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=pod
=head1 NAME
X509_STORE_CTX_new, X509_STORE_CTX_cleanup, X509_STORE_CTX_free, X509_STORE_CTX_init, X509_STORE_CTX_trusted_stack, X509_STORE_CTX_set_cert, X509_STORE_CTX_set_chain, X509_STORE_CTX_set0_crls, X509_STORE_CTX_get0_param, X509_STORE_CTX_set0_param, X509_STORE_CTX_set_default - X509_STORE_CTX initialisation
=head1 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_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx,X509 *x);
void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx,STACK_OF(X509) *sk);
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);
=head1 DESCRIPTION
These functions initialise an B<X509_STORE_CTX> structure for subsequent use
by X509_verify_cert().
X509_STORE_CTX_new() returns a newly initialised B<X509_STORE_CTX> structure.
X509_STORE_CTX_cleanup() internally cleans up an B<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 B<ctx>. After this call B<ctx>
is no longer valid.
X509_STORE_CTX_init() sets up B<ctx> for a subsequent verification operation.
The trusted certificate store is set to B<store>, the end entity certificate
to be verified is set to B<x509> and a set of additional certificates (which
will be untrusted but may be used to build the chain) in B<chain>. Any or
all of the B<store>, B<x509> and B<chain> parameters can be B<NULL>.
X509_STORE_CTX_trusted_stack() sets the set of trusted certificates of B<ctx>
to B<sk>. This is an alternative way of specifying trusted certificates
instead of using an B<X509_STORE>.
X509_STORE_CTX_set_cert() sets the certificate to be vertified in B<ctx> to
B<x>.
X509_STORE_CTX_set_chain() sets the additional certificate chain used by B<ctx>
to B<sk>.
X509_STORE_CTX_set0_crls() sets a set of CRLs to use to aid certificate
verification to B<sk>. These CRLs will only be used if CRL verification is
enabled in the associated B<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_VERIFY_PARAM *X509_STORE_CTX_get0_param() retrieves an intenal pointer
to the verification parameters associated with B<ctx>.
X509_STORE_CTX_set0_param() sets the intenal verification parameter pointer
to B<param>. After this call B<param> should not be used.
X509_STORE_CTX_set_default() looks up and sets the default verification
method to B<name>. This uses the function X509_VERIFY_PARAM_lookup() to
find an appropriate set of parameters from B<name>.
=head1 NOTES
The certificates and CRLs in a store are used internally and should B<not>
be freed up until after the associated B<X509_STORE_CTX> is freed. Legacy
applications might implicitly use an B<X509_STORE_CTX> like this:
X509_STORE_CTX ctx;
X509_STORE_CTX_init(&ctx, store, cert, chain);
this is B<not> recommended in new applications they should instead do:
X509_STORE_CTX *ctx;
ctx = X509_STORE_CTX_new();
if (ctx == NULL)
/* Bad error */
X509_STORE_CTX_init(ctx, store, cert, chain);
=head1 BUGS
The certificates and CRLs in a context are used internally and should B<not>
be freed up until after the associated B<X509_STORE_CTX> is freed. Copies
should be made or reference counts increased instead.
=head1 RETURN VALUES
X509_STORE_CTX_new() returns an newly allocates context or B<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 B<X509_VERIFY_PARAM>
structure or B<NULL> if an error occurred.
X509_STORE_CTX_cleanup(), X509_STORE_CTX_free(), X509_STORE_CTX_trusted_stack(),
X509_STORE_CTX_set_cert(), X509_STORE_CTX_set_chain(),
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.
=head1 SEE ALSO
L<X509_verify_cert(3)|X509_verify_cert(3)>
L<X509_VERIFY_PARAM_set_flags(3)|X509_VERIFY_PARAM_set_flags(3)>
=head1 HISTORY
X509_STORE_CTX_set0_crls() was first added to OpenSSL 1.0.0
=cut