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pk7_doit.c

/* crypto/pkcs7/pk7_doit.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>

static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
                   void *value);
static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);

static int PKCS7_type_is_other(PKCS7* p7)
      {
      int isOther=1;
      
      int nid=OBJ_obj2nid(p7->type);

      switch( nid )
            {
      case NID_pkcs7_data:
      case NID_pkcs7_signed:
      case NID_pkcs7_enveloped:
      case NID_pkcs7_signedAndEnveloped:
      case NID_pkcs7_digest:
      case NID_pkcs7_encrypted:
            isOther=0;
            break;
      default:
            isOther=1;
            }

      return isOther;

      }

static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
      {
      if ( PKCS7_type_is_data(p7))
            return p7->d.data;
      if ( PKCS7_type_is_other(p7) && p7->d.other
            && (p7->d.other->type == V_ASN1_OCTET_STRING))
            return p7->d.other->value.octet_string;
      return NULL;
      }

static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
      {
      BIO *btmp;
      const EVP_MD *md;
      if ((btmp=BIO_new(BIO_f_md())) == NULL)
            {
            PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
            goto err;
            }

      md=EVP_get_digestbyobj(alg->algorithm);
      if (md == NULL)
            {
            PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
            goto err;
            }

      BIO_set_md(btmp,md);
      if (*pbio == NULL)
            *pbio=btmp;
      else if (!BIO_push(*pbio,btmp))
            {
            PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
            goto err;
            }
      btmp=NULL;

      return 1;

      err:
      if (btmp)
            BIO_free(btmp);
      return 0;

      }

BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
      {
      int i;
      BIO *out=NULL,*btmp=NULL;
      X509_ALGOR *xa = NULL;
      const EVP_CIPHER *evp_cipher=NULL;
      STACK_OF(X509_ALGOR) *md_sk=NULL;
      STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
      X509_ALGOR *xalg=NULL;
      PKCS7_RECIP_INFO *ri=NULL;
      EVP_PKEY *pkey;
      ASN1_OCTET_STRING *os=NULL;

      i=OBJ_obj2nid(p7->type);
      p7->state=PKCS7_S_HEADER;

      switch (i)
            {
      case NID_pkcs7_signed:
            md_sk=p7->d.sign->md_algs;
            os = PKCS7_get_octet_string(p7->d.sign->contents);
            break;
      case NID_pkcs7_signedAndEnveloped:
            rsk=p7->d.signed_and_enveloped->recipientinfo;
            md_sk=p7->d.signed_and_enveloped->md_algs;
            xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
            evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
            if (evp_cipher == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATAINIT,
                                    PKCS7_R_CIPHER_NOT_INITIALIZED);
                  goto err;
                  }
            break;
      case NID_pkcs7_enveloped:
            rsk=p7->d.enveloped->recipientinfo;
            xalg=p7->d.enveloped->enc_data->algorithm;
            evp_cipher=p7->d.enveloped->enc_data->cipher;
            if (evp_cipher == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATAINIT,
                                    PKCS7_R_CIPHER_NOT_INITIALIZED);
                  goto err;
                  }
            break;
      case NID_pkcs7_digest:
            xa = p7->d.digest->md;
            os = PKCS7_get_octet_string(p7->d.digest->contents);
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
              goto err;
            }

      for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
            if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
                  goto err;

      if (xa && !PKCS7_bio_add_digest(&out, xa))
                  goto err;

      if (evp_cipher != NULL)
            {
            unsigned char key[EVP_MAX_KEY_LENGTH];
            unsigned char iv[EVP_MAX_IV_LENGTH];
            int keylen,ivlen;
            int jj,max;
            unsigned char *tmp;
            EVP_CIPHER_CTX *ctx;

            if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
                  goto err;
                  }
            BIO_get_cipher_ctx(btmp, &ctx);
            keylen=EVP_CIPHER_key_length(evp_cipher);
            ivlen=EVP_CIPHER_iv_length(evp_cipher);
            xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
            if (ivlen > 0)
                  if (RAND_pseudo_bytes(iv,ivlen) <= 0)
                        goto err;
            if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
                  goto err;
            if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
                  goto err;
            if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
                  goto err;

            if (ivlen > 0) {
                  if (xalg->parameter == NULL) {
                        xalg->parameter = ASN1_TYPE_new();
                        if (xalg->parameter == NULL)
                              goto err;
                  }
                  if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
                         goto err;
            }

            /* Lets do the pub key stuff :-) */
            max=0;
            for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
                  {
                  ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
                  if (ri->cert == NULL)
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
                        goto err;
                        }
                  if ((pkey=X509_get_pubkey(ri->cert)) == NULL)
                        goto err;
                  jj=EVP_PKEY_size(pkey);
                  EVP_PKEY_free(pkey);
                  if (max < jj) max=jj;
                  }
            if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
                  {
                  ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
                  if ((pkey=X509_get_pubkey(ri->cert)) == NULL)
                        goto err;
                  jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
                  EVP_PKEY_free(pkey);
                  if (jj <= 0)
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
                        OPENSSL_free(tmp);
                        goto err;
                        }
                  if (!M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj))
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATAINIT,
                              ERR_R_MALLOC_FAILURE);
                        OPENSSL_free(tmp);
                        goto err;
                        }
                  }
            OPENSSL_free(tmp);
            OPENSSL_cleanse(key, keylen);

            if (out == NULL)
                  out=btmp;
            else
                  BIO_push(out,btmp);
            btmp=NULL;
            }

      if (bio == NULL)
            {
            if (PKCS7_is_detached(p7))
                  bio=BIO_new(BIO_s_null());
            else if (os && os->length > 0)
                  bio = BIO_new_mem_buf(os->data, os->length);
            if(bio == NULL)
                  {
                  bio=BIO_new(BIO_s_mem());
                  if (bio == NULL)
                        goto err;
                  BIO_set_mem_eof_return(bio,0);
                  }
            }
      BIO_push(out,bio);
      bio=NULL;
      if (0)
            {
err:
            if (out != NULL)
                  BIO_free_all(out);
            if (btmp != NULL)
                  BIO_free_all(btmp);
            out=NULL;
            }
      return(out);
      }

static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
      {
      int ret;
      ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
                        pcert->cert_info->issuer);
      if (ret)
            return ret;
      return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
                              ri->issuer_and_serial->serial);
      }

/* int */
BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
      {
      int i,j;
      BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
      unsigned char *tmp=NULL;
      X509_ALGOR *xa;
      ASN1_OCTET_STRING *data_body=NULL;
      const EVP_MD *evp_md;
      const EVP_CIPHER *evp_cipher=NULL;
      EVP_CIPHER_CTX *evp_ctx=NULL;
      X509_ALGOR *enc_alg=NULL;
      STACK_OF(X509_ALGOR) *md_sk=NULL;
      STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
      X509_ALGOR *xalg=NULL;
      PKCS7_RECIP_INFO *ri=NULL;

      i=OBJ_obj2nid(p7->type);
      p7->state=PKCS7_S_HEADER;

      switch (i)
            {
      case NID_pkcs7_signed:
            data_body=PKCS7_get_octet_string(p7->d.sign->contents);
            md_sk=p7->d.sign->md_algs;
            break;
      case NID_pkcs7_signedAndEnveloped:
            rsk=p7->d.signed_and_enveloped->recipientinfo;
            md_sk=p7->d.signed_and_enveloped->md_algs;
            data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
            enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
            evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
            if (evp_cipher == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
                  goto err;
                  }
            xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
            break;
      case NID_pkcs7_enveloped:
            rsk=p7->d.enveloped->recipientinfo;
            enc_alg=p7->d.enveloped->enc_data->algorithm;
            data_body=p7->d.enveloped->enc_data->enc_data;
            evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
            if (evp_cipher == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
                  goto err;
                  }
            xalg=p7->d.enveloped->enc_data->algorithm;
            break;
      default:
            PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
              goto err;
            }

      /* We will be checking the signature */
      if (md_sk != NULL)
            {
            for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
                  {
                  xa=sk_X509_ALGOR_value(md_sk,i);
                  if ((btmp=BIO_new(BIO_f_md())) == NULL)
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
                        goto err;
                        }

                  j=OBJ_obj2nid(xa->algorithm);
                  evp_md=EVP_get_digestbynid(j);
                  if (evp_md == NULL)
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
                        goto err;
                        }

                  BIO_set_md(btmp,evp_md);
                  if (out == NULL)
                        out=btmp;
                  else
                        BIO_push(out,btmp);
                  btmp=NULL;
                  }
            }

      if (evp_cipher != NULL)
            {
#if 0
            unsigned char key[EVP_MAX_KEY_LENGTH];
            unsigned char iv[EVP_MAX_IV_LENGTH];
            unsigned char *p;
            int keylen,ivlen;
            int max;
            X509_OBJECT ret;
#endif
            int jj;

            if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
                  goto err;
                  }

            /* It was encrypted, we need to decrypt the secret key
             * with the private key */

            /* Find the recipientInfo which matches the passed certificate
             * (if any)
             */

            if (pcert) {
                  for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
                        ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
                        if (!pkcs7_cmp_ri(ri, pcert))
                              break;
                        ri=NULL;
                  }
                  if (ri == NULL) {
                        PKCS7err(PKCS7_F_PKCS7_DATADECODE,
                              PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
                        goto err;
                  }
            }

            jj=EVP_PKEY_size(pkey);
            tmp=(unsigned char *)OPENSSL_malloc(jj+10);
            if (tmp == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }

            /* If we haven't got a certificate try each ri in turn */

            if (pcert == NULL)
                  {
                  for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
                        {
                        ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
                        jj=EVP_PKEY_decrypt(tmp,
                              M_ASN1_STRING_data(ri->enc_key),
                              M_ASN1_STRING_length(ri->enc_key),
                                    pkey);
                        if (jj > 0)
                              break;
                        ERR_clear_error();
                        ri = NULL;
                        }
                  if (ri == NULL)
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATADECODE,
                              PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
                        goto err;
                        }
                  }
            else
                  {
                  jj=EVP_PKEY_decrypt(tmp,
                        M_ASN1_STRING_data(ri->enc_key),
                        M_ASN1_STRING_length(ri->enc_key), pkey);
                  if (jj <= 0)
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATADECODE,
                                                ERR_R_EVP_LIB);
                        goto err;
                        }
                  }

            evp_ctx=NULL;
            BIO_get_cipher_ctx(etmp,&evp_ctx);
            if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
                  goto err;
            if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
                  goto err;

            if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
                  /* Some S/MIME clients don't use the same key
                   * and effective key length. The key length is
                   * determined by the size of the decrypted RSA key.
                   */
                  if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATADECODE,
                              PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
                        goto err;
                        }
            } 
            if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0)
                  goto err;

            OPENSSL_cleanse(tmp,jj);

            if (out == NULL)
                  out=etmp;
            else
                  BIO_push(out,etmp);
            etmp=NULL;
            }

#if 1
      if (PKCS7_is_detached(p7) || (in_bio != NULL))
            {
            bio=in_bio;
            }
      else 
            {
#if 0
            bio=BIO_new(BIO_s_mem());
            /* We need to set this so that when we have read all
             * the data, the encrypt BIO, if present, will read
             * EOF and encode the last few bytes */
            BIO_set_mem_eof_return(bio,0);

            if (data_body->length > 0)
                  BIO_write(bio,(char *)data_body->data,data_body->length);
#else
            if (data_body->length > 0)
                  bio = BIO_new_mem_buf(data_body->data,data_body->length);
            else {
                  bio=BIO_new(BIO_s_mem());
                  BIO_set_mem_eof_return(bio,0);
            }
            if (bio == NULL)
                  goto err;
#endif
            }
      BIO_push(out,bio);
      bio=NULL;
#endif
      if (0)
            {
err:
            if (out != NULL) BIO_free_all(out);
            if (btmp != NULL) BIO_free_all(btmp);
            if (etmp != NULL) BIO_free_all(etmp);
            if (bio != NULL) BIO_free_all(bio);
            out=NULL;
            }
      if (tmp != NULL)
            OPENSSL_free(tmp);
      return(out);
      }

static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
      {
      for (;;)
            {
            bio=BIO_find_type(bio,BIO_TYPE_MD);
            if (bio == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
                  return NULL;      
                  }
            BIO_get_md_ctx(bio,pmd);
            if (*pmd == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
                  return NULL;
                  }     
            if (EVP_MD_CTX_type(*pmd) == nid)
                  return bio;
            bio=BIO_next(bio);
            }
      return NULL;
      }

int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
      {
      int ret=0;
      int i,j;
      BIO *btmp;
      BUF_MEM *buf_mem=NULL;
      BUF_MEM *buf=NULL;
      PKCS7_SIGNER_INFO *si;
      EVP_MD_CTX *mdc,ctx_tmp;
      STACK_OF(X509_ATTRIBUTE) *sk;
      STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
      ASN1_OCTET_STRING *os=NULL;

      EVP_MD_CTX_init(&ctx_tmp);
      i=OBJ_obj2nid(p7->type);
      p7->state=PKCS7_S_HEADER;

      switch (i)
            {
      case NID_pkcs7_signedAndEnveloped:
            /* XXXXXXXXXXXXXXXX */
            si_sk=p7->d.signed_and_enveloped->signer_info;
            if (!(os=M_ASN1_OCTET_STRING_new()))
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            p7->d.signed_and_enveloped->enc_data->enc_data=os;
            break;
      case NID_pkcs7_enveloped:
            /* XXXXXXXXXXXXXXXX */
            if (!(os=M_ASN1_OCTET_STRING_new()))
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            p7->d.enveloped->enc_data->enc_data=os;
            break;
      case NID_pkcs7_signed:
            si_sk=p7->d.sign->signer_info;
            os=PKCS7_get_octet_string(p7->d.sign->contents);
            /* If detached data then the content is excluded */
            if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
                  M_ASN1_OCTET_STRING_free(os);
                  p7->d.sign->contents->d.data = NULL;
            }
            break;

      case NID_pkcs7_digest:
            os=PKCS7_get_octet_string(p7->d.digest->contents);
            /* If detached data then the content is excluded */
            if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
                  {
                  M_ASN1_OCTET_STRING_free(os);
                  p7->d.digest->contents->d.data = NULL;
                  }
            break;

            }

      if (si_sk != NULL)
            {
            if ((buf=BUF_MEM_new()) == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
                  goto err;
                  }
            for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
                  {
                  si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
                  if (si->pkey == NULL) continue;

                  j=OBJ_obj2nid(si->digest_alg->algorithm);

                  btmp=bio;

                  btmp = PKCS7_find_digest(&mdc, btmp, j);

                  if (btmp == NULL)
                        goto err;

                  /* We now have the EVP_MD_CTX, lets do the
                   * signing. */
                  EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
                  if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
                        goto err;
                        }

                  sk=si->auth_attr;

                  /* If there are attributes, we add the digest
                   * attribute and only sign the attributes */
                  if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
                        {
                        unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
                        unsigned int md_len, alen;
                        ASN1_OCTET_STRING *digest;
                        ASN1_UTCTIME *sign_time;
                        const EVP_MD *md_tmp;

                        /* Add signing time if not already present */
                        if (!PKCS7_get_signed_attribute(si,
                                          NID_pkcs9_signingTime))
                              {
                              if (!(sign_time=X509_gmtime_adj(NULL,0)))
                                    {
                                    PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
                                          ERR_R_MALLOC_FAILURE);
                                    goto err;
                                    }
                              if (!PKCS7_add_signed_attribute(si,
                                    NID_pkcs9_signingTime,
                                    V_ASN1_UTCTIME,sign_time))
                                    {
                                    M_ASN1_UTCTIME_free(sign_time);
                                    goto err;
                                    }
                              }

                        /* Add digest */
                        md_tmp=EVP_MD_CTX_md(&ctx_tmp);
                        EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
                        if (!(digest=M_ASN1_OCTET_STRING_new()))
                              {
                              PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
                                    ERR_R_MALLOC_FAILURE);
                              goto err;
                              }
                        if (!M_ASN1_OCTET_STRING_set(digest,md_data,
                                                md_len))
                              {
                              PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
                                    ERR_R_MALLOC_FAILURE);
                              M_ASN1_OCTET_STRING_free(digest);
                              goto err;
                              }
                        if (!PKCS7_add_signed_attribute(si,
                              NID_pkcs9_messageDigest,
                              V_ASN1_OCTET_STRING,digest))
                              {
                              M_ASN1_OCTET_STRING_free(digest);
                              goto err;
                              }

                        /* Now sign the attributes */
                        EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
                        alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
                                          ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
                        if(!abuf) goto err;
                        EVP_SignUpdate(&ctx_tmp,abuf,alen);
                        OPENSSL_free(abuf);
                        }

#ifndef OPENSSL_NO_DSA
                  if (si->pkey->type == EVP_PKEY_DSA)
                        ctx_tmp.digest=EVP_dss1();
#endif
#ifndef OPENSSL_NO_ECDSA
                  if (si->pkey->type == EVP_PKEY_EC)
                        ctx_tmp.digest=EVP_ecdsa();
#endif

                  if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
                        (unsigned int *)&buf->length,si->pkey))
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_EVP_LIB);
                        goto err;
                        }
                  if (!ASN1_STRING_set(si->enc_digest,
                        (unsigned char *)buf->data,buf->length))
                        {
                        PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_ASN1_LIB);
                        goto err;
                        }
                  }
            }
      else if (i == NID_pkcs7_digest)
            {
            unsigned char md_data[EVP_MAX_MD_SIZE];
            unsigned int md_len;
            if (!PKCS7_find_digest(&mdc, bio,
                        OBJ_obj2nid(p7->d.digest->md->algorithm)))
                  goto err;
            EVP_DigestFinal_ex(mdc,md_data,&md_len);
            M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
            }

      if (!PKCS7_is_detached(p7))
            {
            btmp=BIO_find_type(bio,BIO_TYPE_MEM);
            if (btmp == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
                  goto err;
                  }
            BIO_get_mem_ptr(btmp,&buf_mem);
            /* Mark the BIO read only then we can use its copy of the data
             * instead of making an extra copy.
             */
            BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
            BIO_set_mem_eof_return(btmp, 0);
            os->data = (unsigned char *)buf_mem->data;
            os->length = buf_mem->length;
#if 0
            M_ASN1_OCTET_STRING_set(os,
                  (unsigned char *)buf_mem->data,buf_mem->length);
#endif
            }
      ret=1;
err:
      EVP_MD_CTX_cleanup(&ctx_tmp);
      if (buf != NULL) BUF_MEM_free(buf);
      return(ret);
      }

int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
           PKCS7 *p7, PKCS7_SIGNER_INFO *si)
      {
      PKCS7_ISSUER_AND_SERIAL *ias;
      int ret=0,i;
      STACK_OF(X509) *cert;
      X509 *x509;

      if (PKCS7_type_is_signed(p7))
            {
            cert=p7->d.sign->cert;
            }
      else if (PKCS7_type_is_signedAndEnveloped(p7))
            {
            cert=p7->d.signed_and_enveloped->cert;
            }
      else
            {
            PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
            goto err;
            }
      /* XXXXXXXXXXXXXXXXXXXXXXX */
      ias=si->issuer_and_serial;

      x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);

      /* were we able to find the cert in passed to us */
      if (x509 == NULL)
            {
            PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
            goto err;
            }

      /* Lets verify */
      if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
            {
            PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
            goto err;
            }
      X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
      i=X509_verify_cert(ctx);
      if (i <= 0) 
            {
            PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
            X509_STORE_CTX_cleanup(ctx);
            goto err;
            }
      X509_STORE_CTX_cleanup(ctx);

      return PKCS7_signatureVerify(bio, p7, si, x509);
      err:
      return ret;
      }

int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
                                                X509 *x509)
      {
      ASN1_OCTET_STRING *os;
      EVP_MD_CTX mdc_tmp,*mdc;
      int ret=0,i;
      int md_type;
      STACK_OF(X509_ATTRIBUTE) *sk;
      BIO *btmp;
      EVP_PKEY *pkey;

      EVP_MD_CTX_init(&mdc_tmp);

      if (!PKCS7_type_is_signed(p7) && 
                        !PKCS7_type_is_signedAndEnveloped(p7)) {
            PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
                                    PKCS7_R_WRONG_PKCS7_TYPE);
            goto err;
      }

      md_type=OBJ_obj2nid(si->digest_alg->algorithm);

      btmp=bio;
      for (;;)
            {
            if ((btmp == NULL) ||
                  ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
                  {
                  PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
                              PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
                  goto err;
                  }
            BIO_get_md_ctx(btmp,&mdc);
            if (mdc == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
                                          ERR_R_INTERNAL_ERROR);
                  goto err;
                  }
            if (EVP_MD_CTX_type(mdc) == md_type)
                  break;
            /* Workaround for some broken clients that put the signature
             * OID instead of the digest OID in digest_alg->algorithm
             */
            if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
                  break;
            btmp=BIO_next(btmp);
            }

      /* mdc is the digest ctx that we want, unless there are attributes,
       * in which case the digest is the signed attributes */
      EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);

      sk=si->auth_attr;
      if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
            {
            unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
                unsigned int md_len, alen;
            ASN1_OCTET_STRING *message_digest;

            EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
            message_digest=PKCS7_digest_from_attributes(sk);
            if (!message_digest)
                  {
                  PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
                              PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
                  goto err;
                  }
            if ((message_digest->length != (int)md_len) ||
                  (memcmp(message_digest->data,md_dat,md_len)))
                  {
#if 0
{
int ii;
for (ii=0; ii<message_digest->length; ii++)
      printf("%02X",message_digest->data[ii]); printf(" sent\n");
for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
}
#endif
                  PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
                                          PKCS7_R_DIGEST_FAILURE);
                  ret= -1;
                  goto err;
                  }

            EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);

            alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
                                    ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
            EVP_VerifyUpdate(&mdc_tmp, abuf, alen);

            OPENSSL_free(abuf);
            }

      os=si->enc_digest;
      pkey = X509_get_pubkey(x509);
      if (!pkey)
            {
            ret = -1;
            goto err;
            }
#ifndef OPENSSL_NO_DSA
      if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
#endif
#ifndef OPENSSL_NO_ECDSA
      if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
#endif

      i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
      EVP_PKEY_free(pkey);
      if (i <= 0)
            {
            PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
                                    PKCS7_R_SIGNATURE_FAILURE);
            ret= -1;
            goto err;
            }
      else
            ret=1;
err:
      EVP_MD_CTX_cleanup(&mdc_tmp);
      return(ret);
      }

PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
      {
      STACK_OF(PKCS7_RECIP_INFO) *rsk;
      PKCS7_RECIP_INFO *ri;
      int i;

      i=OBJ_obj2nid(p7->type);
      if (i != NID_pkcs7_signedAndEnveloped)
            return NULL;
      if (p7->d.signed_and_enveloped == NULL)
            return NULL;
      rsk=p7->d.signed_and_enveloped->recipientinfo;
      if (rsk == NULL)
            return NULL;
      ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
      if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
      ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
      return(ri->issuer_and_serial);
      }

ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
      {
      return(get_attribute(si->auth_attr,nid));
      }

ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
      {
      return(get_attribute(si->unauth_attr,nid));
      }

static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
      {
      int i;
      X509_ATTRIBUTE *xa;
      ASN1_OBJECT *o;

      o=OBJ_nid2obj(nid);
      if (!o || !sk) return(NULL);
      for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
            {
            xa=sk_X509_ATTRIBUTE_value(sk,i);
            if (OBJ_cmp(xa->object,o) == 0)
                  {
                  if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
                        return(sk_ASN1_TYPE_value(xa->value.set,0));
                  else
                        return(NULL);
                  }
            }
      return(NULL);
      }

ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
{
      ASN1_TYPE *astype;
      if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
      return astype->value.octet_string;
}

int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
                        STACK_OF(X509_ATTRIBUTE) *sk)
      {
      int i;

      if (p7si->auth_attr != NULL)
            sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
      p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
      if (p7si->auth_attr == NULL)
            return 0;
      for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
            {
            if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
                  X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
                == NULL)
                  return(0);
            }
      return(1);
      }

int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
      {
      int i;

      if (p7si->unauth_attr != NULL)
            sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
                                 X509_ATTRIBUTE_free);
      p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
      if (p7si->unauth_attr == NULL)
            return 0;
      for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
            {
            if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
                        X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
                == NULL)
                  return(0);
            }
      return(1);
      }

int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
           void *value)
      {
      return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
      }

int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
           void *value)
      {
      return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
      }

static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
                   void *value)
      {
      X509_ATTRIBUTE *attr=NULL;

      if (*sk == NULL)
            {
            if (!(*sk = sk_X509_ATTRIBUTE_new_null()))
                  return 0;
new_attrib:
            if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
                  return 0;
            if (!sk_X509_ATTRIBUTE_push(*sk,attr))
                  {
                  X509_ATTRIBUTE_free(attr);
                  return 0;
                  }
            }
      else
            {
            int i;

            for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
                  {
                  attr=sk_X509_ATTRIBUTE_value(*sk,i);
                  if (OBJ_obj2nid(attr->object) == nid)
                        {
                        X509_ATTRIBUTE_free(attr);
                        attr=X509_ATTRIBUTE_create(nid,atrtype,value);
                        if (attr == NULL)
                              return 0;
                        if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
                              {
                              X509_ATTRIBUTE_free(attr);
                              return 0;
                              }
                        goto end;
                        }
                  }
            goto new_attrib;
            }
end:
      return(1);
      }


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