the explanation of the openssl returned error number

DIAGNOSTICS
When a verify operation fails the output messages can be somewhat cryptic. The general form of the error message is: 

 server.pem: /C=AU/ST=Queensland/O=CryptSoft Pty Ltd/CN=Test CA (1024 bit)
 error 24 at 1 depth lookup:invalid CA certificate

The first line contains the name of the certificate being verified followed by the subject name of the certificate. The second line contains the error number and the depth. The depth is number of the certificate being verified when a problem was detected starting with zero for the certificate being verified itself then 1 for the CA that signed the certificate and so on. Finally a text version of the error number is presented. 

An exhaustive list of the error codes and messages is shown below, this also includes the name of the error code as defined in the header file x509_vfy.h Some of the error codes are defined but never returned: these are described as ``unused''. 

0 X509_V_OK: ok
the operation was successful. 

2 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate
the issuer certificate could not be found: this occurs if the issuer certificate of an untrusted certificate cannot be found. 

3 X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL
the CRL of a certificate could not be found. 

4 X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: unable to decrypt certificate's signature
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. 

5 X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt CRL's signature
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. 

6 X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key
the public key in the certificate SubjectPublicKeyInfo could not be read. 

7 X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure
the signature of the certificate is invalid. 

8 X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure
the signature of the certificate is invalid. 

9 X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid
the certificate is not yet valid: the notBefore date is after the current time. 

10 X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired
the certificate has expired: that is the notAfter date is before the current time. 

11 X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid
the CRL is not yet valid. 

12 X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired
the CRL has expired. 

13 X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field
the certificate notBefore field contains an invalid time. 

14 X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field
the certificate notAfter field contains an invalid time. 

15 X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in CRL's lastUpdate field
the CRL lastUpdate field contains an invalid time. 

16 X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in CRL's nextUpdate field
the CRL nextUpdate field contains an invalid time. 

17 X509_V_ERR_OUT_OF_MEM: out of memory
an error occurred trying to allocate memory. This should never happen. 

18 X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self signed certificate
the passed certificate is self signed and the same certificate cannot be found in the list of trusted certificates. 

19 X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: self signed certificate in certificate chain
the certificate chain could be built up using the untrusted certificates but the root could not be found locally. 

20 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate
the issuer certificate of a locally looked up certificate could not be found. This normally means the list of trusted certificates is not complete. 

21 X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: unable to verify the first certificate
no signatures could be verified because the chain contains only one certificate and it is not self signed. 

22 X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long
the certificate chain length is greater than the supplied maximum depth. Unused. 

23 X509_V_ERR_CERT_REVOKED: certificate revoked
the certificate has been revoked. 

24 X509_V_ERR_INVALID_CA: invalid CA certificate
a CA certificate is invalid. Either it is not a CA or its extensions are not consistent with the supplied purpose. 

25 X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded
the basicConstraints pathlength parameter has been exceeded. 

26 X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose
the supplied certificate cannot be used for the specified purpose. 

27 X509_V_ERR_CERT_UNTRUSTED: certificate not trusted
the root CA is not marked as trusted for the specified purpose. 

28 X509_V_ERR_CERT_REJECTED: certificate rejected
the root CA is marked to reject the specified purpose. 

29 X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch
the current candidate issuer certificate was rejected because its subject name did not match the issuer name of the current certificate. Only displayed when the -issuer_checks option is set. 

30 X509_V_ERR_AKID_SKID_MISMATCH: authority and subject key identifier mismatch
the current candidate issuer certificate was rejected because its subject key identifier was present and did not match the authority key identifier current certificate. Only displayed when the -issuer_checks option is set. 

31 X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: authority and issuer serial number mismatch
the current candidate issuer certificate was rejected because its issuer name and serial number was present and did not match the authority key identifier of the current certificate. Only displayed when the -issuer_checks option is set. 

32 X509_V_ERR_KEYUSAGE_NO_CERTSIGN:key usage does not include certificate signing
the current candidate issuer certificate was rejected because its keyUsage extension does not permit certificate signing. 

50 X509_V_ERR_APPLICATION_VERIFICATION: application verification failure
an application specific error. Unused.

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DIAGNOSTICS

When a verify operation fails the output messages can be somewhat cryptic. The general form of the error message is:

server.pem: /C=AU/ST=Queensland/O=CryptSoft Pty Ltd/CN=Test CA (1024 bit)

error 24 at 1 depth lookup:invalid CA certificate

The first line contains the name of the certificate being verified followed by the subject name of the certificate. The second line contains the error number and the depth. The depth is number of the certificate being verified when a problem was detected starting with zero for the certificate being verified itself then 1 for the CA that signed the certificate and so on. Finally a text version of the error number is presented.

An exhaustive list of the error codes and messages is shown below, this also includes the name of the error code as defined in the header file x509_vfy.h Some of the error codes are defined but never returned: these are described as ``unused''.

0 X509_V_OK: ok

the operation was successful.

2 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate

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

3 X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL

the CRL of a certificate could not be found.

4 X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: unable to decrypt certificate's signature

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.

5 X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt CRL's signature

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.

6 X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key

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

7 X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure

the signature of the certificate is invalid.

8 X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure

the signature of the certificate is invalid.

9 X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid

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

10 X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired

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

11 X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid

the CRL is not yet valid.

12 X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired

the CRL has expired.

13 X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field

the certificate notBefore field contains an invalid time.

14 X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field

the certificate notAfter field contains an invalid time.

15 X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in CRL's lastUpdate field

the CRL lastUpdate field contains an invalid time.

16 X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in CRL's nextUpdate field

the CRL nextUpdate field contains an invalid time.

17 X509_V_ERR_OUT_OF_MEM: out of memory

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

18 X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self signed certificate

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

19 X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: self signed certificate in certificate chain

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

20 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate

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

21 X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: unable to verify the first certificate

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

22 X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long

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

23 X509_V_ERR_CERT_REVOKED: certificate revoked

the certificate has been revoked.

24 X509_V_ERR_INVALID_CA: invalid CA certificate

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

25 X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded

the basicConstraints pathlength parameter has been exceeded.

26 X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose

the supplied certificate cannot be used for the specified purpose.

27 X509_V_ERR_CERT_UNTRUSTED: certificate not trusted

the root CA is not marked as trusted for the specified purpose.

28 X509_V_ERR_CERT_REJECTED: certificate rejected

the root CA is marked to reject the specified purpose.

29 X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch

the current candidate issuer certificate was rejected because its subject name did not match the issuer name of the current certificate. Only displayed when the -issuer_checks option is set.

30 X509_V_ERR_AKID_SKID_MISMATCH: authority and subject key identifier mismatch

the current candidate issuer certificate was rejected because its subject key identifier was present and did not match the authority key identifier current certificate. Only displayed when the -issuer_checks option is set.

31 X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: authority and issuer serial number mismatch

the current candidate issuer certificate was rejected because its issuer name and serial number was present and did not match the authority key identifier of the current certificate. Only displayed when the -issuer_checks option is set.

32 X509_V_ERR_KEYUSAGE_NO_CERTSIGN:key usage does not include certificate signing

the current candidate issuer certificate was rejected because its keyUsage extension does not permit certificate signing.

50 X509_V_ERR_APPLICATION_VERIFICATION: application verification failure

an application specific error. Unused.

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the explanation of the openssl returned error number

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