From 7b91c309b8275c407f86139beed588d14ca0bf11 Mon Sep 17 00:00:00 2001
From: Andrew Bartlett <abartlet@samba.org>
Date: Mon, 10 Jan 2005 22:52:01 +0000
Subject: r4657: This really should be made a structure, so we can't get it
 wrong, but in the meantime, get the declaration right...

Andrew Bartlett
(This used to be commit 1c65db94f03457335133210bda488e2e21209f9a)
---
 source4/lib/genrand.c | 60 ++++++++-------------------------------------------
 1 file changed, 9 insertions(+), 51 deletions(-)

(limited to 'source4/lib/genrand.c')

diff --git a/source4/lib/genrand.c b/source4/lib/genrand.c
index e11f37e0e9..a9ab260385 100644
--- a/source4/lib/genrand.c
+++ b/source4/lib/genrand.c
@@ -24,7 +24,7 @@
 #include "system/iconv.h"
 #include "lib/crypto/crypto.h"
 
-static unsigned char hash[258];
+static unsigned char s_box[258];
 static uint32 counter;
 
 static BOOL done_reseed = False;
@@ -54,59 +54,15 @@ static void get_rand_reseed_data(int *reseed_data)
 	}
 }
 
-/**************************************************************** 
- Setup the seed.
-*****************************************************************/
-
-static void seed_random_stream(unsigned char *seedval, size_t seedlen)
-{
-	unsigned char j = 0;
-	size_t ind;
-
-	for (ind = 0; ind < 256; ind++)
-		hash[ind] = (unsigned char)ind;
-
-	for( ind = 0; ind < 256; ind++) {
-		unsigned char tc;
-
-		j += (hash[ind] + seedval[ind%seedlen]);
-
-		tc = hash[ind];
-		hash[ind] = hash[j];
-		hash[j] = tc;
-	}
-
-	hash[256] = 0;
-	hash[257] = 0;
-}
-
 /**************************************************************** 
  Get datasize bytes worth of random data.
 *****************************************************************/
 
-static void get_random_stream(unsigned char *data, size_t datasize)
+static void get_random_stream(uint8_t sbox[258], unsigned char *data, size_t datasize)
 {
-	unsigned char index_i = hash[256];
-	unsigned char index_j = hash[257];
-	size_t ind;
-
-	for( ind = 0; ind < datasize; ind++) {
-		unsigned char tc;
-		unsigned char t;
-
-		index_i++;
-		index_j += hash[index_i];
-
-		tc = hash[index_i];
-		hash[index_i] = hash[index_j];
-		hash[index_j] = tc;
-
-		t = hash[index_i] + hash[index_j];
-		data[ind] = hash[t];
-	}
-
-	hash[256] = index_i;
-	hash[257] = index_j;
+	memset(data, '\0', datasize);
+	
+	arcfour_crypt_sbox(s_box, data, datasize);
 }
 
 /****************************************************************
@@ -147,6 +103,7 @@ static void do_filehash(const char *fname, unsigned char *the_hash)
 static int do_reseed(BOOL use_fd, int fd)
 {
 	unsigned char seed_inbuf[40];
+	DATA_BLOB seed_blob;
 	uint32 v1, v2; struct timeval tval; pid_t mypid;
 	int reseed_data = 0;
 
@@ -187,7 +144,8 @@ static int do_reseed(BOOL use_fd, int fd)
 			seed_inbuf[i] ^= ((char *)(&reseed_data))[i % sizeof(reseed_data)];
 	}
 
-	seed_random_stream(seed_inbuf, sizeof(seed_inbuf));
+	seed_blob = data_blob_const(seed_inbuf, sizeof(seed_inbuf));
+	arcfour_init(s_box, &seed_blob);
 
 	return -1;
 }
@@ -231,7 +189,7 @@ void generate_random_buffer(uint8_t *out, int len)
 	while(len > 0) {
 		int copy_len = len > 16 ? 16 : len;
 
-		get_random_stream(md4_buf, sizeof(md4_buf));
+		get_random_stream(s_box, md4_buf, sizeof(md4_buf));
 		mdfour(tmp_buf, md4_buf, sizeof(md4_buf));
 		memcpy(p, tmp_buf, copy_len);
 		p += copy_len;
-- 
cgit