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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 <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/params.h>
#include <openssl/proverr.h>
#include "prov/blake2.h"
#include "internal/cryptlib.h"
#include "prov/implementations.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 blake2_mac_new;
static OSSL_FUNC_mac_dupctx_fn blake2_mac_dup;
static OSSL_FUNC_mac_freectx_fn blake2_mac_free;
static OSSL_FUNC_mac_gettable_ctx_params_fn blake2_gettable_ctx_params;
static OSSL_FUNC_mac_get_ctx_params_fn blake2_get_ctx_params;
static OSSL_FUNC_mac_settable_ctx_params_fn blake2_mac_settable_ctx_params;
static OSSL_FUNC_mac_set_ctx_params_fn blake2_mac_set_ctx_params;
static OSSL_FUNC_mac_init_fn blake2_mac_init;
static OSSL_FUNC_mac_update_fn blake2_mac_update;
static OSSL_FUNC_mac_final_fn blake2_mac_final;
struct blake2_mac_data_st {
BLAKE2_CTX ctx;
BLAKE2_PARAM params;
unsigned char key[BLAKE2_KEYBYTES];
};
static void *blake2_mac_new(void *unused_provctx)
{
struct blake2_mac_data_st *macctx;
if (!ossl_prov_is_running())
return NULL;
macctx = OPENSSL_zalloc(sizeof(*macctx));
if (macctx != NULL) {
BLAKE2_PARAM_INIT(&macctx->params);
/* ctx initialization is deferred to BLAKE2b_Init() */
}
return macctx;
}
static void *blake2_mac_dup(void *vsrc)
{
struct blake2_mac_data_st *dst;
struct blake2_mac_data_st *src = vsrc;
if (!ossl_prov_is_running())
return NULL;
dst = OPENSSL_zalloc(sizeof(*dst));
if (dst == NULL)
return NULL;
*dst = *src;
return dst;
}
static void blake2_mac_free(void *vmacctx)
{
struct blake2_mac_data_st *macctx = vmacctx;
if (macctx != NULL) {
OPENSSL_cleanse(macctx->key, sizeof(macctx->key));
OPENSSL_free(macctx);
}
}
static size_t blake2_mac_size(void *vmacctx)
{
struct blake2_mac_data_st *macctx = vmacctx;
return macctx->params.digest_length;
}
static int blake2_setkey(struct blake2_mac_data_st *macctx,
const unsigned char *key, size_t keylen)
{
if (keylen > BLAKE2_KEYBYTES || keylen == 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
memcpy(macctx->key, key, keylen);
/* Pad with zeroes at the end if required */
if (keylen < BLAKE2_KEYBYTES)
memset(macctx->key + keylen, 0, BLAKE2_KEYBYTES - keylen);
BLAKE2_PARAM_SET_KEY_LENGTH(&macctx->params, (uint8_t)keylen);
return 1;
}
static int blake2_mac_init(void *vmacctx, const unsigned char *key,
size_t keylen, const OSSL_PARAM params[])
{
struct blake2_mac_data_st *macctx = vmacctx;
if (!ossl_prov_is_running() || !blake2_mac_set_ctx_params(macctx, params))
return 0;
if (key != NULL) {
if (!blake2_setkey(macctx, key, keylen))
return 0;
} else if (macctx->params.key_length == 0) {
/* Check key has been set */
ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
return 0;
}
return BLAKE2_INIT_KEY(&macctx->ctx, &macctx->params, macctx->key);
}
static int blake2_mac_update(void *vmacctx,
const unsigned char *data, size_t datalen)
{
struct blake2_mac_data_st *macctx = vmacctx;
if (datalen == 0)
return 1;
return BLAKE2_UPDATE(&macctx->ctx, data, datalen);
}
static int blake2_mac_final(void *vmacctx,
unsigned char *out, size_t *outl,
size_t outsize)
{
struct blake2_mac_data_st *macctx = vmacctx;
if (!ossl_prov_is_running())
return 0;
*outl = blake2_mac_size(macctx);
return BLAKE2_FINAL(out, &macctx->ctx);
}
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
OSSL_PARAM_size_t(OSSL_MAC_PARAM_BLOCK_SIZE, NULL),
OSSL_PARAM_END
};
static const OSSL_PARAM *blake2_gettable_ctx_params(ossl_unused void *ctx,
ossl_unused void *provctx)
{
return known_gettable_ctx_params;
}
static int blake2_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
{
OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL
&& !OSSL_PARAM_set_size_t(p, blake2_mac_size(vmacctx)))
return 0;
if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_BLOCK_SIZE)) != NULL
&& !OSSL_PARAM_set_size_t(p, BLAKE2_BLOCKBYTES))
return 0;
return 1;
}
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
OSSL_PARAM_octet_string(OSSL_MAC_PARAM_CUSTOM, NULL, 0),
OSSL_PARAM_octet_string(OSSL_MAC_PARAM_SALT, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *blake2_mac_settable_ctx_params(
ossl_unused void *ctx, ossl_unused void *p_ctx)
{
return known_settable_ctx_params;
}
/*
* ALL parameters should be set before init().
*/
static int blake2_mac_set_ctx_params(void *vmacctx, const OSSL_PARAM params[])
{
struct blake2_mac_data_st *macctx = vmacctx;
const OSSL_PARAM *p;
if (params == NULL)
return 1;
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_SIZE)) != NULL) {
size_t size;
if (!OSSL_PARAM_get_size_t(p, &size)
|| size < 1
|| size > BLAKE2_OUTBYTES) {
ERR_raise(ERR_LIB_PROV, PROV_R_NOT_XOF_OR_INVALID_LENGTH);
return 0;
}
BLAKE2_PARAM_SET_DIGEST_LENGTH(&macctx->params, (uint8_t)size);
}
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL
&& !blake2_setkey(macctx, p->data, p->data_size))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_CUSTOM))
!= NULL) {
/*
* The OSSL_PARAM API doesn't provide direct pointer use, so we
* must handle the OSSL_PARAM structure ourselves here
*/
if (p->data_size > BLAKE2_PERSONALBYTES) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CUSTOM_LENGTH);
return 0;
}
BLAKE2_PARAM_SET_PERSONAL(&macctx->params, p->data, p->data_size);
}
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_SALT)) != NULL) {
/*
* The OSSL_PARAM API doesn't provide direct pointer use, so we
* must handle the OSSL_PARAM structure ourselves here as well
*/
if (p->data_size > BLAKE2_SALTBYTES) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
return 0;
}
BLAKE2_PARAM_SET_SALT(&macctx->params, p->data, p->data_size);
}
return 1;
}
const OSSL_DISPATCH BLAKE2_FUNCTIONS[] = {
{ OSSL_FUNC_MAC_NEWCTX, (void (*)(void))blake2_mac_new },
{ OSSL_FUNC_MAC_DUPCTX, (void (*)(void))blake2_mac_dup },
{ OSSL_FUNC_MAC_FREECTX, (void (*)(void))blake2_mac_free },
{ OSSL_FUNC_MAC_INIT, (void (*)(void))blake2_mac_init },
{ OSSL_FUNC_MAC_UPDATE, (void (*)(void))blake2_mac_update },
{ OSSL_FUNC_MAC_FINAL, (void (*)(void))blake2_mac_final },
{ OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
(void (*)(void))blake2_gettable_ctx_params },
{ OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))blake2_get_ctx_params },
{ OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
(void (*)(void))blake2_mac_settable_ctx_params },
{ OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))blake2_mac_set_ctx_params },
{ 0, NULL }
};
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