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X509_STORE_CTX_new(3)               OpenSSL              X509_STORE_CTX_new(3)

       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

       libcrypto, -lcrypto

        #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(X509_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);

       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

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

       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       no longer valid.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

       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 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_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.

       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.

       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.

       X509_STORE_CTX_new() returns a newly allocated context or NULL if 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

       X509_STORE_CTX_get_num_untrusted() returns the number of untrusted
       certificates used.

       X509_verify_cert(3) X509_VERIFY_PARAM_set_flags(3)

       The X509_STORE_CTX_set0_crls() function was added in OpenSSL 1.0.0.
       The X509_STORE_CTX_get_num_untrusted() function was added in OpenSSL

       Copyright 2009-2020 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

1.1.1i                            2020-12-10             X509_STORE_CTX_new(3)