Added arcfour code needed for SMB password changing.

Jeremy (jallison@whistle.com)
(This used to be commit 8bc3d13b3d66fc533d5bc6abf3fc9d5c67d0f286)

2 files changed, 126 insertions, 0 deletions

diff --git a/source3/arcfour.c b/source3/arcfour.c
new file mode 100644
index 0000000000..a28d702a86
--- /dev/null
+++ b/source3/arcfour.c
@@ -0,0 +1,91 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+
+   a implementation of arcfour designed for use in the 
+   SMB password change protocol based on the description
+   in 'Applied Cryptography', 2nd Edition.
+
+   Copyright (C) Jeremy Allison 1997
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "arcfour.h"
+
+void set_arc4_key(unsigned char *data, int key_length, arc4_key *arckey)
+{
+  unsigned int i; 
+  unsigned char j;
+  unsigned char tc;
+  unsigned char *s_box = &arckey->s_box[0];
+
+  arckey->index_i = 0;
+  arckey->index_j = 0;
+  for(i = 0; i < 256; i++)
+    s_box[i] = (unsigned char)i;
+
+  j = 0;
+  for( i = 0; i < 256; i++)
+  {
+     j += (s_box[i] + data[i%key_length]);
+     tc = s_box[i];
+     s_box[i] = s_box[j];
+     s_box[j] = tc;
+  }
+}
+
+void arc4(arc4_key *arckey, unsigned char *data_in, unsigned char *data_out, 
+          int length)
+{
+  unsigned char tc;
+  int ind;
+  unsigned char i, j;
+  unsigned char t;
+  unsigned char *s_box = &arckey->s_box[0];
+
+  for( ind = 0; ind < length; ind++)
+  {
+    i = ++arckey->index_i;
+    j = arckey->index_j += s_box[i];
+    tc = s_box[i];
+    s_box[i] = s_box[j];
+    s_box[j] = tc;
+    t = s_box[i] + s_box[j];
+    *data_out++ = *data_in++ ^ s_box[t];
+  }
+}
+
+#if 0
+/* Test vector */
+unsigned char key_data[] = { 0x61, 0x8a, 0x63, 0xd2, 0xfb };
+unsigned char plaintext[] = { 0xdc, 0xee, 0x4c, 0xf9, 0x2c };
+unsigned char ciphertext[] = { 0xf1, 0x38, 0x29, 0xc9, 0xde };
+
+int main(int argc, char *argv[])
+{
+  unsigned char out[5];
+  arc4_key key;
+
+  set_arc4_key(key_data, 5, &key);
+  arc4(&key, plaintext, out, 5);
+
+  if(memcmp(out, ciphertext, 5) ==0)
+    printf("Test ok !\n");
+  else
+    printf("Test fail !\n");
+  return 0;
+}
+#endif
diff --git a/source3/arcfour.h b/source3/arcfour.h
new file mode 100644
index 0000000000..9e724fcda5
--- /dev/null
+++ b/source3/arcfour.h
@@ -0,0 +1,35 @@
+#ifndef _ARC4_H_
+#define _ARC4_H_
+
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+
+   a implementation of arcfour designed for use in the 
+   SMB password change protocol based on the description
+   in 'Applied Cryptography', 2nd Edition.
+
+   Copyright (C) Jeremy Allison 1997
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+typedef struct {
+  unsigned char s_box[256];
+  unsigned char index_i;
+  unsigned char index_j;
+} arc4_key;
+
+#endif /* _ARC4_H_ */