From: Steffen Trumtrar <s.trumtrar@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Subject: [PATCH 2/5] lib: random: get_random_bytes from HWRNG if present
Date: Fri, 26 Feb 2016 13:04:44 +0100 [thread overview]
Message-ID: <1456488287-23404-3-git-send-email-s.trumtrar@pengutronix.de> (raw)
In-Reply-To: <1456488287-23404-1-git-send-email-s.trumtrar@pengutronix.de>
Instead of generating pseudo random numbers, get random bytes
from an optional HW generator, if enabled and registered.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
lib/random.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/lib/random.c b/lib/random.c
index 210fea99466e..ff82dd1bed85 100644
--- a/lib/random.c
+++ b/lib/random.c
@@ -1,5 +1,6 @@
#include <common.h>
#include <stdlib.h>
+#include <linux/hw_random.h>
static unsigned int random_seed;
@@ -22,6 +23,24 @@ void get_random_bytes(void *_buf, int len)
{
char *buf = _buf;
+ if (IS_ENABLED(CONFIG_HWRNG)) {
+ struct hwrng *rng;
+ int bytes;
+
+ rng = hwrng_get_first();
+ if (!PTR_ERR(rng)) {
+ while (len) {
+ bytes = hwrng_get_data(rng, _buf, len, 0);
+ if (!bytes)
+ goto sw_fallback;
+ len -= bytes;
+ }
+
+ return;
+ }
+ }
+
+sw_fallback:
while (len--)
*buf++ = rand() % 256;
}
--
2.7.0
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next prev parent reply other threads:[~2016-02-26 12:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-26 12:04 [PATCH 0/5] HWRNG: add support for HW Random Number Generators Steffen Trumtrar
2016-02-26 12:04 ` [PATCH 1/5] drivers: add simple hw_random implementation Steffen Trumtrar
2016-02-29 7:06 ` Sascha Hauer
2016-02-26 12:04 ` Steffen Trumtrar [this message]
2016-02-26 20:28 ` [PATCH 2/5] lib: random: get_random_bytes from HWRNG if present Jason Cooper
2016-02-29 13:45 ` Steffen Trumtrar
2016-02-26 12:04 ` [PATCH 3/5] ARM: imx25: clk: add rngb clock Steffen Trumtrar
2016-02-26 12:04 ` [PATCH 4/5] ARM: i.MX25: dtsi: add rng node Steffen Trumtrar
2016-02-26 12:04 ` [PATCH 5/5] hw_random: add driver for Freescale RNGC Steffen Trumtrar
2016-02-29 7:33 ` Sascha Hauer
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