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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