diff options
Diffstat (limited to 'crypto/openssh/openbsd-compat/bsd-arc4random.c')
| -rw-r--r-- | crypto/openssh/openbsd-compat/bsd-arc4random.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/crypto/openssh/openbsd-compat/bsd-arc4random.c b/crypto/openssh/openbsd-compat/bsd-arc4random.c index 22003ff..5284e1a 100644 --- a/crypto/openssh/openbsd-compat/bsd-arc4random.c +++ b/crypto/openssh/openbsd-compat/bsd-arc4random.c @@ -17,7 +17,7 @@ #include "includes.h" #include "log.h" -RCSID("$Id: bsd-arc4random.c,v 1.8 2004/02/17 05:49:55 djm Exp $"); +RCSID("$Id: bsd-arc4random.c,v 1.9 2004/07/18 23:30:40 djm Exp $"); #ifndef HAVE_ARC4RANDOM @@ -56,13 +56,21 @@ unsigned int arc4random(void) void arc4random_stir(void) { unsigned char rand_buf[SEED_SIZE]; + int i; memset(&rc4, 0, sizeof(rc4)); if (RAND_bytes(rand_buf, sizeof(rand_buf)) <= 0) fatal("Couldn't obtain random bytes (error %ld)", ERR_get_error()); RC4_set_key(&rc4, sizeof(rand_buf), rand_buf); - RC4(&rc4, sizeof(rand_buf), rand_buf, rand_buf); + + /* + * Discard early keystream, as per recommendations in: + * http://www.wisdom.weizmann.ac.il/~itsik/RC4/Papers/Rc4_ksa.ps + */ + for(i = 0; i <= 256; i += sizeof(rand_buf)) + RC4(&rc4, sizeof(rand_buf), rand_buf, rand_buf); + memset(rand_buf, 0, sizeof(rand_buf)); rc4_ready = REKEY_BYTES; |
