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add link to arc4random.c which was the inspiration for chacha_prng

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This commit is contained in:
Karel Miko 2017-04-03 20:04:00 +02:00
parent 7b93f04390
commit 2520e6c061
1 changed files with 6 additions and 0 deletions
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6
src/prngs/chacha.c
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@ -7,6 +7,10 @@
* guarantee it works. * guarantee it works.
*/ */
/* the idea of re-keying loosely follows the approach used in:
* http://bxr.su/OpenBSD/lib/libc/crypt/arc4random.c
*/
#include "tomcrypt.h" #include "tomcrypt.h"
#ifdef LTC_CHACHA20_PRNG #ifdef LTC_CHACHA20_PRNG
@ -64,6 +68,8 @@ int chacha_prng_add_entropy(const unsigned char *in, unsigned long inlen, prng_s
if ((err = chacha_setup(&prng->chacha.s, buf, 32, 20)) != CRYPT_OK) return err; if ((err = chacha_setup(&prng->chacha.s, buf, 32, 20)) != CRYPT_OK) return err;
/* iv 8 bytes */ /* iv 8 bytes */
if ((err = chacha_ivctr64(&prng->chacha.s, buf + 32, 8, 0)) != CRYPT_OK) return err; if ((err = chacha_ivctr64(&prng->chacha.s, buf + 32, 8, 0)) != CRYPT_OK) return err;
/* clear KEY + IV */
XMEMSET(buf, 0, 40);
} }
else { else {
/* chacha_prng_ready() was not called yet, add entropy to ent buffer */ /* chacha_prng_ready() was not called yet, add entropy to ent buffer */