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X509_STORE_CTX_NEW(3)		    OpenSSL		 X509_STORE_CTX_NEW(3)

NAME
       X509_STORE_CTX_new, X509_STORE_CTX_cleanup, X509_STORE_CTX_free,
       X509_STORE_CTX_init, X509_STORE_CTX_set0_trusted_stack,
       X509_STORE_CTX_set_cert,	X509_STORE_CTX_set0_crls,
       X509_STORE_CTX_get0_chain, X509_STORE_CTX_set0_verified_chain,
       X509_STORE_CTX_get0_param, X509_STORE_CTX_set0_param,
       X509_STORE_CTX_get0_untrusted, X509_STORE_CTX_set0_untrusted,
       X509_STORE_CTX_get_num_untrusted, X509_STORE_CTX_set_default,
       X509_STORE_CTX_set_verify, X509_STORE_CTX_verify_fn - X509_STORE_CTX
       initialisation

SYNOPSIS
	#include <openssl/x509_vfy.h>

	X509_STORE_CTX *X509_STORE_CTX_new(void);
	void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx);
	void X509_STORE_CTX_free(X509_STORE_CTX	*ctx);

	int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE	*store,
				X509 *x509, STACK_OF(X509) *chain);

	void X509_STORE_CTX_set0_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);

	void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x);
	STACK_OF(X509) *X509_STORE_CTX_get0_chain(X609_STORE_CTX *ctx);
	void X509_STORE_CTX_set0_verified_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *chain);
	void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk);

	X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx);
	void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
	int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name);

	STACK_OF(X509)*	X509_STORE_CTX_get0_untrusted(X509_STORE_CTX *ctx);
	void X509_STORE_CTX_set0_untrusted(X509_STORE_CTX *ctx,	STACK_OF(X509) *sk);

	int X509_STORE_CTX_get_num_untrusted(X509_STORE_CTX *ctx);

	typedef	int (*X509_STORE_CTX_verify_fn)(X509_STORE_CTX *);
	void X509_STORE_CTX_set_verify(X509_STORE_CTX *ctx, X509_STORE_CTX_verify_fn verify);

DESCRIPTION
       These functions initialise an X509_STORE_CTX structure for subsequent
       use by X509_verify_cert().

       X509_STORE_CTX_new() returns a newly initialised	X509_STORE_CTX
       structure.

       X509_STORE_CTX_cleanup()	internally cleans up an	X509_STORE_CTX
       structure.  The context can then	be reused with an new call to
       X509_STORE_CTX_init().

       X509_STORE_CTX_free() completely	frees up ctx. After this call ctx is
       no longer valid.	 If ctx	is NULL	nothing	is done.

       X509_STORE_CTX_init() sets up ctx for a subsequent verification
       operation.  It must be called before each call to X509_verify_cert(),
       i.e. a ctx is only good for one call to X509_verify_cert(); if you want
       to verify a second certificate with the same ctx	then you must call
       X509_STORE_CTX_cleanup()	and then X509_STORE_CTX_init() again before
       the second call to X509_verify_cert(). The trusted certificate store is
       set to store, the end entity certificate	to be verified is set to x509
       and a set of additional certificates (which will	be untrusted but may
       be used to build	the chain) in chain. Any or all	of the store, x509 and
       chain parameters	can be NULL.

       X509_STORE_CTX_set0_trusted_stack() sets	the set	of trusted
       certificates of ctx to sk. This is an alternative way of	specifying
       trusted certificates instead of using an	X509_STORE.

       X509_STORE_CTX_set_cert() sets the certificate to be verified in	ctx to
       x.

       X509_STORE_CTX_set0_verified_chain() sets the validated chain used by
       ctx to be chain.	 Ownership of the chain	is transferred to ctx and
       should not be free'd by the caller.  X509_STORE_CTX_get0_chain()
       returns a the internal pointer used by the ctx that contains the
       validated chain.

       X509_STORE_CTX_set0_crls() sets a set of	CRLs to	use to aid certificate
       verification to sk. These CRLs will only	be used	if CRL verification is
       enabled in the associated X509_VERIFY_PARAM structure. This might be
       used where additional "useful" CRLs are supplied	as part	of a protocol,
       for example in a	PKCS#7 structure.

       X509_STORE_CTX_get0_param() retrieves an	internal pointer to the
       verification parameters associated with ctx.

       X509_STORE_CTX_get0_untrusted() retrieves an internal pointer to	the
       stack of	untrusted certificates associated with ctx.

       X509_STORE_CTX_set0_untrusted() sets the	internal point to the stack of
       untrusted certificates associated with ctx to sk.

       X509_STORE_CTX_set0_param() sets	the internal verification parameter
       pointer to param. After this call param should not be used.

       X509_STORE_CTX_set_default() looks up and sets the default verification
       method to name. This uses the function X509_VERIFY_PARAM_lookup() to
       find an appropriate set of parameters from name.

       X509_STORE_CTX_get_num_untrusted() returns the number of	untrusted
       certificates that were used in building the chain following a call to
       X509_verify_cert().

       X509_STORE_CTX_set_verify() provides the	capability for overriding the
       default verify function.	This function is responsible for verifying
       chain signatures	and expiration times.

       A verify	function is defined as an X509_STORE_CTX_verify	type which has
       the following signature:

	int (*verify)(X509_STORE_CTX *);

       This function should receive the	current	X509_STORE_CTX as a parameter
       and return 1 on success or 0 on failure.

NOTES
       The certificates	and CRLs in a store are	used internally	and should not
       be freed	up until after the associated X509_STORE_CTX is	freed.

BUGS
       The certificates	and CRLs in a context are used internally and should
       not be freed up until after the associated X509_STORE_CTX is freed.
       Copies should be	made or	reference counts increased instead.

RETURN VALUES
       X509_STORE_CTX_new() returns an newly allocates context or NULL is an
       error occurred.

       X509_STORE_CTX_init() returns 1 for success or 0	if an error occurred.

       X509_STORE_CTX_get0_param() returns a pointer to	an X509_VERIFY_PARAM
       structure or NULL if an error occurred.

       X509_STORE_CTX_cleanup(), X509_STORE_CTX_free(),
       X509_STORE_CTX_set0_trusted_stack(), X509_STORE_CTX_set_cert(),
       X509_STORE_CTX_set0_crls() and X509_STORE_CTX_set0_param() do not
       return values.

       X509_STORE_CTX_set_default() returns 1 for success or 0 if an error
       occurred.

       X509_STORE_CTX_get_num_untrusted() returns the number of	untrusted
       certificates used.

SEE ALSO
       X509_verify_cert(3) X509_VERIFY_PARAM_set_flags(3)

HISTORY
       X509_STORE_CTX_set0_crls() was first added to OpenSSL 1.0.0
       X509_STORE_CTX_get_num_untrusted() was first added to OpenSSL 1.1.0

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>.

1.1.1a				  2018-11-20		 X509_STORE_CTX_NEW(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | BUGS | RETURN VALUES | SEE ALSO | HISTORY | COPYRIGHT

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