mirror of https://github.com/ARMmbed/mbed-os.git
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
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* trng.c
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*
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* Copyright (C) 2017, 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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#if DEVICE_TRNG
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#include <string.h>
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#include "trng_api.h"
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#include "mbedtls/platform.h"
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extern mbedtls_platform_context plat_ctx;
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static CRYS_RND_WorkBuff_t rndWorkBuff = { { 0 } };
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = (unsigned char*)v;
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while( n-- ) *p++ = 0;
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}
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CRYSError_t RNG_PLAT_SetUserRngParameters(
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CRYS_RND_State_t *pRndState,
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CRYS_RND_Params_t *pTrngParams);
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CRYSError_t LLF_RND_GetTrngSource(
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CRYS_RND_State_t *rndState_ptr,
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CRYS_RND_Params_t *trngParams_ptr,
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SaSiBool_t isContinued,
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uint32_t *entropySize_ptr,
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uint32_t **sourceOut_ptr_ptr,
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uint32_t *sourceOutSize_ptr,
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uint32_t *rndWorkBuff_ptr);
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void trng_init(trng_t *obj)
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{
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RNG_PLAT_SetUserRngParameters(&plat_ctx.platform_impl_ctx.rndState, obj);
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}
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void trng_free(trng_t *obj)
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{
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(void)obj;
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}
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int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *outputLength)
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{
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(void)obj;
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int ret;
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uint32_t entropySizeBits;
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uint32_t *entrSource_ptr;
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uint32_t actualLength;
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ret = LLF_RND_GetTrngSource(
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&plat_ctx.platform_impl_ctx.rndState , /*in/out*/
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obj, /*in/out*/
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0, /*in*/
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&entropySizeBits, /*in/out*/
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&entrSource_ptr, /*out*/
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&actualLength, /*out*/
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(uint32_t*)&rndWorkBuff.crysRndWorkBuff /*in*/);
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if ( ret != 0 )
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return -1;
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if ( length < actualLength )
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actualLength = length;
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*outputLength = actualLength;
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memcpy( output, entrSource_ptr + CRYS_RND_TRNG_SRC_INNER_OFFSET_WORDS, *outputLength );
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mbedtls_zeroize( entrSource_ptr + CRYS_RND_TRNG_SRC_INNER_OFFSET_WORDS, *outputLength );
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return 0;
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}
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#endif //DEVICE_TRNG
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