+X509_STORE_set_check_revocation() sets the revocation checking
+function.
+Its purpose is to look through the final chain and check the
+revocation status for each certificate.
+It must return 0 on failure and 1 on success.
+I<If no function to get the issuer is provided, the internal default
+function will be used instead.>
+
+X509_STORE_set_get_crl() sets the function to get the crl for a given
+certificate B<x>.
+When found, the crl must be assigned to B<*crl>.
+This function must return 0 on failure and 1 on success.
+I<If no function to get the issuer is provided, the internal default
+function will be used instead.>
+
+X509_STORE_set_check_crl() sets the function to check the validity of
+the given B<crl>.
+This function must return 0 on failure and 1 on success.
+I<If no function to get the issuer is provided, the internal default
+function will be used instead.>
+
+X509_STORE_set_cert_crl() sets the function to check the revocation
+status of the given certificate B<x> against the given B<crl>.
+This function must return 0 on failure and 1 on success.
+I<If no function to get the issuer is provided, the internal default
+function will be used instead.>
+
+X509_STORE_set_check_policy() sets the function to check the policies
+of all the certificates in the final chain..
+This function must return 0 on failure and 1 on success.
+I<If no function to get the issuer is provided, the internal default
+function will be used instead.>
+
+X509_STORE_set_lookup_certs() and X509_STORE_set_lookup_crls() set the
+functions to look up all the certs or all the CRLs that match the
+given name B<nm>.
+These functions return NULL on failure and a pointer to a stack of
+certificates (B<X509>) or to a stack of CRLs (B<X509_CRL>) on
+success.
+I<If no function to get the issuer is provided, the internal default
+function will be used instead.>
+
+X509_STORE_set_cleanup() sets the final cleanup function, which is
+called when the context (B<X509_STORE_CTX>) is being torn down.
+This function doesn't return any value.
+I<If no function to get the issuer is provided, the internal default
+function will be used instead.>
+
+X509_STORE_get_verify_cb(), X509_STORE_CTX_get_verify(),
+X509_STORE_get_get_issuer(), X509_STORE_get_check_issued(),
+X509_STORE_get_check_revocation(), X509_STORE_get_get_crl(),
+X509_STORE_get_check_crl(), X509_STORE_set_verify(),
+X509_STORE_set_get_issuer(), X509_STORE_get_cert_crl(),
+X509_STORE_get_check_policy(), X509_STORE_get_lookup_certs(),
+X509_STORE_get_lookup_crls() and X509_STORE_get_cleanup() all return
+the function pointer assigned with X509_STORE_set_check_issued(),
+X509_STORE_set_check_revocation(), X509_STORE_set_get_crl(),
+X509_STORE_set_check_crl(), X509_STORE_set_cert_crl(),
+X509_STORE_set_check_policy(), X509_STORE_set_lookup_certs(),
+X509_STORE_set_lookup_crls() and X509_STORE_set_cleanup(), or NULL if
+no assignment has been made.
+
+X509_STORE_set_verify_cb_func(), X509_STORE_set_verify_func() and
+X509_STORE_set_lookup_crls_cb() are aliases for
+X509_STORE_set_verify_cb(), X509_STORE_set_verify() and
+X509_STORE_set_lookup_crls, available as macros for backward
+compatibility.