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- =pod
- =head1 NAME
- X509_verify_cert - discover and verify X509 certificte chain
- =head1 SYNOPSIS
- #include <openssl/x509.h>
- int X509_verify_cert(X509_STORE_CTX *ctx);
- =head1 DESCRIPTION
- The X509_verify_cert() function attempts to discover and validate a
- certificate chain based on parameters in B<ctx>. A complete description of
- the process is contained in the L<verify(1)|verify(1)> manual page.
- =head1 RETURN VALUES
- If a complete chain can be built and validated this function returns 1,
- otherwise it return zero, in exceptional circumstances it can also
- return a negative code.
- If the function fails additional error information can be obtained by
- examining B<ctx> using, for example X509_STORE_CTX_get_error().
- =head1 NOTES
- 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.
- =head1 BUGS
- This function uses the header B<x509.h> as opposed to most chain verification
- functiosn which use B<x509_vfy.h>.
- =head1 SEE ALSO
- L<X509_STORE_CTX_get_error(3)|X509_STORE_CTX_get_error(3)>
- =head1 HISTORY
- X509_verify_cert() is available in all versions of SSLeay and OpenSSL.
- =cut
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