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X509_verify_cert(3)			     OpenSSL			      X509_verify_cert(3)

       X509_verify_cert - discover and verify X509 certificte chain

	#include <openssl/x509.h>

	int X509_verify_cert(X509_STORE_CTX *ctx);

       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.

       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().

       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) 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.

       This function uses the header x509.h as opposed to most chain verification functiosn which
       use x509_vfy.h.


       X509_verify_cert() is available in all versions of SSLeay and OpenSSL.

1.0.1e					    2013-02-11			      X509_verify_cert(3)
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