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cms_smime.c

/* crypto/cms/cms_smime.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 */

#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include "cms_lcl.h"

static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
      {
      unsigned char buf[4096];
      int r = 0, i;
      BIO *tmpout = NULL;

      if (out == NULL)
            tmpout = BIO_new(BIO_s_null());
      else if (flags & CMS_TEXT)
            {
            tmpout = BIO_new(BIO_s_mem());
            BIO_set_mem_eof_return(tmpout, 0);
            }
      else
            tmpout = out;

      if(!tmpout)
            {
            CMSerr(CMS_F_CMS_COPY_CONTENT,ERR_R_MALLOC_FAILURE);
            goto err;
            }

      /* Read all content through chain to process digest, decrypt etc */
      for (;;)
      {
            i=BIO_read(in,buf,sizeof(buf));
            if (i <= 0)
                  {
                  if (BIO_method_type(in) == BIO_TYPE_CIPHER)
                        {
                        if (!BIO_get_cipher_status(in))
                              goto err;
                        }
                  if (i < 0)
                        goto err;
                  break;
                  }
                        
            if (tmpout && (BIO_write(tmpout, buf, i) != i))
                  goto err;
      }

      if(flags & CMS_TEXT)
            {
            if(!SMIME_text(tmpout, out))
                  {
                  CMSerr(CMS_F_CMS_COPY_CONTENT,CMS_R_SMIME_TEXT_ERROR);
                  goto err;
                  }
            }

      r = 1;

      err:
      if (tmpout && (tmpout != out))
            BIO_free(tmpout);
      return r;

      }

static int check_content(CMS_ContentInfo *cms)
      {
      ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
      if (!pos || !*pos)
            {
            CMSerr(CMS_F_CHECK_CONTENT, CMS_R_NO_CONTENT);
            return 0;
            }
      return 1;
      }

static void do_free_upto(BIO *f, BIO *upto)
      {
      if (upto)
            {
            BIO *tbio;
            do 
                  {
                  tbio = BIO_pop(f);
                  BIO_free(f);
                  f = tbio;
                  }
            while (f != upto);
            }
      else
            BIO_free_all(f);
      }

int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
      {
      BIO *cont;
      int r;
      if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data)
            {
            CMSerr(CMS_F_CMS_DATA, CMS_R_TYPE_NOT_DATA);
            return 0;
            }
      cont = CMS_dataInit(cms, NULL);
      if (!cont)
            return 0;
      r = cms_copy_content(out, cont, flags);
      BIO_free_all(cont);
      return r;
      }

CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
      {
      CMS_ContentInfo *cms;
      cms = cms_Data_create();
      if (!cms)
            return NULL;

      if (CMS_final(cms, in, NULL, flags))
            return cms;

      CMS_ContentInfo_free(cms);

      return NULL;
      }

int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
                                          unsigned int flags)
      {
      BIO *cont;
      int r;
      if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest)
            {
            CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_TYPE_NOT_DIGESTED_DATA);
            return 0;
            }

      if (!dcont && !check_content(cms))
            return 0;

      cont = CMS_dataInit(cms, dcont);
      if (!cont)
            return 0;
      r = cms_copy_content(out, cont, flags);
      if (r)
            r = cms_DigestedData_do_final(cms, cont, 1);
      do_free_upto(cont, dcont);
      return r;
      }

CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
                              unsigned int flags)
      {
      CMS_ContentInfo *cms;
      if (!md)
            md = EVP_sha1();
      cms = cms_DigestedData_create(md);
      if (!cms)
            return NULL;

      if(!(flags & CMS_DETACHED))
            {
            flags &= ~CMS_STREAM;
            CMS_set_detached(cms, 0);
            }

      if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
            return cms;

      CMS_ContentInfo_free(cms);
      return NULL;
      }

int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
                        const unsigned char *key, size_t keylen,
                        BIO *dcont, BIO *out, unsigned int flags)
      {
      BIO *cont;
      int r;
      if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted)
            {
            CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
                              CMS_R_TYPE_NOT_ENCRYPTED_DATA);
            return 0;
            }

      if (!dcont && !check_content(cms))
            return 0;

      if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
            return 0;
      cont = CMS_dataInit(cms, dcont);
      if (!cont)
            return 0;
      r = cms_copy_content(out, cont, flags);
      do_free_upto(cont, dcont);
      return r;
      }

CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
                              const unsigned char *key, size_t keylen,
                              unsigned int flags)
      {
      CMS_ContentInfo *cms;
      if (!cipher)
            {
            CMSerr(CMS_F_CMS_ENCRYPTEDDATA_ENCRYPT, CMS_R_NO_CIPHER);
            return NULL;
            }
      cms = CMS_ContentInfo_new();
      if (!cms)
            return NULL;
      if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
            return NULL;

      if(!(flags & CMS_DETACHED))
            {
            flags &= ~CMS_STREAM;
            CMS_set_detached(cms, 0);
            }

      if ((flags & (CMS_STREAM|CMS_PARTIAL))
            || CMS_final(cms, in, NULL, flags))
            return cms;

      CMS_ContentInfo_free(cms);
      return NULL;
      }

static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
                              X509_STORE *store,
                              STACK_OF(X509) *certs,
                              STACK_OF(X509_CRL) *crls,
                              unsigned int flags)
      {
      X509_STORE_CTX ctx;
      X509 *signer;
      int i, j, r = 0;
      CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
      if (!X509_STORE_CTX_init(&ctx, store, signer, certs))
            {
            CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
                                    CMS_R_STORE_INIT_ERROR);
            goto err;
            }
      X509_STORE_CTX_set_default(&ctx, "smime_sign");
      if (crls)
            X509_STORE_CTX_set0_crls(&ctx, crls);

      i = X509_verify_cert(&ctx);
      if (i <= 0)
            {
            j = X509_STORE_CTX_get_error(&ctx);
            CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
                                    CMS_R_CERTIFICATE_VERIFY_ERROR);
            ERR_add_error_data(2, "Verify error:",
                               X509_verify_cert_error_string(j));
            goto err;
            }
      r = 1;
      err:
      X509_STORE_CTX_cleanup(&ctx);
      return r;

      }

int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
             X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
      {
      CMS_SignerInfo *si;
      STACK_OF(CMS_SignerInfo) *sinfos;
      STACK_OF(X509) *cms_certs = NULL;
      STACK_OF(X509_CRL) *crls = NULL;
      X509 *signer;
      int i, scount = 0, ret = 0;
      BIO *cmsbio = NULL, *tmpin = NULL;

      if (!dcont && !check_content(cms))
            return 0;

      /* Attempt to find all signer certificates */

      sinfos = CMS_get0_SignerInfos(cms);

      if (sk_CMS_SignerInfo_num(sinfos) <= 0)
            {
            CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
            goto err;
            }

      for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
            {
            si = sk_CMS_SignerInfo_value(sinfos, i);
            CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
            if (signer)
                  scount++;
            }

      if (scount != sk_CMS_SignerInfo_num(sinfos))
            scount += CMS_set1_signers_certs(cms, certs, flags);

      if (scount != sk_CMS_SignerInfo_num(sinfos))
            {
            CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
            goto err;
            }

      /* Attempt to verify all signers certs */

      if (!(flags & CMS_NO_SIGNER_CERT_VERIFY))
            {
            cms_certs = CMS_get1_certs(cms);
            if (!(flags & CMS_NOCRL))
                  crls = CMS_get1_crls(cms);
            for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
                  {
                  si = sk_CMS_SignerInfo_value(sinfos, i);
                  if (!cms_signerinfo_verify_cert(si, store,
                                          cms_certs, crls, flags))
                        goto err;
                  }
            }

      /* Attempt to verify all SignerInfo signed attribute signatures */

      if (!(flags & CMS_NO_ATTR_VERIFY))
            {
            for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
                  {
                  si = sk_CMS_SignerInfo_value(sinfos, i);
                  if (CMS_signed_get_attr_count(si) < 0)
                        continue;
                  if (CMS_SignerInfo_verify(si) <= 0)
                        goto err;
                  }
            }

      /* Performance optimization: if the content is a memory BIO then
       * store its contents in a temporary read only memory BIO. This
       * avoids potentially large numbers of slow copies of data which will
       * occur when reading from a read write memory BIO when signatures
       * are calculated.
       */

      if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM))
            {
            char *ptr;
            long len;
            len = BIO_get_mem_data(dcont, &ptr);
            tmpin = BIO_new_mem_buf(ptr, len);
            if (tmpin == NULL)
                  {
                  CMSerr(CMS_F_CMS_VERIFY,ERR_R_MALLOC_FAILURE);
                  return 0;
                  }
            }
      else
            tmpin = dcont;
            

      cmsbio=CMS_dataInit(cms, tmpin);
      if (!cmsbio)
            goto err;

      if (!cms_copy_content(out, cmsbio, flags))
            goto err;

      if (!(flags & CMS_NO_CONTENT_VERIFY))
            {
            for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
                  {
                  si = sk_CMS_SignerInfo_value(sinfos, i);
                  if (CMS_SignerInfo_verify_content(si, cmsbio) <= 0)
                        {
                        CMSerr(CMS_F_CMS_VERIFY,
                              CMS_R_CONTENT_VERIFY_ERROR);
                        goto err;
                        }
                  }
            }

      ret = 1;

      err:
      
      if (dcont && (tmpin == dcont))
            do_free_upto(cmsbio, dcont);
      else
            BIO_free_all(cmsbio);

      if (cms_certs)
            sk_X509_pop_free(cms_certs, X509_free);
      if (crls)
            sk_X509_CRL_pop_free(crls, X509_CRL_free);

      return ret;
      }

int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
                  STACK_OF(X509) *certs,
                  X509_STORE *store, unsigned int flags)
      {
      int r;
      r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
      if (r <= 0)
            return r;
      return cms_Receipt_verify(rcms, ocms);
      }

CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
                                    BIO *data, unsigned int flags)
      {
      CMS_ContentInfo *cms;
      int i;

      cms = CMS_ContentInfo_new();
      if (!cms || !CMS_SignedData_init(cms))
            goto merr;

      if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags))
            {
            CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
            goto err;
            }

      for (i = 0; i < sk_X509_num(certs); i++)
            {
            X509 *x = sk_X509_value(certs, i);
            if (!CMS_add1_cert(cms, x))
                  goto merr;
            }

      if(!(flags & CMS_DETACHED))
            {
            flags &= ~CMS_STREAM;
            CMS_set_detached(cms, 0);
            }

      if ((flags & (CMS_STREAM|CMS_PARTIAL))
            || CMS_final(cms, data, NULL, flags))
            return cms;
      else
            goto err;

      merr:
      CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);

      err:
      if (cms)
            CMS_ContentInfo_free(cms);
      return NULL;
      }

CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
                              X509 *signcert, EVP_PKEY *pkey,
                              STACK_OF(X509) *certs,
                              unsigned int flags)
      {
      CMS_SignerInfo *rct_si;
      CMS_ContentInfo *cms = NULL;
      ASN1_OCTET_STRING **pos, *os;
      BIO *rct_cont = NULL;
      int r = 0;

      flags &= ~CMS_STREAM;
      /* Not really detached but avoids content being allocated */
      flags |= CMS_PARTIAL|CMS_BINARY|CMS_DETACHED;
      if (!pkey || !signcert)
            {
            CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_NO_KEY_OR_CERT);
            return NULL;
            }

      /* Initialize signed data */

      cms = CMS_sign(NULL, NULL, certs, NULL, flags);
      if (!cms)
            goto err;

      /* Set inner content type to signed receipt */
      if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
            goto err;

      rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
      if (!rct_si)
            {
            CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_ADD_SIGNER_ERROR);
            goto err;
            }

      os = cms_encode_Receipt(si);

      if (!os)
            goto err;

      /* Set content to digest */
      rct_cont = BIO_new_mem_buf(os->data, os->length);
      if (!rct_cont)
            goto err;

      /* Add msgSigDigest attribute */

      if (!cms_msgSigDigest_add1(rct_si, si))
            goto err;

      /* Finalize structure */
      if (!CMS_final(cms, rct_cont, NULL, flags))
            goto err;

      /* Set embedded content */
      pos = CMS_get0_content(cms);
      *pos = os;

      r = 1;

      err:
      if (rct_cont)
            BIO_free(rct_cont);
      if (r)
            return cms;
      CMS_ContentInfo_free(cms);
      return NULL;

      }

CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
                        const EVP_CIPHER *cipher, unsigned int flags)
      {
      CMS_ContentInfo *cms;
      int i;
      X509 *recip;
      cms = CMS_EnvelopedData_create(cipher);
      if (!cms)
            goto merr;
      for (i = 0; i < sk_X509_num(certs); i++)
            {
            recip = sk_X509_value(certs, i);
            if (!CMS_add1_recipient_cert(cms, recip, flags))
                  {
                  CMSerr(CMS_F_CMS_ENCRYPT, CMS_R_RECIPIENT_ERROR);
                  goto err;
                  }
            }

      if(!(flags & CMS_DETACHED))
            {
            flags &= ~CMS_STREAM;
            CMS_set_detached(cms, 0);
            }

      if ((flags & (CMS_STREAM|CMS_PARTIAL))
            || CMS_final(cms, data, NULL, flags))
            return cms;
      else
            goto err;

      merr:
      CMSerr(CMS_F_CMS_ENCRYPT, ERR_R_MALLOC_FAILURE);
      err:
      if (cms)
            CMS_ContentInfo_free(cms);
      return NULL;
      }

int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
      {
      STACK_OF(CMS_RecipientInfo) *ris;
      CMS_RecipientInfo *ri;
      int i, r;
      ris = CMS_get0_RecipientInfos(cms);
      for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
            {
            ri = sk_CMS_RecipientInfo_value(ris, i);
            if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_TRANS)
                        continue;
            /* If we have a cert try matching RecipientInfo
             * otherwise try them all.
             */
            if (!cert || (CMS_RecipientInfo_ktri_cert_cmp(ri, cert) == 0))
                  {
                  CMS_RecipientInfo_set0_pkey(ri, pk);
                  r = CMS_RecipientInfo_decrypt(cms, ri);
                  CMS_RecipientInfo_set0_pkey(ri, NULL);
                  if (r > 0)
                        return 1;
                  if (cert)
                        {
                        CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY,
                                    CMS_R_DECRYPT_ERROR);
                        return 0;
                        }
                  ERR_clear_error();
                  }
            }

      CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY, CMS_R_NO_MATCHING_RECIPIENT);
      return 0;

      }

int CMS_decrypt_set1_key(CMS_ContentInfo *cms, 
                        unsigned char *key, size_t keylen,
                        unsigned char *id, size_t idlen)
      {
      STACK_OF(CMS_RecipientInfo) *ris;
      CMS_RecipientInfo *ri;
      int i, r;
      ris = CMS_get0_RecipientInfos(cms);
      for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
            {
            ri = sk_CMS_RecipientInfo_value(ris, i);
            if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
                        continue;

            /* If we have an id try matching RecipientInfo
             * otherwise try them all.
             */
            if (!id || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0))
                  {
                  CMS_RecipientInfo_set0_key(ri, key, keylen);
                  r = CMS_RecipientInfo_decrypt(cms, ri);
                  CMS_RecipientInfo_set0_key(ri, NULL, 0);
                  if (r > 0)
                        return 1;
                  if (id)
                        {
                        CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY,
                                    CMS_R_DECRYPT_ERROR);
                        return 0;
                        }
                  ERR_clear_error();
                  }
            }

      CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY, CMS_R_NO_MATCHING_RECIPIENT);
      return 0;

      }
      
int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
                        BIO *dcont, BIO *out,
                        unsigned int flags)
      {
      int r;
      BIO *cont;
      if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped)
            {
            CMSerr(CMS_F_CMS_DECRYPT, CMS_R_TYPE_NOT_ENVELOPED_DATA);
            return 0;
            }
      if (!dcont && !check_content(cms))
            return 0;
      if (pk && !CMS_decrypt_set1_pkey(cms, pk, cert))
            return 0;

      cont = CMS_dataInit(cms, dcont);
      if (!cont)
            return 0;
      r = cms_copy_content(out, cont, flags);
      do_free_upto(cont, dcont);
      return r;
      }

int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
      {
      BIO *cmsbio;
      int ret = 0;
      if (!(cmsbio = CMS_dataInit(cms, dcont)))
            {
            CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE);
            return 0;
            }

      SMIME_crlf_copy(data, cmsbio, flags);

      (void)BIO_flush(cmsbio);


        if (!CMS_dataFinal(cms, cmsbio))
            {
            CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR);
            goto err;
            }

      ret = 1;

      err:
      do_free_upto(cmsbio, dcont);

      return ret;

      }

#ifdef ZLIB

int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
                                          unsigned int flags)
      {
      BIO *cont;
      int r;
      if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData)
            {
            CMSerr(CMS_F_CMS_UNCOMPRESS,
                              CMS_R_TYPE_NOT_COMPRESSED_DATA);
            return 0;
            }

      if (!dcont && !check_content(cms))
            return 0;

      cont = CMS_dataInit(cms, dcont);
      if (!cont)
            return 0;
      r = cms_copy_content(out, cont, flags);
      do_free_upto(cont, dcont);
      return r;
      }

CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
      {
      CMS_ContentInfo *cms;
      if (comp_nid <= 0)
            comp_nid = NID_zlib_compression;
      cms = cms_CompressedData_create(comp_nid);
      if (!cms)
            return NULL;

      if(!(flags & CMS_DETACHED))
            {
            flags &= ~CMS_STREAM;
            CMS_set_detached(cms, 0);
            }

      if (CMS_final(cms, in, NULL, flags))
            return cms;

      CMS_ContentInfo_free(cms);
      return NULL;
      }

#else

int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
                                          unsigned int flags)
      {
      CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
      return 0;
      }

CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
      {
      CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
      return NULL;
      }

#endif

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