// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <openssl/x509.h>

const char *X509_verify_cert_error_string(long err) {
  switch (err) {
    case X509_V_OK:
      return "ok";
    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_CRL_NOT_YET_VALID:
      return "CRL is not yet valid";
    case X509_V_ERR_CERT_HAS_EXPIRED:
      return "certificate has expired";
    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_INVALID_NON_CA:
      return "invalid non-CA certificate (has CA markings)";
    case X509_V_ERR_PATH_LENGTH_EXCEEDED:
      return "path length constraint exceeded";
    case X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED:
      return "proxy path length constraint exceeded";
    case X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED:
      return "proxy certificates not allowed, please set the appropriate flag";
    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_APPLICATION_VERIFICATION:
      return "application verification failure";
    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_KEYUSAGE_NO_DIGITAL_SIGNATURE:
      return "key usage does not include digital signature";
    case X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION:
      return "unhandled critical CRL extension";
    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_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_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_INVALID_CALL:
      return "Invalid certificate verification context";
    case X509_V_ERR_STORE_LOOKUP:
      return "Issuer certificate lookup error";

    case X509_V_ERR_NAME_CONSTRAINTS_WITHOUT_SANS:
      return "Issuer has name constraints but leaf has no SANs";

    default:
      return "unknown certificate verification error";
  }
}