text: /*
   * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include "internal/cryptlib.h"
  #include <openssl/asn1t.h>
  #include <openssl/pem.h>
  #include <openssl/x509.h>
  #include <openssl/x509v3.h>
  #include <openssl/err.h>
  #include <openssl/cms.h>
  #include <openssl/ess.h>
  #include "internal/sizes.h"
  #include "crypto/asn1.h"
  #include "crypto/evp.h"
  #include "crypto/ess.h"
  #include "crypto/x509.h" /* for ossl_x509_add_cert_new() */
  #include "cms_local.h"
  
  /* CMS SignedData Utilities */
  
  static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
  {
      if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
          ERR_raise(ERR_LIB_CMS, 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) {
              ERR_raise(ERR_LIB_CMS, 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 initialise 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 if (si->version < 1)
              si->version = 1;
      }
  
      if (sd->version < 1)
          sd->version = 1;
  
  }
  
  /*
   * RFC 5652 Section 11.1 Content Type
   * The content-type attribute within signed-data MUST
   *   1) be present if there are signed attributes
   *   2) match the content type in the signed-data,
   *   3) be a signed attribute.
   *   4) not have more than one copy of the attribute.
   *
   * Note that since the CMS_SignerInfo_sign() always adds the "signing time"
   * attribute, the content type attribute MUST be added also.
   * Assumptions: This assumes that the attribute does not already exist.
   */
  static int cms_set_si_contentType_attr(CMS_ContentInfo *cms, CMS_SignerInfo *si)
  {
      ASN1_OBJECT *ctype = cms->d.signedData->encapContentInfo->eContentType;
  
      /* Add the contentType attribute */
      return CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
                                         V_ASN1_OBJECT, ctype, -1) > 0;
  }
  
  /* 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) {
              ERR_raise(ERR_LIB_CMS, 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;
      }
      ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_DIGEST);
      return 0;
  }
  
  int ossl_cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert,
                                     int type, const CMS_CTX *ctx)
  {
      switch (type) {
      case CMS_SIGNERINFO_ISSUER_SERIAL:
          if (!ossl_cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
              return 0;
          break;
  
      case CMS_SIGNERINFO_KEYIDENTIFIER:
          if (!ossl_cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
              return 0;
          break;
  
      default:
          ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_ID);
          return 0;
      }
  
      sid->type = type;
  
      return 1;
  }
  
  int ossl_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 ossl_cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
  {
      if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
          return ossl_cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
      else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
          return ossl_cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
      else
          return -1;
  }
  
  /* Method to map any, incl. provider-implemented PKEY types to OIDs */
  /* ECDSA and DSA and all provider-delivered signatures implementation is the same */
  static int cms_generic_sign(CMS_SignerInfo *si, int verify)
  {
      if (!ossl_assert(verify == 0 || verify == 1))
          return -1;
  
      if (!verify) {
          int snid, hnid, pknid;
          X509_ALGOR *alg1, *alg2;
          EVP_PKEY *pkey = si->pkey;
          pknid = EVP_PKEY_get_id(pkey);
  
          CMS_SignerInfo_get0_algs(si, NULL, NULL, &alg1, &alg2);
          if (alg1 == NULL || alg1->algorithm == NULL)
              return -1;
          hnid = OBJ_obj2nid(alg1->algorithm);
          if (hnid == NID_undef)
              return -1;
          if (pknid <= 0) { /* check whether a provider registered a NID */
              const char *typename = EVP_PKEY_get0_type_name(pkey);
              if (typename != NULL)
                  pknid = OBJ_txt2nid(typename);
          }
          if (!OBJ_find_sigid_by_algs(&snid, hnid, pknid))
              return -1;
          return X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, NULL);
      }
      return 1;
  }
  
  static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
  {
      EVP_PKEY *pkey = si->pkey;
      int i;
  
      if (EVP_PKEY_is_a(pkey, "DSA") || EVP_PKEY_is_a(pkey, "EC"))
          return cms_generic_sign(si, cmd);
      else if (EVP_PKEY_is_a(pkey, "RSA") || EVP_PKEY_is_a(pkey, "RSA-PSS"))
          return ossl_cms_rsa_sign(si, cmd);
  
      /* Now give engines, providers, etc a chance to handle this */
      if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
          return cms_generic_sign(si, cmd);
      i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
      if (i == -2) {
          ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
          return 0;
      }
      if (i <= 0) {
          ERR_raise(ERR_LIB_CMS, CMS_R_CTRL_FAILURE);
          return 0;
      }
      return 1;
  }
  
  /* Add SigningCertificate signed attribute to the signer info. */
  static int ossl_cms_add1_signing_cert(CMS_SignerInfo *si,
                                        const ESS_SIGNING_CERT *sc)
  {
      ASN1_STRING *seq = NULL;
      unsigned char *p, *pp = NULL;
      int ret, len = i2d_ESS_SIGNING_CERT(sc, NULL);
  
      if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
          return 0;
  
      p = pp;
      i2d_ESS_SIGNING_CERT(sc, &p);
      if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
          ASN1_STRING_free(seq);
          OPENSSL_free(pp);
          return 0;
      }
      OPENSSL_free(pp);
      ret = CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificate,
                                        V_ASN1_SEQUENCE, seq, -1);
      ASN1_STRING_free(seq);
      return ret;
  }
  
  /* Add SigningCertificateV2 signed attribute to the signer info. */
  static int ossl_cms_add1_signing_cert_v2(CMS_SignerInfo *si,
                                           const ESS_SIGNING_CERT_V2 *sc)
  {
      ASN1_STRING *seq = NULL;
      unsigned char *p, *pp = NULL;
      int ret, len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
  
      if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
          return 0;
  
      p = pp;
      i2d_ESS_SIGNING_CERT_V2(sc, &p);
      if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
          ASN1_STRING_free(seq);
          OPENSSL_free(pp);
          return 0;
      }
      OPENSSL_free(pp);
      ret = CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificateV2,
                                        V_ASN1_SEQUENCE, seq, -1);
      ASN1_STRING_free(seq);
      return ret;
  }
  
  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;
      const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
  
      if (!X509_check_private_key(signer, pk)) {
          ERR_raise(ERR_LIB_CMS, 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;
      /* Call for side-effect of computing hash and caching extensions */
      X509_check_purpose(signer, -1, -1);
  
      X509_up_ref(signer);
      EVP_PKEY_up_ref(pk);
  
      si->cms_ctx = ctx;
      si->pkey = pk;
      si->signer = signer;
      si->mctx = EVP_MD_CTX_new();
      si->pctx = NULL;
  
      if (si->mctx == NULL) {
          ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      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 (!ossl_cms_set1_SignerIdentifier(si->sid, signer, type, ctx))
          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) {
              ERR_raise(ERR_LIB_CMS, CMS_R_NO_DEFAULT_DIGEST);
              goto err;
          }
      }
  
      if (md == NULL) {
          ERR_raise(ERR_LIB_CMS, CMS_R_NO_DIGEST_SET);
          goto err;
      }
  
      X509_ALGOR_set_md(si->digestAlgorithm, md);
  
      /* See if digest is present in digestAlgorithms */
      for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
          const ASN1_OBJECT *aoid;
          char name[OSSL_MAX_NAME_SIZE];
  
          alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
          X509_ALGOR_get0(&aoid, NULL, NULL, alg);
          OBJ_obj2txt(name, sizeof(name), aoid, 0);
          if (EVP_MD_is_a(md, name))
              break;
      }
  
      if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
          if ((alg = X509_ALGOR_new()) == NULL)
              goto merr;
          X509_ALGOR_set_md(alg, md);
          if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
              X509_ALGOR_free(alg);
              goto merr;
          }
      }
  
      if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
          goto err;
      if (!(flags & CMS_NOATTR)) {
          /*
           * Initialize signed attributes structure 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_CADES) {
              ESS_SIGNING_CERT *sc = NULL;
              ESS_SIGNING_CERT_V2 *sc2 = NULL;
              int add_sc;
  
              if (md == NULL || EVP_MD_is_a(md, SN_sha1)) {
                  if ((sc = OSSL_ESS_signing_cert_new_init(signer,
                                                           NULL, 1)) == NULL)
                      goto err;
                  add_sc = ossl_cms_add1_signing_cert(si, sc);
                  ESS_SIGNING_CERT_free(sc);
              } else {
                  if ((sc2 = OSSL_ESS_signing_cert_v2_new_init(md, signer,
                                                               NULL, 1)) == NULL)
                      goto err;
                  add_sc = ossl_cms_add1_signing_cert_v2(si, sc2);
                  ESS_SIGNING_CERT_V2_free(sc2);
              }
              if (!add_sc)
                  goto err;
          }
          if (flags & CMS_REUSE_DIGEST) {
              if (!cms_copy_messageDigest(cms, si))
                  goto err;
              if (!cms_set_si_contentType_attr(cms, si))
                  goto err;
              if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
                  !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 (flags & CMS_KEY_PARAM) {
          if (flags & CMS_NOATTR) {
              si->pctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
                                                    si->pkey,
                                                    ossl_cms_ctx_get0_propq(ctx));
              if (si->pctx == NULL)
                  goto err;
              if (EVP_PKEY_sign_init(si->pctx) <= 0)
                  goto err;
              if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
                  goto err;
          } else if (EVP_DigestSignInit_ex(si->mctx, &si->pctx,
                                           EVP_MD_get0_name(md),
                                           ossl_cms_ctx_get0_libctx(ctx),
                                           ossl_cms_ctx_get0_propq(ctx),
                                           pk, NULL) <= 0) {
              goto err;
          }
      }
  
      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:
      ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
   err:
      M_ASN1_free_of(si, CMS_SignerInfo);
      return NULL;
  
  }
  
  void ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo *cms)
  {
      int i;
      CMS_SignerInfo *si;
      STACK_OF(CMS_SignerInfo) *sinfos;
      const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
  
      ERR_set_mark();
      sinfos = CMS_get0_SignerInfos(cms);
      ERR_pop_to_mark(); /* removes error in case sinfos == NULL */
  
      for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
          si = sk_CMS_SignerInfo_value(sinfos, i);
          if (si != NULL)
              si->cms_ctx = ctx;
      }
  }
  
  static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
  {
      ASN1_TIME *tt;
      int r = 0;
  
      if (t != NULL)
          tt = t;
      else
          tt = X509_gmtime_adj(NULL, 0);
  
      if (tt == NULL)
          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 == NULL)
          ASN1_TIME_free(tt);
  
      if (!r)
          ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
  
      return r;
  
  }
  
  EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
  {
      return si->pctx;
  }
  
  EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
  {
      return si->mctx;
  }
  
  STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
  {
      CMS_SignedData *sd = cms_get0_signed(cms);
  
      return sd != NULL ? sd->signerInfos : NULL;
  }
  
  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 != NULL) {
              if (!ossl_x509_add_cert_new(&signers, si->signer,
                                          X509_ADD_FLAG_DEFAULT)) {
                  sk_X509_free(signers);
                  return NULL;
              }
          }
      }
      return signers;
  }
  
  void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
  {
      if (signer != NULL) {
          X509_up_ref(signer);
          EVP_PKEY_free(si->pkey);
          si->pkey = X509_get_pubkey(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 ossl_cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
  }
  
  int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
  {
      return ossl_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 == NULL)
          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 != NULL)
              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 != NULL || (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 != NULL)
          *pk = si->pkey;
      if (signer != NULL)
          *signer = si->signer;
      if (pdig != NULL)
          *pdig = si->digestAlgorithm;
      if (psig != NULL)
          *psig = si->signatureAlgorithm;
  }
  
  ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
  {
      return si->signature;
  }
  
  static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
                                         CMS_SignerInfo *si, BIO *chain)
  {
      EVP_MD_CTX *mctx = EVP_MD_CTX_new();
      int r = 0;
      EVP_PKEY_CTX *pctx = NULL;
      const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
  
      if (mctx == NULL) {
          ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      if (si->pkey == NULL) {
          ERR_raise(ERR_LIB_CMS, CMS_R_NO_PRIVATE_KEY);
          goto err;
      }
  
      if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
          goto err;
      /* Set SignerInfo algorithm details if we used custom parameter */
      if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
          goto err;
  
      /*
       * If any signed attributes calculate and add messageDigest attribute
       */
  
      if (CMS_signed_get_attr_count(si) >= 0) {
          unsigned char md[EVP_MAX_MD_SIZE];
          unsigned int mdlen;
  
          if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
              goto err;
          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_set_si_contentType_attr(cms, si))
              goto err;
  
          if (!CMS_SignerInfo_sign(si))
              goto err;
      } else if (si->pctx) {
          unsigned char *sig;
          size_t siglen;
          unsigned char md[EVP_MAX_MD_SIZE];
          unsigned int mdlen;
  
          pctx = si->pctx;
          if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
              goto err;
          siglen = EVP_PKEY_get_size(si->pkey);
          sig = OPENSSL_malloc(siglen);
          if (sig == NULL) {
              ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
              goto err;
          }
          if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
              OPENSSL_free(sig);
              goto err;
          }
          ASN1_STRING_set0(si->signature, sig, siglen);
      } else {
          unsigned char *sig;
          unsigned int siglen;
  
          sig = OPENSSL_malloc(EVP_PKEY_get_size(si->pkey));
          if (sig == NULL) {
              ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
              goto err;
          }
          if (!EVP_SignFinal_ex(mctx, sig, &siglen, si->pkey,
                                ossl_cms_ctx_get0_libctx(ctx),
                                ossl_cms_ctx_get0_propq(ctx))) {
              ERR_raise(ERR_LIB_CMS, CMS_R_SIGNFINAL_ERROR);
              OPENSSL_free(sig);
              goto err;
          }
          ASN1_STRING_set0(si->signature, sig, siglen);
      }
  
      r = 1;
  
   err:
      EVP_MD_CTX_free(mctx);
      EVP_PKEY_CTX_free(pctx);
      return r;
  
  }
  
  int ossl_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 = si->mctx;
      EVP_PKEY_CTX *pctx = NULL;
      unsigned char *abuf = NULL;
      int alen;
      size_t siglen;
      const CMS_CTX *ctx = si->cms_ctx;
      char md_name[OSSL_MAX_NAME_SIZE];
  
      if (OBJ_obj2txt(md_name, sizeof(md_name),
                       si->digestAlgorithm->algorithm, 0) <= 0)
          return 0;
  
      if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
          if (!cms_add1_signingTime(si, NULL))
              goto err;
      }
  
      if (!ossl_cms_si_check_attributes(si))
          goto err;
  
      if (si->pctx)
          pctx = si->pctx;
      else {
          EVP_MD_CTX_reset(mctx);
          if (EVP_DigestSignInit_ex(mctx, &pctx, md_name,
                                    ossl_cms_ctx_get0_libctx(ctx),
                                    ossl_cms_ctx_get0_propq(ctx), si->pkey,
                                    NULL) <= 0)
              goto err;
          si->pctx = pctx;
      }
  
      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 == NULL)
          goto err;
      if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
          goto err;
  
      EVP_MD_CTX_reset(mctx);
  
      ASN1_STRING_set0(si->signature, abuf, siglen);
  
      return 1;
  
   err:
      OPENSSL_free(abuf);
      EVP_MD_CTX_reset(mctx);
      return 0;
  }
  
  int CMS_SignerInfo_verify(CMS_SignerInfo *si)
  {
      EVP_MD_CTX *mctx = NULL;
      unsigned char *abuf = NULL;
      int alen, r = -1;
      char name[OSSL_MAX_NAME_SIZE];
      const EVP_MD *md;
      EVP_MD *fetched_md = NULL;
      const CMS_CTX *ctx = si->cms_ctx;
      OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(ctx);
      const char *propq = ossl_cms_ctx_get0_propq(ctx);
  
      if (si->pkey == NULL) {
          ERR_raise(ERR_LIB_CMS, CMS_R_NO_PUBLIC_KEY);
          return -1;
      }
  
      if (!ossl_cms_si_check_attributes(si))
          return -1;
  
      OBJ_obj2txt(name, sizeof(name), si->digestAlgorithm->algorithm, 0);
  
      (void)ERR_set_mark();
      fetched_md = EVP_MD_fetch(libctx, name, propq);
  
      if (fetched_md != NULL)
          md = fetched_md;
      else
          md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
      if (md == NULL) {
          (void)ERR_clear_last_mark();
          ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_DIGEST_ALGORITHM);
          return -1;
      }
      (void)ERR_pop_to_mark();
  
      if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
          ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
          goto err;
      }
      mctx = si->mctx;
      if (EVP_DigestVerifyInit_ex(mctx, &si->pctx, EVP_MD_get0_name(md), libctx,
                                  propq, si->pkey, NULL) <= 0)
          goto err;
  
      if (!cms_sd_asn1_ctrl(si, 1))
          goto err;
  
      alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
                           ASN1_ITEM_rptr(CMS_Attributes_Verify));
      if (abuf == NULL || alen < 0)
          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)
          ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
   err:
      EVP_MD_free(fetched_md);
      EVP_MD_CTX_reset(mctx);
      return r;
  }
  
  /* Create a chain of digest BIOs from a CMS ContentInfo */
  
  BIO *ossl_cms_SignedData_init_bio(CMS_ContentInfo *cms)
  {
      int i;
      CMS_SignedData *sd;
      BIO *chain = NULL;
  
      sd = cms_get0_signed(cms);
      if (sd == NULL)
          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 = ossl_cms_DigestAlgorithm_init_bio(digestAlgorithm,
                                                    ossl_cms_get0_cmsctx(cms));
          if (mdbio == NULL)
              goto err;
          if (chain != NULL)
              BIO_push(chain, mdbio);
          else
              chain = mdbio;
      }
      return chain;
   err:
      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 = EVP_MD_CTX_new();
      EVP_PKEY_CTX *pkctx = NULL;
      int r = -1;
      unsigned char mval[EVP_MAX_MD_SIZE];
      unsigned int mlen;
  
      if (mctx == NULL) {
          ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
          goto err;
      }
      /* 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 == NULL) {
              ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
              goto err;
          }
      }
  
      if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
          goto err;
  
      if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
          ERR_raise(ERR_LIB_CMS, CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
          goto err;
      }
  
      /* If messageDigest found compare it */
  
      if (os != NULL) {
          if (mlen != (unsigned int)os->length) {
              ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
              goto err;
          }
  
          if (memcmp(mval, os->data, mlen)) {
              ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
              r = 0;
          } else
              r = 1;
      } else {
          const EVP_MD *md = EVP_MD_CTX_get0_md(mctx);
          const CMS_CTX *ctx = si->cms_ctx;
  
          pkctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
                                             si->pkey,
                                             ossl_cms_ctx_get0_propq(ctx));
          if (pkctx == NULL)
              goto err;
          if (EVP_PKEY_verify_init(pkctx) <= 0)
              goto err;
          if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
              goto err;
          si->pctx = pkctx;
          if (!cms_sd_asn1_ctrl(si, 1))
              goto err;
          r = EVP_PKEY_verify(pkctx, si->signature->data,
                              si->signature->length, mval, mlen);
          if (r <= 0) {
              ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
              r = 0;
          }
      }
  
   err:
      EVP_PKEY_CTX_free(pkctx);
      EVP_MD_CTX_free(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 == NULL || !ASN1_INTEGER_set(key, keysize)) {
              ASN1_INTEGER_free(key);
              return 0;
          }
      }
      alg = ossl_X509_ALGOR_from_nid(algnid, key != NULL ? V_ASN1_INTEGER :
                                     V_ASN1_UNDEF, key);
      if (alg == NULL) {
          ASN1_INTEGER_free(key);
          return 0;
      }
  
      if (*algs == NULL)
          *algs = sk_X509_ALGOR_new_null();
      if (*algs == NULL || !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_2012_256, -1)
          || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -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;
  }
  