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core.h
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/* * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (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 */ #ifndef OPENSSL_CORE_H # define OPENSSL_CORE_H # pragma once # include <stddef.h> # include <openssl/types.h> # ifdef __cplusplus extern "C" { # endif /*- * Base types * ---------- * * These are the types that the OpenSSL core and providers have in common * to communicate data between them. */ /* Opaque handles to be used with core upcall functions from providers */ typedef struct ossl_core_handle_st OSSL_CORE_HANDLE; typedef struct openssl_core_ctx_st OPENSSL_CORE_CTX; typedef struct ossl_core_bio_st OSSL_CORE_BIO; /* * Dispatch table element. function_id numbers and the functions are defined * in core_dispatch.h, see macros with 'OSSL_CORE_MAKE_FUNC' in their names. * * An array of these is always terminated by function_id == 0 */ struct ossl_dispatch_st { int function_id; void (*function)(void); }; /* * Other items, essentially an int<->pointer map element. * * We make this type distinct from OSSL_DISPATCH to ensure that dispatch * tables remain tables with function pointers only. * * This is used whenever we need to pass things like a table of error reason * codes <-> reason string maps, ... * * Usage determines which field works as key if any, rather than field order. * * An array of these is always terminated by id == 0 && ptr == NULL */ struct ossl_item_st { unsigned int id; void *ptr; }; /* * Type to tie together algorithm names, property definition string and * the algorithm implementation in the form of a dispatch table. * * An array of these is always terminated by algorithm_names == NULL */ struct ossl_algorithm_st { const char *algorithm_names; /* key */ const char *property_definition; /* key */ const OSSL_DISPATCH *implementation; const char *algorithm_description; }; /* * Type to pass object data in a uniform way, without exposing the object * structure. * * An array of these is always terminated by key == NULL */ struct ossl_param_st { const char *key; /* the name of the parameter */ unsigned int data_type; /* declare what kind of content is in buffer */ void *data; /* value being passed in or out */ size_t data_size; /* data size */ size_t return_size; /* returned content size */ }; /* Currently supported OSSL_PARAM data types */ /* * OSSL_PARAM_INTEGER and OSSL_PARAM_UNSIGNED_INTEGER * are arbitrary length and therefore require an arbitrarily sized buffer, * since they may be used to pass numbers larger than what is natively * available. * * The number must be buffered in native form, i.e. MSB first on B_ENDIAN * systems and LSB first on L_ENDIAN systems. This means that arbitrary * native integers can be stored in the buffer, just make sure that the * buffer size is correct and the buffer itself is properly aligned (for * example by having the buffer field point at a C integer). */ # define OSSL_PARAM_INTEGER 1 # define OSSL_PARAM_UNSIGNED_INTEGER 2 /*- * OSSL_PARAM_REAL * is a C binary floating point values in native form and alignment. */ # define OSSL_PARAM_REAL 3 /*- * OSSL_PARAM_UTF8_STRING * is a printable string. It is expected to be printed as it is. */ # define OSSL_PARAM_UTF8_STRING 4 /*- * OSSL_PARAM_OCTET_STRING * is a string of bytes with no further specification. It is expected to be * printed as a hexdump. */ # define OSSL_PARAM_OCTET_STRING 5 /*- * OSSL_PARAM_UTF8_PTR * is a pointer to a printable string. It is expected to be printed as it is. * * The difference between this and OSSL_PARAM_UTF8_STRING is that only pointers * are manipulated for this type. * * This is more relevant for parameter requests, where the responding * function doesn't need to copy the data to the provided buffer, but * sets the provided buffer to point at the actual data instead. * * WARNING! Using these is FRAGILE, as it assumes that the actual * data and its location are constant. * * EXTRA WARNING! If you are not completely sure you most likely want * to use the OSSL_PARAM_UTF8_STRING type. */ # define OSSL_PARAM_UTF8_PTR 6 /*- * OSSL_PARAM_OCTET_PTR * is a pointer to a string of bytes with no further specification. It is * expected to be printed as a hexdump. * * The difference between this and OSSL_PARAM_OCTET_STRING is that only pointers * are manipulated for this type. * * This is more relevant for parameter requests, where the responding * function doesn't need to copy the data to the provided buffer, but * sets the provided buffer to point at the actual data instead. * * WARNING! Using these is FRAGILE, as it assumes that the actual * data and its location are constant. * * EXTRA WARNING! If you are not completely sure you most likely want * to use the OSSL_PARAM_OCTET_STRING type. */ # define OSSL_PARAM_OCTET_PTR 7 /* * Typedef for the thread stop handling callback. Used both internally and by * providers. * * Providers may register for notifications about threads stopping by * registering a callback to hear about such events. Providers register the * callback using the OSSL_FUNC_CORE_THREAD_START function in the |in| dispatch * table passed to OSSL_provider_init(). The arg passed back to a provider will * be the provider side context object. */ typedef void (*OSSL_thread_stop_handler_fn)(void *arg); /*- * Provider entry point * -------------------- * * This function is expected to be present in any dynamically loadable * provider module. By definition, if this function doesn't exist in a * module, that module is not an OpenSSL provider module. */ /*- * |handle| pointer to opaque type OSSL_CORE_HANDLE. This can be used * together with some functions passed via |in| to query data. * |in| is the array of functions that the Core passes to the provider. * |out| will be the array of base functions that the provider passes * back to the Core. * |provctx| a provider side context object, optionally created if the * provider needs it. This value is passed to other provider * functions, notably other context constructors. */ typedef int (OSSL_provider_init_fn)(const OSSL_CORE_HANDLE *handle, const OSSL_DISPATCH *in, const OSSL_DISPATCH **out, void **provctx); # ifdef __VMS # pragma names save # pragma names uppercase,truncated # endif OPENSSL_EXPORT OSSL_provider_init_fn OSSL_provider_init; # ifdef __VMS # pragma names restore # endif /* * Generic callback function signature. * * The expectation is that any provider function that wants to offer * a callback / hook can do so by taking an argument with this type, * as well as a pointer to caller-specific data. When calling the * callback, the provider function can populate an OSSL_PARAM array * with data of its choice and pass that in the callback call, along * with the caller data argument. * * libcrypto may use the OSSL_PARAM array to create arguments for an * application callback it knows about. */ typedef int (OSSL_CALLBACK)(const OSSL_PARAM params[], void *arg); typedef int (OSSL_INOUT_CALLBACK)(const OSSL_PARAM in_params[], OSSL_PARAM out_params[], void *arg); /* * Passphrase callback function signature * * This is similar to the generic callback function above, but adds a * result parameter. */ typedef int (OSSL_PASSPHRASE_CALLBACK)(char *pass, size_t pass_size, size_t *pass_len, const OSSL_PARAM params[], void *arg); # ifdef __cplusplus } # endif #endif