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cms_sd.c

/* crypto/cms/cms_sd.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/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include "cms_lcl.h"
#include "asn1_locl.h"

/* CMS SignedData Utilities */

DECLARE_ASN1_ITEM(CMS_SignedData)

static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
      {
      if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed)
            {
            CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
            return NULL;
            }
      return cms->d.signedData;
      }

static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
      {
      if (cms->d.other == NULL)
            {
            cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
            if (!cms->d.signedData)
                  {
                  CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
                  return NULL;
                  }
            cms->d.signedData->version = 1;
            cms->d.signedData->encapContentInfo->eContentType =
                                    OBJ_nid2obj(NID_pkcs7_data);
            cms->d.signedData->encapContentInfo->partial = 1;
            ASN1_OBJECT_free(cms->contentType);
            cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
            return cms->d.signedData;
            }
      return cms_get0_signed(cms);
      }

/* Just initialize SignedData e.g. for certs only structure */

int CMS_SignedData_init(CMS_ContentInfo *cms)
      {
      if (cms_signed_data_init(cms))
            return 1;
      else
            return 0;
      }

/* Check structures and fixup version numbers (if necessary) */

static void cms_sd_set_version(CMS_SignedData *sd)
      {
      int i;
      CMS_CertificateChoices *cch;
      CMS_RevocationInfoChoice *rch;
      CMS_SignerInfo *si;

      for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++)
            {
            cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
            if (cch->type == CMS_CERTCHOICE_OTHER)
                  {
                  if (sd->version < 5)
                        sd->version = 5;
                  }
            else if (cch->type == CMS_CERTCHOICE_V2ACERT)
                  {
                  if (sd->version < 4)
                        sd->version = 4;
                  }
            else if (cch->type == CMS_CERTCHOICE_V1ACERT)
                  {
                  if (sd->version < 3)
                        sd->version = 3;
                  }
            }

      for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++)
            {
            rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
            if (rch->type == CMS_REVCHOICE_OTHER)
                  {
                  if (sd->version < 5)
                        sd->version = 5;
                  }
            }

      if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
                  && (sd->version < 3))
            sd->version = 3;

      for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
            {
            si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
            if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
                  {
                  if (si->version < 3)
                        si->version = 3;
                  if (sd->version < 3)
                        sd->version = 3;
                  }
            else
                  sd->version = 1;
            }

      if (sd->version < 1)
            sd->version = 1;

      }
      
/* Copy an existing messageDigest value */

static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
      {
      STACK_OF(CMS_SignerInfo) *sinfos;
      CMS_SignerInfo *sitmp;
      int i;
      sinfos = CMS_get0_SignerInfos(cms);
      for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
            {
            ASN1_OCTET_STRING *messageDigest;
            sitmp = sk_CMS_SignerInfo_value(sinfos, i);
            if (sitmp == si)
                  continue;
            if (CMS_signed_get_attr_count(sitmp) < 0)
                  continue;
            if (OBJ_cmp(si->digestAlgorithm->algorithm,
                        sitmp->digestAlgorithm->algorithm))
                  continue;
            messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
                              OBJ_nid2obj(NID_pkcs9_messageDigest),
                              -3, V_ASN1_OCTET_STRING);
            if (!messageDigest)
                  {
                  CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
                        CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
                  return 0;
                  }

            if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
                                    V_ASN1_OCTET_STRING,
                                    messageDigest, -1))
                  return 1;
            else
                  return 0;
            }
            CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
            return 0;
      }

int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
      {
      switch(type)
            {
            case CMS_SIGNERINFO_ISSUER_SERIAL:
            sid->d.issuerAndSerialNumber =
                  M_ASN1_new_of(CMS_IssuerAndSerialNumber);
            if (!sid->d.issuerAndSerialNumber)
                  goto merr;
            if (!X509_NAME_set(&sid->d.issuerAndSerialNumber->issuer,
                              X509_get_issuer_name(cert)))
                  goto merr;
            if (!ASN1_STRING_copy(
                  sid->d.issuerAndSerialNumber->serialNumber,
                        X509_get_serialNumber(cert)))
                  goto merr;
            break;

            case CMS_SIGNERINFO_KEYIDENTIFIER:
            if (!cert->skid)
                  {
                  CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER,
                              CMS_R_CERTIFICATE_HAS_NO_KEYID);
                  return 0;
                  }
            sid->d.subjectKeyIdentifier = ASN1_STRING_dup(cert->skid);
            if (!sid->d.subjectKeyIdentifier)
                  goto merr;
            break;

            default:
            CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
            return 0;
            }

      sid->type = type;

      return 1;

      merr:
      CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, ERR_R_MALLOC_FAILURE);
      return 0;

      }

int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
                              ASN1_OCTET_STRING **keyid,
                              X509_NAME **issuer, ASN1_INTEGER **sno)
      {
      if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
            {
            if (issuer)
                  *issuer = sid->d.issuerAndSerialNumber->issuer;
            if (sno)
                  *sno = sid->d.issuerAndSerialNumber->serialNumber;
            }
      else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
            {
            if (keyid)
                  *keyid = sid->d.subjectKeyIdentifier;
            }
      else
            return 0;
      return 1;
      }

int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
      {
      int ret;
      if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
            {
            ret = X509_NAME_cmp(sid->d.issuerAndSerialNumber->issuer,
                              X509_get_issuer_name(cert));
            if (ret)
                  return ret;
            return ASN1_INTEGER_cmp(sid->d.issuerAndSerialNumber->serialNumber,
                              X509_get_serialNumber(cert));
            }
      else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
            {
            X509_check_purpose(cert, -1, -1);
            if (!cert->skid)
                  return -1;
            return ASN1_OCTET_STRING_cmp(sid->d.subjectKeyIdentifier,
                                          cert->skid);
            }
      else
            return -1;
      }

CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
                  X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
                  unsigned int flags)
      {
      CMS_SignedData *sd;
      CMS_SignerInfo *si = NULL;
      X509_ALGOR *alg;
      int i, type;
      if(!X509_check_private_key(signer, pk))
            {
            CMSerr(CMS_F_CMS_ADD1_SIGNER,
                  CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
                return NULL;
            }
      sd = cms_signed_data_init(cms);
      if (!sd)
            goto err;
      si = M_ASN1_new_of(CMS_SignerInfo);
      if (!si)
            goto merr;
      X509_check_purpose(signer, -1, -1);

      CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
      CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);

      si->pkey = pk;
      si->signer = signer;

      if (flags & CMS_USE_KEYID)
            {
            si->version = 3;
            if (sd->version < 3)
                  sd->version = 3;
            type = CMS_SIGNERINFO_KEYIDENTIFIER;
            }
      else
            {
            type = CMS_SIGNERINFO_ISSUER_SERIAL;
            si->version = 1;
            }

      if (!cms_set1_SignerIdentifier(si->sid, signer, type))
            goto err;

      if (md == NULL)
            {
            int def_nid;
            if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
                  goto err;
            md = EVP_get_digestbynid(def_nid);
            if (md == NULL)
                  {
                  CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
                  goto err;
                  }
            }

      if (!md)
            {
            CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
            goto err;
            }

      cms_DigestAlgorithm_set(si->digestAlgorithm, md);

      /* See if digest is present in digestAlgorithms */
      for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
            {
            ASN1_OBJECT *aoid;
            alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
            X509_ALGOR_get0(&aoid, NULL, NULL, alg);
            if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
                  break;
            }

      if (i == sk_X509_ALGOR_num(sd->digestAlgorithms))
            {
            alg = X509_ALGOR_new();
            if (!alg)
                  goto merr;
            cms_DigestAlgorithm_set(alg, md);
            if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg))
                  {
                  X509_ALGOR_free(alg);
                  goto merr;
                  }
            }

      if (pk->ameth && pk->ameth->pkey_ctrl)
            {
            i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_SIGN,
                                    0, si);
            if (i == -2)
                  {
                  CMSerr(CMS_F_CMS_ADD1_SIGNER,
                        CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
                  goto err;
                  }
            if (i <= 0)
                  {
                  CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_CTRL_FAILURE);
                  goto err;
                  }
            }

      if (!(flags & CMS_NOATTR))
            {
            /* Initialialize signed attributes strutucture so other
             * attributes such as signing time etc are added later
             * even if we add none here.
             */
            if (!si->signedAttrs)
                  {
                  si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
                  if (!si->signedAttrs)
                        goto merr;
                  }

            if (!(flags & CMS_NOSMIMECAP))
                  {
                  STACK_OF(X509_ALGOR) *smcap = NULL;
                  i = CMS_add_standard_smimecap(&smcap);
                  if (i)
                        i = CMS_add_smimecap(si, smcap);
                  sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
                  if (!i)
                        goto merr;
                  }
            if (flags & CMS_REUSE_DIGEST)
                  {
                  if (!cms_copy_messageDigest(cms, si))
                        goto err;
                  if (!(flags & CMS_PARTIAL) &&
                              !CMS_SignerInfo_sign(si))
                        goto err;
                  }
            }

      if (!(flags & CMS_NOCERTS))
            {
            /* NB ignore -1 return for duplicate cert */
            if (!CMS_add1_cert(cms, signer))
                  goto merr;
            }

      if (!sd->signerInfos)
            sd->signerInfos = sk_CMS_SignerInfo_new_null();
      if (!sd->signerInfos ||
            !sk_CMS_SignerInfo_push(sd->signerInfos, si))
            goto merr;

      return si;

      merr:
      CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
      err:
      if (si)
            M_ASN1_free_of(si, CMS_SignerInfo);
      return NULL;

      }

static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
      {
      ASN1_TIME *tt;
      int r = 0;
      if (t)
            tt = t;
      else
            tt = X509_gmtime_adj(NULL, 0);

      if (!tt)
            goto merr;

      if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
                                    tt->type, tt, -1) <= 0)
            goto merr;

      r = 1;

      merr:

      if (!t)
            ASN1_TIME_free(tt);

      if (!r)
            CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);

      return r;

      }

STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
      {
      CMS_SignedData *sd;
      sd = cms_get0_signed(cms);
      if (!sd)
            return NULL;
      return sd->signerInfos;
      }

STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
      {
      STACK_OF(X509) *signers = NULL;
      STACK_OF(CMS_SignerInfo) *sinfos;
      CMS_SignerInfo *si;
      int i;
      sinfos = CMS_get0_SignerInfos(cms);
      for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
            {
            si = sk_CMS_SignerInfo_value(sinfos, i);
            if (si->signer)
                  {
                  if (!signers)
                        {
                        signers = sk_X509_new_null();
                        if (!signers)
                              return NULL;
                        }
                  if (!sk_X509_push(signers, si->signer))
                        {
                        sk_X509_free(signers);
                        return NULL;
                        }
                  }
            }
      return signers;
      }

void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
      {
      if (signer)
            {
            CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
            if (si->pkey)
                  EVP_PKEY_free(si->pkey);
            si->pkey = X509_get_pubkey(signer);
            }
      if (si->signer)
            X509_free(si->signer);
      si->signer = signer;
      }

int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
                              ASN1_OCTET_STRING **keyid,
                              X509_NAME **issuer, ASN1_INTEGER **sno)
      {
      return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
      }

int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
      {
      return cms_SignerIdentifier_cert_cmp(si->sid, cert);
      }

int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
                        unsigned int flags)
      {
      CMS_SignedData *sd;
      CMS_SignerInfo *si;
      CMS_CertificateChoices *cch;
      STACK_OF(CMS_CertificateChoices) *certs;
      X509 *x;
      int i, j;
      int ret = 0;
      sd = cms_get0_signed(cms);
      if (!sd)
            return -1;
      certs = sd->certificates;
      for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
            {
            si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
            if (si->signer)
                  continue;

            for (j = 0; j < sk_X509_num(scerts); j++)
                  {
                  x = sk_X509_value(scerts, j);
                  if (CMS_SignerInfo_cert_cmp(si, x) == 0)
                        {
                        CMS_SignerInfo_set1_signer_cert(si, x);
                        ret++;
                        break;
                        }
                  }

            if (si->signer || (flags & CMS_NOINTERN))
                  continue;

            for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++)
                  {
                  cch = sk_CMS_CertificateChoices_value(certs, j);
                  if (cch->type != 0)
                        continue;
                  x = cch->d.certificate;
                  if (CMS_SignerInfo_cert_cmp(si, x) == 0)
                        {
                        CMS_SignerInfo_set1_signer_cert(si, x);
                        ret++;
                        break;
                        }
                  }
            }
      return ret;
      }

void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk, X509 **signer,
                              X509_ALGOR **pdig, X509_ALGOR **psig)
      {
      if (pk)
            *pk = si->pkey;
      if (signer)
            *signer = si->signer;
      if (pdig)
            *pdig = si->digestAlgorithm;
      if (psig)
            *psig = si->signatureAlgorithm;
      }

static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
                              CMS_SignerInfo *si, BIO *chain)
      {
      EVP_MD_CTX mctx;
      int r = 0;
      EVP_MD_CTX_init(&mctx);


      if (!si->pkey)
            {
            CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
            return 0;
            }

      if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
            goto err;

      /* If any signed attributes calculate and add messageDigest attribute */

      if (CMS_signed_get_attr_count(si) >= 0)
            {
            ASN1_OBJECT *ctype =
                  cms->d.signedData->encapContentInfo->eContentType; 
            unsigned char md[EVP_MAX_MD_SIZE];
            unsigned int mdlen;
            EVP_DigestFinal_ex(&mctx, md, &mdlen);
            if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
                                    V_ASN1_OCTET_STRING,
                                    md, mdlen))
                  goto err;
            /* Copy content type across */
            if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
                              V_ASN1_OBJECT, ctype, -1) <= 0)
                  goto err;
            if (!CMS_SignerInfo_sign(si))
                  goto err;
            }
      else
            {
            unsigned char *sig;
            unsigned int siglen;
            sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
            if (!sig)
                  {
                  CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
                              ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey))
                  {
                  CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
                              CMS_R_SIGNFINAL_ERROR);
                  OPENSSL_free(sig);
                  goto err;
                  }
            ASN1_STRING_set0(si->signature, sig, siglen);
            }

      r = 1;

      err:
      EVP_MD_CTX_cleanup(&mctx);
      return r;

      }

int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
      {
      STACK_OF(CMS_SignerInfo) *sinfos;
      CMS_SignerInfo *si;
      int i;
      sinfos = CMS_get0_SignerInfos(cms);
      for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
            {
            si = sk_CMS_SignerInfo_value(sinfos, i);
            if (!cms_SignerInfo_content_sign(cms, si, chain))
                  return 0;
            }
      cms->d.signedData->encapContentInfo->partial = 0;
      return 1;
      }

int CMS_SignerInfo_sign(CMS_SignerInfo *si)
      {
      EVP_MD_CTX mctx;
      EVP_PKEY_CTX *pctx;
      unsigned char *abuf = NULL;
      int alen;
      size_t siglen;
      const EVP_MD *md = NULL;

      md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
      if (md == NULL)
            return 0;

      EVP_MD_CTX_init(&mctx);

      if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
            {
            if (!cms_add1_signingTime(si, NULL))
                  goto err;
            }

      if (EVP_DigestSignInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
            goto err;

      if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
                        EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0)
            {
            CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
            goto err;
            }

      alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
                        ASN1_ITEM_rptr(CMS_Attributes_Sign));
      if(!abuf)
            goto err;
      if (EVP_DigestSignUpdate(&mctx, abuf, alen) <= 0)
            goto err;
      if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
            goto err;
      OPENSSL_free(abuf);
      abuf = OPENSSL_malloc(siglen);
      if(!abuf)
            goto err;
      if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
            goto err;

      if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
                        EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0)
            {
            CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
            goto err;
            }

      EVP_MD_CTX_cleanup(&mctx);

      ASN1_STRING_set0(si->signature, abuf, siglen);

      return 1;

      err:
      if (abuf)
            OPENSSL_free(abuf);
      EVP_MD_CTX_cleanup(&mctx);
      return 0;

      }

int CMS_SignerInfo_verify(CMS_SignerInfo *si)
      {
      EVP_MD_CTX mctx;
      EVP_PKEY_CTX *pctx;
      unsigned char *abuf = NULL;
      int alen, r = -1;
      const EVP_MD *md = NULL;

      if (!si->pkey)
            {
            CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
            return -1;
            }

      md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
      if (md == NULL)
            return -1;
      EVP_MD_CTX_init(&mctx);
      if (EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
            goto err;

      alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
                        ASN1_ITEM_rptr(CMS_Attributes_Verify));
      if(!abuf)
            goto err;
      r = EVP_DigestVerifyUpdate(&mctx, abuf, alen);
      OPENSSL_free(abuf);
      if (r <= 0)
            {
            r = -1;
            goto err;
            }
      r = EVP_DigestVerifyFinal(&mctx,
                  si->signature->data, si->signature->length);
      if (r <= 0)
            CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
      err:
      EVP_MD_CTX_cleanup(&mctx);
      return r;
      }

/* Create a chain of digest BIOs from a CMS ContentInfo */

BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
      {
      int i;
      CMS_SignedData *sd;
      BIO *chain = NULL;
      sd = cms_get0_signed(cms);
      if (!sd)
            return NULL;
      if (cms->d.signedData->encapContentInfo->partial)
            cms_sd_set_version(sd);
      for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
            {
            X509_ALGOR *digestAlgorithm;
            BIO *mdbio;
            digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
            mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
            if (!mdbio)
                  goto err;   
            if (chain)
                   BIO_push(chain, mdbio);
            else
                  chain = mdbio;
            }
      return chain;
      err:
      if (chain)
            BIO_free_all(chain);
      return NULL;
      }

int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
      {
      ASN1_OCTET_STRING *os = NULL;
      EVP_MD_CTX mctx;
      int r = -1;
      EVP_MD_CTX_init(&mctx);
      /* If we have any signed attributes look for messageDigest value */
      if (CMS_signed_get_attr_count(si) >= 0)
            {
            os = CMS_signed_get0_data_by_OBJ(si,
                              OBJ_nid2obj(NID_pkcs9_messageDigest),
                              -3, V_ASN1_OCTET_STRING);
            if (!os)
                  {
                  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
                        CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
                  goto err;
                  }
            }

      if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
            goto err;

      /* If messageDigest found compare it */

      if (os)
            {
            unsigned char mval[EVP_MAX_MD_SIZE];
            unsigned int mlen;
            if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
                  {
                  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
                        CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
                  goto err;
                  }
            if (mlen != (unsigned int)os->length)
                  {
                  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
                        CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
                  goto err;
                  }

            if (memcmp(mval, os->data, mlen))
                  {
                  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
                        CMS_R_VERIFICATION_FAILURE);
                  r = 0;
                  }
            else
                  r = 1;
            }
      else
            {
            r = EVP_VerifyFinal(&mctx, si->signature->data,
                              si->signature->length, si->pkey);
            if (r <= 0)
                  {
                  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
                        CMS_R_VERIFICATION_FAILURE);
                  r = 0;
                  }
            }

      err:
      EVP_MD_CTX_cleanup(&mctx);
      return r;

      }

int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
      {
      unsigned char *smder = NULL;
      int smderlen, r;
      smderlen = i2d_X509_ALGORS(algs, &smder);
      if (smderlen <= 0)
            return 0;
      r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
                              V_ASN1_SEQUENCE, smder, smderlen);
      OPENSSL_free(smder);
      return r;
      }

int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
                        int algnid, int keysize)
      {
      X509_ALGOR *alg;
      ASN1_INTEGER *key = NULL;
      if (keysize > 0)
            {
            key = ASN1_INTEGER_new();
            if (!key || !ASN1_INTEGER_set(key, keysize))
                  return 0;
            }
      alg = X509_ALGOR_new();
      if (!alg)
            {
            if (key)
                  ASN1_INTEGER_free(key);
            return 0;
            }
            
      X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
                        key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
      if (!*algs)
            *algs = sk_X509_ALGOR_new_null();
      if (!*algs || !sk_X509_ALGOR_push(*algs, alg))
            {
            X509_ALGOR_free(alg);
            return 0;
            }
      return 1;
      }

/* Check to see if a cipher exists and if so add S/MIME capabilities */

static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
      {
      if (EVP_get_cipherbynid(nid))
            return CMS_add_simple_smimecap(sk, nid, arg);
      return 1;
      }

static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
      {
      if (EVP_get_digestbynid(nid))
            return CMS_add_simple_smimecap(sk, nid, arg);
      return 1;
      }

int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
      {
      if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
            || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
            || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
            || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
            || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
            || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
            || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
            || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
            || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
            || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
            return 0;
      return 1;
      }

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