91 lines
2.7 KiB
C
91 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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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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#ifndef TEST_RANDOM_H
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#define TEST_RANDOM_H
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#include "mbedtls/build_info.h"
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#include <stddef.h>
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#include <stdint.h>
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typedef struct {
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unsigned char *buf; /* Pointer to a buffer of length bytes. */
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size_t length;
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/* If fallback_f_rng is NULL, fail after delivering length bytes. */
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int (*fallback_f_rng)(void *, unsigned char *, size_t);
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void *fallback_p_rng;
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} mbedtls_test_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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uint32_t key[16];
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uint32_t v0, v1;
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} mbedtls_test_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 mbedtls_test_rnd_std_rand(void *rng_state,
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unsigned char *output,
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size_t len);
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/**
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* This function only returns zeros.
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*
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* \p rng_state shall be \c NULL.
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*/
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int mbedtls_test_rnd_zero_rand(void *rng_state,
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unsigned char *output,
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size_t len);
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/**
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* This function returns random data based on a buffer it receives.
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*
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* \p rng_state shall be a pointer to a #mbedtls_test_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 \p len.
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*
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* After the buffer is empty, this function will call the fallback RNG in the
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* #mbedtls_test_rnd_buf_info structure if there is one, and
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* will return #MBEDTLS_ERR_ENTROPY_SOURCE_FAILED otherwise.
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*/
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int mbedtls_test_rnd_buffer_rand(void *rng_state,
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unsigned char *output,
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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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* \p rng_state shall be a pointer to a #mbedtls_test_rnd_pseudo_info structure.
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*/
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int mbedtls_test_rnd_pseudo_rand(void *rng_state,
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unsigned char *output,
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size_t len);
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#endif /* TEST_RANDOM_H */
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