Kenji Arai / mbed-os_TYBLE16

mbed-os5 only for TYBLE16

Dependents:   TYBLE16_simple_data_logger TYBLE16_MP3_Air

features/cryptocell/FEATURE_CRYPTOCELL310/trng.c@1:9db0e321a9f4, 2019-12-31 (annotated)

Committer:
kenjiArai
Date:
Tue Dec 31 06:02:27 2019 +0000
Revision:
1:9db0e321a9f4
Parent:
0:5b88d5760320 
updated based on mbed-os5.15.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:5b88d5760320 1 /*
kenjiArai 0:5b88d5760320 2 * trng.c
kenjiArai 0:5b88d5760320 3 *
kenjiArai 0:5b88d5760320 4 * Copyright (C) 2017, Arm Limited, All Rights Reserved
kenjiArai 0:5b88d5760320 5 * SPDX-License-Identifier: Apache-2.0
kenjiArai 0:5b88d5760320 6 *
kenjiArai 0:5b88d5760320 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kenjiArai 0:5b88d5760320 8 * not use this file except in compliance with the License.
kenjiArai 0:5b88d5760320 9 * You may obtain a copy of the License at
kenjiArai 0:5b88d5760320 10 *
kenjiArai 0:5b88d5760320 11 * http://www.apache.org/licenses/LICENSE-2.0
kenjiArai 0:5b88d5760320 12 *
kenjiArai 0:5b88d5760320 13 * Unless required by applicable law or agreed to in writing, software
kenjiArai 0:5b88d5760320 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kenjiArai 0:5b88d5760320 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kenjiArai 0:5b88d5760320 16 * See the License for the specific language governing permissions and
kenjiArai 0:5b88d5760320 17 * limitations under the License.
kenjiArai 0:5b88d5760320 18 *
kenjiArai 0:5b88d5760320 19 */
kenjiArai 0:5b88d5760320 20
kenjiArai 0:5b88d5760320 21 #if DEVICE_TRNG
kenjiArai 0:5b88d5760320 22
kenjiArai 0:5b88d5760320 23 #include <string.h>
kenjiArai 0:5b88d5760320 24 #include "trng_api.h"
kenjiArai 0:5b88d5760320 25 #include "mbedtls/platform.h"
kenjiArai 0:5b88d5760320 26
kenjiArai 0:5b88d5760320 27 extern mbedtls_platform_context plat_ctx;
kenjiArai 0:5b88d5760320 28 static CRYS_RND_WorkBuff_t rndWorkBuff = { { 0 } };
kenjiArai 0:5b88d5760320 29
kenjiArai 0:5b88d5760320 30 /* Implementation that should never be optimized out by the compiler */
kenjiArai 0:5b88d5760320 31 static void mbedtls_zeroize( void *v, size_t n ) {
kenjiArai 0:5b88d5760320 32 volatile unsigned char *p = (unsigned char*)v;
kenjiArai 0:5b88d5760320 33 while( n-- ) *p++ = 0;
kenjiArai 0:5b88d5760320 34 }
kenjiArai 0:5b88d5760320 35
kenjiArai 0:5b88d5760320 36 CRYSError_t RNG_PLAT_SetUserRngParameters(
kenjiArai 0:5b88d5760320 37 CRYS_RND_State_t *pRndState,
kenjiArai 0:5b88d5760320 38 CRYS_RND_Params_t *pTrngParams);
kenjiArai 0:5b88d5760320 39
kenjiArai 0:5b88d5760320 40 CRYSError_t LLF_RND_GetTrngSource(
kenjiArai 0:5b88d5760320 41 CRYS_RND_State_t *rndState_ptr,
kenjiArai 0:5b88d5760320 42 CRYS_RND_Params_t *trngParams_ptr,
kenjiArai 0:5b88d5760320 43 SaSiBool_t isContinued,
kenjiArai 0:5b88d5760320 44 uint32_t *entropySize_ptr,
kenjiArai 0:5b88d5760320 45 uint32_t **sourceOut_ptr_ptr,
kenjiArai 0:5b88d5760320 46 uint32_t *sourceOutSize_ptr,
kenjiArai 0:5b88d5760320 47 uint32_t *rndWorkBuff_ptr);
kenjiArai 0:5b88d5760320 48
kenjiArai 0:5b88d5760320 49
kenjiArai 0:5b88d5760320 50 void trng_init(trng_t *obj)
kenjiArai 0:5b88d5760320 51 {
kenjiArai 0:5b88d5760320 52 RNG_PLAT_SetUserRngParameters(&plat_ctx.platform_impl_ctx.rndState, obj);
kenjiArai 0:5b88d5760320 53 }
kenjiArai 0:5b88d5760320 54
kenjiArai 0:5b88d5760320 55 void trng_free(trng_t *obj)
kenjiArai 0:5b88d5760320 56 {
kenjiArai 0:5b88d5760320 57 (void)obj;
kenjiArai 0:5b88d5760320 58 }
kenjiArai 0:5b88d5760320 59
kenjiArai 0:5b88d5760320 60
kenjiArai 0:5b88d5760320 61 int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *outputLength)
kenjiArai 0:5b88d5760320 62 {
kenjiArai 0:5b88d5760320 63 (void)obj;
kenjiArai 0:5b88d5760320 64 int ret;
kenjiArai 0:5b88d5760320 65 uint32_t entropySizeBits;
kenjiArai 0:5b88d5760320 66 uint32_t *entrSource_ptr;
kenjiArai 0:5b88d5760320 67 uint32_t actualLength;
kenjiArai 0:5b88d5760320 68
kenjiArai 0:5b88d5760320 69 ret = LLF_RND_GetTrngSource(
kenjiArai 0:5b88d5760320 70 &plat_ctx.platform_impl_ctx.rndState , /*in/out*/
kenjiArai 0:5b88d5760320 71 obj, /*in/out*/
kenjiArai 0:5b88d5760320 72 0, /*in*/
kenjiArai 0:5b88d5760320 73 &entropySizeBits, /*in/out*/
kenjiArai 0:5b88d5760320 74 &entrSource_ptr, /*out*/
kenjiArai 0:5b88d5760320 75 &actualLength, /*out*/
kenjiArai 0:5b88d5760320 76 (uint32_t*)&rndWorkBuff.crysRndWorkBuff /*in*/);
kenjiArai 0:5b88d5760320 77 if ( ret != 0 )
kenjiArai 0:5b88d5760320 78 return -1;
kenjiArai 0:5b88d5760320 79
kenjiArai 0:5b88d5760320 80 if ( length < actualLength )
kenjiArai 0:5b88d5760320 81 actualLength = length;
kenjiArai 0:5b88d5760320 82
kenjiArai 0:5b88d5760320 83 *outputLength = actualLength;
kenjiArai 0:5b88d5760320 84
kenjiArai 0:5b88d5760320 85 memcpy( output, entrSource_ptr + CRYS_RND_TRNG_SRC_INNER_OFFSET_WORDS, *outputLength );
kenjiArai 0:5b88d5760320 86 mbedtls_zeroize( entrSource_ptr + CRYS_RND_TRNG_SRC_INNER_OFFSET_WORDS, *outputLength );
kenjiArai 0:5b88d5760320 87 return 0;
kenjiArai 0:5b88d5760320 88 }
kenjiArai 0:5b88d5760320 89
kenjiArai 0:5b88d5760320 90 #endif //DEVICE_TRNG