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Add documentation + reformat the code

pull/2253/head
adustm 2016-07-28 16:44:31 +02:00
parent 4c50ec2734
commit 824fff5d63
2 changed files with 40 additions and 37 deletions
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39
hal/targets/hal/TARGET_STM/TARGET_STM32F4/entropy_hardware_poll.c
View File

@ -30,21 +30,27 @@
/* RNG handler declaration */
RNG_HandleTypeDef RngHandle;
/*
* Get one byte of entropy from the RNG, assuming it is up and running.
/** rng_get_byte
* @brief Get one byte of entropy from the RNG, assuming it is up and running.
* @param pointer to the hardware generated random byte.
*/
static void rng_get_byte( unsigned char *byte )
{
*byte = (unsigned char)HAL_RNG_GetRandomNumber(&RngHandle);
}
/*
* Get len bytes of entropy from the hardware RNG.
/** mbedtls_hardware_poll
* @brief Get len bytes of entropy from the hardware RNG.
* @param data pointer will be NULL
* @param output pointer to the random generated bytes buffer
* @param len input is the requested length of bytes to be generated
* @param olen is the pointer to the length of bytes effectively generated
* @returns 0 if the generation went well. -1 in case of error
*/
int mbedtls_hardware_poll( void *data,
unsigned char *output, size_t len, size_t *olen )
int mbedtls_hardware_poll( void *data, unsigned char *output, size_t len, size_t *olen )
{
size_t i;
int ret;
((void) data);
@ -56,22 +62,17 @@ int mbedtls_hardware_poll( void *data,
HAL_RNG_Init(&RngHandle);
/* Get Random byte */
for( i = 0; i < len; i++ ){
for( uint32_t i = 0; i < len; i++ ){
rng_get_byte( output + i );
printf("output %i: %i\n",i,(int)*(output+i));
}
/* Just be extra sure that we didn't do it wrong */
if( ( __HAL_RNG_GET_FLAG(&RngHandle, (RNG_FLAG_CECS|RNG_FLAG_SECS)) ) != 0 )
{
ret = -1;
goto cleanup;
}
*olen = len;
ret = 0;
cleanup:
/* Just be extra sure that we didn't do it wrong */
if( ( __HAL_RNG_GET_FLAG(&RngHandle, (RNG_FLAG_CECS|RNG_FLAG_SECS)) ) != 0 ) {
ret = -1;
} else {
ret = 0;
}
/*Disable the RNG peripheral */
HAL_RNG_DeInit(&RngHandle);
/* RNG Peripheral clock disable - assume we're the only users of RNG */

38
hal/targets/hal/TARGET_STM/TARGET_STM32F7/entropy_hardware_poll.c
View File

@ -25,21 +25,27 @@
/* RNG handler declaration */
RNG_HandleTypeDef RngHandle;
/*
* Get one byte of entropy from the RNG, assuming it is up and running.
/** rng_get_byte
* @brief Get one byte of entropy from the RNG, assuming it is up and running.
* @param pointer to the hardware generated random byte.
*/
static void rng_get_byte( unsigned char *byte )
{
*byte = (unsigned char)HAL_RNG_GetRandomNumber(&RngHandle);
}
/*
* Get len bytes of entropy from the hardware RNG.
/** mbedtls_hardware_poll
* @brief Get len bytes of entropy from the hardware RNG.
* @param data pointer will be NULL
* @param output pointer to the random generated bytes buffer
* @param len input is the requested length of bytes to be generated
* @param olen is the pointer to the length of bytes effectively generated
* @returns 0 if the generation went well. -1 in case of error
*/
int mbedtls_hardware_poll( void *data,
unsigned char *output, size_t len, size_t *olen )
int mbedtls_hardware_poll( void *data, unsigned char *output, size_t len, size_t *olen )
{
size_t i;
int ret;
((void) data);
@ -50,22 +56,18 @@ int mbedtls_hardware_poll( void *data,
RngHandle.Instance = RNG;
HAL_RNG_Init(&RngHandle);
/* Get Random byte */
for( i = 0; i < len; i++ )
for( uint32_t i = 0; i < len; i++ ){
rng_get_byte( output + i );
/* Just be extra sure that we didn't do it wrong */
if( ( __HAL_RNG_GET_FLAG(&RngHandle, (RNG_FLAG_CECS|RNG_FLAG_SECS)) ) != 0 )
{
ret = -1;
goto cleanup;
}
*olen = len;
ret = 0;
cleanup:
/* Just be extra sure that we didn't do it wrong */
if( ( __HAL_RNG_GET_FLAG(&RngHandle, (RNG_FLAG_CECS|RNG_FLAG_SECS)) ) != 0 ) {
ret = -1;
} else {
ret = 0;
}
/*Disable the RNG peripheral */
HAL_RNG_DeInit(&RngHandle);
/* RNG Peripheral clock disable - assume we're the only users of RNG */