mirror of https://github.com/ARMmbed/mbed-os.git
78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
/*
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* shared_rng.cpp
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*
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* Copyright (C) 2019-2020, Arm Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include "shared_rng.h"
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#if defined(MBEDTLS_SSL_CONF_RNG)
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#include "mbed_trace.h"
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#define TRACE_GROUP "SRNG"
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mbedtls_hmac_drbg_context global_hmac_drbg;
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mbedtls_entropy_context global_entropy;
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static bool is_initialized = false;
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int init_global_rng()
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{
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mbedtls_entropy_init(&global_entropy);
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mbedtls_hmac_drbg_init(&global_hmac_drbg);
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int ret = mbedtls_hmac_drbg_seed(&global_hmac_drbg,
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mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
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mbedtls_entropy_func, &global_entropy, NULL, 0);
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if (ret != 0) {
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tr_error(" init_global_rng failed! mbedtls_hmac_drbg_seed returned -0x%x", -ret);
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free_global_rng();
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} else {
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is_initialized = true;
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}
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return ret;
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}
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void free_global_rng()
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{
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mbedtls_entropy_free(&global_entropy);
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mbedtls_hmac_drbg_free(&global_hmac_drbg);
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is_initialized = false;
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}
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int global_rng( void *ctx, unsigned char *dst, size_t len )
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{
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if (!is_initialized) {
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return MBED_SHARED_RNG_NOT_INITIALIZED;
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}
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return mbedtls_hmac_drbg_random(&global_hmac_drbg, dst, len);
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}
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mbedtls_hmac_drbg_context *get_global_hmac_drbg()
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{
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return &global_hmac_drbg;
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}
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mbedtls_entropy_context *get_global_entropy()
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{
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return &global_entropy;
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}
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#endif // MBEDTLS_SSL_CONF_RNG
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