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Make the fallback behavior of mbedtls_test_rnd_buffer_rand optional

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If a fallback is not explicitly configured in the
mbedtls_test_rnd_buf_info structure, fail after the buffer is
exhausted.

There is no intended behavior change in this commit: all existing uses
of mbedtls_test_rnd_buffer_rand() have been updated to set
mbedtls_test_rnd_std_rand as the fallback.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-03-24 00:48:57 +01:00
parent ebf3a4b80f
commit bef3019ed5
6 changed files with 37 additions and 4 deletions
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14
tests/src/random.c
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@@ -35,6 +35,8 @@
#include <test/random.h>
#include <string.h>
#include <mbedtls/entropy.h>
int mbedtls_test_rnd_std_rand( void *rng_state,
unsigned char *output,
size_t len )
@@ -91,8 +93,16 @@ int mbedtls_test_rnd_buffer_rand( void *rng_state,
}
if( len - use_len > 0 )
return( mbedtls_test_rnd_std_rand( NULL, output + use_len,
len - use_len ) );
{
if( info->fallback_f_rng != NULL )
{
return( info->fallback_f_rng( info->fallback_p_rng,
output + use_len,
len - use_len ) );
}
else
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
}
return( 0 );
}