text: /*
   * Copyright 1995-2016 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 <time.h>
  #include <errno.h>
  
  #include "internal/cryptlib.h"
  #include <openssl/lhash.h>
  #include <openssl/buffer.h>
  #include <openssl/evp.h>
  #include <openssl/asn1.h>
  #include <openssl/x509.h>
  #include <openssl/objects.h>
  
  const char *X509_verify_cert_error_string(long n)
  {
      switch ((int)n) {
      case X509_V_OK:
          return ("ok");
      case X509_V_ERR_UNSPECIFIED:
          return ("unspecified certificate verification error");
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
          return ("unable to get issuer certificate");
      case X509_V_ERR_UNABLE_TO_GET_CRL:
          return ("unable to get certificate CRL");
      case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
          return ("unable to decrypt certificate's signature");
      case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
          return ("unable to decrypt CRL's signature");
      case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
          return ("unable to decode issuer public key");
      case X509_V_ERR_CERT_SIGNATURE_FAILURE:
          return ("certificate signature failure");
      case X509_V_ERR_CRL_SIGNATURE_FAILURE:
          return ("CRL signature failure");
      case X509_V_ERR_CERT_NOT_YET_VALID:
          return ("certificate is not yet valid");
      case X509_V_ERR_CERT_HAS_EXPIRED:
          return ("certificate has expired");
      case X509_V_ERR_CRL_NOT_YET_VALID:
          return ("CRL is not yet valid");
      case X509_V_ERR_CRL_HAS_EXPIRED:
          return ("CRL has expired");
      case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
          return ("format error in certificate's notBefore field");
      case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
          return ("format error in certificate's notAfter field");
      case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
          return ("format error in CRL's lastUpdate field");
      case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
          return ("format error in CRL's nextUpdate field");
      case X509_V_ERR_OUT_OF_MEM:
          return ("out of memory");
      case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
          return ("self signed certificate");
      case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
          return ("self signed certificate in certificate chain");
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
          return ("unable to get local issuer certificate");
      case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
          return ("unable to verify the first certificate");
      case X509_V_ERR_CERT_CHAIN_TOO_LONG:
          return ("certificate chain too long");
      case X509_V_ERR_CERT_REVOKED:
          return ("certificate revoked");
      case X509_V_ERR_INVALID_CA:
          return ("invalid CA certificate");
      case X509_V_ERR_PATH_LENGTH_EXCEEDED:
          return ("path length constraint exceeded");
      case X509_V_ERR_INVALID_PURPOSE:
          return ("unsupported certificate purpose");
      case X509_V_ERR_CERT_UNTRUSTED:
          return ("certificate not trusted");
      case X509_V_ERR_CERT_REJECTED:
          return ("certificate rejected");
      case X509_V_ERR_SUBJECT_ISSUER_MISMATCH:
          return ("subject issuer mismatch");
      case X509_V_ERR_AKID_SKID_MISMATCH:
          return ("authority and subject key identifier mismatch");
      case X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH:
          return ("authority and issuer serial number mismatch");
      case X509_V_ERR_KEYUSAGE_NO_CERTSIGN:
          return ("key usage does not include certificate signing");
      case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
          return ("unable to get CRL issuer certificate");
      case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
          return ("unhandled critical extension");
      case X509_V_ERR_KEYUSAGE_NO_CRL_SIGN:
          return ("key usage does not include CRL signing");
      case X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION:
          return ("unhandled critical CRL extension");
      case X509_V_ERR_INVALID_NON_CA:
          return ("invalid non-CA certificate (has CA markings)");
      case X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED:
          return ("proxy path length constraint exceeded");
      case X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE:
          return ("key usage does not include digital signature");
      case X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED:
          return
              ("proxy certificates not allowed, please set the appropriate flag");
      case X509_V_ERR_INVALID_EXTENSION:
          return ("invalid or inconsistent certificate extension");
      case X509_V_ERR_INVALID_POLICY_EXTENSION:
          return ("invalid or inconsistent certificate policy extension");
      case X509_V_ERR_NO_EXPLICIT_POLICY:
          return ("no explicit policy");
      case X509_V_ERR_DIFFERENT_CRL_SCOPE:
          return ("Different CRL scope");
      case X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE:
          return ("Unsupported extension feature");
      case X509_V_ERR_UNNESTED_RESOURCE:
          return ("RFC 3779 resource not subset of parent's resources");
      case X509_V_ERR_PERMITTED_VIOLATION:
          return ("permitted subtree violation");
      case X509_V_ERR_EXCLUDED_VIOLATION:
          return ("excluded subtree violation");
      case X509_V_ERR_SUBTREE_MINMAX:
          return ("name constraints minimum and maximum not supported");
      case X509_V_ERR_APPLICATION_VERIFICATION:
          return ("application verification failure");
      case X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:
          return ("unsupported name constraint type");
      case X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX:
          return ("unsupported or invalid name constraint syntax");
      case X509_V_ERR_UNSUPPORTED_NAME_SYNTAX:
          return ("unsupported or invalid name syntax");
      case X509_V_ERR_CRL_PATH_VALIDATION_ERROR:
          return ("CRL path validation error");
      case X509_V_ERR_PATH_LOOP:
          return ("Path Loop");
      case X509_V_ERR_SUITE_B_INVALID_VERSION:
          return ("Suite B: certificate version invalid");
      case X509_V_ERR_SUITE_B_INVALID_ALGORITHM:
          return ("Suite B: invalid public key algorithm");
      case X509_V_ERR_SUITE_B_INVALID_CURVE:
          return ("Suite B: invalid ECC curve");
      case X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM:
          return ("Suite B: invalid signature algorithm");
      case X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED:
          return ("Suite B: curve not allowed for this LOS");
      case X509_V_ERR_SUITE_B_CANNOT_SIGN_P_384_WITH_P_256:
          return ("Suite B: cannot sign P-384 with P-256");
      case X509_V_ERR_HOSTNAME_MISMATCH:
          return ("Hostname mismatch");
      case X509_V_ERR_EMAIL_MISMATCH:
          return ("Email address mismatch");
      case X509_V_ERR_IP_ADDRESS_MISMATCH:
          return ("IP address mismatch");
      case X509_V_ERR_DANE_NO_MATCH:
          return ("No matching DANE TLSA records");
      case X509_V_ERR_EE_KEY_TOO_SMALL:
          return ("EE certificate key too weak");
      case X509_V_ERR_CA_KEY_TOO_SMALL:
          return ("CA certificate key too weak");
      case X509_V_ERR_CA_MD_TOO_WEAK:
          return ("CA signature digest algorithm too weak");
      case X509_V_ERR_INVALID_CALL:
          return ("Invalid certificate verification context");
      case X509_V_ERR_STORE_LOOKUP:
          return ("Issuer certificate lookup error");
      case X509_V_ERR_NO_VALID_SCTS:
          return ("Certificate Transparency required, but no valid SCTs found");
      case X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION:
          return ("proxy subject name violation");
  
      default:
          /* Printing an error number into a static buffer is not thread-safe */
          return ("unknown certificate verification error");
      }
  }
  