[398] | 1 | /**
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| 2 | * \file havege.h
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| 3 | *
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| 4 | * \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion
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| 5 | */
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| 6 | /*
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| 7 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 8 | * SPDX-License-Identifier: Apache-2.0
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| 9 | *
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| 10 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 11 | * not use this file except in compliance with the License.
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| 12 | * You may obtain a copy of the License at
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| 13 | *
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| 14 | * http://www.apache.org/licenses/LICENSE-2.0
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| 15 | *
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| 16 | * Unless required by applicable law or agreed to in writing, software
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| 17 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 18 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 19 | * See the License for the specific language governing permissions and
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| 20 | * limitations under the License.
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| 21 | *
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| 22 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 23 | */
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| 24 | #ifndef MBEDTLS_HAVEGE_H
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| 25 | #define MBEDTLS_HAVEGE_H
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| 26 |
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| 27 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 28 | #include "config.h"
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| 29 | #else
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| 30 | #include MBEDTLS_CONFIG_FILE
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| 31 | #endif
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| 32 |
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| 33 | #include <stddef.h>
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| 34 |
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| 35 | #define MBEDTLS_HAVEGE_COLLECT_SIZE 1024
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| 36 |
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| 37 | #ifdef __cplusplus
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| 38 | extern "C" {
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| 39 | #endif
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| 40 |
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| 41 | /**
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| 42 | * \brief HAVEGE state structure
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| 43 | */
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| 44 | typedef struct mbedtls_havege_state
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| 45 | {
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| 46 | int PT1, PT2, offset[2];
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| 47 | int pool[MBEDTLS_HAVEGE_COLLECT_SIZE];
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| 48 | int WALK[8192];
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| 49 | }
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| 50 | mbedtls_havege_state;
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| 51 |
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| 52 | /**
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| 53 | * \brief HAVEGE initialization
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| 54 | *
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| 55 | * \param hs HAVEGE state to be initialized
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| 56 | */
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| 57 | void mbedtls_havege_init( mbedtls_havege_state *hs );
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| 58 |
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| 59 | /**
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| 60 | * \brief Clear HAVEGE state
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| 61 | *
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| 62 | * \param hs HAVEGE state to be cleared
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| 63 | */
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| 64 | void mbedtls_havege_free( mbedtls_havege_state *hs );
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| 65 |
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| 66 | /**
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| 67 | * \brief HAVEGE rand function
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| 68 | *
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| 69 | * \param p_rng A HAVEGE state
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| 70 | * \param output Buffer to fill
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| 71 | * \param len Length of buffer
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| 72 | *
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| 73 | * \return 0
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| 74 | */
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| 75 | int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len );
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| 76 |
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| 77 | #ifdef __cplusplus
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| 78 | }
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| 79 | #endif
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| 80 |
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| 81 | #endif /* havege.h */
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