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_OF(X509_ALGOR) *md_sk=NULL;
  77         STACK *rsk=NULL;
  78         X509_ALGOR *xalg=NULL;
  79         PKCS7_RECIP_INFO *ri=NULL;
  80         EVP_PKEY *pkey;
  81
  82         i=OBJ_obj2nid(p7->type);
  83         p7->state=PKCS7_S_HEADER;
  84
  85         switch (i)
  86                 {
  87         case NID_pkcs7_signed:
  88                 md_sk=p7->d.sign->md_algs;
  89                 break;
  90         case NID_pkcs7_signedAndEnveloped:
  91                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  92                 md_sk=p7->d.signed_and_enveloped->md_algs;
  93                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  94                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
  95                 if (evp_cipher == NULL)
  96                         {
  97                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
  98                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
  99                         goto err;
 100                         }
 101                 break;
 102         case NID_pkcs7_enveloped:
 103                 rsk=p7->d.enveloped->recipientinfo;
 104                 xalg=p7->d.enveloped->enc_data->algorithm;
 105                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 106                 if (evp_cipher == NULL)
 107                         {
 108                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 109                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 110                         goto err;
 111                         }
 112                 break;
 113         default:
 114                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 115                 goto err;
 116                 }
 117
 118         if (md_sk != NULL)
 119                 {
 120                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 121                         {
 122                         xa=sk_X509_ALGOR_value(md_sk,i);
 123                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 124                                 {
 125                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 126                                 goto err;
 127                                 }
 128
 129                         j=OBJ_obj2nid(xa->algorithm);
 130                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 131                         if (evp_md == NULL)
 132                                 {
 133                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 134                                 goto err;
 135                                 }
 136
 137                         BIO_set_md(btmp,evp_md);
 138                         if (out == NULL)
 139                                 out=btmp;
 140                         else
 141                                 BIO_push(out,btmp);
 142                         btmp=NULL;
 143                         }
 144                 }
 145
 146         if (evp_cipher != NULL)
 147                 {
 148                 unsigned char key[EVP_MAX_KEY_LENGTH];
 149                 unsigned char iv[EVP_MAX_IV_LENGTH];
 150                 int keylen,ivlen;
 151                 int jj,max;
 152                 unsigned char *tmp;
 153                 EVP_CIPHER_CTX *ctx;
 154
 155                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 156                         {
 157                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 158                         goto err;
 159                         }
 160                 BIO_get_cipher_ctx(btmp, &ctx);
 161                 keylen=EVP_CIPHER_key_length(evp_cipher);
 162                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 163                 RAND_bytes(key,keylen);
 164                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 165                 if (ivlen > 0) RAND_bytes(iv,ivlen);
 166                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
 167
 168                 if (ivlen > 0) {
 169                         if (xalg->parameter == NULL)
 170                                                 xalg->parameter=ASN1_TYPE_new();
 171                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 172                                                                        goto err;
 173                 }
 174
 175                 /* Lets do the pub key stuff :-) */
 176                 max=0;
 177                 for (i=0; i<sk_num(rsk); i++)
 178                         {
 179                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 180                         if (ri->cert == NULL)
 181                                 {
 182                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 183                                 goto err;
 184                                 }
 185                         pkey=X509_get_pubkey(ri->cert);
 186                         jj=EVP_PKEY_size(pkey);
 187                         EVP_PKEY_free(pkey);
 188                         if (max < jj) max=jj;
 189                         }
 190                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 191                         {
 192                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 193                         goto err;
 194                         }
 195                 for (i=0; i<sk_num(rsk); i++)
 196                         {
 197                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 198                         pkey=X509_get_pubkey(ri->cert);
 199                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 200                         EVP_PKEY_free(pkey);
 201                         if (jj <= 0)
 202                                 {
 203                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 204                                 Free(tmp);
 205                                 goto err;
 206                                 }
 207                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 208                         }
 209                 Free(tmp);
 210                 memset(key, 0, keylen);
 211
 212                 if (out == NULL)
 213                         out=btmp;
 214                 else
 215                         BIO_push(out,btmp);
 216                 btmp=NULL;
 217                 }
 218
 219         if (bio == NULL) /* ??????????? */
 220                 {
 221                 if (p7->detached)
 222                         bio=BIO_new(BIO_s_null());
 223                 else
 224                         {
 225                         bio=BIO_new(BIO_s_mem());
 226                         /* We need to set this so that when we have read all
 227                          * the data, the encrypt BIO, if present, will read
 228                          * EOF and encode the last few bytes */
 229                         BIO_set_mem_eof_return(bio,0);
 230
 231                         if (PKCS7_type_is_signed(p7) &&
 232                                 PKCS7_type_is_data(p7->d.sign->contents))
 233                                 {
 234                                 ASN1_OCTET_STRING *os;
 235
 236                                 os=p7->d.sign->contents->d.data;
 237                                 if (os->length > 0)
 238                                         BIO_write(bio,(char *)os->data,
 239                                                 os->length);
 240                                 }
 241                         }
 242                 }
 243         BIO_push(out,bio);
 244         bio=NULL;
 245         if (0)
 246                 {
 247 err:
 248                 if (out != NULL)
 249                         BIO_free_all(out);
 250                 if (btmp != NULL)
 251                         BIO_free_all(btmp);
 252                 out=NULL;
 253                 }
 254         return(out);
 255         }
 256
 257 /* int */
 258 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 259         {
 260         int i,j;
 261         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 262         char *tmp=NULL;
 263         X509_ALGOR *xa;
 264         ASN1_OCTET_STRING *data_body=NULL;
 265         const EVP_MD *evp_md;
 266         const EVP_CIPHER *evp_cipher=NULL;
 267         EVP_CIPHER_CTX *evp_ctx=NULL;
 268         X509_ALGOR *enc_alg=NULL;
 269         STACK_OF(X509_ALGOR) *md_sk=NULL;
 270         STACK *rsk=NULL;
 271         X509_ALGOR *xalg=NULL;
 272         PKCS7_RECIP_INFO *ri=NULL;
 273 /*      EVP_PKEY *pkey; */
 274 #if 0
 275         X509_STORE_CTX s_ctx;
 276 #endif
 277
 278         i=OBJ_obj2nid(p7->type);
 279         p7->state=PKCS7_S_HEADER;
 280
 281         switch (i)
 282                 {
 283         case NID_pkcs7_signed:
 284                 data_body=p7->d.sign->contents->d.data;
 285                 md_sk=p7->d.sign->md_algs;
 286                 break;
 287         case NID_pkcs7_signedAndEnveloped:
 288                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 289                 md_sk=p7->d.signed_and_enveloped->md_algs;
 290                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 291                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 292                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 293                 if (evp_cipher == NULL)
 294                         {
 295                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 296                         goto err;
 297                         }
 298                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 299                 break;
 300         case NID_pkcs7_enveloped:
 301                 rsk=p7->d.enveloped->recipientinfo;
 302                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 303                 data_body=p7->d.enveloped->enc_data->enc_data;
 304                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 305                 if (evp_cipher == NULL)
 306                         {
 307                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 308                         goto err;
 309                         }
 310                 xalg=p7->d.enveloped->enc_data->algorithm;
 311                 break;
 312         default:
 313                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 314                 goto err;
 315                 }
 316
 317         /* We will be checking the signature */
 318         if (md_sk != NULL)
 319                 {
 320                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 321                         {
 322                         xa=sk_X509_ALGOR_value(md_sk,i);
 323                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 324                                 {
 325                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 326                                 goto err;
 327                                 }
 328
 329                         j=OBJ_obj2nid(xa->algorithm);
 330                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 331                         if (evp_md == NULL)
 332                                 {
 333                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 334                                 goto err;
 335                                 }
 336
 337                         BIO_set_md(btmp,evp_md);
 338                         if (out == NULL)
 339                                 out=btmp;
 340                         else
 341                                 BIO_push(out,btmp);
 342                         btmp=NULL;
 343                         }
 344                 }
 345
 346         if (evp_cipher != NULL)
 347                 {
 348 #if 0
 349                 unsigned char key[EVP_MAX_KEY_LENGTH];
 350                 unsigned char iv[EVP_MAX_IV_LENGTH];
 351                 unsigned char *p;
 352                 int keylen,ivlen;
 353                 int max;
 354                 X509_OBJECT ret;
 355 #endif
 356                 int jj;
 357
 358                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 359                         {
 360                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 361                         goto err;
 362                         }
 363
 364                 /* It was encrypted, we need to decrypt the secret key
 365                  * with the private key */
 366
 367                 /* Find the recipientInfo which matches the passed certificate
 368                  * (if any)
 369                  */
 370
 371                 for (i=0; i<sk_num(rsk); i++) {
 372                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 373                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 374                                         pcert->cert_info->issuer) &&
 375                              !ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 376                                         ri->issuer_and_serial->serial)) break;
 377                         ri=NULL;
 378                 }
 379                 if (ri == NULL) {
 380                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 381                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 382                         return(NULL);
 383                 }
 384
 385                 jj=EVP_PKEY_size(pkey);
 386                 tmp=Malloc(jj+10);
 387                 if (tmp == NULL)
 388                         {
 389                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 390                         goto err;
 391                         }
 392
 393                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
 394                         ASN1_STRING_data(ri->enc_key),
 395                         ASN1_STRING_length(ri->enc_key),
 396                         pkey);
 397                 if (jj <= 0)
 398                         {
 399                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 400                         goto err;
 401                         }
 402
 403                 evp_ctx=NULL;
 404                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 405                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 406                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 407                         return(NULL);
 408
 409                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
 410                         {
 411                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 412                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 413                         goto err;
 414                         }
 415                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
 416
 417                 memset(tmp,0,jj);
 418
 419                 if (out == NULL)
 420                         out=etmp;
 421                 else
 422                         BIO_push(out,etmp);
 423                 etmp=NULL;
 424                 }
 425
 426 #if 1
 427         if (p7->detached || (in_bio != NULL))
 428                 {
 429                 bio=in_bio;
 430                 }
 431         else
 432                 {
 433                 bio=BIO_new(BIO_s_mem());
 434                 /* We need to set this so that when we have read all
 435                  * the data, the encrypt BIO, if present, will read
 436                  * EOF and encode the last few bytes */
 437                 BIO_set_mem_eof_return(bio,0);
 438
 439                 if (data_body->length > 0)
 440                         BIO_write(bio,(char *)data_body->data,data_body->length);
 441                 }
 442         BIO_push(out,bio);
 443         bio=NULL;
 444 #endif
 445         if (0)
 446                 {
 447 err:
 448                 if (out != NULL) BIO_free_all(out);
 449                 if (btmp != NULL) BIO_free_all(btmp);
 450                 if (etmp != NULL) BIO_free_all(etmp);
 451                 if (bio != NULL) BIO_free_all(bio);
 452                 out=NULL;
 453                 }
 454         if (tmp != NULL)
 455                 Free(tmp);
 456         return(out);
 457         }
 458
 459 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 460         {
 461         int ret=0;
 462         int i,j;
 463         BIO *btmp;
 464         BUF_MEM *buf_mem=NULL;
 465         BUF_MEM *buf=NULL;
 466         PKCS7_SIGNER_INFO *si;
 467         EVP_MD_CTX *mdc,ctx_tmp;
 468         STACK_OF(X509_ATTRIBUTE) *sk;
 469         STACK *si_sk=NULL;
 470         unsigned char *p,*pp=NULL;
 471         int x;
 472         ASN1_OCTET_STRING *os=NULL;
 473
 474         i=OBJ_obj2nid(p7->type);
 475         p7->state=PKCS7_S_HEADER;
 476
 477         switch (i)
 478                 {
 479         case NID_pkcs7_signedAndEnveloped:
 480                 /* XXXXXXXXXXXXXXXX */
 481                 si_sk=p7->d.signed_and_enveloped->signer_info;
 482                 os=ASN1_OCTET_STRING_new();
 483                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 484                 break;
 485         case NID_pkcs7_enveloped:
 486                 /* XXXXXXXXXXXXXXXX */
 487                 os=ASN1_OCTET_STRING_new();
 488                 p7->d.enveloped->enc_data->enc_data=os;
 489                 break;
 490         case NID_pkcs7_signed:
 491                 si_sk=p7->d.sign->signer_info;
 492                 os=p7->d.sign->contents->d.data;
 493                 /* If detached data then the content is excluded */
 494                 if(p7->detached) {
 495                         ASN1_OCTET_STRING_free(os);
 496                         p7->d.sign->contents->d.data = NULL;
 497                 }
 498                 break;
 499                 }
 500
 501         if (si_sk != NULL)
 502                 {
 503                 if ((buf=BUF_MEM_new()) == NULL)
 504                         {
 505                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 506                         goto err;
 507                         }
 508                 for (i=0; i<sk_num(si_sk); i++)
 509                         {
 510                         si=(PKCS7_SIGNER_INFO *)
 511                                 sk_value(si_sk,i);
 512                         if (si->pkey == NULL) continue;
 513
 514                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 515
 516                         btmp=bio;
 517                         for (;;)
 518                                 {
 519                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 520                                         == NULL)
 521                                         {
 522                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 523                                         goto err;
 524                                         }
 525                                 BIO_get_md_ctx(btmp,&mdc);
 526                                 if (mdc == NULL)
 527                                         {
 528                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 529                                         goto err;
 530                                         }
 531                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 532                                         break;
 533                                 else
 534                                         btmp=btmp->next_bio;
 535                                 }
 536
 537                         /* We now have the EVP_MD_CTX, lets do the
 538                          * signing. */
 539                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 540                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 541                                 {
 542                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 543                                 goto err;
 544                                 }
 545
 546                         sk=si->auth_attr;
 547
 548                         /* If there are attributes, we add the digest
 549                          * attribute and only sign the attributes */
 550                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 551                                 {
 552                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 553                                 unsigned int md_len;
 554                                 ASN1_OCTET_STRING *digest;
 555                                 ASN1_UTCTIME *sign_time;
 556                                 const EVP_MD *md_tmp;
 557
 558                                 /* Add signing time */
 559                                 sign_time=X509_gmtime_adj(NULL,0);
 560                                 PKCS7_add_signed_attribute(si,
 561                                         NID_pkcs9_signingTime,
 562                                         V_ASN1_UTCTIME,sign_time);
 563
 564                                 /* Add digest */
 565                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 566                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 567                                 digest=ASN1_OCTET_STRING_new();
 568                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
 569                                 PKCS7_add_signed_attribute(si,
 570                                         NID_pkcs9_messageDigest,
 571                                         V_ASN1_OCTET_STRING,digest);
 572
 573                                 /* Now sign the mess */
 574                                 EVP_SignInit(&ctx_tmp,md_tmp);
 575                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
 576                                            i2d_X509_ATTRIBUTE,
 577                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 578                                 pp=(unsigned char *)Malloc(x);
 579                                 p=pp;
 580                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
 581                                            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_OF(X509_ATTRIBUTE) *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_X509_ATTRIBUTE_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_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
 741                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 742                 pp=Malloc(i);
 743                 p=pp;
 744                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(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_OF(X509_ATTRIBUTE) *sk, int nid)
 795         {
 796         int i;
 797         X509_ATTRIBUTE *xa;
 798         ASN1_OBJECT *o;
 799
 800         o=OBJ_nid2obj(nid);
 801         if (!o || !sk) return(NULL);
 802         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 803                 {
 804                 xa=sk_X509_ATTRIBUTE_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_OF(X509_ATTRIBUTE) *sk)
 817 {
 818         ASN1_TYPE *astype;
 819         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 820         return astype->value.octet_string;
 821 }
 822
 823 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 824                                 STACK_OF(X509_ATTRIBUTE) *sk)
 825         {
 826         int i;
 827
 828         if (p7si->auth_attr != NULL)
 829                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 830         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 831         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 832                 {
 833                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 834                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 835                     == NULL)
 836                         return(0);
 837                 }
 838         return(1);
 839         }
 840
 841 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 842         {
 843         int i;
 844
 845         if (p7si->unauth_attr != NULL)
 846                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 847                                            X509_ATTRIBUTE_free);
 848         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 849         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 850                 {
 851                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 852                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 853                     == NULL)
 854                         return(0);
 855                 }
 856         return(1);
 857         }
 858
 859 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 860              void *value)
 861         {
 862         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 863         }
 864
 865 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 866              void *value)
 867         {
 868         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 869         }
 870
 871 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 872                          void *value)
 873         {
 874         X509_ATTRIBUTE *attr=NULL;
 875
 876         if (*sk == NULL)
 877                 {
 878                 *sk = sk_X509_ATTRIBUTE_new(NULL);
 879 new_attrib:
 880                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 881                 sk_X509_ATTRIBUTE_push(*sk,attr);
 882                 }
 883         else
 884                 {
 885                 int i;
 886
 887                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 888                         {
 889                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 890                         if (OBJ_obj2nid(attr->object) == nid)
 891                                 {
 892                                 X509_ATTRIBUTE_free(attr);
 893                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 894                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 895                                 goto end;
 896                                 }
 897                         }
 898                 goto new_attrib;
 899                 }
 900 end:
 901         return(1);
 902         }
 903