out,btmp);
 141                         btmp=NULL;
 142                         }
 143                 }
 144
 145         if (evp_cipher != NULL)
 146                 {
 147                 unsigned char key[EVP_MAX_KEY_LENGTH];
 148                 unsigned char iv[EVP_MAX_IV_LENGTH];
 149                 int keylen,ivlen;
 150                 int jj,max;
 151                 unsigned char *tmp;
 152                 EVP_CIPHER_CTX *ctx;
 153
 154                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 155                         {
 156                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 157                         goto err;
 158                         }
 159                 BIO_get_cipher_ctx(btmp, &ctx);
 160                 keylen=EVP_CIPHER_key_length(evp_cipher);
 161                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 162                 RAND_bytes(key,keylen);
 163                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 164                 if (ivlen > 0) RAND_bytes(iv,ivlen);
 165                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
 166
 167                 if (ivlen > 0) {
 168                         if (xalg->parameter == NULL)
 169                                                 xalg->parameter=ASN1_TYPE_new();
 170                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 171                                                                        goto err;
 172                 }
 173
 174                 /* Lets do the pub key stuff :-) */
 175                 max=0;
 176                 for (i=0; i<sk_num(rsk); i++)
 177                         {
 178                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 179                         if (ri->cert == NULL)
 180                                 {
 181                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 182                                 goto err;
 183                                 }
 184                         pkey=X509_get_pubkey(ri->cert);
 185                         jj=EVP_PKEY_size(pkey);
 186                         EVP_PKEY_free(pkey);
 187                         if (max < jj) max=jj;
 188                         }
 189                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 190                         {
 191                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 192                         goto err;
 193                         }
 194                 for (i=0; i<sk_num(rsk); i++)
 195                         {
 196                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 197                         pkey=X509_get_pubkey(ri->cert);
 198                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 199                         EVP_PKEY_free(pkey);
 200                         if (jj <= 0)
 201                                 {
 202                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 203                                 Free(tmp);
 204                                 goto err;
 205                                 }
 206                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 207                         }
 208                 Free(tmp);
 209                 memset(key, 0, keylen);
 210
 211                 if (out == NULL)
 212                         out=btmp;
 213                 else
 214                         BIO_push(out,btmp);
 215                 btmp=NULL;
 216                 }
 217
 218         if (bio == NULL) /* ??????????? */
 219                 {
 220                 if (p7->detached)
 221                         bio=BIO_new(BIO_s_null());
 222                 else
 223                         {
 224                         bio=BIO_new(BIO_s_mem());
 225                         /* We need to set this so that when we have read all
 226                          * the data, the encrypt BIO, if present, will read
 227                          * EOF and encode the last few bytes */
 228                         BIO_set_mem_eof_return(bio,0);
 229
 230                         if (PKCS7_type_is_signed(p7) &&
 231                                 PKCS7_type_is_data(p7->d.sign->contents))
 232                                 {
 233                                 ASN1_OCTET_STRING *os;
 234
 235                                 os=p7->d.sign->contents->d.data;
 236                                 if (os->length > 0)
 237                                         BIO_write(bio,(char *)os->data,
 238                                                 os->length);
 239                                 }
 240                         }
 241                 }
 242         BIO_push(out,bio);
 243         bio=NULL;
 244         if (0)
 245                 {
 246 err:
 247                 if (out != NULL)
 248                         BIO_free_all(out);
 249                 if (btmp != NULL)
 250                         BIO_free_all(btmp);
 251                 out=NULL;
 252                 }
 253         return(out);
 254         }
 255
 256 /* int */
 257 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 258         {
 259         int i,j;
 260         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 261         char *tmp=NULL;
 262         X509_ALGOR *xa;
 263         ASN1_OCTET_STRING *data_body=NULL;
 264         const EVP_MD *evp_md;
 265         const EVP_CIPHER *evp_cipher=NULL;
 266         EVP_CIPHER_CTX *evp_ctx=NULL;
 267         X509_ALGOR *enc_alg=NULL;
 268         STACK *md_sk=NULL,*rsk=NULL;
 269         X509_ALGOR *xalg=NULL;
 270         PKCS7_RECIP_INFO *ri=NULL;
 271 /*      EVP_PKEY *pkey; */
 272 #if 0
 273         X509_STORE_CTX s_ctx;
 274 #endif
 275
 276         i=OBJ_obj2nid(p7->type);
 277         p7->state=PKCS7_S_HEADER;
 278
 279         switch (i)
 280                 {
 281         case NID_pkcs7_signed:
 282                 data_body=p7->d.sign->contents->d.data;
 283                 md_sk=p7->d.sign->md_algs;
 284                 break;
 285         case NID_pkcs7_signedAndEnveloped:
 286                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 287                 md_sk=p7->d.signed_and_enveloped->md_algs;
 288                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 289                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 290                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 291                 if (evp_cipher == NULL)
 292                         {
 293                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 294                         goto err;
 295                         }
 296                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 297                 break;
 298         case NID_pkcs7_enveloped:
 299                 rsk=p7->d.enveloped->recipientinfo;
 300                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 301                 data_body=p7->d.enveloped->enc_data->enc_data;
 302                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 303                 if (evp_cipher == NULL)
 304                         {
 305                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 306                         goto err;
 307                         }
 308                 xalg=p7->d.enveloped->enc_data->algorithm;
 309                 break;
 310         default:
 311                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 312                 goto err;
 313                 }
 314
 315         /* We will be checking the signature */
 316         if (md_sk != NULL)
 317                 {
 318                 for (i=0; i<sk_num(md_sk); i++)
 319                         {
 320                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 321                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 322                                 {
 323                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 324                                 goto err;
 325                                 }
 326
 327                         j=OBJ_obj2nid(xa->algorithm);
 328                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 329                         if (evp_md == NULL)
 330                                 {
 331                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 332                                 goto err;
 333                                 }
 334
 335                         BIO_set_md(btmp,evp_md);
 336                         if (out == NULL)
 337                                 out=btmp;
 338                         else
 339                                 BIO_push(out,btmp);
 340                         btmp=NULL;
 341                         }
 342                 }
 343
 344         if (evp_cipher != NULL)
 345                 {
 346 #if 0
 347                 unsigned char key[EVP_MAX_KEY_LENGTH];
 348                 unsigned char iv[EVP_MAX_IV_LENGTH];
 349                 unsigned char *p;
 350                 int keylen,ivlen;
 351                 int max;
 352                 X509_OBJECT ret;
 353 #endif
 354                 int jj;
 355
 356                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 357                         {
 358                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 359                         goto err;
 360                         }
 361
 362                 /* It was encrypted, we need to decrypt the secret key
 363                  * with the private key */
 364
 365                 /* Find the recipientInfo which matches the passed certificate
 366                  * (if any)
 367                  */
 368
 369                 for (i=0; i<sk_num(rsk); i++) {
 370                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 371                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 372                                         pcert->cert_info->issuer) &&
 373                              !ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 374                                         ri->issuer_and_serial->serial)) break;
 375                         ri=NULL;
 376                 }
 377                 if (ri == NULL) {
 378                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 379                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 380                         return(NULL);
 381                 }
 382
 383                 jj=EVP_PKEY_size(pkey);
 384                 tmp=Malloc(jj+10);
 385                 if (tmp == NULL)
 386                         {
 387                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 388                         goto err;
 389                         }
 390
 391                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
 392                         ASN1_STRING_data(ri->enc_key),
 393                         ASN1_STRING_length(ri->enc_key),
 394                         pkey);
 395                 if (jj <= 0)
 396                         {
 397                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 398                         goto err;
 399                         }
 400
 401                 evp_ctx=NULL;
 402                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 403                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 404                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 405                         return(NULL);
 406
 407                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
 408                         {
 409                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 410                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 411                         goto err;
 412                         }
 413                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
 414
 415                 memset(tmp,0,jj);
 416
 417                 if (out == NULL)
 418                         out=etmp;
 419                 else
 420                         BIO_push(out,etmp);
 421                 etmp=NULL;
 422                 }
 423
 424 #if 1
 425         if (p7->detached || (in_bio != NULL))
 426                 {
 427                 bio=in_bio;
 428                 }
 429         else
 430                 {
 431                 bio=BIO_new(BIO_s_mem());
 432                 /* We need to set this so that when we have read all
 433                  * the data, the encrypt BIO, if present, will read
 434                  * EOF and encode the last few bytes */
 435                 BIO_set_mem_eof_return(bio,0);
 436
 437                 if (data_body->length > 0)
 438                         BIO_write(bio,(char *)data_body->data,data_body->length);
 439                 }
 440         BIO_push(out,bio);
 441         bio=NULL;
 442 #endif
 443         if (0)
 444                 {
 445 err:
 446                 if (out != NULL) BIO_free_all(out);
 447                 if (btmp != NULL) BIO_free_all(btmp);
 448                 if (etmp != NULL) BIO_free_all(etmp);
 449                 if (bio != NULL) BIO_free_all(bio);
 450                 out=NULL;
 451                 }
 452         if (tmp != NULL)
 453                 Free(tmp);
 454         return(out);
 455         }
 456
 457 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 458         {
 459         int ret=0;
 460         int i,j;
 461         BIO *btmp;
 462         BUF_MEM *buf_mem=NULL;
 463         BUF_MEM *buf=NULL;
 464         PKCS7_SIGNER_INFO *si;
 465         EVP_MD_CTX *mdc,ctx_tmp;
 466         STACK_OF(X509_ATTRIBUTE) *sk;
 467         STACK *si_sk=NULL;
 468         unsigned char *p,*pp=NULL;
 469         int x;
 470         ASN1_OCTET_STRING *os=NULL;
 471
 472         i=OBJ_obj2nid(p7->type);
 473         p7->state=PKCS7_S_HEADER;
 474
 475         switch (i)
 476                 {
 477         case NID_pkcs7_signedAndEnveloped:
 478                 /* XXXXXXXXXXXXXXXX */
 479                 si_sk=p7->d.signed_and_enveloped->signer_info;
 480                 os=ASN1_OCTET_STRING_new();
 481                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 482                 break;
 483         case NID_pkcs7_enveloped:
 484                 /* XXXXXXXXXXXXXXXX */
 485                 os=ASN1_OCTET_STRING_new();
 486                 p7->d.enveloped->enc_data->enc_data=os;
 487                 break;
 488         case NID_pkcs7_signed:
 489                 si_sk=p7->d.sign->signer_info;
 490                 os=p7->d.sign->contents->d.data;
 491                 /* If detached data then the content is excluded */
 492                 if(p7->detached) {
 493                         ASN1_OCTET_STRING_free(os);
 494                         p7->d.sign->contents->d.data = NULL;
 495                 }
 496                 break;
 497                 }
 498
 499         if (si_sk != NULL)
 500                 {
 501                 if ((buf=BUF_MEM_new()) == NULL)
 502                         {
 503                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 504                         goto err;
 505                         }
 506                 for (i=0; i<sk_num(si_sk); i++)
 507                         {
 508                         si=(PKCS7_SIGNER_INFO *)
 509                                 sk_value(si_sk,i);
 510                         if (si->pkey == NULL) continue;
 511
 512                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 513
 514                         btmp=bio;
 515                         for (;;)
 516                                 {
 517                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 518                                         == NULL)
 519                                         {
 520                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 521                                         goto err;
 522                                         }
 523                                 BIO_get_md_ctx(btmp,&mdc);
 524                                 if (mdc == NULL)
 525                                         {
 526                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 527                                         goto err;
 528                                         }
 529                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 530                                         break;
 531                                 else
 532                                         btmp=btmp->next_bio;
 533                                 }
 534
 535                         /* We now have the EVP_MD_CTX, lets do the
 536                          * signing. */
 537                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 538                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 539                                 {
 540                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 541                                 goto err;
 542                                 }
 543
 544                         sk=si->auth_attr;
 545
 546                         /* If there are attributes, we add the digest
 547                          * attribute and only sign the attributes */
 548                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 549                                 {
 550                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 551                                 unsigned int md_len;
 552                                 ASN1_OCTET_STRING *digest;
 553                                 ASN1_UTCTIME *sign_time;
 554                                 const EVP_MD *md_tmp;
 555
 556                                 /* Add signing time */
 557                                 sign_time=X509_gmtime_adj(NULL,0);
 558                                 PKCS7_add_signed_attribute(si,
 559                                         NID_pkcs9_signingTime,
 560                                         V_ASN1_UTCTIME,sign_time);
 561
 562                                 /* Add digest */
 563                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 564                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 565                                 digest=ASN1_OCTET_STRING_new();
 566                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
 567                                 PKCS7_add_signed_attribute(si,
 568                                         NID_pkcs9_messageDigest,
 569                                         V_ASN1_OCTET_STRING,digest);
 570
 571                                 /* Now sign the mess */
 572                                 EVP_SignInit(&ctx_tmp,md_tmp);
 573                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
 574                                            i2d_X509_ATTRIBUTE,
 575                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 576                                 pp=(unsigned char *)Malloc(x);
 577                                 p=pp;
 578                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
 579                                            i2d_X509_ATTRIBUTE,
 580                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 581                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 582                                 Free(pp);
 583                                 pp=NULL;
 584                                 }
 585
 586                         if (si->pkey->type == EVP_PKEY_DSA)
 587                                 ctx_tmp.digest=EVP_dss1();
 588
 589                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 590                                 (unsigned int *)&buf->length,si->pkey))
 591                                 {
 592                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 593                                 goto err;
 594                                 }
 595                         if (!ASN1_STRING_set(si->enc_digest,
 596                                 (unsigned char *)buf->data,buf->length))
 597                                 {
 598                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 599                                 goto err;
 600                                 }
 601                         }
 602                 }
 603
 604         if (!p7->detached)
 605                 {
 606                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 607                 if (btmp == NULL)
 608                         {
 609                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 610                         goto err;
 611                         }
 612                 BIO_get_mem_ptr(btmp,&buf_mem);
 613                 ASN1_OCTET_STRING_set(os,
 614                         (unsigned char *)buf_mem->data,buf_mem->length);
 615                 }
 616         if (pp != NULL) Free(pp);
 617         pp=NULL;
 618
 619         ret=1;
 620 err:
 621         if (buf != NULL) BUF_MEM_free(buf);
 622         return(ret);
 623         }
 624
 625 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 626              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 627         {
 628 /*      PKCS7_SIGNED *s; */
 629         ASN1_OCTET_STRING *os;
 630         EVP_MD_CTX mdc_tmp,*mdc;
 631         unsigned char *pp,*p;
 632         PKCS7_ISSUER_AND_SERIAL *ias;
 633         int ret=0,i;
 634         int md_type;
 635         STACK_OF(X509_ATTRIBUTE) *sk;
 636         STACK_OF(X509) *cert;
 637         BIO *btmp;
 638         X509 *x509;
 639         EVP_PKEY *pkey;
 640
 641         if (PKCS7_type_is_signed(p7))
 642                 {
 643                 cert=p7->d.sign->cert;
 644                 }
 645         else if (PKCS7_type_is_signedAndEnveloped(p7))
 646                 {
 647                 cert=p7->d.signed_and_enveloped->cert;
 648                 }
 649         else
 650                 {
 651                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 652                 goto err;
 653                 }
 654         /* XXXXXXXXXXXXXXXXXXXXXXX */
 655         ias=si->issuer_and_serial;
 656
 657         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 658
 659         /* were we able to find the cert in passed to us */
 660         if (x509 == NULL)
 661                 {
 662                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 663                 goto err;
 664                 }
 665
 666         /* Lets verify */
 667         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 668         i=X509_verify_cert(ctx);
 669         if (i <= 0)
 670                 {
 671                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 672                 goto err;
 673                 }
 674         X509_STORE_CTX_cleanup(ctx);
 675
 676         /* So we like 'x509', lets check the signature. */
 677         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 678
 679         btmp=bio;
 680         for (;;)
 681                 {
 682                 if ((btmp == NULL) ||
 683                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 684                         {
 685                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 686                         goto err;
 687                         }
 688                 BIO_get_md_ctx(btmp,&mdc);
 689                 if (mdc == NULL)
 690                         {
 691                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
 692                         goto err;
 693                         }
 694                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 695                         break;
 696                 btmp=btmp->next_bio;
 697                 }
 698
 699         /* mdc is the digest ctx that we want, unless there are attributes,
 700          * in which case the digest is the signed attributes */
 701         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 702
 703         sk=si->auth_attr;
 704         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 705                 {
 706                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 707                 unsigned int md_len;
 708                 ASN1_OCTET_STRING *message_digest;
 709
 710                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 711                 message_digest=PKCS7_digest_from_attributes(sk);
 712                 if (!message_digest)
 713                         {
 714                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 715                         goto err;
 716                         }
 717                 if ((message_digest->length != (int)md_len) ||
 718                         (memcmp(message_digest->data,md_dat,md_len)))
 719                         {
 720 #if 0
 721 {
 722 int ii;
 723 for (ii=0; ii<message_digest->length; ii++)
 724         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 725 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 726 }
 727 #endif
 728                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
 729                         ret= -1;
 730                         goto err;
 731                         }
 732
 733                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 734                 /* Note: when forming the encoding of the attributes we
 735                  * shouldn't reorder them or this will break the signature.
 736                  * This is done by using the IS_SEQUENCE flag.
 737                  */
 738                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
 739                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 740                 pp=Malloc(i);
 741                 p=pp;
 742                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
 743                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 744                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 745
 746                 Free(pp);
 747                 }
 748
 749         os=si->enc_digest;
 750         pkey = X509_get_pubkey(x509);
 751         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 752
 753         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 754         EVP_PKEY_free(pkey);
 755         if (i <= 0)
 756                 {
 757                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
 758                 ret= -1;
 759                 goto err;
 760                 }
 761         else
 762                 ret=1;
 763 err:
 764         return(ret);
 765         }
 766
 767 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 768         {
 769         STACK *rsk;
 770         PKCS7_RECIP_INFO *ri;
 771         int i;
 772
 773         i=OBJ_obj2nid(p7->type);
 774         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 775         rsk=p7->d.signed_and_enveloped->recipientinfo;
 776         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 777         if (sk_num(rsk) <= idx) return(NULL);
 778         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
 779         return(ri->issuer_and_serial);
 780         }
 781
 782 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 783         {
 784         return(get_attribute(si->auth_attr,nid));
 785         }
 786
 787 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 788         {
 789         return(get_attribute(si->unauth_attr,nid));
 790         }
 791
 792 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 793         {
 794         int i;
 795         X509_ATTRIBUTE *xa;
 796         ASN1_OBJECT *o;
 797
 798         o=OBJ_nid2obj(nid);
 799         if (!o || !sk) return(NULL);
 800         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 801                 {
 802                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 803                 if (OBJ_cmp(xa->object,o) == 0)
 804                         {
 805                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 806                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 807                         else
 808                                 return(NULL);
 809                         }
 810                 }
 811         return(NULL);
 812         }
 813
 814 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 815 {
 816         ASN1_TYPE *astype;
 817         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 818         return astype->value.octet_string;
 819 }
 820
 821 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 822                                 STACK_OF(X509_ATTRIBUTE) *sk)
 823         {
 824         int i;
 825
 826         if (p7si->auth_attr != NULL)
 827                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 828         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 829         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 830                 {
 831                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 832                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 833                     == NULL)
 834                         return(0);
 835                 }
 836         return(1);
 837         }
 838
 839 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 840         {
 841         int i;
 842
 843         if (p7si->unauth_attr != NULL)
 844                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 845                                            X509_ATTRIBUTE_free);
 846         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 847         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 848                 {
 849                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 850                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 851                     == NULL)
 852                         return(0);
 853                 }
 854         return(1);
 855         }
 856
 857 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 858              void *value)
 859         {
 860         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 861         }
 862
 863 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 864              void *value)
 865         {
 866         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 867         }
 868
 869 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 870                          void *value)
 871         {
 872         X509_ATTRIBUTE *attr=NULL;
 873
 874         if (*sk == NULL)
 875                 {
 876                 *sk = sk_X509_ATTRIBUTE_new(NULL);
 877 new_attrib:
 878                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 879                 sk_X509_ATTRIBUTE_push(*sk,attr);
 880                 }
 881         else
 882                 {
 883                 int i;
 884
 885                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 886                         {
 887                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 888                         if (OBJ_obj2nid(attr->object) == nid)
 889                                 {
 890                                 X509_ATTRIBUTE_free(attr);
 891                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 892                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 893                                 goto end;
 894                                 }
 895                         }
 896                 goto new_attrib;
 897                 }
 898 end:
 899         return(1);
 900         }
 901