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/*
* Copyright 2018-2022 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 <string.h>
#include <stdarg.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/core.h>
#include <openssl/core_names.h>
#include <openssl/types.h>
#include "internal/nelem.h"
#include "crypto/evp.h"
#include "internal/provider.h"
#include "evp_local.h"
EVP_MAC_CTX *EVP_MAC_CTX_new(EVP_MAC *mac)
{
EVP_MAC_CTX *ctx = OPENSSL_zalloc(sizeof(EVP_MAC_CTX));
if (ctx == NULL
|| (ctx->algctx = mac->newctx(ossl_provider_ctx(mac->prov))) == NULL
|| !EVP_MAC_up_ref(mac)) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
if (ctx != NULL)
mac->freectx(ctx->algctx);
OPENSSL_free(ctx);
ctx = NULL;
} else {
ctx->meth = mac;
}
return ctx;
}
void EVP_MAC_CTX_free(EVP_MAC_CTX *ctx)
{
if (ctx == NULL)
return;
ctx->meth->freectx(ctx->algctx);
ctx->algctx = NULL;
/* refcnt-- */
EVP_MAC_free(ctx->meth);
OPENSSL_free(ctx);
}
EVP_MAC_CTX *EVP_MAC_CTX_dup(const EVP_MAC_CTX *src)
{
EVP_MAC_CTX *dst;
if (src->algctx == NULL)
return NULL;
dst = OPENSSL_malloc(sizeof(*dst));
if (dst == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
return NULL;
}
*dst = *src;
if (!EVP_MAC_up_ref(dst->meth)) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
OPENSSL_free(dst);
return NULL;
}
dst->algctx = src->meth->dupctx(src->algctx);
if (dst->algctx == NULL) {
EVP_MAC_CTX_free(dst);
return NULL;
}
return dst;
}
EVP_MAC *EVP_MAC_CTX_get0_mac(EVP_MAC_CTX *ctx)
{
return ctx->meth;
}
static size_t get_size_t_ctx_param(EVP_MAC_CTX *ctx, const char *name)
{
size_t sz = 0;
if (ctx->algctx != NULL) {
OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
params[0] = OSSL_PARAM_construct_size_t(name, &sz);
if (ctx->meth->get_ctx_params != NULL) {
if (ctx->meth->get_ctx_params(ctx->algctx, params))
return sz;
} else if (ctx->meth->get_params != NULL) {
if (ctx->meth->get_params(params))
return sz;
}
}
/*
* If the MAC hasn't been initialized yet, or there is no size to get,
* we return zero
*/
return 0;
}
size_t EVP_MAC_CTX_get_mac_size(EVP_MAC_CTX *ctx)
{
return get_size_t_ctx_param(ctx, OSSL_MAC_PARAM_SIZE);
}
size_t EVP_MAC_CTX_get_block_size(EVP_MAC_CTX *ctx)
{
return get_size_t_ctx_param(ctx, OSSL_MAC_PARAM_BLOCK_SIZE);
}
int EVP_MAC_init(EVP_MAC_CTX *ctx, const unsigned char *key, size_t keylen,
const OSSL_PARAM params[])
{
return ctx->meth->init(ctx->algctx, key, keylen, params);
}
int EVP_MAC_update(EVP_MAC_CTX *ctx, const unsigned char *data, size_t datalen)
{
return ctx->meth->update(ctx->algctx, data, datalen);
}
static int evp_mac_final(EVP_MAC_CTX *ctx, int xof,
unsigned char *out, size_t *outl, size_t outsize)
{
size_t l;
int res;
OSSL_PARAM params[2];
size_t macsize;
if (ctx == NULL || ctx->meth == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
return 0;
}
if (ctx->meth->final == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
macsize = EVP_MAC_CTX_get_mac_size(ctx);
if (out == NULL) {
if (outl == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
*outl = macsize;
return 1;
}
if (outsize < macsize) {
ERR_raise(ERR_LIB_EVP, EVP_R_BUFFER_TOO_SMALL);
return 0;
}
if (xof) {
params[0] = OSSL_PARAM_construct_int(OSSL_MAC_PARAM_XOF, &xof);
params[1] = OSSL_PARAM_construct_end();
if (EVP_MAC_CTX_set_params(ctx, params) <= 0) {
ERR_raise(ERR_LIB_EVP, EVP_R_SETTING_XOF_FAILED);
return 0;
}
}
res = ctx->meth->final(ctx->algctx, out, &l, outsize);
if (outl != NULL)
*outl = l;
return res;
}
int EVP_MAC_final(EVP_MAC_CTX *ctx,
unsigned char *out, size_t *outl, size_t outsize)
{
return evp_mac_final(ctx, 0, out, outl, outsize);
}
int EVP_MAC_finalXOF(EVP_MAC_CTX *ctx, unsigned char *out, size_t outsize)
{
return evp_mac_final(ctx, 1, out, NULL, outsize);
}
/*
* The {get,set}_params functions return 1 if there is no corresponding
* function in the implementation. This is the same as if there was one,
* but it didn't recognise any of the given params, i.e. nothing in the
* bag of parameters was useful.
*/
int EVP_MAC_get_params(EVP_MAC *mac, OSSL_PARAM params[])
{
if (mac->get_params != NULL)
return mac->get_params(params);
return 1;
}
int EVP_MAC_CTX_get_params(EVP_MAC_CTX *ctx, OSSL_PARAM params[])
{
if (ctx->meth->get_ctx_params != NULL)
return ctx->meth->get_ctx_params(ctx->algctx, params);
return 1;
}
int EVP_MAC_CTX_set_params(EVP_MAC_CTX *ctx, const OSSL_PARAM params[])
{
if (ctx->meth->set_ctx_params != NULL)
return ctx->meth->set_ctx_params(ctx->algctx, params);
return 1;
}
int evp_mac_get_number(const EVP_MAC *mac)
{
return mac->name_id;
}
const char *EVP_MAC_get0_name(const EVP_MAC *mac)
{
return mac->type_name;
}
const char *EVP_MAC_get0_description(const EVP_MAC *mac)
{
return mac->description;
}
int EVP_MAC_is_a(const EVP_MAC *mac, const char *name)
{
return mac != NULL && evp_is_a(mac->prov, mac->name_id, NULL, name);
}
int EVP_MAC_names_do_all(const EVP_MAC *mac,
void (*fn)(const char *name, void *data),
void *data)
{
if (mac->prov != NULL)
return evp_names_do_all(mac->prov, mac->name_id, fn, data);
return 1;
}
unsigned char *EVP_Q_mac(OSSL_LIB_CTX *libctx,
const char *name, const char *propq,
const char *subalg, const OSSL_PARAM *params,
const void *key, size_t keylen,
const unsigned char *data, size_t datalen,
unsigned char *out, size_t outsize, size_t *outlen)
{
EVP_MAC *mac = EVP_MAC_fetch(libctx, name, propq);
OSSL_PARAM subalg_param[] = { OSSL_PARAM_END, OSSL_PARAM_END };
EVP_MAC_CTX *ctx = NULL;
size_t len = 0;
unsigned char *res = NULL;
if (outlen != NULL)
*outlen = 0;
if (mac == NULL)
return NULL;
if (subalg != NULL) {
const OSSL_PARAM *defined_params = EVP_MAC_settable_ctx_params(mac);
const char *param_name = OSSL_MAC_PARAM_DIGEST;
/*
* The underlying algorithm may be a cipher or a digest.
* We don't know which it is, but we can ask the MAC what it
* should be and bet on that.
*/
if (OSSL_PARAM_locate_const(defined_params, param_name) == NULL) {
param_name = OSSL_MAC_PARAM_CIPHER;
if (OSSL_PARAM_locate_const(defined_params, param_name) == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_INVALID_ARGUMENT);
goto err;
}
}
subalg_param[0] =
OSSL_PARAM_construct_utf8_string(param_name, (char *)subalg, 0);
}
/* Single-shot - on NULL key input, set dummy key value for EVP_MAC_Init. */
if (key == NULL && keylen == 0)
key = data;
if ((ctx = EVP_MAC_CTX_new(mac)) != NULL
&& EVP_MAC_CTX_set_params(ctx, subalg_param)
&& EVP_MAC_CTX_set_params(ctx, params)
&& EVP_MAC_init(ctx, key, keylen, params)
&& EVP_MAC_update(ctx, data, datalen)
&& EVP_MAC_final(ctx, out, &len, outsize)) {
if (out == NULL) {
out = OPENSSL_malloc(len);
if (out != NULL && !EVP_MAC_final(ctx, out, NULL, len)) {
OPENSSL_free(out);
out = NULL;
}
}
res = out;
if (res != NULL && outlen != NULL)
*outlen = len;
}
err:
EVP_MAC_CTX_free(ctx);
EVP_MAC_free(mac);
return res;
}
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