On Thu, Dec 12, 2013 at 1:09 PM, José Vázquez Fernández < ppvazquez...@gmail.com> wrote:
> A couple of days ago found an old patch that adds rngd in busybox: > http://lists.busybox.net/pipermail/busybox/2008-August/066784.html > Because it is 5 years old will need some rework, but could be a good > alternative to rng-tools. > Also made a patch that has the option to select between /dev/hwrng > or /dev/urandom in the mentioned package. > The question is: which is the best option? > > http://www.issihosts.com/haveged/ Always the best option. Never run out of entropy ever. Also, ripped out of grsec ages ago: $ cat /proc/sys/kernel/random/poolsize 16384 $ cat /proc/sys/kernel/random/entropy_avail 10253 $ cat /usr/src/linux/myPatches/001-entropy-poolsize.patch --- linux-3.2.0-gentoo/drivers/char/random.c 2012-01-04 18:55:44.000000000 -0500 +++ linux/drivers/char/random.c 2012-01-06 04:23:56.683632647 -0500 @@ -261,8 +261,8 @@ /* * Configuration information */ -#define INPUT_POOL_WORDS 128 -#define OUTPUT_POOL_WORDS 32 +#define INPUT_POOL_WORDS 512 +#define OUTPUT_POOL_WORDS 128 #define SEC_XFER_SIZE 512 #define EXTRACT_SIZE 10 @@ -300,10 +300,10 @@ int poolwords; int tap1, tap2, tap3, tap4, tap5; } poolinfo_table[] = { - /* x^128 + x^103 + x^76 + x^51 +x^25 + x + 1 -- 105 */ + /* x^512 + x^411 + x^308 + x^208 +x^104 + x + 1 -- 225 */ + { 512, 411, 308, 208, 104, 1 }, + /* x^128 + x^103 + x^76 + x^51 + x^25 + x + 1 -- 105 */ { 128, 103, 76, 51, 25, 1 }, - /* x^32 + x^26 + x^20 + x^14 + x^7 + x + 1 -- 15 */ - { 32, 26, 20, 14, 7, 1 }, #if 0 /* x^2048 + x^1638 + x^1231 + x^819 + x^411 + x + 1 -- 115 */ { 2048, 1638, 1231, 819, 411, 1 }, @@ -1228,7 +1214,7 @@ #include <linux/sysctl.h> static int min_read_thresh = 8, min_write_thresh; -static int max_read_thresh = INPUT_POOL_WORDS * 32; +static int max_read_thresh = OUTPUT_POOL_WORDS * 32; static int max_write_thresh = INPUT_POOL_WORDS * 32; static char sysctl_bootid[16];
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