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Clarify negative return from X509_verify_cert()

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Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Viktor Dukhovni 2016-05-16 21:38:03 -04:00
parent 051b9604f1
commit aed4d5b7cb
1 changed files with 7 additions and 6 deletions
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13
doc/crypto/X509_verify_cert.pod
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@ -31,12 +31,13 @@ Applications rarely call this function directly but it is used by
OpenSSL internally for certificate validation, in both the S/MIME and
SSL/TLS code.
The negative return value from X509_verify_cert() can only occur if no
certificate is set in B<ctx> (due to a programming error); if X509_verify_cert()
twice without reinitialising B<ctx> in between; or if a retry
operation is requested during internal lookups (which never happens with
standard lookup methods). It is however recommended that application check
for <= 0 return value on error.
A negative return value from X509_verify_cert() can occur if it is invoked
incorrectly, such as with no certificate set in B<ctx>, or when it is called
twice in succession without reinitialising B<ctx> for the second call.
A negative return value can also happen due to internal resource problems or if
a retry operation is requested during internal lookups (which never happens
with standard lookup methods).
Applications must check for <= 0 return value on error.
=head1 BUGS