[PATCH] net: lwip: Change https entropy requests

[Ilias Apalodimas]

mbedTLS requires some randomess in order to setup a TLS conection.
Since we don't have known APIs -- e.g /dev/urandom, we must define
our own function which mbedTLS uses.
The crypto library will call that function recursively until it gets all
the randomness it needs. Instead of doing it in 8b chunks fill in whatever
mbedTLS asks for in one call.

It's worth noting that 'len' in this function is controlled by mbedTLS
at build-time options and currently defaults to 128b.

Suggested-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
 net/lwip/wget.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/lwip/wget.c b/net/lwip/wget.c
index ba8579899002..4fd552fd306e 100644
--- a/net/lwip/wget.c
+++ b/net/lwip/wget.c
@@ -42,7 +42,6 @@ int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len,
 			  size_t *olen)
 {
 	struct udevice *dev;
-	u64 rng = 0;
 	int ret;
 
 	*olen = 0;
@@ -52,12 +51,11 @@ int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len,
 		log_err("Failed to get an rng: %d\n", ret);
 		return ret;
 	}
-	ret = dm_rng_read(dev, &rng, sizeof(rng));
+	ret = dm_rng_read(dev, output, len);
 	if (ret)
 		return ret;
 
-	memcpy(output, &rng, len);
-	*olen = sizeof(rng);
+	*olen = len;
 
 	return 0;
 }
-- 
2.45.2