text: /*
   * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (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 <stdio.h>
  #include "internal/cryptlib.h"
  #include <openssl/asn1t.h>
  #include <openssl/pkcs7.h>
  #include <openssl/x509.h>
  
  /* PKCS#7 ASN1 module */
  
  /* This is the ANY DEFINED BY table for the top level PKCS#7 structure */
  
  ASN1_ADB_TEMPLATE(p7default) = ASN1_EXP_OPT(PKCS7, d.other, ASN1_ANY, 0);
  
  ASN1_ADB(PKCS7) = {
          ADB_ENTRY(NID_pkcs7_data, ASN1_NDEF_EXP_OPT(PKCS7, d.data, ASN1_OCTET_STRING_NDEF, 0)),
          ADB_ENTRY(NID_pkcs7_signed, ASN1_NDEF_EXP_OPT(PKCS7, d.sign, PKCS7_SIGNED, 0)),
          ADB_ENTRY(NID_pkcs7_enveloped, ASN1_NDEF_EXP_OPT(PKCS7, d.enveloped, PKCS7_ENVELOPE, 0)),
          ADB_ENTRY(NID_pkcs7_signedAndEnveloped, ASN1_NDEF_EXP_OPT(PKCS7, d.signed_and_enveloped, PKCS7_SIGN_ENVELOPE, 0)),
          ADB_ENTRY(NID_pkcs7_digest, ASN1_NDEF_EXP_OPT(PKCS7, d.digest, PKCS7_DIGEST, 0)),
          ADB_ENTRY(NID_pkcs7_encrypted, ASN1_NDEF_EXP_OPT(PKCS7, d.encrypted, PKCS7_ENCRYPT, 0))
  } ASN1_ADB_END(PKCS7, 0, type, 0, &p7default_tt, NULL);
  
  /* PKCS#7 streaming support */
  static int pk7_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                    void *exarg)
  {
      ASN1_STREAM_ARG *sarg = exarg;
      PKCS7 **pp7 = (PKCS7 **)pval;
  
      switch (operation) {
  
      case ASN1_OP_STREAM_PRE:
          if (PKCS7_stream(&sarg->boundary, *pp7) <= 0)
              return 0;
          /* fall thru */
      case ASN1_OP_DETACHED_PRE:
          sarg->ndef_bio = PKCS7_dataInit(*pp7, sarg->out);
          if (!sarg->ndef_bio)
              return 0;
          break;
  
      case ASN1_OP_STREAM_POST:
      case ASN1_OP_DETACHED_POST:
          if (PKCS7_dataFinal(*pp7, sarg->ndef_bio) <= 0)
              return 0;
          break;
  
      }
      return 1;
  }
  
  ASN1_NDEF_SEQUENCE_cb(PKCS7, pk7_cb) = {
          ASN1_SIMPLE(PKCS7, type, ASN1_OBJECT),
          ASN1_ADB_OBJECT(PKCS7)
  }ASN1_NDEF_SEQUENCE_END_cb(PKCS7, PKCS7)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7)
  
  IMPLEMENT_ASN1_NDEF_FUNCTION(PKCS7)
  
  IMPLEMENT_ASN1_DUP_FUNCTION(PKCS7)
  
  ASN1_NDEF_SEQUENCE(PKCS7_SIGNED) = {
          ASN1_SIMPLE(PKCS7_SIGNED, version, ASN1_INTEGER),
          ASN1_SET_OF(PKCS7_SIGNED, md_algs, X509_ALGOR),
          ASN1_SIMPLE(PKCS7_SIGNED, contents, PKCS7),
          ASN1_IMP_SEQUENCE_OF_OPT(PKCS7_SIGNED, cert, X509, 0),
          ASN1_IMP_SET_OF_OPT(PKCS7_SIGNED, crl, X509_CRL, 1),
          ASN1_SET_OF(PKCS7_SIGNED, signer_info, PKCS7_SIGNER_INFO)
  } ASN1_NDEF_SEQUENCE_END(PKCS7_SIGNED)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_SIGNED)
  
  /* Minor tweak to operation: free up EVP_PKEY */
  static int si_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                   void *exarg)
  {
      if (operation == ASN1_OP_FREE_POST) {
          PKCS7_SIGNER_INFO *si = (PKCS7_SIGNER_INFO *)*pval;
          EVP_PKEY_free(si->pkey);
      }
      return 1;
  }
  
  ASN1_SEQUENCE_cb(PKCS7_SIGNER_INFO, si_cb) = {
          ASN1_SIMPLE(PKCS7_SIGNER_INFO, version, ASN1_INTEGER),
          ASN1_SIMPLE(PKCS7_SIGNER_INFO, issuer_and_serial, PKCS7_ISSUER_AND_SERIAL),
          ASN1_SIMPLE(PKCS7_SIGNER_INFO, digest_alg, X509_ALGOR),
          /* NB this should be a SET OF but we use a SEQUENCE OF so the
           * original order * is retained when the structure is reencoded.
           * Since the attributes are implicitly tagged this will not affect
           * the encoding.
           */
          ASN1_IMP_SEQUENCE_OF_OPT(PKCS7_SIGNER_INFO, auth_attr, X509_ATTRIBUTE, 0),
          ASN1_SIMPLE(PKCS7_SIGNER_INFO, digest_enc_alg, X509_ALGOR),
          ASN1_SIMPLE(PKCS7_SIGNER_INFO, enc_digest, ASN1_OCTET_STRING),
          ASN1_IMP_SET_OF_OPT(PKCS7_SIGNER_INFO, unauth_attr, X509_ATTRIBUTE, 1)
  } ASN1_SEQUENCE_END_cb(PKCS7_SIGNER_INFO, PKCS7_SIGNER_INFO)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_SIGNER_INFO)
  
  ASN1_SEQUENCE(PKCS7_ISSUER_AND_SERIAL) = {
          ASN1_SIMPLE(PKCS7_ISSUER_AND_SERIAL, issuer, X509_NAME),
          ASN1_SIMPLE(PKCS7_ISSUER_AND_SERIAL, serial, ASN1_INTEGER)
  } ASN1_SEQUENCE_END(PKCS7_ISSUER_AND_SERIAL)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_ISSUER_AND_SERIAL)
  
  ASN1_NDEF_SEQUENCE(PKCS7_ENVELOPE) = {
          ASN1_SIMPLE(PKCS7_ENVELOPE, version, ASN1_INTEGER),
          ASN1_SET_OF(PKCS7_ENVELOPE, recipientinfo, PKCS7_RECIP_INFO),
          ASN1_SIMPLE(PKCS7_ENVELOPE, enc_data, PKCS7_ENC_CONTENT)
  } ASN1_NDEF_SEQUENCE_END(PKCS7_ENVELOPE)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_ENVELOPE)
  
  /* Minor tweak to operation: free up X509 */
  static int ri_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                   void *exarg)
  {
      if (operation == ASN1_OP_FREE_POST) {
          PKCS7_RECIP_INFO *ri = (PKCS7_RECIP_INFO *)*pval;
          X509_free(ri->cert);
      }
      return 1;
  }
  
  ASN1_SEQUENCE_cb(PKCS7_RECIP_INFO, ri_cb) = {
          ASN1_SIMPLE(PKCS7_RECIP_INFO, version, ASN1_INTEGER),
          ASN1_SIMPLE(PKCS7_RECIP_INFO, issuer_and_serial, PKCS7_ISSUER_AND_SERIAL),
          ASN1_SIMPLE(PKCS7_RECIP_INFO, key_enc_algor, X509_ALGOR),
          ASN1_SIMPLE(PKCS7_RECIP_INFO, enc_key, ASN1_OCTET_STRING)
  } ASN1_SEQUENCE_END_cb(PKCS7_RECIP_INFO, PKCS7_RECIP_INFO)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_RECIP_INFO)
  
  ASN1_NDEF_SEQUENCE(PKCS7_ENC_CONTENT) = {
          ASN1_SIMPLE(PKCS7_ENC_CONTENT, content_type, ASN1_OBJECT),
          ASN1_SIMPLE(PKCS7_ENC_CONTENT, algorithm, X509_ALGOR),
          ASN1_IMP_OPT(PKCS7_ENC_CONTENT, enc_data, ASN1_OCTET_STRING_NDEF, 0)
  } ASN1_NDEF_SEQUENCE_END(PKCS7_ENC_CONTENT)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_ENC_CONTENT)
  
  ASN1_NDEF_SEQUENCE(PKCS7_SIGN_ENVELOPE) = {
          ASN1_SIMPLE(PKCS7_SIGN_ENVELOPE, version, ASN1_INTEGER),
          ASN1_SET_OF(PKCS7_SIGN_ENVELOPE, recipientinfo, PKCS7_RECIP_INFO),
          ASN1_SET_OF(PKCS7_SIGN_ENVELOPE, md_algs, X509_ALGOR),
          ASN1_SIMPLE(PKCS7_SIGN_ENVELOPE, enc_data, PKCS7_ENC_CONTENT),
          ASN1_IMP_SET_OF_OPT(PKCS7_SIGN_ENVELOPE, cert, X509, 0),
          ASN1_IMP_SET_OF_OPT(PKCS7_SIGN_ENVELOPE, crl, X509_CRL, 1),
          ASN1_SET_OF(PKCS7_SIGN_ENVELOPE, signer_info, PKCS7_SIGNER_INFO)
  } ASN1_NDEF_SEQUENCE_END(PKCS7_SIGN_ENVELOPE)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_SIGN_ENVELOPE)
  
  ASN1_NDEF_SEQUENCE(PKCS7_ENCRYPT) = {
          ASN1_SIMPLE(PKCS7_ENCRYPT, version, ASN1_INTEGER),
          ASN1_SIMPLE(PKCS7_ENCRYPT, enc_data, PKCS7_ENC_CONTENT)
  } ASN1_NDEF_SEQUENCE_END(PKCS7_ENCRYPT)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_ENCRYPT)
  
  ASN1_NDEF_SEQUENCE(PKCS7_DIGEST) = {
          ASN1_SIMPLE(PKCS7_DIGEST, version, ASN1_INTEGER),
          ASN1_SIMPLE(PKCS7_DIGEST, md, X509_ALGOR),
          ASN1_SIMPLE(PKCS7_DIGEST, contents, PKCS7),
          ASN1_SIMPLE(PKCS7_DIGEST, digest, ASN1_OCTET_STRING)
  } ASN1_NDEF_SEQUENCE_END(PKCS7_DIGEST)
  
  IMPLEMENT_ASN1_FUNCTIONS(PKCS7_DIGEST)
  
  /* Specials for authenticated attributes */
  
  /*
   * When signing attributes we want to reorder them to match the sorted
   * encoding.
   */
  
  ASN1_ITEM_TEMPLATE(PKCS7_ATTR_SIGN) =
          ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_ORDER, 0, PKCS7_ATTRIBUTES, X509_ATTRIBUTE)
  ASN1_ITEM_TEMPLATE_END(PKCS7_ATTR_SIGN)
  
  /*
   * When verifying attributes we need to use the received order. So we use
   * SEQUENCE OF and tag it to SET OF
   */
  
  ASN1_ITEM_TEMPLATE(PKCS7_ATTR_VERIFY) =
          ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_IMPTAG | ASN1_TFLG_UNIVERSAL,
                                  V_ASN1_SET, PKCS7_ATTRIBUTES, X509_ATTRIBUTE)
  ASN1_ITEM_TEMPLATE_END(PKCS7_ATTR_VERIFY)
  
  IMPLEMENT_ASN1_PRINT_FUNCTION(PKCS7)
  