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/*
* Copyright 2020-2021 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 AES CBC CTS ciphers */
#include <openssl/proverr.h>
#include "cipher_cts.h"
#define CTS_FLAGS PROV_CIPHER_FLAG_CTS
static OSSL_FUNC_cipher_encrypt_init_fn aes_cbc_cts_einit;
static OSSL_FUNC_cipher_decrypt_init_fn aes_cbc_cts_dinit;
static OSSL_FUNC_cipher_get_ctx_params_fn aes_cbc_cts_get_ctx_params;
static OSSL_FUNC_cipher_set_ctx_params_fn aes_cbc_cts_set_ctx_params;
static OSSL_FUNC_cipher_gettable_ctx_params_fn aes_cbc_cts_gettable_ctx_params;
static OSSL_FUNC_cipher_settable_ctx_params_fn aes_cbc_cts_settable_ctx_params;
CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(aes_cbc_cts)
OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_CTS_MODE, NULL, 0),
CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(aes_cbc_cts)
static int aes_cbc_cts_einit(void *ctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen,
const OSSL_PARAM params[])
{
if (!ossl_cipher_generic_einit(ctx, key, keylen, iv, ivlen, NULL))
return 0;
return aes_cbc_cts_set_ctx_params(ctx, params);
}
static int aes_cbc_cts_dinit(void *ctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen,
const OSSL_PARAM params[])
{
if (!ossl_cipher_generic_dinit(ctx, key, keylen, iv, ivlen, NULL))
return 0;
return aes_cbc_cts_set_ctx_params(ctx, params);
}
static int aes_cbc_cts_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_CTS_MODE);
if (p != NULL) {
const char *name = ossl_cipher_cbc_cts_mode_id2name(ctx->cts_mode);
if (name == NULL || !OSSL_PARAM_set_utf8_string(p, name)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
}
return ossl_cipher_generic_get_ctx_params(vctx, params);
}
CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(aes_cbc_cts)
OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_CTS_MODE, NULL, 0),
CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(aes_cbc_cts)
static int aes_cbc_cts_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
const OSSL_PARAM *p;
int id;
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_CTS_MODE);
if (p != NULL) {
if (p->data_type != OSSL_PARAM_UTF8_STRING)
goto err;
id = ossl_cipher_cbc_cts_mode_name2id(p->data);
if (id < 0)
goto err;
ctx->cts_mode = (unsigned int)id;
}
return ossl_cipher_generic_set_ctx_params(vctx, params);
err:
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
/* ossl_aes256cbc_cts_functions */
IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 256, 128, 128, block)
/* ossl_aes192cbc_cts_functions */
IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 192, 128, 128, block)
/* ossl_aes128cbc_cts_functions */
IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 128, 128, 128, block)
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