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tests: Move random helper functions

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Move helper functions to generate random numbers
from helpers.functions to random.c.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron
2020-06-09 17:11:47 +02:00
parent b7eb67fb74
commit 2058d56fcc
3 changed files with 154 additions and 141 deletions
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63
tests/include/test/random.h
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@ -32,4 +32,67 @@
#include MBEDTLS_CONFIG_FILE
#endif
#include <stddef.h>
#include <stdint.h>
typedef struct
{
unsigned char *buf;
size_t length;
} 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;
} 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 rnd_std_rand( void *rng_state, unsigned char *output, size_t len );
/**
* This function only returns zeros
*
* rng_state shall be NULL.
*/
int 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 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 rnd_pseudo_rand( void *rng_state, unsigned char *output, size_t len );
#endif /* TEST_RANDOM_H */