Updated: 2021/Apr/14


X509_verify_cert(3)                 OpenSSL                X509_verify_cert(3)



NAME
       X509_verify_cert - discover and verify X509 certificate chain

LIBRARY
       libcrypto, -lcrypto

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
       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>.



1.1.1i                            2018-09-23               X509_verify_cert(3)