4 * \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion
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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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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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14 * http://www.apache.org/licenses/LICENSE-2.0
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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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22 * This file is part of mbed TLS (https://tls.mbed.org)
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24 #ifndef MBEDTLS_HAVEGE_H
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25 #define MBEDTLS_HAVEGE_H
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27 #if !defined(MBEDTLS_CONFIG_FILE)
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30 #include MBEDTLS_CONFIG_FILE
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35 #define MBEDTLS_HAVEGE_COLLECT_SIZE 1024
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42 * \brief HAVEGE state structure
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44 typedef struct mbedtls_havege_state
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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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50 mbedtls_havege_state;
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53 * \brief HAVEGE initialization
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55 * \param hs HAVEGE state to be initialized
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57 void mbedtls_havege_init( mbedtls_havege_state *hs );
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60 * \brief Clear HAVEGE state
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62 * \param hs HAVEGE state to be cleared
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64 void mbedtls_havege_free( mbedtls_havege_state *hs );
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67 * \brief HAVEGE rand function
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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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75 int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len );
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81 #endif /* havege.h */
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