NAME¶
X509_verify_cert - discover and verify X509 certificte chain
SYNOPSIS¶
#include <openssl/x509.h>
int X509_verify_cert(X509_STORE_CTX *ctx);
DESCRIPTION¶
The
X509_verify_cert() function attempts to discover and validate a
certificate chain based on parameters in
ctx. A complete description of
the process is contained in the
verify(1) manual page.
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
ctx using, for example
X509_STORE_CTX_get_error().
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.
A negative return value from
X509_verify_cert() can occur if it is
invoked incorrectly, such as with no certificate set in
ctx, or when it
is called twice in succession without reinitialising
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.
BUGS¶
This function uses the header
x509.h as opposed to most chain
verification functiosn which use
x509_vfy.h.
SEE ALSO¶
X509_STORE_CTX_get_error(3)
HISTORY¶
X509_verify_cert() is available in all versions of SSLeay and
OpenSSL.