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/*
* Copyright 2018-2021 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
*/
#include <stdlib.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/params.h>
#include <openssl/engine.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "prov/provider_util.h"
#include "prov/providercommon.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_FUNC_mac_newctx_fn gmac_new;
static OSSL_FUNC_mac_dupctx_fn gmac_dup;
static OSSL_FUNC_mac_freectx_fn gmac_free;
static OSSL_FUNC_mac_gettable_params_fn gmac_gettable_params;
static OSSL_FUNC_mac_get_params_fn gmac_get_params;
static OSSL_FUNC_mac_settable_ctx_params_fn gmac_settable_ctx_params;
static OSSL_FUNC_mac_set_ctx_params_fn gmac_set_ctx_params;
static OSSL_FUNC_mac_init_fn gmac_init;
static OSSL_FUNC_mac_update_fn gmac_update;
static OSSL_FUNC_mac_final_fn gmac_final;
/* local GMAC pkey structure */
struct gmac_data_st {
void *provctx;
EVP_CIPHER_CTX *ctx; /* Cipher context */
PROV_CIPHER cipher;
};
static void gmac_free(void *vmacctx)
{
struct gmac_data_st *macctx = vmacctx;
if (macctx != NULL) {
EVP_CIPHER_CTX_free(macctx->ctx);
ossl_prov_cipher_reset(&macctx->cipher);
OPENSSL_free(macctx);
}
}
static void *gmac_new(void *provctx)
{
struct gmac_data_st *macctx;
if (!ossl_prov_is_running())
return NULL;
if ((macctx = OPENSSL_zalloc(sizeof(*macctx))) == NULL
|| (macctx->ctx = EVP_CIPHER_CTX_new()) == NULL) {
gmac_free(macctx);
return NULL;
}
macctx->provctx = provctx;
return macctx;
}
static void *gmac_dup(void *vsrc)
{
struct gmac_data_st *src = vsrc;
struct gmac_data_st *dst;
if (!ossl_prov_is_running())
return NULL;
dst = gmac_new(src->provctx);
if (dst == NULL)
return NULL;
if (!EVP_CIPHER_CTX_copy(dst->ctx, src->ctx)
|| !ossl_prov_cipher_copy(&dst->cipher, &src->cipher)) {
gmac_free(dst);
return NULL;
}
return dst;
}
static size_t gmac_size(void)
{
return EVP_GCM_TLS_TAG_LEN;
}
static int gmac_init(void *vmacctx)
{
return ossl_prov_is_running();
}
static int gmac_update(void *vmacctx, const unsigned char *data,
size_t datalen)
{
struct gmac_data_st *macctx = vmacctx;
EVP_CIPHER_CTX *ctx = macctx->ctx;
int outlen;
if (datalen == 0)
return 1;
while (datalen > INT_MAX) {
if (!EVP_EncryptUpdate(ctx, NULL, &outlen, data, INT_MAX))
return 0;
data += INT_MAX;
datalen -= INT_MAX;
}
return EVP_EncryptUpdate(ctx, NULL, &outlen, data, datalen);
}
static int gmac_final(void *vmacctx, unsigned char *out, size_t *outl,
size_t outsize)
{
struct gmac_data_st *macctx = vmacctx;
int hlen = 0;
if (!ossl_prov_is_running())
return 0;
if (!EVP_EncryptFinal_ex(macctx->ctx, out, &hlen))
return 0;
/* TODO(3.0) Use params */
hlen = gmac_size();
if (!EVP_CIPHER_CTX_ctrl(macctx->ctx, EVP_CTRL_AEAD_GET_TAG,
hlen, out))
return 0;
*outl = hlen;
return 1;
}
static const OSSL_PARAM known_gettable_params[] = {
OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
OSSL_PARAM_END
};
static const OSSL_PARAM *gmac_gettable_params(void *provctx)
{
return known_gettable_params;
}
static int gmac_get_params(OSSL_PARAM params[])
{
OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
return OSSL_PARAM_set_size_t(p, gmac_size());
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_PROPERTIES, NULL, 0),
OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
OSSL_PARAM_octet_string(OSSL_MAC_PARAM_IV, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *gmac_settable_ctx_params(ossl_unused void *provctx)
{
return known_settable_ctx_params;
}
/*
* ALL parameters should be set before init().
*/
static int gmac_set_ctx_params(void *vmacctx, const OSSL_PARAM params[])
{
struct gmac_data_st *macctx = vmacctx;
EVP_CIPHER_CTX *ctx = macctx->ctx;
OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(macctx->provctx);
const OSSL_PARAM *p;
if (ctx == NULL
|| !ossl_prov_cipher_load_from_params(&macctx->cipher, params, provctx))
return 0;
if (EVP_CIPHER_mode(ossl_prov_cipher_cipher(&macctx->cipher))
!= EVP_CIPH_GCM_MODE) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
return 0;
}
if (!EVP_EncryptInit_ex(ctx, ossl_prov_cipher_cipher(&macctx->cipher),
ossl_prov_cipher_engine(&macctx->cipher), NULL,
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 (p->data_size != (size_t)EVP_CIPHER_CTX_key_length(ctx)) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
if (!EVP_EncryptInit_ex(ctx, NULL, NULL, p->data, NULL))
return 0;
}
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_IV)) != NULL) {
if (p->data_type != OSSL_PARAM_OCTET_STRING)
return 0;
if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN,
p->data_size, NULL)
|| !EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, p->data))
return 0;
}
return 1;
}
const OSSL_DISPATCH ossl_gmac_functions[] = {
{ OSSL_FUNC_MAC_NEWCTX, (void (*)(void))gmac_new },
{ OSSL_FUNC_MAC_DUPCTX, (void (*)(void))gmac_dup },
{ OSSL_FUNC_MAC_FREECTX, (void (*)(void))gmac_free },
{ OSSL_FUNC_MAC_INIT, (void (*)(void))gmac_init },
{ OSSL_FUNC_MAC_UPDATE, (void (*)(void))gmac_update },
{ OSSL_FUNC_MAC_FINAL, (void (*)(void))gmac_final },
{ OSSL_FUNC_MAC_GETTABLE_PARAMS, (void (*)(void))gmac_gettable_params },
{ OSSL_FUNC_MAC_GET_PARAMS, (void (*)(void))gmac_get_params },
{ OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
(void (*)(void))gmac_settable_ctx_params },
{ OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))gmac_set_ctx_params },
{ 0, NULL }
};
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