X509_STORE_new,
    X509_STORE_up_ref,
    X509_STORE_free — allocate
    and free X.509 certificate stores
#include
    <openssl/x509_vfy.h>
X509_STORE *
  
  X509_STORE_new(void);
int
  
  X509_STORE_up_ref(X509_STORE
    *store);
void
  
  X509_STORE_free(X509_STORE
    *store);
X509_STORE_new()
    allocates and initializes an empty X.509 certificate store and sets its
    reference count to 1.
X509_STORE_up_ref()
    increments the reference count of store by 1.
X509_STORE_free()
    decrements the reference count of store by 1. If the
    reference count reaches 0, all resources used by the store, including all
    certificates contained in it, are released and store
    itself is freed. If store is a
    NULL pointer, no action occurs.
X509_STORE_new() returns a newly created
    X509_STORE object or NULL if
    an error occurs.
X509_STORE_up_ref() returns 1 for success
    and 0 for failure.
PKCS7_verify(3),
    SSL_CTX_set_cert_store(3),
    X509_load_cert_file(3),
    X509_LOOKUP_hash_dir(3),
    X509_OBJECT_get0_X509(3),
    X509_STORE_CTX_new(3),
    X509_STORE_get_ex_new_index(3),
    X509_STORE_load_locations(3),
    X509_STORE_set1_param(3),
    X509_STORE_set_verify_cb(3),
    X509_verify_cert(3)
X509_STORE_new() and
    X509_STORE_free() first appeared in SSLeay 0.8.0 and
    have been available since OpenBSD 2.4.
X509_STORE_up_ref() first appeared in
    OpenSSL 1.1.0 and has been available since OpenBSD
    6.3.