Making X.509 errors usable.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=/endpoint.crt ca_file=/ca.crt

OpenSSL: X509_­V_­ERR_­CERT_­NOT_­YET_­VALID (source)

The certificate is not yet valid: the notBefore date is after the current time.

GnuTLS: GNUTLS_CERT_NOT_ACTIVATED (source)

The certificate is not yet activated.

Botan: CERT_NOT_YET_VALID (source)

Certificate is not yet valid

mbedTLS: MBEDTLS_X509_BADCERT_FUTURE (source)

The certificate validity starts in the future

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=/endpoint.crt ca_file=/ca.crt

OpenSSL: X509_­V_­ERR_­CERT_­HAS_­EXPIRED (source)

The certificate has expired: that is the notAfter date is before the current time.

GnuTLS: GNUTLS_CERT_EXPIRED (source)

The certificate has expired.

Botan: CERT_HAS_EXPIRED (source)

Certificate has expired

mbedTLS: MBEDTLS_X509_BADCERT_EXPIRED (source)

The certificate validity has expired

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -CRLfile ca.crl -crl_check endpoint.crt
• GnuTLS: certtool --load-ca-certificate ca.crt --infile ca.crl --verify-crl
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt crl_file=ca.crl

OpenSSL: X509_­V_­ERR_­CRL_­NOT_­YET_­VALID (source)

The CRL is not yet valid.

GnuTLS: GNUTLS_CERT_REVOCATION_DATA_ISSUED_IN_FUTURE (source)

The revocation data have a future issue date.

mbedTLS: MBEDTLS_X509_BADCRL_FUTURE (source)

The CRL is from the future

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -CRLfile ca.crl -crl_check endpoint.crt
• GnuTLS: certtool --load-ca-certificate ca.crt --infile ca.crl --verify-crl
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt crl_file=ca.crl

OpenSSL: X509_­V_­ERR_­CRL_­HAS_­EXPIRED (source)

The CRL has expired.

GnuTLS: GNUTLS_CERT_REVOCATION_DATA_SUPERSEDED (source)

The revocation data are old and have been superseded.

mbedTLS: MBEDTLS_X509_BADCRL_EXPIRED (source)

The CRL is expired

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -CRLfile ca.crl -crl_check endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=/endpoint.crt ca_file=/ca.crt crl_file=/ca.crl

OpenSSL: X509_­V_­ERR_­CERT_­REVOKED (source)

The certificate has been revoked.

GnuTLS: GNUTLS_CERT_REVOKED (source)

Certificate is revoked by its authority. In X.509 this will be set only if CRLs are checked.

Botan: CERT_IS_REVOKED (source)

Certificate is revoked

mbedTLS: MBEDTLS_X509_BADCERT_REVOKED (source)

The certificate has been revoked (is on a CRL)

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile subca.crt -untrusted subca.crt endpoint.crt

OpenSSL: X509_­V_­ERR_­UNABLE_­TO_­GET_­ISSUER_­CERT (source)

The issuer certificate of a looked up certificate could not be found. This normally means the list of trusted certificates is not complete.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify endpoint.crt
• GnuTLS: certtool --verify --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt

OpenSSL: X509_­V_­ERR_­UNABLE_­TO_­GET_­ISSUER_­CERT_­LOCALLY (source)

The issuer certificate could not be found: this occurs if the issuer certificate of an untrusted certificate cannot be found.

GnuTLS: GNUTLS_CERT_SIGNER_NOT_FOUND (source)

The certificate’s issuer is not known. This is the case if the issuer is not included in the trusted certificate list.

Botan: CERT_ISSUER_NOT_FOUND (source)

Certificate issuer not found

mbedTLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED (source)

The certificate is not correctly signed by the trusted CA

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify endpoint.crt
• GnuTLS: certtool --verify --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt

OpenSSL: X509_­V_­ERR_­DEPTH_­ZERO_­SELF_­SIGNED_­CERT (source)

The passed certificate is self-signed and the same certificate cannot be found in the list of trusted certificates.

GnuTLS: GNUTLS_CERT_SIGNER_NOT_FOUND (source)

The certificate’s issuer is not known. This is the case if the issuer is not included in the trusted certificate list.

Botan: CANNOT_ESTABLISH_TRUST (source)

Cannot establish trust

mbedTLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED (source)

The certificate is not correctly signed by the trusted CA

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -untrusted ca.crt endpoint.crt
• GnuTLS: certtool --verify --infile chain.crt
• Botan: botan cert_verify chain.crt

OpenSSL: X509_­V_­ERR_­SELF_­SIGNED_­CERT_­IN_­CHAIN (source)

The certificate chain could be built up using the untrusted certificates but the root could not be found locally.

GnuTLS: GNUTLS_CERT_SIGNER_NOT_FOUND (source)

The certificate’s issuer is not known. This is the case if the issuer is not included in the trusted certificate list.

Botan: CANNOT_ESTABLISH_TRUST (source)

Cannot establish trust

mbedTLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED (source)

The certificate is not correctly signed by the trusted CA

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile subca.crt -untrusted subca.crt -verify_depth 0 endpoint.crt

OpenSSL: X509_­V_­ERR_­CERT_­CHAIN_­TOO_­LONG (source)

The certificate chain length is greater than the supplied maximum depth. Unused.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -crl_check -CAfile ca.crt endpoint.crt

OpenSSL: X509_­V_­ERR_­UNABLE_­TO_­GET_­CRL (source)

The CRL of a certificate could not be found.

OpenSSL: X509_­V_­ERR_­UNABLE_­TO_­GET_­CRL_­ISSUER (source)

Unable to get CRL issuer certificate.

OpenSSL: X509_­V_­ERR_­CRL_­PATH_­VALIDATION_­ERROR (source)

CRL path validation error.

OpenSSL: X509_­V_­ERR_­DIFFERENT_­CRL_­SCOPE (source)

Different CRL scope.

OpenSSL: X509_­V_­ERR_­UNABLE_­TO_­VERIFY_­LEAF_­SIGNATURE (source)

No signatures could be verified because the chain contains only one certificate and it is not self signed.

OpenSSL: X509_­V_­ERR_­PATH_­LOOP (source)

Path loop.

OpenSSL: X509_­V_­ERR_­OCSP_­CERT_­UNKNOWN (source)

Returned by the verify callback to indicate that the certificate is not recognized by the OCSP responder.

OpenSSL: X509_­V_­ERR_­AKID_­SKID_­MISMATCH (source)

Not used as of OpenSSL 1.1.0 as a result of the deprecation of the -issuer_checks option.

OpenSSL: X509_­V_­ERR_­AKID_­ISSUER_­SERIAL_­MISMATCH (source)

Not used as of OpenSSL 1.1.0 as a result of the deprecation of the -issuer_checks option.

OpenSSL: X509_­V_­ERR_­SUBJECT_­ISSUER_­MISMATCH (source)

Not used as of OpenSSL 1.1.0 as a result of the deprecation of the -issuer_checks option.

OpenSSL: X509_­V_­ERR_­OCSP_­VERIFY_­FAILED (source)

Returned by the verify callback to indicate OCSP verification failed.

OpenSSL: X509_­V_­ERR_­UNSUPPORTED_­EXTENSION_­FEATURE (source)

Unsupported extension feature.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -untrusted subca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile chain.crt
• Botan: botan cert_verify endpoint.crt subca.crt ca.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt

OpenSSL: X509_­V_­ERR_­INVALID_­CA (source)

A CA certificate is invalid. Either it is not a CA or its extensions are not consistent with the supplied purpose.

GnuTLS: GNUTLS_CERT_SIGNER_NOT_CA (source)

The certificate’s signer was not a CA. This may happen if this was a version 1 certificate, which is common with some CAs, or a version 3 certificate without the basic constrains extension.

Botan: CA_CERT_NOT_FOR_CERT_ISSUER (source)

CA certificate not allowed to issue certs

mbedTLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED (source)

The certificate is not correctly signed by the trusted CA

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -untrusted subca1.crt -untrusted subca2.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile chain.crt
• Botan: botan cert_verify endpoint.crt subca1.crt subca2.crt ca.crt

OpenSSL: X509_­V_­ERR_­PATH_­LENGTH_­EXCEEDED (source)

The basicConstraints pathlength parameter has been exceeded.

GnuTLS: GNUTLS_CERT_SIGNER_CONSTRAINTS_FAILURE (source)

The certificate’s signer constraints were violated.

Botan: CERT_CHAIN_TOO_LONG (source)

Certificate chain too long

mbedTLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED (source)

The certificate is not correctly signed by the trusted CA

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt

OpenSSL: X509_­V_­ERR_­UNHANDLED_­CRITICAL_­EXTENSION (source)

Unhandled critical extension.

GnuTLS: GNUTLS_CERT_UNKNOWN_CRIT_EXTENSIONS (source)

The certificate has extensions marked as critical which are not supported.

Botan: UNKNOWN_CRITICAL_EXTENSION (source)

Unknown critical extension encountered

OpenSSL: X509_­V_­ERR_­UNHANDLED_­CRITICAL_­CRL_­EXTENSION (source)

Unhandled critical CRL extension.

OpenSSL: X509_­V_­ERR_­INVALID_­EXTENSION (source)

Invalid or inconsistent certificate extension.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -verify_hostname www.crocs.muni.cz endpoint.crt

OpenSSL: X509_­V_­ERR_­HOSTNAME_­MISMATCH (source)

Hostname mismatch.

Botan: CERT_NAME_NO_MATCH (source)

Certificate does not match provided name

mbedTLS: MBEDTLS_X509_BADCERT_CN_MISMATCH (source)

The certificate Common Name (CN) does not match with the expected CN

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -verify_email crocs@muni.cz endpoint.crt

OpenSSL: X509_­V_­ERR_­EMAIL_­MISMATCH (source)

Email address mismatch.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -verify_ip 192.168.0.0. endpoint.crt

OpenSSL: X509_­V_­ERR_­IP_­ADDRESS_­MISMATCH (source)

IP address mismatch.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt

OpenSSL: X509_­V_­ERR_­PERMITTED_­VIOLATION (source)

Permitted subtree violation.

GnuTLS: GNUTLS_CERT_SIGNER_CONSTRAINTS_FAILURE (source)

The certificate’s signer constraints were violated.

Botan: NAME_CONSTRAINT_ERROR (source)

Certificate does not pass name constraint

mbedTLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED (source)

The certificate is not correctly signed by the trusted CA

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt

OpenSSL: X509_­V_­ERR_­EXCLUDED_­VIOLATION (source)

Excluded subtree violation.

GnuTLS: GNUTLS_CERT_SIGNER_CONSTRAINTS_FAILURE (source)

The certificate’s signer constraints were violated.

mbedTLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED (source)

The certificate is not correctly signed by the trusted CA

OpenSSL: X509_­V_­ERR_­SUBTREE_­MINMAX (source)

Name constraints minimum and maximum not supported.

OpenSSL: X509_­V_­ERR_­UNSUPPORTED_­CONSTRAINT_­TYPE (source)

Unsupported name constraint type.

OpenSSL: X509_­V_­ERR_­UNSUPPORTED_­CONSTRAINT_­SYNTAX (source)

Unsupported or invalid name constraint syntax.

OpenSSL: X509_­V_­ERR_­UNSUPPORTED_­NAME_­SYNTAX (source)

Unsupported or invalid name syntax.

OpenSSL: X509_­V_­ERR_­UNNESTED_­RESOURCE (source)

RFC 3779 resource not subset of parent's resources.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -purpose sslserver endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt --verify-purpose 1.3.6.1.5.5.7.3.1

OpenSSL: X509_­V_­ERR_­INVALID_­PURPOSE (source)

The supplied certificate cannot be used for the specified purpose.

GnuTLS: GNUTLS_CERT_PURPOSE_MISMATCH (source)

The certificate or an intermediate does not match the intended purpose (extended key usage).

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -purpose sslserver -CAfile sca.crt endpoint.crt

OpenSSL: X509_­V_­ERR_­CERT_­REJECTED (source)

The root CA is marked to reject the specified purpose.

OpenSSL: X509_­V_­ERR_­INVALID_­POLICY_­EXTENSION (source)

Invalid or inconsistent certificate policy extension.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -policy_check -explicit_policy -policy 1.3.6.1.4.1.5484.1.10.99.1.0 endpoint.crt

OpenSSL: X509_­V_­ERR_­NO_­EXPLICIT_­POLICY (source)

No explicit policy.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -crl_check -CRLfile ca.crl endpoint.crt
• GnuTLS: certtool --verify-crl --load-ca-certificate ca.crt < ca.crl

OpenSSL: X509_­V_­ERR_­KEYUSAGE_­NO_­CRL_­SIGN (source)

Key usage does not include CRL signing.

OpenSSL: X509_­V_­ERR_­KEYUSAGE_­NO_­DIGITAL_­SIGNATURE (source)

Key usage does not include digital signature.

OpenSSL: X509_­V_­ERR_­KEYUSAGE_­NO_­CERTSIGN (source)

Not used as of OpenSSL 1.1.0 as a result of the deprecation of the -issuer_checks option.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -auth_level 1 endpoint.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt

OpenSSL: X509_­V_­ERR_­EE_­KEY_­TOO_­SMALL (source)

EE certificate key too weak.

mbedTLS: MBEDTLS_X509_BADCERT_BAD_KEY (source)

The certificate is signed with an unacceptable key (eg bad curve, RSA too short).

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -auth_level 1 endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt

OpenSSL: X509_­V_­ERR_­CA_­KEY_­TOO_­SMALL (source)

CA certificate key too weak.

Botan: SIGNATURE_METHOD_TOO_WEAK (source)

Signature method too weak

mbedTLS: MBEDTLS_X509_BADCERT_BAD_KEY (source)

The certificate is signed with an unacceptable key (eg bad curve, RSA too short).

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -auth_level 3 endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt

OpenSSL: X509_­V_­ERR_­CA_­MD_­TOO_­WEAK (source)

CA signature digest algorithm too weak.

Botan: UNTRUSTED_HASH (source)

Hash function used is considered too weak for security

mbedTLS: MBEDTLS_X509_BADCERT_BAD_MD (source)

The certificate is signed with an unacceptable hash.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -suiteB_128_only endpoint.crt

OpenSSL: X509_­V_­ERR_­SUITE_­B_­INVALID_­VERSION (source)

Suite B: certificate version invalid.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -suiteB_192 endpoint.crt

OpenSSL: X509_­V_­ERR_­SUITE_­B_­INVALID_­ALGORITHM (source)

Suite B: invalid public key algorithm.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -suiteB_128_only endpoint.crt

OpenSSL: X509_­V_­ERR_­SUITE_­B_­INVALID_­CURVE (source)

Suite B: invalid ECC curve.

OpenSSL: X509_­V_­ERR_­SUITE_­B_­INVALID_­SIGNATURE_­ALGORITHM (source)

Suite B: invalid signature algorithm.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -suiteB_192 endpoint.crt

OpenSSL: X509_­V_­ERR_­SUITE_­B_­LOS_­NOT_­ALLOWED (source)

Suite B: curve not allowed for this LOS.

OpenSSL: X509_­V_­ERR_­SUITE_­B_­CANNOT_­SIGN_­P_­384_­WITH_­P_­256 (source)

Suite B: cannot sign P-384 with P-256.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt

OpenSSL: X509_­V_­ERR_­CERT_­SIGNATURE_­FAILURE (source)

The signature of the certificate is invalid.

GnuTLS: GNUTLS_CERT_SIGNATURE_FAILURE (source)

The signature verification failed.

Botan: SIGNATURE_ERROR (source)

Signature error

mbedTLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED (source)

The certificate is not correctly signed by the trusted CA

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt -CRLfile ca.crl -crl_check endpoint.crt
• GnuTLS: certtool --load-ca-certificate ca.crt --verify-crl --infile ca.crl

OpenSSL: X509_­V_­ERR_­CRL_­SIGNATURE_­FAILURE (source)

The signature of the certificate is invalid.

GnuTLS: GNUTLS_CERT_SIGNATURE_FAILURE (source)

The signature verification failed.

OpenSSL: X509_­V_­ERR_­ERROR_­IN_­CERT_­NOT_­BEFORE_­FIELD (source)

The certificate notBefore field contains an invalid time.

OpenSSL: X509_­V_­ERR_­ERROR_­IN_­CERT_­NOT_­AFTER_­FIELD (source)

The certificate notAfter field contains an invalid time.

OpenSSL: X509_­V_­ERR_­ERROR_­IN_­CRL_­LAST_­UPDATE_­FIELD (source)

The CRL lastUpdate field contains an invalid time.

OpenSSL: X509_­V_­ERR_­ERROR_­IN_­CRL_­NEXT_­UPDATE_­FIELD (source)

The CRL nextUpdate field contains an invalid time.

OpenSSL: X509_­V_­ERR_­UNABLE_­TO_­DECRYPT_­CERT_­SIGNATURE (source)

The certificate signature could not be decrypted. This means that the actual signature value could not be determined rather than it not matching the expected value, this is only meaningful for RSA keys.

OpenSSL: X509_­V_­ERR_­UNABLE_­TO_­DECRYPT_­CRL_­SIGNATURE (source)

The CRL signature could not be decrypted: this means that the actual signature value could not be determined rather than it not matching the expected value. Unused.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt
• mbedTLS: mbedtls/programs/x509/cert_app mode=file filename=endpoint.crt ca_file=ca.crt

OpenSSL: X509_­V_­ERR_­UNABLE_­TO_­DECODE_­ISSUER_­PUBLIC_­KEY (source)

The public key in the certificate SubjectPublicKeyInfo could not be read.

OpenSSL: X509_­V_­ERR_­NO_­ISSUER_­PUBLIC_­KEY (source)

Issuer certificate doesn't have a public key.

OpenSSL: X509_­V_­ERR_­SIGNATURE_­ALGORITHM_­MISMATCH (source)

Subject signature algorithm and issuer public key algorithm mismatch

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt

OpenSSL: X509_­V_­ERR_­PROXY_­CERTIFICATES_­NOT_­ALLOWED (source)

Proxy certificates not allowed, please use -allow_proxy_certs.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -allow_proxy_certs -CAfile ca.crt endpoint.crt

OpenSSL: X509_­V_­ERR_­INVALID_­NON_­CA (source)

Invalid non-CA certificate has CA markings.

OpenSSL: X509_­V_­ERR_­PROXY_­PATH_­LENGTH_­EXCEEDED (source)

Proxy path length constraint exceeded.

OpenSSL: X509_­V_­ERR_­PROXY_­SUBJECT_­NAME_­VIOLATION (source)

Proxy certificate name violation.

OpenSSL: X509_­V_­ERR_­INVALID_­CALL (source)

Invalid certificate verification context.

OpenSSL: X509_­V_­ERR_­STORE_­LOOKUP (source)

Issuer certificate lookup error.

OpenSSL: X509_­V_­ERR_­OUT_­OF_­MEM (source)

An error occurred trying to allocate memory. This should never happen.

OpenSSL: X509_­V_­ERR_­APPLICATION_­VERIFICATION (source)

Application verification failure. Unused.

OpenSSL: X509_­V_­ERR_­DANE_­NO_­MATCH (source)

DANE TLSA authentication is enabled, but no TLSA records matched the certificate chain. This error is only possible in s_client(1).

OpenSSL: X509_­V_­ERR_­NO_­VALID_­SCTS (source)

Certificate Transparency required, but no valid SCTs found.

OpenSSL: X509_­V_­ERR_­OCSP_­VERIFY_­NEEDED (source)

Returned by the verify callback to indicate an OCSP verification is needed.

OpenSSL: X509_­V_­ERR_­UNSPECIFIED (source)

Unspecified error; should not happen.

OpenSSL: X509_­V_­ERR_­PROXY_­SUBJECT_­INVALID (source)

Proxy certificate subject is invalid. It MUST be the same as the issuer with a single CN component added.

Example certificate

Download the certificate archive. If you are interested in generating such certificate yourself, see the generating script for this case on the project GitHub. To get the validation error, run the command as indicated below.

• OpenSSL: openssl verify -CAfile ca.crt endpoint.crt
• GnuTLS: certtool --verify --load-ca-certificate ca.crt --infile endpoint.crt
• Botan: botan cert_verify endpoint.crt ca.crt

OpenSSL: X509_­V_­OK (source)

The operation was successful.

Botan: OK (source)

(No detailed documentation provided by the library.)