2058d56fcc
Move helper functions to generate random numbers from helpers.functions to random.c. Signed-off-by: Ronald Cron <ronald.cron@arm.com>
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/**
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* \file random.h
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*
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* \brief This file contains the prototypes of helper functions to generate
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* random numbers for the purpose of testing.
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*/
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/* Copyright (C) 2020, 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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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef TEST_RANDOM_H
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#define TEST_RANDOM_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stddef.h>
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#include <stdint.h>
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typedef struct
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{
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unsigned char *buf;
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size_t length;
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} rnd_buf_info;
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/**
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* Info structure for the pseudo random function
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*
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* Key should be set at the start to a test-unique value.
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* Do not forget endianness!
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* State( v0, v1 ) should be set to zero.
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*/
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typedef struct
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{
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uint32_t key[16];
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uint32_t v0, v1;
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} rnd_pseudo_info;
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/**
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* This function just returns data from rand().
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* Although predictable and often similar on multiple
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* runs, this does not result in identical random on
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* each run. So do not use this if the results of a
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* test depend on the random data that is generated.
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*
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* rng_state shall be NULL.
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*/
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int rnd_std_rand( void *rng_state, unsigned char *output, size_t len );
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/**
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* This function only returns zeros
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*
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* rng_state shall be NULL.
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*/
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int rnd_zero_rand( void *rng_state, unsigned char *output, size_t len );
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/**
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* This function returns random based on a buffer it receives.
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*
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* rng_state shall be a pointer to a rnd_buf_info structure.
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*
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* The number of bytes released from the buffer on each call to
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* the random function is specified by per_call. (Can be between
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* 1 and 4)
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*
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* After the buffer is empty it will return rand();
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*/
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int rnd_buffer_rand( void *rng_state, unsigned char *output, size_t len );
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/**
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* This function returns random based on a pseudo random function.
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* This means the results should be identical on all systems.
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* Pseudo random is based on the XTEA encryption algorithm to
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* generate pseudorandom.
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*
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* rng_state shall be a pointer to a rnd_pseudo_info structure.
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*/
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int rnd_pseudo_rand( void *rng_state, unsigned char *output, size_t len );
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#endif /* TEST_RANDOM_H */
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