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 #include <openssl/x509v3.h>
  65 #include <openssl/err.h>
  66
  67 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
  68                          void *value);
  69 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
  70
  71 static int PKCS7_type_is_other(PKCS7* p7)
  72         {
  73         int isOther=1;
  74
  75         int nid=OBJ_obj2nid(p7->type);
  76
  77         switch( nid )
  78                 {
  79         case NID_pkcs7_data:
  80         case NID_pkcs7_signed:
  81         case NID_pkcs7_enveloped:
  82         case NID_pkcs7_signedAndEnveloped:
  83         case NID_pkcs7_digest:
  84         case NID_pkcs7_encrypted:
  85                 isOther=0;
  86                 break;
  87         default:
  88                 isOther=1;
  89                 }
  90
  91         return isOther;
  92
  93         }
  94
  95 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
  96         {
  97         if ( PKCS7_type_is_data(p7))
  98                 return p7->d.data;
  99         if ( PKCS7_type_is_other(p7) && p7->d.other
 100                 && (p7->d.other->type == V_ASN1_OCTET_STRING))
 101                 return p7->d.other->value.octet_string;
 102         return NULL;
 103         }
 104
 105 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
 106         {
 107         BIO *btmp;
 108         const EVP_MD *md;
 109         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 110                 {
 111                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 112                 goto err;
 113                 }
 114
 115         md=EVP_get_digestbyobj(alg->algorithm);
 116         if (md == NULL)
 117                 {
 118                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 119                 goto err;
 120                 }
 121
 122         BIO_set_md(btmp,md);
 123         if (*pbio == NULL)
 124                 *pbio=btmp;
 125         else if (!BIO_push(*pbio,btmp))
 126                 {
 127                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 128                 goto err;
 129                 }
 130         btmp=NULL;
 131
 132         return 1;
 133
 134         err:
 135         if (btmp)
 136                 BIO_free(btmp);
 137         return 0;
 138
 139         }
 140
 141 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
 142                                         unsigned char *key, int keylen)
 143         {
 144         EVP_PKEY_CTX *pctx = NULL;
 145         EVP_PKEY *pkey = NULL;
 146         unsigned char *ek = NULL;
 147         int ret = 0;
 148         size_t eklen;
 149
 150         pkey = X509_get_pubkey(ri->cert);
 151
 152         if (!pkey)
 153                 return 0;
 154
 155         pctx = EVP_PKEY_CTX_new(pkey, NULL);
 156         if (!pctx)
 157                 return 0;
 158
 159         if (EVP_PKEY_encrypt_init(pctx) <= 0)
 160                 goto err;
 161
 162         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
 163                                 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0)
 164                 {
 165                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
 166                 goto err;
 167                 }
 168
 169         if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
 170                 goto err;
 171
 172         ek = OPENSSL_malloc(eklen);
 173
 174         if (ek == NULL)
 175                 {
 176                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
 177                 goto err;
 178                 }
 179
 180         if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
 181                 goto err;
 182
 183         ASN1_STRING_set0(ri->enc_key, ek, eklen);
 184         ek = NULL;
 185
 186         ret = 1;
 187
 188         err:
 189         if (pkey)
 190                 EVP_PKEY_free(pkey);
 191         if (pctx)
 192                 EVP_PKEY_CTX_free(pctx);
 193         if (ek)
 194                 OPENSSL_free(ek);
 195         return ret;
 196
 197         }
 198
 199
 200 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
 201                                PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
 202         {
 203         EVP_PKEY_CTX *pctx = NULL;
 204         unsigned char *ek = NULL;
 205         size_t eklen;
 206
 207         int ret = -1;
 208
 209         pctx = EVP_PKEY_CTX_new(pkey, NULL);
 210         if (!pctx)
 211                 return -1;
 212
 213         if (EVP_PKEY_decrypt_init(pctx) <= 0)
 214                 goto err;
 215
 216         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
 217                                 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0)
 218                 {
 219                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
 220                 goto err;
 221                 }
 222
 223         if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
 224                                 ri->enc_key->data, ri->enc_key->length) <= 0)
 225                 goto err;
 226
 227         ek = OPENSSL_malloc(eklen);
 228
 229         if (ek == NULL)
 230                 {
 231                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
 232                 goto err;
 233                 }
 234
 235         if (EVP_PKEY_decrypt(pctx, ek, &eklen,
 236                                 ri->enc_key->data, ri->enc_key->length) <= 0)
 237                 {
 238                 ret = 0;
 239                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
 240                 goto err;
 241                 }
 242
 243         ret = 1;
 244
 245         if (*pek)
 246                 {
 247                 OPENSSL_cleanse(*pek, *peklen);
 248                 OPENSSL_free(*pek);
 249                 }
 250
 251         *pek = ek;
 252         *peklen = eklen;
 253
 254         err:
 255         if (pctx)
 256                 EVP_PKEY_CTX_free(pctx);
 257         if (!ret && ek)
 258                 OPENSSL_free(ek);
 259
 260         return ret;
 261         }
 262
 263 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 264         {
 265         int i;
 266         BIO *out=NULL,*btmp=NULL;
 267         X509_ALGOR *xa = NULL;
 268         const EVP_CIPHER *evp_cipher=NULL;
 269         STACK_OF(X509_ALGOR) *md_sk=NULL;
 270         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 271         X509_ALGOR *xalg=NULL;
 272         PKCS7_RECIP_INFO *ri=NULL;
 273         ASN1_OCTET_STRING *os=NULL;
 274
 275         i=OBJ_obj2nid(p7->type);
 276         p7->state=PKCS7_S_HEADER;
 277
 278         switch (i)
 279                 {
 280         case NID_pkcs7_signed:
 281                 md_sk=p7->d.sign->md_algs;
 282                 os = PKCS7_get_octet_string(p7->d.sign->contents);
 283                 break;
 284         case NID_pkcs7_signedAndEnveloped:
 285                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 286                 md_sk=p7->d.signed_and_enveloped->md_algs;
 287                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 288                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 289                 if (evp_cipher == NULL)
 290                         {
 291                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 292                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 293                         goto err;
 294                         }
 295                 break;
 296         case NID_pkcs7_enveloped:
 297                 rsk=p7->d.enveloped->recipientinfo;
 298                 xalg=p7->d.enveloped->enc_data->algorithm;
 299                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 300                 if (evp_cipher == NULL)
 301                         {
 302                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 303                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 304                         goto err;
 305                         }
 306                 break;
 307         case NID_pkcs7_digest:
 308                 xa = p7->d.digest->md;
 309                 os = PKCS7_get_octet_string(p7->d.digest->contents);
 310                 break;
 311         case NID_pkcs7_data:
 312                 break;
 313         default:
 314                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 315                 goto err;
 316                 }
 317
 318         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 319                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 320                         goto err;
 321
 322         if (xa && !PKCS7_bio_add_digest(&out, xa))
 323                         goto err;
 324
 325         if (evp_cipher != NULL)
 326                 {
 327                 unsigned char key[EVP_MAX_KEY_LENGTH];
 328                 unsigned char iv[EVP_MAX_IV_LENGTH];
 329                 int keylen,ivlen;
 330                 EVP_CIPHER_CTX *ctx;
 331
 332                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 333                         {
 334                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 335                         goto err;
 336                         }
 337                 BIO_get_cipher_ctx(btmp, &ctx);
 338                 keylen=EVP_CIPHER_key_length(evp_cipher);
 339                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 340                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 341                 if (ivlen > 0)
 342                         if (RAND_pseudo_bytes(iv,ivlen) <= 0)
 343                                 goto err;
 344                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
 345                         goto err;
 346                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 347                         goto err;
 348                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 349                         goto err;
 350
 351                 if (ivlen > 0) {
 352                         if (xalg->parameter == NULL) {
 353                                 xalg->parameter = ASN1_TYPE_new();
 354                                 if (xalg->parameter == NULL)
 355                                         goto err;
 356                         }
 357                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 358                                 goto err;
 359                 }
 360
 361                 /* Lets do the pub key stuff :-) */
 362                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 363                         {
 364                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 365                         if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
 366                                 goto err;
 367                         }
 368                 OPENSSL_cleanse(key, keylen);
 369
 370                 if (out == NULL)
 371                         out=btmp;
 372                 else
 373                         BIO_push(out,btmp);
 374                 btmp=NULL;
 375                 }
 376
 377         if (bio == NULL)
 378                 {
 379                 if (PKCS7_is_detached(p7))
 380                         bio=BIO_new(BIO_s_null());
 381                 else if (os && os->length > 0)
 382                         bio = BIO_new_mem_buf(os->data, os->length);
 383                 if(bio == NULL)
 384                         {
 385                         bio=BIO_new(BIO_s_mem());
 386                         if (bio == NULL)
 387                                 goto err;
 388                         BIO_set_mem_eof_return(bio,0);
 389                         }
 390                 }
 391         if (out)
 392                 BIO_push(out,bio);
 393         else
 394                 out = bio;
 395         bio=NULL;
 396         if (0)
 397                 {
 398 err:
 399                 if (out != NULL)
 400                         BIO_free_all(out);
 401                 if (btmp != NULL)
 402                         BIO_free_all(btmp);
 403                 out=NULL;
 404                 }
 405         return(out);
 406         }
 407
 408 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
 409         {
 410         int ret;
 411         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
 412                                 pcert->cert_info->issuer);
 413         if (ret)
 414                 return ret;
 415         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 416                                         ri->issuer_and_serial->serial);
 417         }
 418
 419 /* int */
 420 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 421         {
 422         int i,j;
 423         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 424         X509_ALGOR *xa;
 425         ASN1_OCTET_STRING *data_body=NULL;
 426         const EVP_MD *evp_md;
 427         const EVP_CIPHER *evp_cipher=NULL;
 428         EVP_CIPHER_CTX *evp_ctx=NULL;
 429         X509_ALGOR *enc_alg=NULL;
 430         STACK_OF(X509_ALGOR) *md_sk=NULL;
 431         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 432         PKCS7_RECIP_INFO *ri=NULL;
 433        unsigned char *ek = NULL, *tkey = NULL;
 434        int eklen = 0, tkeylen = 0;
 435
 436         i=OBJ_obj2nid(p7->type);
 437         p7->state=PKCS7_S_HEADER;
 438
 439         switch (i)
 440                 {
 441         case NID_pkcs7_signed:
 442                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 443                 md_sk=p7->d.sign->md_algs;
 444                 break;
 445         case NID_pkcs7_signedAndEnveloped:
 446                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 447                 md_sk=p7->d.signed_and_enveloped->md_algs;
 448                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 449                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 450                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 451                 if (evp_cipher == NULL)
 452                         {
 453                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 454                         goto err;
 455                         }
 456                 break;
 457         case NID_pkcs7_enveloped:
 458                 rsk=p7->d.enveloped->recipientinfo;
 459                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 460                 data_body=p7->d.enveloped->enc_data->enc_data;
 461                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 462                 if (evp_cipher == NULL)
 463                         {
 464                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 465                         goto err;
 466                         }
 467                 break;
 468         default:
 469                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 470                 goto err;
 471                 }
 472
 473         /* We will be checking the signature */
 474         if (md_sk != NULL)
 475                 {
 476                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 477                         {
 478                         xa=sk_X509_ALGOR_value(md_sk,i);
 479                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 480                                 {
 481                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 482                                 goto err;
 483                                 }
 484
 485                         j=OBJ_obj2nid(xa->algorithm);
 486                         evp_md=EVP_get_digestbynid(j);
 487                         if (evp_md == NULL)
 488                                 {
 489                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 490                                 goto err;
 491                                 }
 492
 493                         BIO_set_md(btmp,evp_md);
 494                         if (out == NULL)
 495                                 out=btmp;
 496                         else
 497                                 BIO_push(out,btmp);
 498                         btmp=NULL;
 499                         }
 500                 }
 501
 502         if (evp_cipher != NULL)
 503                 {
 504 #if 0
 505                 unsigned char key[EVP_MAX_KEY_LENGTH];
 506                 unsigned char iv[EVP_MAX_IV_LENGTH];
 507                 unsigned char *p;
 508                 int keylen,ivlen;
 509                 int max;
 510                 X509_OBJECT ret;
 511 #endif
 512
 513                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 514                         {
 515                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 516                         goto err;
 517                         }
 518
 519                 /* It was encrypted, we need to decrypt the secret key
 520                  * with the private key */
 521
 522                 /* Find the recipientInfo which matches the passed certificate
 523                  * (if any)
 524                  */
 525
 526                 if (pcert)
 527                         {
 528                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 529                                 {
 530                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 531                                 if (!pkcs7_cmp_ri(ri, pcert))
 532                                         break;
 533                                 ri=NULL;
 534                                 }
 535                         if (ri == NULL)
 536                                 {
 537                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 538                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 539                                 goto err;
 540                                 }
 541                         }
 542
 543                 /* If we haven't got a certificate try each ri in turn */
 544                 if (pcert == NULL)
 545                         {
 546                         /* Always attempt to decrypt all rinfo even
 547                          * after sucess as a defence against MMA timing
 548                          * attacks.
 549                          */
 550                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 551                                 {
 552                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 553
 554                                 if (pkcs7_decrypt_rinfo(&ek, &eklen,
 555                                                         ri, pkey) < 0)
 556                                         goto err;
 557                                 ERR_clear_error();
 558                                 }
 559                         }
 560                 else
 561                         {
 562                         /* Only exit on fatal errors, not decrypt failure */
 563                         if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
 564                                 goto err;
 565                         ERR_clear_error();
 566                         }
 567
 568                 evp_ctx=NULL;
 569                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 570                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 571                         goto err;
 572                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 573                         goto err;
 574                 /* Generate random key as MMA defence */
 575                 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
 576                 tkey = OPENSSL_malloc(tkeylen);
 577                 if (!tkey)
 578                         goto err;
 579                 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
 580                         goto err;
 581                 if (ek == NULL)
 582                         {
 583                         ek = tkey;
 584                         eklen = tkeylen;
 585                         tkey = NULL;
 586                         }
 587
 588                 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 589                         /* Some S/MIME clients don't use the same key
 590                          * and effective key length. The key length is
 591                          * determined by the size of the decrypted RSA key.
 592                          */
 593                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen))
 594                                 {
 595                                 /* Use random key as MMA defence */
 596                                 OPENSSL_cleanse(ek, eklen);
 597                                 OPENSSL_free(ek);
 598                                 ek = tkey;
 599                                 eklen = tkeylen;
 600                                 tkey = NULL;
 601                                 }
 602                 }
 603                 /* Clear errors so we don't leak information useful in MMA */
 604                 ERR_clear_error();
 605                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,ek,NULL,0) <= 0)
 606                         goto err;
 607
 608                 if (ek)
 609                         {
 610                         OPENSSL_cleanse(ek,eklen);
 611                         OPENSSL_free(ek);
 612                        ek = NULL;
 613                         }
 614                 if (tkey)
 615                         {
 616                         OPENSSL_cleanse(tkey,tkeylen);
 617                         OPENSSL_free(tkey);
 618                        tkey = NULL;
 619                         }
 620
 621                 if (out == NULL)
 622                         out=etmp;
 623                 else
 624                         BIO_push(out,etmp);
 625                 etmp=NULL;
 626                 }
 627
 628 #if 1
 629         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 630                 {
 631                 bio=in_bio;
 632                 }
 633         else
 634                 {
 635 #if 0
 636                 bio=BIO_new(BIO_s_mem());
 637                 /* We need to set this so that when we have read all
 638                  * the data, the encrypt BIO, if present, will read
 639                  * EOF and encode the last few bytes */
 640                 BIO_set_mem_eof_return(bio,0);
 641
 642                 if (data_body->length > 0)
 643                         BIO_write(bio,(char *)data_body->data,data_body->length);
 644 #else
 645                 if (data_body->length > 0)
 646                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 647                 else {
 648                         bio=BIO_new(BIO_s_mem());
 649                         BIO_set_mem_eof_return(bio,0);
 650                 }
 651                 if (bio == NULL)
 652                         goto err;
 653 #endif
 654                 }
 655         BIO_push(out,bio);
 656         bio=NULL;
 657 #endif
 658         if (0)
 659                 {
 660 err:
 661                if (ek)
 662                        {
 663                        OPENSSL_cleanse(ek,eklen);
 664                        OPENSSL_free(ek);
 665                        }
 666                if (tkey)
 667                        {
 668                        OPENSSL_cleanse(tkey,tkeylen);
 669                        OPENSSL_free(tkey);
 670                        }
 671                 if (out != NULL) BIO_free_all(out);
 672                 if (btmp != NULL) BIO_free_all(btmp);
 673                 if (etmp != NULL) BIO_free_all(etmp);
 674                 if (bio != NULL) BIO_free_all(bio);
 675                 out=NULL;
 676                 }
 677         return(out);
 678         }
 679
 680 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 681         {
 682         for (;;)
 683                 {
 684                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 685                 if (bio == NULL)
 686                         {
 687                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 688                         return NULL;
 689                         }
 690                 BIO_get_md_ctx(bio,pmd);
 691                 if (*pmd == NULL)
 692                         {
 693                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
 694                         return NULL;
 695                         }
 696                 if (EVP_MD_CTX_type(*pmd) == nid)
 697                         return bio;
 698                 bio=BIO_next(bio);
 699                 }
 700         return NULL;
 701         }
 702
 703 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
 704         {
 705         unsigned char md_data[EVP_MAX_MD_SIZE];
 706         unsigned int md_len;
 707
 708         /* Add signing time if not already present */
 709         if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime))
 710                 {
 711                 if (!PKCS7_add0_attrib_signing_time(si, NULL))
 712                         {
 713                         PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
 714                                         ERR_R_MALLOC_FAILURE);
 715                         return 0;
 716                         }
 717                 }
 718
 719         /* Add digest */
 720         if (!EVP_DigestFinal_ex(mctx, md_data,&md_len))
 721                 {
 722                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
 723                 return 0;
 724                 }
 725         if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
 726                 {
 727                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
 728                 return 0;
 729                 }
 730
 731         /* Now sign the attributes */
 732         if (!PKCS7_SIGNER_INFO_sign(si))
 733                         return 0;
 734
 735         return 1;
 736         }
 737
 738
 739 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 740         {
 741         int ret=0;
 742         int i,j;
 743         BIO *btmp;
 744         PKCS7_SIGNER_INFO *si;
 745         EVP_MD_CTX *mdc,ctx_tmp;
 746         STACK_OF(X509_ATTRIBUTE) *sk;
 747         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 748         ASN1_OCTET_STRING *os=NULL;
 749
 750         EVP_MD_CTX_init(&ctx_tmp);
 751         i=OBJ_obj2nid(p7->type);
 752         p7->state=PKCS7_S_HEADER;
 753
 754         switch (i)
 755                 {
 756         case NID_pkcs7_data:
 757                 os = p7->d.data;
 758                 break;
 759         case NID_pkcs7_signedAndEnveloped:
 760                 /* XXXXXXXXXXXXXXXX */
 761                 si_sk=p7->d.signed_and_enveloped->signer_info;
 762                 os = p7->d.signed_and_enveloped->enc_data->enc_data;
 763                 if (!os)
 764                         {
 765                         os=M_ASN1_OCTET_STRING_new();
 766                         if (!os)
 767                                 {
 768                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 769                                 goto err;
 770                                 }
 771                         p7->d.signed_and_enveloped->enc_data->enc_data=os;
 772                         }
 773                 break;
 774         case NID_pkcs7_enveloped:
 775                 /* XXXXXXXXXXXXXXXX */
 776                 os = p7->d.enveloped->enc_data->enc_data;
 777                 if (!os)
 778                         {
 779                         os=M_ASN1_OCTET_STRING_new();
 780                         if (!os)
 781                                 {
 782                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 783                                 goto err;
 784                                 }
 785                         p7->d.enveloped->enc_data->enc_data=os;
 786                         }
 787                 break;
 788         case NID_pkcs7_signed:
 789                 si_sk=p7->d.sign->signer_info;
 790                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 791                 /* If detached data then the content is excluded */
 792                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 793                         M_ASN1_OCTET_STRING_free(os);
 794                         p7->d.sign->contents->d.data = NULL;
 795                 }
 796                 break;
 797
 798         case NID_pkcs7_digest:
 799                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 800                 /* If detached data then the content is excluded */
 801                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 802                         {
 803                         M_ASN1_OCTET_STRING_free(os);
 804                         p7->d.digest->contents->d.data = NULL;
 805                         }
 806                 break;
 807
 808         default:
 809                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 810                 goto err;
 811                 }
 812
 813         if (si_sk != NULL)
 814                 {
 815                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 816                         {
 817                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 818                         if (si->pkey == NULL)
 819                                 continue;
 820
 821                         j = OBJ_obj2nid(si->digest_alg->algorithm);
 822
 823                         btmp=bio;
 824
 825                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 826
 827                         if (btmp == NULL)
 828                                 goto err;
 829
 830                         /* We now have the EVP_MD_CTX, lets do the
 831                          * signing. */
 832                         if (!EVP_MD_CTX_copy_ex(&ctx_tmp,mdc))
 833                                 goto err;
 834
 835                         sk=si->auth_attr;
 836
 837                         /* If there are attributes, we add the digest
 838                          * attribute and only sign the attributes */
 839                         if (sk_X509_ATTRIBUTE_num(sk) > 0)
 840                                 {
 841                                 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
 842                                         goto err;
 843                                 }
 844                         else
 845                                 {
 846                                 unsigned char *abuf = NULL;
 847                                 unsigned int abuflen;
 848                                 abuflen = EVP_PKEY_size(si->pkey);
 849                                 abuf = OPENSSL_malloc(abuflen);
 850                                 if (!abuf)
 851                                         goto err;
 852
 853                                 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
 854                                                         si->pkey))
 855                                         {
 856                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 857                                                         ERR_R_EVP_LIB);
 858                                         goto err;
 859                                         }
 860                                 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
 861                                 }
 862                         }
 863                 }
 864         else if (i == NID_pkcs7_digest)
 865                 {
 866                 unsigned char md_data[EVP_MAX_MD_SIZE];
 867                 unsigned int md_len;
 868                 if (!PKCS7_find_digest(&mdc, bio,
 869                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 870                         goto err;
 871                 if (!EVP_DigestFinal_ex(mdc,md_data,&md_len))
 872                         goto err;
 873                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 874                 }
 875
 876         if (!PKCS7_is_detached(p7) && !(os->flags & ASN1_STRING_FLAG_NDEF))
 877                 {
 878                 char *cont;
 879                 long contlen;
 880                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 881                 if (btmp == NULL)
 882                         {
 883                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 884                         goto err;
 885                         }
 886                 contlen = BIO_get_mem_data(btmp, &cont);
 887                 /* Mark the BIO read only then we can use its copy of the data
 888                  * instead of making an extra copy.
 889                  */
 890                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 891                 BIO_set_mem_eof_return(btmp, 0);
 892                 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
 893                 }
 894         ret=1;
 895 err:
 896         EVP_MD_CTX_cleanup(&ctx_tmp);
 897         return(ret);
 898         }
 899
 900 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
 901         {
 902         EVP_MD_CTX mctx;
 903         EVP_PKEY_CTX *pctx;
 904         unsigned char *abuf = NULL;
 905         int alen;
 906         size_t siglen;
 907         const EVP_MD *md = NULL;
 908
 909         md = EVP_get_digestbyobj(si->digest_alg->algorithm);
 910         if (md == NULL)
 911                 return 0;
 912
 913         EVP_MD_CTX_init(&mctx);
 914         if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
 915                 goto err;
 916
 917         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 918                                 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
 919                 {
 920                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 921                 goto err;
 922                 }
 923
 924         alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
 925                                 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 926         if(!abuf)
 927                 goto err;
 928         if (EVP_DigestSignUpdate(&mctx,abuf,alen) <= 0)
 929                 goto err;
 930         OPENSSL_free(abuf);
 931         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
 932                 goto err;
 933         abuf = OPENSSL_malloc(siglen);
 934         if(!abuf)
 935                 goto err;
 936         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
 937                 goto err;
 938
 939         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 940                                 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
 941                 {
 942                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 943                 goto err;
 944                 }
 945
 946         EVP_MD_CTX_cleanup(&mctx);
 947
 948         ASN1_STRING_set0(si->enc_digest, abuf, siglen);
 949
 950         return 1;
 951
 952         err:
 953         if (abuf)
 954                 OPENSSL_free(abuf);
 955         EVP_MD_CTX_cleanup(&mctx);
 956         return 0;
 957
 958         }
 959
 960 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 961              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 962         {
 963         PKCS7_ISSUER_AND_SERIAL *ias;
 964         int ret=0,i;
 965         STACK_OF(X509) *cert;
 966         X509 *x509;
 967
 968         if (PKCS7_type_is_signed(p7))
 969                 {
 970                 cert=p7->d.sign->cert;
 971                 }
 972         else if (PKCS7_type_is_signedAndEnveloped(p7))
 973                 {
 974                 cert=p7->d.signed_and_enveloped->cert;
 975                 }
 976         else
 977                 {
 978                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 979                 goto err;
 980                 }
 981         /* XXXXXXXXXXXXXXXXXXXXXXX */
 982         ias=si->issuer_and_serial;
 983
 984         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 985
 986         /* were we able to find the cert in passed to us */
 987         if (x509 == NULL)
 988                 {
 989                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 990                 goto err;
 991                 }
 992
 993         /* Lets verify */
 994         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 995                 {
 996                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 997                 goto err;
 998                 }
 999         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1000         i=X509_verify_cert(ctx);
1001         if (i <= 0)
1002                 {
1003                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
1004                 X509_STORE_CTX_cleanup(ctx);
1005                 goto err;
1006                 }
1007         X509_STORE_CTX_cleanup(ctx);
1008
1009         return PKCS7_signatureVerify(bio, p7, si, x509);
1010         err:
1011         return ret;
1012         }
1013
1014 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1015                                                                 X509 *x509)
1016         {
1017         ASN1_OCTET_STRING *os;
1018         EVP_MD_CTX mdc_tmp,*mdc;
1019         int ret=0,i;
1020         int md_type;
1021         STACK_OF(X509_ATTRIBUTE) *sk;
1022         BIO *btmp;
1023         EVP_PKEY *pkey;
1024
1025         EVP_MD_CTX_init(&mdc_tmp);
1026
1027         if (!PKCS7_type_is_signed(p7) &&
1028                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
1029                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1030                                                 PKCS7_R_WRONG_PKCS7_TYPE);
1031                 goto err;
1032         }
1033
1034         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
1035
1036         btmp=bio;
1037         for (;;)
1038                 {
1039                 if ((btmp == NULL) ||
1040                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
1041                         {
1042                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1043                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1044                         goto err;
1045                         }
1046                 BIO_get_md_ctx(btmp,&mdc);
1047                 if (mdc == NULL)
1048                         {
1049                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1050                                                         ERR_R_INTERNAL_ERROR);
1051                         goto err;
1052                         }
1053                 if (EVP_MD_CTX_type(mdc) == md_type)
1054                         break;
1055                 /* Workaround for some broken clients that put the signature
1056                  * OID instead of the digest OID in digest_alg->algorithm
1057                  */
1058                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1059                         break;
1060                 btmp=BIO_next(btmp);
1061                 }
1062
1063         /* mdc is the digest ctx that we want, unless there are attributes,
1064          * in which case the digest is the signed attributes */
1065         if (!EVP_MD_CTX_copy_ex(&mdc_tmp,mdc))
1066                 goto err;
1067
1068         sk=si->auth_attr;
1069         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
1070                 {
1071                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1072                 unsigned int md_len;
1073                 int alen;
1074                 ASN1_OCTET_STRING *message_digest;
1075
1076                 if (!EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len))
1077                         goto err;
1078                 message_digest=PKCS7_digest_from_attributes(sk);
1079                 if (!message_digest)
1080                         {
1081                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1082                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1083                         goto err;
1084                         }
1085                 if ((message_digest->length != (int)md_len) ||
1086                         (memcmp(message_digest->data,md_dat,md_len)))
1087                         {
1088 #if 0
1089 {
1090 int ii;
1091 for (ii=0; ii<message_digest->length; ii++)
1092         printf("%02X",message_digest->data[ii]); printf(" sent\n");
1093 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
1094 }
1095 #endif
1096                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1097                                                         PKCS7_R_DIGEST_FAILURE);
1098                         ret= -1;
1099                         goto err;
1100                         }
1101
1102                 if (!EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL))
1103                         goto err;
1104
1105                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1106                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1107                 if (alen <= 0)
1108                         {
1109                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,ERR_R_ASN1_LIB);
1110                         ret = -1;
1111                         goto err;
1112                         }
1113                 if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
1114                         goto err;
1115
1116                 OPENSSL_free(abuf);
1117                 }
1118
1119         os=si->enc_digest;
1120         pkey = X509_get_pubkey(x509);
1121         if (!pkey)
1122                 {
1123                 ret = -1;
1124                 goto err;
1125                 }
1126
1127         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
1128         EVP_PKEY_free(pkey);
1129         if (i <= 0)
1130                 {
1131                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1132                                                 PKCS7_R_SIGNATURE_FAILURE);
1133                 ret= -1;
1134                 goto err;
1135                 }
1136         else
1137                 ret=1;
1138 err:
1139         EVP_MD_CTX_cleanup(&mdc_tmp);
1140         return(ret);
1141         }
1142
1143 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1144         {
1145         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1146         PKCS7_RECIP_INFO *ri;
1147         int i;
1148
1149         i=OBJ_obj2nid(p7->type);
1150         if (i != NID_pkcs7_signedAndEnveloped)
1151                 return NULL;
1152         if (p7->d.signed_and_enveloped == NULL)
1153                 return NULL;
1154         rsk=p7->d.signed_and_enveloped->recipientinfo;
1155         if (rsk == NULL)
1156                 return NULL;
1157         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1158         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1159         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1160         return(ri->issuer_and_serial);
1161         }
1162
1163 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1164         {
1165         return(get_attribute(si->auth_attr,nid));
1166         }
1167
1168 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1169         {
1170         return(get_attribute(si->unauth_attr,nid));
1171         }
1172
1173 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1174         {
1175         int i;
1176         X509_ATTRIBUTE *xa;
1177         ASN1_OBJECT *o;
1178
1179         o=OBJ_nid2obj(nid);
1180         if (!o || !sk) return(NULL);
1181         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1182                 {
1183                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1184                 if (OBJ_cmp(xa->object,o) == 0)
1185                         {
1186                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1187                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1188                         else
1189                                 return(NULL);
1190                         }
1191                 }
1192         return(NULL);
1193         }
1194
1195 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1196 {
1197         ASN1_TYPE *astype;
1198         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1199         return astype->value.octet_string;
1200 }
1201
1202 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1203                                 STACK_OF(X509_ATTRIBUTE) *sk)
1204         {
1205         int i;
1206
1207         if (p7si->auth_attr != NULL)
1208                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1209         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1210         if (p7si->auth_attr == NULL)
1211                 return 0;
1212         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1213                 {
1214                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1215                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1216                     == NULL)
1217                         return(0);
1218                 }
1219         return(1);
1220         }
1221
1222 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1223         {
1224         int i;
1225
1226         if (p7si->unauth_attr != NULL)
1227                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1228                                            X509_ATTRIBUTE_free);
1229         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1230         if (p7si->unauth_attr == NULL)
1231                 return 0;
1232         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1233                 {
1234                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1235                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1236                     == NULL)
1237                         return(0);
1238                 }
1239         return(1);
1240         }
1241
1242 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1243              void *value)
1244         {
1245         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1246         }
1247
1248 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1249              void *value)
1250         {
1251         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1252         }
1253
1254 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1255                          void *value)
1256         {
1257         X509_ATTRIBUTE *attr=NULL;
1258
1259         if (*sk == NULL)
1260                 {
1261                 *sk = sk_X509_ATTRIBUTE_new_null();
1262                 if (*sk == NULL)
1263                         return 0;
1264 new_attrib:
1265                 if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
1266                         return 0;
1267                 if (!sk_X509_ATTRIBUTE_push(*sk,attr))
1268                         {
1269                         X509_ATTRIBUTE_free(attr);
1270                         return 0;
1271                         }
1272                 }
1273         else
1274                 {
1275                 int i;
1276
1277                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1278                         {
1279                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1280                         if (OBJ_obj2nid(attr->object) == nid)
1281                                 {
1282                                 X509_ATTRIBUTE_free(attr);
1283                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1284                                 if (attr == NULL)
1285                                         return 0;
1286                                 if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
1287                                         {
1288                                         X509_ATTRIBUTE_free(attr);
1289                                         return 0;
1290                                         }
1291                                 goto end;
1292                                 }
1293                         }
1294                 goto new_attrib;
1295                 }
1296 end:
1297         return(1);
1298         }
1299