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entropy_poll.c: Added looping logic to mbedtls_platform_entropy_poll().

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Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis 2023-09-06 15:00:58 +01:00
parent 7afebccf69
commit 2c6e561ff8
1 changed files with 10 additions and 9 deletions
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19
library/entropy_poll.c
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@ -56,7 +56,6 @@
int mbedtls_platform_entropy_poll(void *data, unsigned char *output, size_t len,
size_t *olen)
{
ULONG len_as_ulong = 0;
((void) data);
*olen = 0;
@ -65,16 +64,18 @@ int mbedtls_platform_entropy_poll(void *data, unsigned char *output, size_t len,
* 64-bit Windows platforms. Ensure len's value can be safely converted into
* a ULONG.
*/
if (FAILED(SizeTToULong(len, &len_as_ulong))) {
return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
}
while (len != 0) {
unsigned long ulong_bytes =
(len > ULONG_MAX) ? ULONG_MAX : (unsigned long) len;
if (!BCRYPT_SUCCESS(BCryptGenRandom(NULL, output, len_as_ulong,
BCRYPT_USE_SYSTEM_PREFERRED_RNG))) {
return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
}
if (!BCRYPT_SUCCESS(BCryptGenRandom(NULL, output, ulong_bytes,
BCRYPT_USE_SYSTEM_PREFERRED_RNG))) {
return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
}
*olen = len;
*olen += ulong_bytes;
len -= ulong_bytes;
}
return 0;
}