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-rw-r--r--source3/arcfour.c91
-rw-r--r--source3/arcfour.h35
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_ */