diff mbox series

[2/2] hwrng: exynos - Set the quality value

Message ID 20200514190734.32746-3-l.stelmach@samsung.com (mailing list archive)
State Not Applicable
Headers show
Series [1/2] hwrng: iproc-rng200 - Set the quality value | expand

Commit Message

Lukasz Stelmach May 14, 2020, 7:07 p.m. UTC 
The value has been estimaded by obtainig 1024 chunks of data 128 bytes
(1024 bits) each from the generator and finding chunk with minimal
entropy using the ent(1) tool. The value was 6.332937 bits of entropy
in each 8 bits of data.

Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
---
 drivers/char/hw_random/exynos-trng.c | 1 +
 1 file changed, 1 insertion(+)

Comments

Stephan Mueller May 14, 2020, 8:20 p.m. UTC | #1 
Am Donnerstag, 14. Mai 2020, 21:07:34 CEST schrieb Łukasz Stelmach:

Hi Łukasz,

> The value has been estimaded by obtainig 1024 chunks of data 128 bytes
> (1024 bits) each from the generator and finding chunk with minimal
> entropy using the ent(1) tool. The value was 6.332937 bits of entropy
> in each 8 bits of data.

Dto - see the other comment.

Ciao
Stephan
diff mbox series

Patch

diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c
index 8e1fe3f8dd2d..ff6739272bf5 100644
--- a/drivers/char/hw_random/exynos-trng.c
+++ b/drivers/char/hw_random/exynos-trng.c
@@ -123,6 +123,7 @@  static int exynos_trng_probe(struct platform_device *pdev)
 	trng->rng.init = exynos_trng_init;
 	trng->rng.read = exynos_trng_do_read;
 	trng->rng.priv = (unsigned long) trng;
+	trng->rng.quality = 800;
 
 	platform_set_drvdata(pdev, trng);
 	trng->dev = &pdev->dev;