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Fix psa_generate_random for >1024 bytes

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mbedtls_ctr_drbg_random can only return up to
MBEDTLS_CTR_DRBG_MAX_REQUEST (normally 1024) bytes at a time. So if
more than that is requested, call mbedtls_ctr_drbg_random in a loop.
This commit is contained in:
Gilles Peskine 2019-08-07 13:49:00 +02:00
parent bdc96fd636
commit f181eca350
1 changed files with 11 additions and 0 deletions
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11
library/psa_crypto.c
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@ -5650,6 +5650,17 @@ psa_status_t psa_generate_random( uint8_t *output,
int ret;
GUARD_MODULE_INITIALIZED;
while( output_size > MBEDTLS_CTR_DRBG_MAX_REQUEST )
{
ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg,
output,
MBEDTLS_CTR_DRBG_MAX_REQUEST );
if( ret != 0 )
return( mbedtls_to_psa_error( ret ) );
output += MBEDTLS_CTR_DRBG_MAX_REQUEST;
output_size -= MBEDTLS_CTR_DRBG_MAX_REQUEST;
}
ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg, output, output_size );
return( mbedtls_to_psa_error( ret ) );
}