bionic (3) X509_verify_cert.3ssl.gz

Provided by: libssl-doc_1.1.1-1ubuntu2.1~18.04.23_all bug

NAME
       X509_verify_cert - discover and verify X509 certificate 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 functions which use
       x509_vfy.h.


SEE ALSO
       X509_STORE_CTX_get_error(3)


       Copyright 2009-2016 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use this file except in compliance with
       the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.