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Zeroize temporary stack buffer

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
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Manuel Pégourié-Gonnard 2020-06-17 12:40:57 +02:00
parent f1aca9fdba
commit 8745986699
1 changed files with 3 additions and 1 deletions
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4
library/ecp.c
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@ -289,10 +289,10 @@ static int ecp_drbg_random( void *p_rng, unsigned char *output, size_t output_le
ecp_drbg_context *ctx = p_rng; ecp_drbg_context *ctx = p_rng;
int ret; int ret;
size_t len_done = 0; size_t len_done = 0;
uint8_t tmp[HASH_BLOCK_BYTES];
while( len_done < output_len ) while( len_done < output_len )
{ {
uint8_t tmp[HASH_BLOCK_BYTES];
uint8_t use_len; uint8_t use_len;
/* We don't need to draw more that 255 blocks, so don't bother with /* We don't need to draw more that 255 blocks, so don't bother with
@ -314,6 +314,8 @@ static int ecp_drbg_random( void *p_rng, unsigned char *output, size_t output_le
len_done += use_len; len_done += use_len;
} }
mbedtls_zeroize( tmp, sizeof( tmp ) );
return( 0 ); return( 0 );
} }