X509_verify_cert(3) - phpMan

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.

1.0.2k                            2017-01-26               X509_verify_cert(3)