trusty (3) X509_verify_cert.3ssl.gz

Provided by: libssl-doc_1.0.1f-1ubuntu2.27_all bug

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.

       The negative return value from X509_verify_cert() can only occur if no certificate is set in ctx (due to
       a programming error); if X509_verify_cert() twice without reinitialising 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.


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.