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Discard the first 1024 bytes of output as suggested by

Browse Source 
http://citeseer.nj.nec.com/fluhrer01weaknesses.html and
http://citeseer.nj.nec.com/531224.html .

PR:		61126
Submitted by:	Jeff Ito <jeffi@rcn.com>
This commit is contained in:
David Schultz 2004-01-20 04:22:47 +00:00
parent 5ee30e277a
commit 60ce8b0e07
1 changed files with 13 additions and 1 deletions
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14
lib/libc/gen/arc4random.c
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@ -45,6 +45,8 @@ struct arc4_stream {
static int rs_initialized;
static struct arc4_stream rs;
static inline u_int8_t arc4_getbyte(struct arc4_stream *);
static inline void
arc4_init(as)
struct arc4_stream *as;
@ -80,7 +82,7 @@ static void
arc4_stir(as)
struct arc4_stream *as;
{
int fd;
int fd, n;
struct {
struct timeval tv;
pid_t pid;
@ -98,6 +100,16 @@ arc4_stir(as)
* stack... */
arc4_addrandom(as, (void *) &rdat, sizeof(rdat));
/*
* Throw away the first N bytes of output, as suggested in the
* paper "Weaknesses in the Key Scheduling Algorithm of RC4"
* by Fluher, Mantin, and Shamir. N=1024 is based on
* suggestions in the paper "(Not So) Random Shuffles of RC4"
* by Ilya Mironov.
*/
for (n = 0; n < 1024; n++)
arc4_getbyte(as);
}
static inline u_int8_t