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                 if (!PKCS7_is_detached(p7) && data_body == NULL)
 444                         {
 445                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_INVALID_SIGNED_DATA_TYPE);
 446                         goto err;
 447                         }
 448                 md_sk=p7->d.sign->md_algs;
 449                 break;
 450         case NID_pkcs7_signedAndEnveloped:
 451                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 452                 md_sk=p7->d.signed_and_enveloped->md_algs;
 453                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 454                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 455                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 456                 if (evp_cipher == NULL)
 457                         {
 458                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 459                         goto err;
 460                         }
 461                 break;
 462         case NID_pkcs7_enveloped:
 463                 rsk=p7->d.enveloped->recipientinfo;
 464                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 465                 data_body=p7->d.enveloped->enc_data->enc_data;
 466                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 467                 if (evp_cipher == NULL)
 468                         {
 469                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 470                         goto err;
 471                         }
 472                 break;
 473         default:
 474                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 475                 goto err;
 476                 }
 477
 478         /* We will be checking the signature */
 479         if (md_sk != NULL)
 480                 {
 481                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 482                         {
 483                         xa=sk_X509_ALGOR_value(md_sk,i);
 484                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 485                                 {
 486                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 487                                 goto err;
 488                                 }
 489
 490                         j=OBJ_obj2nid(xa->algorithm);
 491                         evp_md=EVP_get_digestbynid(j);
 492                         if (evp_md == NULL)
 493                                 {
 494                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 495                                 goto err;
 496                                 }
 497
 498                         BIO_set_md(btmp,evp_md);
 499                         if (out == NULL)
 500                                 out=btmp;
 501                         else
 502                                 BIO_push(out,btmp);
 503                         btmp=NULL;
 504                         }
 505                 }
 506
 507         if (evp_cipher != NULL)
 508                 {
 509 #if 0
 510                 unsigned char key[EVP_MAX_KEY_LENGTH];
 511                 unsigned char iv[EVP_MAX_IV_LENGTH];
 512                 unsigned char *p;
 513                 int keylen,ivlen;
 514                 int max;
 515                 X509_OBJECT ret;
 516 #endif
 517
 518                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 519                         {
 520                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 521                         goto err;
 522                         }
 523
 524                 /* It was encrypted, we need to decrypt the secret key
 525                  * with the private key */
 526
 527                 /* Find the recipientInfo which matches the passed certificate
 528                  * (if any)
 529                  */
 530
 531                 if (pcert)
 532                         {
 533                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 534                                 {
 535                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 536                                 if (!pkcs7_cmp_ri(ri, pcert))
 537                                         break;
 538                                 ri=NULL;
 539                                 }
 540                         if (ri == NULL)
 541                                 {
 542                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 543                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 544                                 goto err;
 545                                 }
 546                         }
 547
 548                 /* If we haven't got a certificate try each ri in turn */
 549                 if (pcert == NULL)
 550                         {
 551                         /* Always attempt to decrypt all rinfo even
 552                          * after success as a defence against MMA timing
 553                          * attacks.
 554                          */
 555                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 556                                 {
 557                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 558
 559                                 if (pkcs7_decrypt_rinfo(&ek, &eklen,
 560                                                         ri, pkey) < 0)
 561                                         goto err;
 562                                 ERR_clear_error();
 563                                 }
 564                         }
 565                 else
 566                         {
 567                         /* Only exit on fatal errors, not decrypt failure */
 568                         if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
 569                                 goto err;
 570                         ERR_clear_error();
 571                         }
 572
 573                 evp_ctx=NULL;
 574                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 575                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 576                         goto err;
 577                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 578                         goto err;
 579                 /* Generate random key as MMA defence */
 580                 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
 581                 tkey = OPENSSL_malloc(tkeylen);
 582                 if (!tkey)
 583                         goto err;
 584                 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
 585                         goto err;
 586                 if (ek == NULL)
 587                         {
 588                         ek = tkey;
 589                         eklen = tkeylen;
 590                         tkey = NULL;
 591                         }
 592
 593                 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 594                         /* Some S/MIME clients don't use the same key
 595                          * and effective key length. The key length is
 596                          * determined by the size of the decrypted RSA key.
 597                          */
 598                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen))
 599                                 {
 600                                 /* Use random key as MMA defence */
 601                                 OPENSSL_cleanse(ek, eklen);
 602                                 OPENSSL_free(ek);
 603                                 ek = tkey;
 604                                 eklen = tkeylen;
 605                                 tkey = NULL;
 606                                 }
 607                 }
 608                 /* Clear errors so we don't leak information useful in MMA */
 609                 ERR_clear_error();
 610                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,ek,NULL,0) <= 0)
 611                         goto err;
 612
 613                 if (ek)
 614                         {
 615                         OPENSSL_cleanse(ek,eklen);
 616                         OPENSSL_free(ek);
 617                        ek = NULL;
 618                         }
 619                 if (tkey)
 620                         {
 621                         OPENSSL_cleanse(tkey,tkeylen);
 622                         OPENSSL_free(tkey);
 623                        tkey = NULL;
 624                         }
 625
 626                 if (out == NULL)
 627                         out=etmp;
 628                 else
 629                         BIO_push(out,etmp);
 630                 etmp=NULL;
 631                 }
 632
 633 #if 1
 634         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 635                 {
 636                 bio=in_bio;
 637                 }
 638         else
 639                 {
 640 #if 0
 641                 bio=BIO_new(BIO_s_mem());
 642                 /* We need to set this so that when we have read all
 643                  * the data, the encrypt BIO, if present, will read
 644                  * EOF and encode the last few bytes */
 645                 BIO_set_mem_eof_return(bio,0);
 646
 647                 if (data_body->length > 0)
 648                         BIO_write(bio,(char *)data_body->data,data_body->length);
 649 #else
 650                 if (data_body->length > 0)
 651                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 652                 else {
 653                         bio=BIO_new(BIO_s_mem());
 654                         BIO_set_mem_eof_return(bio,0);
 655                 }
 656                 if (bio == NULL)
 657                         goto err;
 658 #endif
 659                 }
 660         BIO_push(out,bio);
 661         bio=NULL;
 662 #endif
 663         if (0)
 664                 {
 665 err:
 666                if (ek)
 667                        {
 668                        OPENSSL_cleanse(ek,eklen);
 669                        OPENSSL_free(ek);
 670                        }
 671                if (tkey)
 672                        {
 673                        OPENSSL_cleanse(tkey,tkeylen);
 674                        OPENSSL_free(tkey);
 675                        }
 676                 if (out != NULL) BIO_free_all(out);
 677                 if (btmp != NULL) BIO_free_all(btmp);
 678                 if (etmp != NULL) BIO_free_all(etmp);
 679                 if (bio != NULL) BIO_free_all(bio);
 680                 out=NULL;
 681                 }
 682         return(out);
 683         }
 684
 685 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 686         {
 687         for (;;)
 688                 {
 689                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 690                 if (bio == NULL)
 691                         {
 692                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 693                         return NULL;
 694                         }
 695                 BIO_get_md_ctx(bio,pmd);
 696                 if (*pmd == NULL)
 697                         {
 698                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
 699                         return NULL;
 700                         }
 701                 if (EVP_MD_CTX_type(*pmd) == nid)
 702                         return bio;
 703                 bio=BIO_next(bio);
 704                 }
 705         return NULL;
 706         }
 707
 708 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
 709         {
 710         unsigned char md_data[EVP_MAX_MD_SIZE];
 711         unsigned int md_len;
 712
 713         /* Add signing time if not already present */
 714         if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime))
 715                 {
 716                 if (!PKCS7_add0_attrib_signing_time(si, NULL))
 717                         {
 718                         PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
 719                                         ERR_R_MALLOC_FAILURE);
 720                         return 0;
 721                         }
 722                 }
 723
 724         /* Add digest */
 725         if (!EVP_DigestFinal_ex(mctx, md_data,&md_len))
 726                 {
 727                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
 728                 return 0;
 729                 }
 730         if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
 731                 {
 732                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
 733                 return 0;
 734                 }
 735
 736         /* Now sign the attributes */
 737         if (!PKCS7_SIGNER_INFO_sign(si))
 738                         return 0;
 739
 740         return 1;
 741         }
 742
 743
 744 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 745         {
 746         int ret=0;
 747         int i,j;
 748         BIO *btmp;
 749         PKCS7_SIGNER_INFO *si;
 750         EVP_MD_CTX *mdc,ctx_tmp;
 751         STACK_OF(X509_ATTRIBUTE) *sk;
 752         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 753         ASN1_OCTET_STRING *os=NULL;
 754
 755         EVP_MD_CTX_init(&ctx_tmp);
 756         i=OBJ_obj2nid(p7->type);
 757         p7->state=PKCS7_S_HEADER;
 758
 759         switch (i)
 760                 {
 761         case NID_pkcs7_data:
 762                 os = p7->d.data;
 763                 break;
 764         case NID_pkcs7_signedAndEnveloped:
 765                 /* XXXXXXXXXXXXXXXX */
 766                 si_sk=p7->d.signed_and_enveloped->signer_info;
 767                 os = p7->d.signed_and_enveloped->enc_data->enc_data;
 768                 if (!os)
 769                         {
 770                         os=M_ASN1_OCTET_STRING_new();
 771                         if (!os)
 772                                 {
 773                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 774                                 goto err;
 775                                 }
 776                         p7->d.signed_and_enveloped->enc_data->enc_data=os;
 777                         }
 778                 break;
 779         case NID_pkcs7_enveloped:
 780                 /* XXXXXXXXXXXXXXXX */
 781                 os = p7->d.enveloped->enc_data->enc_data;
 782                 if (!os)
 783                         {
 784                         os=M_ASN1_OCTET_STRING_new();
 785                         if (!os)
 786                                 {
 787                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 788                                 goto err;
 789                                 }
 790                         p7->d.enveloped->enc_data->enc_data=os;
 791                         }
 792                 break;
 793         case NID_pkcs7_signed:
 794                 si_sk=p7->d.sign->signer_info;
 795                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 796                 /* If detached data then the content is excluded */
 797                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 798                         M_ASN1_OCTET_STRING_free(os);
 799                         p7->d.sign->contents->d.data = NULL;
 800                 }
 801                 break;
 802
 803         case NID_pkcs7_digest:
 804                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 805                 /* If detached data then the content is excluded */
 806                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 807                         {
 808                         M_ASN1_OCTET_STRING_free(os);
 809                         p7->d.digest->contents->d.data = NULL;
 810                         }
 811                 break;
 812
 813         default:
 814                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 815                 goto err;
 816                 }
 817
 818         if (si_sk != NULL)
 819                 {
 820                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 821                         {
 822                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 823                         if (si->pkey == NULL)
 824                                 continue;
 825
 826                         j = OBJ_obj2nid(si->digest_alg->algorithm);
 827
 828                         btmp=bio;
 829
 830                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 831
 832                         if (btmp == NULL)
 833                                 goto err;
 834
 835                         /* We now have the EVP_MD_CTX, lets do the
 836                          * signing. */
 837                         if (!EVP_MD_CTX_copy_ex(&ctx_tmp,mdc))
 838                                 goto err;
 839
 840                         sk=si->auth_attr;
 841
 842                         /* If there are attributes, we add the digest
 843                          * attribute and only sign the attributes */
 844                         if (sk_X509_ATTRIBUTE_num(sk) > 0)
 845                                 {
 846                                 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
 847                                         goto err;
 848                                 }
 849                         else
 850                                 {
 851                                 unsigned char *abuf = NULL;
 852                                 unsigned int abuflen;
 853                                 abuflen = EVP_PKEY_size(si->pkey);
 854                                 abuf = OPENSSL_malloc(abuflen);
 855                                 if (!abuf)
 856                                         goto err;
 857
 858                                 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
 859                                                         si->pkey))
 860                                         {
 861                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 862                                                         ERR_R_EVP_LIB);
 863                                         goto err;
 864                                         }
 865                                 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
 866                                 }
 867                         }
 868                 }
 869         else if (i == NID_pkcs7_digest)
 870                 {
 871                 unsigned char md_data[EVP_MAX_MD_SIZE];
 872                 unsigned int md_len;
 873                 if (!PKCS7_find_digest(&mdc, bio,
 874                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 875                         goto err;
 876                 if (!EVP_DigestFinal_ex(mdc,md_data,&md_len))
 877                         goto err;
 878                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 879                 }
 880
 881         if (!PKCS7_is_detached(p7) && !(os->flags & ASN1_STRING_FLAG_NDEF))
 882                 {
 883                 char *cont;
 884                 long contlen;
 885                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 886                 if (btmp == NULL)
 887                         {
 888                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 889                         goto err;
 890                         }
 891                 contlen = BIO_get_mem_data(btmp, &cont);
 892                 /* Mark the BIO read only then we can use its copy of the data
 893                  * instead of making an extra copy.
 894                  */
 895                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 896                 BIO_set_mem_eof_return(btmp, 0);
 897                 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
 898                 }
 899         ret=1;
 900 err:
 901         EVP_MD_CTX_cleanup(&ctx_tmp);
 902         return(ret);
 903         }
 904
 905 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
 906         {
 907         EVP_MD_CTX mctx;
 908         EVP_PKEY_CTX *pctx;
 909         unsigned char *abuf = NULL;
 910         int alen;
 911         size_t siglen;
 912         const EVP_MD *md = NULL;
 913
 914         md = EVP_get_digestbyobj(si->digest_alg->algorithm);
 915         if (md == NULL)
 916                 return 0;
 917
 918         EVP_MD_CTX_init(&mctx);
 919         if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
 920                 goto err;
 921
 922         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 923                                 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
 924                 {
 925                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 926                 goto err;
 927                 }
 928
 929         alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
 930                                 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 931         if(!abuf)
 932                 goto err;
 933         if (EVP_DigestSignUpdate(&mctx,abuf,alen) <= 0)
 934                 goto err;
 935         OPENSSL_free(abuf);
 936         abuf = NULL;
 937         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
 938                 goto err;
 939         abuf = OPENSSL_malloc(siglen);
 940         if(!abuf)
 941                 goto err;
 942         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
 943                 goto err;
 944
 945         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 946                                 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
 947                 {
 948                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 949                 goto err;
 950                 }
 951
 952         EVP_MD_CTX_cleanup(&mctx);
 953
 954         ASN1_STRING_set0(si->enc_digest, abuf, siglen);
 955
 956         return 1;
 957
 958         err:
 959         if (abuf)
 960                 OPENSSL_free(abuf);
 961         EVP_MD_CTX_cleanup(&mctx);
 962         return 0;
 963
 964         }
 965
 966 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 967              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 968         {
 969         PKCS7_ISSUER_AND_SERIAL *ias;
 970         int ret=0,i;
 971         STACK_OF(X509) *cert;
 972         X509 *x509;
 973
 974         if (PKCS7_type_is_signed(p7))
 975                 {
 976                 cert=p7->d.sign->cert;
 977                 }
 978         else if (PKCS7_type_is_signedAndEnveloped(p7))
 979                 {
 980                 cert=p7->d.signed_and_enveloped->cert;
 981                 }
 982         else
 983                 {
 984                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 985                 goto err;
 986                 }
 987         /* XXXXXXXXXXXXXXXXXXXXXXX */
 988         ias=si->issuer_and_serial;
 989
 990         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 991
 992         /* were we able to find the cert in passed to us */
 993         if (x509 == NULL)
 994                 {
 995                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 996                 goto err;
 997                 }
 998
 999         /* Lets verify */
1000         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
1001                 {
1002                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
1003                 goto err;
1004                 }
1005         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1006         i=X509_verify_cert(ctx);
1007         if (i <= 0)
1008                 {
1009                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
1010                 X509_STORE_CTX_cleanup(ctx);
1011                 goto err;
1012                 }
1013         X509_STORE_CTX_cleanup(ctx);
1014
1015         return PKCS7_signatureVerify(bio, p7, si, x509);
1016         err:
1017         return ret;
1018         }
1019
1020 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1021                                                                 X509 *x509)
1022         {
1023         ASN1_OCTET_STRING *os;
1024         EVP_MD_CTX mdc_tmp,*mdc;
1025         int ret=0,i;
1026         int md_type;
1027         STACK_OF(X509_ATTRIBUTE) *sk;
1028         BIO *btmp;
1029         EVP_PKEY *pkey;
1030
1031         EVP_MD_CTX_init(&mdc_tmp);
1032
1033         if (!PKCS7_type_is_signed(p7) &&
1034                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
1035                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1036                                                 PKCS7_R_WRONG_PKCS7_TYPE);
1037                 goto err;
1038         }
1039
1040         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
1041
1042         btmp=bio;
1043         for (;;)
1044                 {
1045                 if ((btmp == NULL) ||
1046                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
1047                         {
1048                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1049                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1050                         goto err;
1051                         }
1052                 BIO_get_md_ctx(btmp,&mdc);
1053                 if (mdc == NULL)
1054                         {
1055                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1056                                                         ERR_R_INTERNAL_ERROR);
1057                         goto err;
1058                         }
1059                 if (EVP_MD_CTX_type(mdc) == md_type)
1060                         break;
1061                 /* Workaround for some broken clients that put the signature
1062                  * OID instead of the digest OID in digest_alg->algorithm
1063                  */
1064                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1065                         break;
1066                 btmp=BIO_next(btmp);
1067                 }
1068
1069         /* mdc is the digest ctx that we want, unless there are attributes,
1070          * in which case the digest is the signed attributes */
1071         if (!EVP_MD_CTX_copy_ex(&mdc_tmp,mdc))
1072                 goto err;
1073
1074         sk=si->auth_attr;
1075         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
1076                 {
1077                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1078                 unsigned int md_len;
1079                 int alen;
1080                 ASN1_OCTET_STRING *message_digest;
1081
1082                 if (!EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len))
1083                         goto err;
1084                 message_digest=PKCS7_digest_from_attributes(sk);
1085                 if (!message_digest)
1086                         {
1087                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1088                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1089                         goto err;
1090                         }
1091                 if ((message_digest->length != (int)md_len) ||
1092                         (memcmp(message_digest->data,md_dat,md_len)))
1093                         {
1094 #if 0
1095 {
1096 int ii;
1097 for (ii=0; ii<message_digest->length; ii++)
1098         printf("%02X",message_digest->data[ii]); printf(" sent\n");
1099 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
1100 }
1101 #endif
1102                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1103                                                         PKCS7_R_DIGEST_FAILURE);
1104                         ret= -1;
1105                         goto err;
1106                         }
1107
1108                 if (!EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL))
1109                         goto err;
1110
1111                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1112                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1113                 if (alen <= 0)
1114                         {
1115                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,ERR_R_ASN1_LIB);
1116                         ret = -1;
1117                         goto err;
1118                         }
1119                 if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
1120                         goto err;
1121
1122                 OPENSSL_free(abuf);
1123                 }
1124
1125         os=si->enc_digest;
1126         pkey = X509_get_pubkey(x509);
1127         if (!pkey)
1128                 {
1129                 ret = -1;
1130                 goto err;
1131                 }
1132
1133         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
1134         EVP_PKEY_free(pkey);
1135         if (i <= 0)
1136                 {
1137                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1138                                                 PKCS7_R_SIGNATURE_FAILURE);
1139                 ret= -1;
1140                 goto err;
1141                 }
1142         else
1143                 ret=1;
1144 err:
1145         EVP_MD_CTX_cleanup(&mdc_tmp);
1146         return(ret);
1147         }
1148
1149 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1150         {
1151         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1152         PKCS7_RECIP_INFO *ri;
1153         int i;
1154
1155         i=OBJ_obj2nid(p7->type);
1156         if (i != NID_pkcs7_signedAndEnveloped)
1157                 return NULL;
1158         if (p7->d.signed_and_enveloped == NULL)
1159                 return NULL;
1160         rsk=p7->d.signed_and_enveloped->recipientinfo;
1161         if (rsk == NULL)
1162                 return NULL;
1163         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1164         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1165         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1166         return(ri->issuer_and_serial);
1167         }
1168
1169 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1170         {
1171         return(get_attribute(si->auth_attr,nid));
1172         }
1173
1174 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1175         {
1176         return(get_attribute(si->unauth_attr,nid));
1177         }
1178
1179 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1180         {
1181         int i;
1182         X509_ATTRIBUTE *xa;
1183         ASN1_OBJECT *o;
1184
1185         o=OBJ_nid2obj(nid);
1186         if (!o || !sk) return(NULL);
1187         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1188                 {
1189                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1190                 if (OBJ_cmp(xa->object,o) == 0)
1191                         {
1192                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1193                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1194                         else
1195                                 return(NULL);
1196                         }
1197                 }
1198         return(NULL);
1199         }
1200
1201 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1202 {
1203         ASN1_TYPE *astype;
1204         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1205         return astype->value.octet_string;
1206 }
1207
1208 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1209                                 STACK_OF(X509_ATTRIBUTE) *sk)
1210         {
1211         int i;
1212
1213         if (p7si->auth_attr != NULL)
1214                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1215         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1216         if (p7si->auth_attr == NULL)
1217                 return 0;
1218         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1219                 {
1220                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1221                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1222                     == NULL)
1223                         return(0);
1224                 }
1225         return(1);
1226         }
1227
1228 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1229         {
1230         int i;
1231
1232         if (p7si->unauth_attr != NULL)
1233                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1234                                            X509_ATTRIBUTE_free);
1235         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1236         if (p7si->unauth_attr == NULL)
1237                 return 0;
1238         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1239                 {
1240                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1241                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1242                     == NULL)
1243                         return(0);
1244                 }
1245         return(1);
1246         }
1247
1248 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1249              void *value)
1250         {
1251         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1252         }
1253
1254 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1255              void *value)
1256         {
1257         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1258         }
1259
1260 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1261                          void *value)
1262         {
1263         X509_ATTRIBUTE *attr=NULL;
1264
1265         if (*sk == NULL)
1266                 {
1267                 *sk = sk_X509_ATTRIBUTE_new_null();
1268                 if (*sk == NULL)
1269                         return 0;
1270 new_attrib:
1271                 if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
1272                         return 0;
1273                 if (!sk_X509_ATTRIBUTE_push(*sk,attr))
1274                         {
1275                         X509_ATTRIBUTE_free(attr);
1276                         return 0;
1277                         }
1278                 }
1279         else
1280                 {
1281                 int i;
1282
1283                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1284                         {
1285                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1286                         if (OBJ_obj2nid(attr->object) == nid)
1287                                 {
1288                                 X509_ATTRIBUTE_free(attr);
1289                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1290                                 if (attr == NULL)
1291                                         return 0;
1292                                 if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
1293                                         {
1294                                         X509_ATTRIBUTE_free(attr);
1295                                         return 0;
1296                                         }
1297                                 goto end;
1298                                 }
1299                         }
1300                 goto new_attrib;
1301                 }
1302 end:
1303         return(1);
1304         }
1305