X509_verify_cert(3)

X509_verify_cert(3)          OpenSSL          X509_verify_cert(3)

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.

1.0.2t               Last change: 2019-09-10                    1