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Simplify the chunk loop in psa_generate_random

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Make the code slightly more readable and slightly smaller.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-01-04 21:01:07 +01:00
parent 88fa5c463e
commit 71ddab9154
1 changed files with 10 additions and 13 deletions
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23
library/psa_crypto.c
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@ -6394,21 +6394,18 @@ psa_status_t psa_generate_random( uint8_t *output,
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
while( output_size > MBEDTLS_PSA_RANDOM_MAX_REQUEST )
int ret = 0;
while( output_size > 0 )
{
ret = mbedtls_psa_get_random(
MBEDTLS_PSA_RANDOM_STATE,
output, MBEDTLS_PSA_RANDOM_MAX_REQUEST );
if( ret != 0 )
return( mbedtls_to_psa_error( ret ) );
output += MBEDTLS_PSA_RANDOM_MAX_REQUEST;
output_size -= MBEDTLS_PSA_RANDOM_MAX_REQUEST;
size_t request_size =
( output_size > MBEDTLS_PSA_RANDOM_MAX_REQUEST ?
MBEDTLS_PSA_RANDOM_MAX_REQUEST :
output_size );
ret = mbedtls_psa_get_random( MBEDTLS_PSA_RANDOM_STATE,
output, request_size );
output_size -= request_size;
output += request_size;
}
ret = mbedtls_psa_get_random( MBEDTLS_PSA_RANDOM_STATE,
output, output_size );
return( mbedtls_to_psa_error( ret ) );
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
}