text: /*
   * Copyright 1995-2018 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/evp.h>
  #include <openssl/objects.h>
  #include <openssl/x509.h>
  
  int X509_certificate_type(const X509 *x, const EVP_PKEY *pkey)
  {
      const EVP_PKEY *pk;
      int ret = 0, i;
  
      if (x == NULL)
          return 0;
  
      if (pkey == NULL)
          pk = X509_get0_pubkey(x);
      else
          pk = pkey;
  
      if (pk == NULL)
          return 0;
  
      switch (EVP_PKEY_id(pk)) {
      case EVP_PKEY_RSA:
          ret = EVP_PK_RSA | EVP_PKT_SIGN;
  /*              if (!sign only extension) */
          ret |= EVP_PKT_ENC;
          break;
      case EVP_PKEY_RSA_PSS:
          ret = EVP_PK_RSA | EVP_PKT_SIGN;
          break;
      case EVP_PKEY_DSA:
          ret = EVP_PK_DSA | EVP_PKT_SIGN;
          break;
      case EVP_PKEY_EC:
          ret = EVP_PK_EC | EVP_PKT_SIGN | EVP_PKT_EXCH;
          break;
      case EVP_PKEY_ED448:
      case EVP_PKEY_ED25519:
          ret = EVP_PKT_SIGN;
          break;
      case EVP_PKEY_DH:
          ret = EVP_PK_DH | EVP_PKT_EXCH;
          break;
      case EVP_PKEY_KYBER:
          ret = EVP_PK_KYBER | EVP_PKT_EXCH | EVP_PKT_ENC;
          break;
      case EVP_PKEY_NTTRU:
        ret = EVP_PK_NTTRU | EVP_PKT_EXCH | EVP_PKT_ENC;
        break;
      case EVP_PKEY_DILITHIUM:
          ret = EVP_PK_DILITHIUM | EVP_PKT_SIGN;
          break;
      case NID_id_GostR3410_2001:
      case NID_id_GostR3410_2012_256:
      case NID_id_GostR3410_2012_512:
          ret = EVP_PKT_EXCH | EVP_PKT_SIGN;
          break;
      default:
          break;
      }
  
      i = X509_get_signature_nid(x);
      if (i && OBJ_find_sigid_algs(i, NULL, &i)) {
  
          switch (i) {
          case NID_rsaEncryption:
          case NID_rsa:
              ret |= EVP_PKS_RSA;
              break;
          case NID_dilithium:
              ret |= EVP_PKS_DILITHIUM;
              break;
          case NID_dsa:
          case NID_dsa_2:
              ret |= EVP_PKS_DSA;
              break;
          case NID_X9_62_id_ecPublicKey:
              ret |= EVP_PKS_EC;
              break;
          default:
              break;
          }
      }
  
      return ret;
  }
  