mbedtls/tests/include/test/random.h
Bence Szépkúti 869746577a Add Apache-2.0 headers to all source files
Also normalize the first line of the copyright headers.

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Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
2020-06-16 17:38:44 +02:00

108 lines
3 KiB
C

/**
* \file random.h
*
* \brief This file contains the prototypes of helper functions to generate
* random numbers for the purpose of testing.
*/
/*
* Copyright (C) 2020, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef TEST_RANDOM_H
#define TEST_RANDOM_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <stddef.h>
#include <stdint.h>
typedef struct
{
unsigned char *buf;
size_t length;
} mbedtls_test_rnd_buf_info;
/**
* Info structure for the pseudo random function
*
* Key should be set at the start to a test-unique value.
* Do not forget endianness!
* State( v0, v1 ) should be set to zero.
*/
typedef struct
{
uint32_t key[16];
uint32_t v0, v1;
} mbedtls_test_rnd_pseudo_info;
/**
* This function just returns data from rand().
* Although predictable and often similar on multiple
* runs, this does not result in identical random on
* each run. So do not use this if the results of a
* test depend on the random data that is generated.
*
* rng_state shall be NULL.
*/
int mbedtls_test_rnd_std_rand( void *rng_state,
unsigned char *output,
size_t len );
/**
* This function only returns zeros
*
* rng_state shall be NULL.
*/
int mbedtls_test_rnd_zero_rand( void *rng_state,
unsigned char *output,
size_t len );
/**
* This function returns random based on a buffer it receives.
*
* rng_state shall be a pointer to a rnd_buf_info structure.
*
* The number of bytes released from the buffer on each call to
* the random function is specified by per_call. (Can be between
* 1 and 4)
*
* After the buffer is empty it will return rand();
*/
int mbedtls_test_rnd_buffer_rand( void *rng_state,
unsigned char *output,
size_t len );
/**
* This function returns random based on a pseudo random function.
* This means the results should be identical on all systems.
* Pseudo random is based on the XTEA encryption algorithm to
* generate pseudorandom.
*
* rng_state shall be a pointer to a rnd_pseudo_info structure.
*/
int mbedtls_test_rnd_pseudo_rand( void *rng_state,
unsigned char *output,
size_t len );
#endif /* TEST_RANDOM_H */