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/*
* Copyright 2018 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
*/
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_CMAC
# include <openssl/core_numbers.h>
# include <openssl/core_names.h>
# include <openssl/params.h>
# include <openssl/engine.h>
# include <openssl/evp.h>
# include <openssl/cmac.h>
# include "internal/provider_algs.h"
# include "internal/provider_ctx.h"
/*
* Forward declaration of everything implemented here. This is not strictly
* necessary for the compiler, but provides an assurance that the signatures
* of the functions in the dispatch table are correct.
*/
static OSSL_OP_mac_newctx_fn cmac_new;
static OSSL_OP_mac_dupctx_fn cmac_dup;
static OSSL_OP_mac_freectx_fn cmac_free;
static OSSL_OP_mac_gettable_ctx_params_fn cmac_gettable_ctx_params;
static OSSL_OP_mac_get_ctx_params_fn cmac_get_ctx_params;
static OSSL_OP_mac_settable_ctx_params_fn cmac_settable_ctx_params;
static OSSL_OP_mac_set_ctx_params_fn cmac_set_ctx_params;
static OSSL_OP_mac_init_fn cmac_init;
static OSSL_OP_mac_update_fn cmac_update;
static OSSL_OP_mac_final_fn cmac_final;
/* local CMAC data */
struct cmac_data_st {
void *provctx;
CMAC_CTX *ctx;
/*
* References to the underlying cipher implementation. tmpcipher
* caches the cipher, always. alloc_cipher only holds a reference
* to an explicitly fetched cipher.
* tmpcipher is cleared after a CMAC_Init call.
*/
const EVP_CIPHER *tmpcipher; /* cached CMAC cipher */
EVP_CIPHER *alloc_cipher; /* fetched CMAC cipher */
/*
* Conditions for legacy EVP_CIPHER uses.
* tmpengine is cleared after a CMAC_Init call.
*/
ENGINE *tmpengine; /* CMAC cipher engine (legacy) */
};
static void *cmac_new(void *provctx)
{
struct cmac_data_st *macctx;
if ((macctx = OPENSSL_zalloc(sizeof(*macctx))) == NULL
|| (macctx->ctx = CMAC_CTX_new()) == NULL) {
OPENSSL_free(macctx);
macctx = NULL;
}
macctx->provctx = provctx;
return macctx;
}
static void cmac_free(void *vmacctx)
{
struct cmac_data_st *macctx = vmacctx;
if (macctx != NULL) {
CMAC_CTX_free(macctx->ctx);
EVP_CIPHER_meth_free(macctx->alloc_cipher);
OPENSSL_free(macctx);
}
}
static void *cmac_dup(void *vsrc)
{
struct cmac_data_st *src = vsrc;
struct cmac_data_st *dst = cmac_new(src->provctx);
if (!CMAC_CTX_copy(dst->ctx, src->ctx)) {
cmac_free(dst);
return NULL;
}
if (src->alloc_cipher != NULL && !EVP_CIPHER_up_ref(src->alloc_cipher)) {
cmac_free(dst);
return NULL;
}
dst->tmpengine = src->tmpengine;
dst->tmpcipher = src->tmpcipher;
dst->alloc_cipher = src->alloc_cipher;
return dst;
}
static size_t cmac_size(void *vmacctx)
{
struct cmac_data_st *macctx = vmacctx;
return EVP_CIPHER_CTX_block_size(CMAC_CTX_get0_cipher_ctx(macctx->ctx));
}
static int cmac_init(void *vmacctx)
{
struct cmac_data_st *macctx = vmacctx;
int rv = CMAC_Init(macctx->ctx, NULL, 0, macctx->tmpcipher,
(ENGINE *)macctx->tmpengine);
macctx->tmpcipher = NULL;
macctx->tmpengine = NULL;
return rv;
}
static int cmac_update(void *vmacctx, const unsigned char *data,
size_t datalen)
{
struct cmac_data_st *macctx = vmacctx;
return CMAC_Update(macctx->ctx, data, datalen);
}
static int cmac_final(void *vmacctx, unsigned char *out, size_t *outl,
size_t outsize)
{
struct cmac_data_st *macctx = vmacctx;
return CMAC_Final(macctx->ctx, out, outl);
}
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
OSSL_PARAM_END
};
static const OSSL_PARAM *cmac_gettable_ctx_params(void)
{
return known_gettable_ctx_params;
}
static int cmac_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
{
OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
return OSSL_PARAM_set_size_t(p, cmac_size(vmacctx));
return 1;
}
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_CIPHER, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_ENGINE, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_PROPERTIES, NULL, 0),
OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *cmac_settable_ctx_params(void)
{
return known_settable_ctx_params;
}
/*
* ALL parameters should be set before init().
*/
static int cmac_set_ctx_params(void *vmacctx, const OSSL_PARAM params[])
{
struct cmac_data_st *macctx = vmacctx;
const OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_CIPHER)) != NULL) {
if (p->data_type != OSSL_PARAM_UTF8_STRING)
return 0;
{
const char *algoname = p->data;
const char *propquery = NULL;
#ifndef FIPS_MODE /* Inside the FIPS module, we don't support engines */
ENGINE_finish(macctx->tmpengine);
macctx->tmpengine = NULL;
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_ENGINE))
!= NULL) {
if (p->data_type != OSSL_PARAM_UTF8_STRING)
return 0;
macctx->tmpengine = ENGINE_by_id(p->data);
if (macctx->tmpengine == NULL)
return 0;
}
#endif
if ((p = OSSL_PARAM_locate_const(params,
OSSL_MAC_PARAM_PROPERTIES))
!= NULL) {
if (p->data_type != OSSL_PARAM_UTF8_STRING)
return 0;
propquery = p->data;
}
EVP_CIPHER_meth_free(macctx->alloc_cipher);
macctx->tmpcipher = macctx->alloc_cipher =
EVP_CIPHER_fetch(PROV_LIBRARY_CONTEXT_OF(macctx->provctx),
algoname, propquery);
#ifndef FIPS_MODE /* Inside the FIPS module, we don't support legacy digests */
/* TODO(3.0) BEGIN legacy stuff, to be removed */
if (macctx->tmpcipher == NULL)
macctx->tmpcipher = EVP_get_cipherbyname(algoname);
/* TODO(3.0) END of legacy stuff */
#endif
if (macctx->tmpcipher == NULL)
return 0;
}
}
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
if (p->data_type != OSSL_PARAM_OCTET_STRING)
return 0;
if (!CMAC_Init(macctx->ctx, p->data, p->data_size,
macctx->tmpcipher, macctx->tmpengine))
return 0;
macctx->tmpcipher = NULL;
macctx->tmpengine = NULL;
}
return 1;
}
const OSSL_DISPATCH cmac_functions[] = {
{ OSSL_FUNC_MAC_NEWCTX, (void (*)(void))cmac_new },
{ OSSL_FUNC_MAC_DUPCTX, (void (*)(void))cmac_dup },
{ OSSL_FUNC_MAC_FREECTX, (void (*)(void))cmac_free },
{ OSSL_FUNC_MAC_INIT, (void (*)(void))cmac_init },
{ OSSL_FUNC_MAC_UPDATE, (void (*)(void))cmac_update },
{ OSSL_FUNC_MAC_FINAL, (void (*)(void))cmac_final },
{ OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
(void (*)(void))cmac_gettable_ctx_params },
{ OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))cmac_get_ctx_params },
{ OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
(void (*)(void))cmac_settable_ctx_params },
{ OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))cmac_set_ctx_params },
{ 0, NULL }
};
#endif
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