| =pod |
| |
| =head1 NAME |
| |
| X509_verify_cert - discover and verify X509 certificate 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)> 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)> |
| |
| =cut |
