![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to set_key.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [truecrypt] / truecrypt / crypto|
Return to set_key.c CVS log | Up to [truecrypt] / truecrypt / crypto |
1.1 root 1: /* crypto/des/set_key.c */
2: /* Copyright (C) 1995-1997 Eric Young ([email protected])
3: * All rights reserved.
4: *
5: * This package is an SSL implementation written
6: * by Eric Young ([email protected]).
7: * The implementation was written so as to conform with Netscapes SSL.
8: *
9: * This library is free for commercial and non-commercial use as long as
10: * the following conditions are aheared to. The following conditions
11: * apply to all code found in this distribution, be it the RC4, RSA,
12: * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13: * included with this distribution is covered by the same copyright terms
14: * except that the holder is Tim Hudson ([email protected]).
15: *
16: * Copyright remains Eric Young's, and as such any Copyright notices in
17: * the code are not to be removed.
18: * If this package is used in a product, Eric Young should be given attribution
19: * as the author of the parts of the library used.
20: * This can be in the form of a textual message at program startup or
21: * in documentation (online or textual) provided with the package.
22: *
23: * Redistribution and use in source and binary forms, with or without
24: * modification, are permitted provided that the following conditions
25: * are met:
26: * 1. Redistributions of source code must retain the copyright
27: * notice, this list of conditions and the following disclaimer.
28: * 2. Redistributions in binary form must reproduce the above copyright
29: * notice, this list of conditions and the following disclaimer in the
30: * documentation and/or other materials provided with the distribution.
31: * 3. All advertising materials mentioning features or use of this software
32: * must display the following acknowledgement:
33: * "This product includes cryptographic software written by
34: * Eric Young ([email protected])"
35: * The word 'cryptographic' can be left out if the rouines from the library
36: * being used are not cryptographic related :-).
37: * 4. If you include any Windows specific code (or a derivative thereof) from
38: * the apps directory (application code) you must include an acknowledgement:
39: * "This product includes software written by Tim Hudson ([email protected])"
40: *
41: * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51: * SUCH DAMAGE.
52: *
53: * The licence and distribution terms for any publically available version or
54: * derivative of this code cannot be changed. i.e. this code cannot simply be
55: * copied and put under another distribution licence
56: * [including the GNU Public Licence.]
57: */
58:
59: /* set_key.c v 1.4 eay 24/9/91
60: * 1.4 Speed up by 400% :-)
61: * 1.3 added register declarations.
62: * 1.2 unrolled make_key_sched a bit more
63: * 1.1 added norm_expand_bits
64: * 1.0 First working version
65: */
66:
1.1.1.2 ! root 67: /* Adapted for TrueCrypt by the TrueCrypt Foundation */
1.1 root 68:
1.1.1.2 ! root 69: #include "Des_locl.h"
! 70: #include "Podd.h"
! 71: #include "Sk.h"
1.1 root 72:
1.1.1.2 ! root 73: #ifdef LINUX_DRIVER
! 74: #include <linux/string.h>
! 75: #else
! 76: #pragma intrinsic(memcmp,_lrotr)
! 77: #endif
1.1 root 78:
79: #ifndef NOPROTO
80: static int check_parity(des_cblock (*key));
81: #else
82: static int check_parity();
83: #endif
84:
85: #pragma warning( disable : 4131 )
86:
1.1.1.2 ! root 87: int des_check_key=1;
1.1 root 88:
89: void des_set_odd_parity(key)
90: des_cblock (*key);
91: {
92: int i;
93:
1.1.1.2 ! root 94: for (i=0; i<(int)DES_KEY_SZ; i++)
1.1 root 95: (*key)[i]=odd_parity[(*key)[i]];
96: }
97:
98: static int check_parity(key)
99: des_cblock (*key);
100: {
101: int i;
102:
1.1.1.2 ! root 103: for (i=0; i<(int)DES_KEY_SZ; i++)
1.1 root 104: {
105: if ((*key)[i] != odd_parity[(*key)[i]])
106: return(0);
107: }
108: return(1);
109: }
110:
111: /* Weak and semi week keys as take from
112: * %A D.W. Davies
113: * %A W.L. Price
114: * %T Security for Computer Networks
115: * %I John Wiley & Sons
116: * %D 1984
117: * Many thanks to [email protected] (Steven Bellovin) for the reference
118: * (and actual cblock values).
119: */
120: #define NUM_WEAK_KEY 16
121: static des_cblock weak_keys[NUM_WEAK_KEY]={
122: /* weak keys */
123: {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
124: {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
125: {0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F},
126: {0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0},
127: /* semi-weak keys */
128: {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
129: {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
130: {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
131: {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
132: {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
133: {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
134: {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
135: {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
136: {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
137: {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
138: {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
139: {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
140:
141: int des_is_weak_key(key)
142: des_cblock (*key);
143: {
144: int i;
145:
146: for (i=0; i<NUM_WEAK_KEY; i++)
147: /* Added == 0 to comparision, I obviously don't run
148: * this section very often :-(, thanks to
149: * [email protected] for the fix
150: * eay 93/06/29
151: * Another problem, I was comparing only the first 4
152: * bytes, 97/03/18 */
153: if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1);
154: return(0);
155: }
156:
157: /* NOW DEFINED IN des_local.h
158: * See ecb_encrypt.c for a pseudo description of these macros.
159: * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
160: * (b)^=(t),\
161: * (a)=((a)^((t)<<(n))))
162: */
163:
164: #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
165: (a)=(a)^(t)^(t>>(16-(n))))
166:
167: /* return 0 if key parity is odd (correct),
168: * return -1 if key parity error,
169: * return -2 if illegal weak key.
170: */
171: int des_set_key(key, schedule)
172: des_cblock (*key);
173: des_key_schedule schedule;
174: {
175: static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
176: register DES_LONG c,d,t,s,t2;
177: register unsigned char *in;
178: register DES_LONG *k;
179: register int i;
180:
181: k=(DES_LONG *)schedule;
182: in=(unsigned char *)key;
183:
184: c2l(in,c);
185: c2l(in,d);
186:
187: /* do PC1 in 60 simple operations */
188: /* PERM_OP(d,c,t,4,0x0f0f0f0fL);
189: HPERM_OP(c,t,-2, 0xcccc0000L);
190: HPERM_OP(c,t,-1, 0xaaaa0000L);
191: HPERM_OP(c,t, 8, 0x00ff0000L);
192: HPERM_OP(c,t,-1, 0xaaaa0000L);
193: HPERM_OP(d,t,-8, 0xff000000L);
194: HPERM_OP(d,t, 8, 0x00ff0000L);
195: HPERM_OP(d,t, 2, 0x33330000L);
196: d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L);
197: d=(d>>8)|((c&0xf0000000L)>>4);
198: c&=0x0fffffffL; */
199:
200: /* I now do it in 47 simple operations :-)
201: * Thanks to John Fletcher ([email protected])
202: * for the inspiration. :-) */
203: PERM_OP (d,c,t,4,0x0f0f0f0fL);
204: HPERM_OP(c,t,-2,0xcccc0000L);
205: HPERM_OP(d,t,-2,0xcccc0000L);
206: PERM_OP (d,c,t,1,0x55555555L);
207: PERM_OP (c,d,t,8,0x00ff00ffL);
208: PERM_OP (d,c,t,1,0x55555555L);
209: d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
210: ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
211: c&=0x0fffffffL;
212:
213: for (i=0; i<ITERATIONS; i++)
214: {
215: if (shifts2[i])
216: { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
217: else
218: { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
219: c&=0x0fffffffL;
220: d&=0x0fffffffL;
221: /* could be a few less shifts but I am to lazy at this
222: * point in time to investigate */
223: s= des_skb[0][ (c )&0x3f ]|
224: des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]|
225: des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]|
226: des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) |
227: ((c>>22L)&0x38)];
228: t= des_skb[4][ (d )&0x3f ]|
229: des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
230: des_skb[6][ (d>>15L)&0x3f ]|
231: des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
232:
233: /* table contained 0213 4657 */
234: t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
235: *(k++)=ROTATE(t2,30)&0xffffffffL;
236:
237: t2=((s>>16L)|(t&0xffff0000L));
238: *(k++)=ROTATE(t2,26)&0xffffffffL;
239: }
1.1.1.2 ! root 240:
! 241: if (des_check_key)
! 242: {
! 243: //if (!check_parity(key))
! 244: // return(-1);
! 245:
! 246: if (des_is_weak_key(key))
! 247: return(-2);
! 248: }
! 249:
1.1 root 250: return(0);
251: }
252:
253: int _cdecl des_key_sched(key, schedule)
254: des_cblock (*key);
255: des_key_schedule schedule;
256: {
257: return(des_set_key(key,schedule));
258: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.