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| -rw-r--r-- | source3/arcfour.c | 91 | ||||
| -rw-r--r-- | source3/arcfour.h | 35 |
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_ */ |