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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
*/
/* Dispatch functions for chacha20 cipher */
#include <openssl/proverr.h>
#include "cipher_chacha20.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
#define CHACHA20_KEYLEN (CHACHA_KEY_SIZE)
#define CHACHA20_BLKLEN (1)
#define CHACHA20_IVLEN (CHACHA_CTR_SIZE)
#define CHACHA20_FLAGS (PROV_CIPHER_FLAG_CUSTOM_IV)
static OSSL_FUNC_cipher_newctx_fn chacha20_newctx;
static OSSL_FUNC_cipher_freectx_fn chacha20_freectx;
static OSSL_FUNC_cipher_get_params_fn chacha20_get_params;
static OSSL_FUNC_cipher_get_ctx_params_fn chacha20_get_ctx_params;
static OSSL_FUNC_cipher_set_ctx_params_fn chacha20_set_ctx_params;
static OSSL_FUNC_cipher_gettable_ctx_params_fn chacha20_gettable_ctx_params;
static OSSL_FUNC_cipher_settable_ctx_params_fn chacha20_settable_ctx_params;
#define chacha20_cipher ossl_cipher_generic_cipher
#define chacha20_update ossl_cipher_generic_stream_update
#define chacha20_final ossl_cipher_generic_stream_final
#define chacha20_gettable_params ossl_cipher_generic_gettable_params
void ossl_chacha20_initctx(PROV_CHACHA20_CTX *ctx)
{
ossl_cipher_generic_initkey(ctx, CHACHA20_KEYLEN * 8,
CHACHA20_BLKLEN * 8,
CHACHA20_IVLEN * 8,
0, CHACHA20_FLAGS,
ossl_prov_cipher_hw_chacha20(CHACHA20_KEYLEN * 8),
NULL);
}
static void *chacha20_newctx(void *provctx)
{
PROV_CHACHA20_CTX *ctx;
if (!ossl_prov_is_running())
return NULL;
ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
ossl_chacha20_initctx(ctx);
return ctx;
}
static void chacha20_freectx(void *vctx)
{
PROV_CHACHA20_CTX *ctx = (PROV_CHACHA20_CTX *)vctx;
if (ctx != NULL) {
ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
OPENSSL_clear_free(ctx, sizeof(*ctx));
}
}
static int chacha20_get_params(OSSL_PARAM params[])
{
return ossl_cipher_generic_get_params(params, 0, CHACHA20_FLAGS,
CHACHA20_KEYLEN * 8,
CHACHA20_BLKLEN * 8,
CHACHA20_IVLEN * 8);
}
static int chacha20_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_IVLEN)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_KEYLEN)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
return 1;
}
static const OSSL_PARAM chacha20_known_gettable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
OSSL_PARAM_END
};
const OSSL_PARAM *chacha20_gettable_ctx_params(ossl_unused void *cctx,
ossl_unused void *provctx)
{
return chacha20_known_gettable_ctx_params;
}
static int chacha20_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
const OSSL_PARAM *p;
size_t len;
if (params == NULL)
return 1;
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
if (p != NULL) {
if (!OSSL_PARAM_get_size_t(p, &len)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
if (len != CHACHA20_KEYLEN) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
}
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN);
if (p != NULL) {
if (!OSSL_PARAM_get_size_t(p, &len)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
if (len != CHACHA20_IVLEN) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
return 0;
}
}
return 1;
}
static const OSSL_PARAM chacha20_known_settable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
OSSL_PARAM_END
};
const OSSL_PARAM *chacha20_settable_ctx_params(ossl_unused void *cctx,
ossl_unused void *provctx)
{
return chacha20_known_settable_ctx_params;
}
int ossl_chacha20_einit(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen,
const OSSL_PARAM params[])
{
int ret;
/* The generic function checks for ossl_prov_is_running() */
ret = ossl_cipher_generic_einit(vctx, key, keylen, iv, ivlen, NULL);
if (ret && iv != NULL) {
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
PROV_CIPHER_HW_CHACHA20 *hw = (PROV_CIPHER_HW_CHACHA20 *)ctx->hw;
hw->initiv(ctx);
}
if (ret && !chacha20_set_ctx_params(vctx, params))
ret = 0;
return ret;
}
int ossl_chacha20_dinit(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen,
const OSSL_PARAM params[])
{
int ret;
/* The generic function checks for ossl_prov_is_running() */
ret = ossl_cipher_generic_dinit(vctx, key, keylen, iv, ivlen, NULL);
if (ret && iv != NULL) {
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
PROV_CIPHER_HW_CHACHA20 *hw = (PROV_CIPHER_HW_CHACHA20 *)ctx->hw;
hw->initiv(ctx);
}
if (ret && !chacha20_set_ctx_params(vctx, params))
ret = 0;
return ret;
}
/* ossl_chacha20_functions */
const OSSL_DISPATCH ossl_chacha20_functions[] = {
{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_newctx },
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_freectx },
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))ossl_chacha20_einit },
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))ossl_chacha20_dinit },
{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))chacha20_update },
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))chacha20_final },
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))chacha20_cipher},
{ OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void))chacha20_get_params },
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, (void (*)(void))chacha20_gettable_params },
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))chacha20_get_ctx_params },
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
(void (*)(void))chacha20_gettable_ctx_params },
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, (void (*)(void))chacha20_set_ctx_params },
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,
(void (*)(void))chacha20_settable_ctx_params },
{ 0, NULL }
};
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