| /**************************************************************************** |
| * crypto/set_key.c |
| * $OpenBSD: set_key.c,v 1.5 2021/03/12 10:22:46 jsg Exp $ |
| * lib/des/set_key.c |
| * Copyright (C) 1995 Eric Young (eay@mincom.oz.au) |
| * All rights reserved. |
| * |
| * This file is part of an SSL implementation written |
| * by Eric Young (eay@mincom.oz.au). |
| * The implementation was written so as to conform with Netscapes SSL |
| * specification. This library and applications are |
| * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE |
| * as long as the following conditions are aheared to. |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. If this code is used in a product, |
| * Eric Young should be given attribution as the author of the parts used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by |
| * Eric Young (eay@mincom.oz.au) |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. |
| * i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] |
| * |
| * set_key.c v 1.4 eay 24/9/91 |
| * 1.4 Speed up by 400% :-) |
| * 1.3 added register declarations. |
| * 1.2 unrolled make_key_sched a bit more |
| * 1.1 added norm_expand_bits |
| * 1.0 First working version |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <strings.h> |
| |
| #include "des_locl.h" |
| #include "podd.h" |
| #include "sk.h" |
| |
| static int check_parity(FAR des_cblock *key); |
| |
| int des_check_key; |
| |
| static int check_parity(FAR des_cblock *key) |
| { |
| int i; |
| |
| for (i = 0; i < DES_KEY_SZ; i++) |
| { |
| if (*key[i] != odd_parity[*key[i]]) |
| { |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| /* Weak and semi week keys as take from |
| * %A D.W. Davies |
| * %A W.L. Price |
| * %T Security for Computer Networks |
| * %I John Wiley & Sons |
| * %D 1984 |
| * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference |
| * (and actual cblock values). |
| */ |
| |
| #define NUM_WEAK_KEY 16 |
| static des_cblock weak_keys[NUM_WEAK_KEY] = |
| { |
| /* weak keys */ |
| |
| { |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 |
| }, |
| { |
| 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe |
| }, |
| { |
| 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f |
| }, |
| { |
| 0xe0, 0xe0, 0xe0, 0xe0, 0xe0, 0xe0, 0xe0, 0xe0 |
| }, |
| |
| /* semi-weak keys */ |
| |
| { |
| 0x01, 0xfe, 0x01, 0xfe, 0x01, 0xfe, 0x01, 0xfe |
| }, |
| { |
| 0xfe, 0x01, 0xfe, 0x01, 0xfe, 0x01, 0xfe, 0x01 |
| }, |
| { |
| 0x1f, 0xe0, 0x1f, 0xe0, 0x0e, 0xf1, 0x0e, 0xf1 |
| }, |
| { |
| 0xe0, 0x1f, 0xe0, 0x1f, 0xf1, 0x0e, 0xf1, 0x0e |
| }, |
| { |
| 0x01, 0xe0, 0x01, 0xe0, 0x01, 0xf1, 0x01, 0xf1 |
| }, |
| { |
| 0xe0, 0x01, 0xe0, 0x01, 0xf1, 0x01, 0xf1, 0x01 |
| }, |
| { |
| 0x1f, 0xfe, 0x1f, 0xfe, 0x0e, 0xfe, 0x0e, 0xfe |
| }, |
| { |
| 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x0e, 0xfe, 0x0e |
| }, |
| { |
| 0x01, 0x1f, 0x01, 0x1f, 0x01, 0x0e, 0x01, 0x0e |
| }, |
| { |
| 0x1f, 0x01, 0x1f, 0x01, 0x0e, 0x01, 0x0e, 0x01 |
| }, |
| { |
| 0xe0, 0xfe, 0xe0, 0xfe, 0xf1, 0xfe, 0xf1, 0xfe |
| }, |
| { |
| 0xfe, 0xe0, 0xfe, 0xe0, 0xfe, 0xf1, 0xfe, 0xf1 |
| } |
| }; |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| int des_is_weak_key(FAR des_cblock *key) |
| { |
| int i; |
| |
| for (i = 0; i < NUM_WEAK_KEY; i++) |
| { |
| /* Added == 0 to comparison, I obviously don't run |
| * this section very often :-(, thanks to |
| * engineering@MorningStar.Com for the fix |
| * eay 93/06/29 |
| */ |
| |
| if (bcmp(weak_keys[i], key, sizeof(des_cblock)) == 0) |
| { |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* NOW DEFINED IN des_local.h |
| * See ecb_encrypt.c for a pseudo description of these macros. |
| * #define PERM_OP(a, b, t, n, m) ((t) = ((((a) >> (n))^(b)) & (m)),\ |
| * (b)^=(t),\ |
| * (a) = ((a)^((t) << (n)))) |
| */ |
| |
| #define HPERM_OP(a, t, n, m) ((t) = ((((a) << (16 - (n)))^(a)) & (m)),\ |
| (a) = (a)^(t)^(t >> (16 - (n)))) |
| |
| static int shifts2[16] = |
| { |
| 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 |
| }; |
| |
| /* return 0 if key parity is odd (correct), |
| * return -1 if key parity error, |
| * return -2 if illegal weak key. |
| */ |
| |
| int des_set_key(FAR des_cblock *key, des_key_schedule schedule) |
| { |
| register uint32_t c; |
| register uint32_t d; |
| register uint32_t t; |
| register uint32_t s; |
| FAR register unsigned char *in; |
| FAR register uint32_t *k; |
| register int i; |
| |
| if (des_check_key) |
| { |
| if (!check_parity(key)) |
| { |
| return(-1); |
| } |
| |
| if (des_is_weak_key(key)) |
| { |
| return(-2); |
| } |
| } |
| |
| k = (FAR uint32_t *)schedule; |
| in = (FAR unsigned char *)key; |
| |
| c2l(in, c); |
| c2l(in, d); |
| |
| /* do PC1 in 60 simple operations */ |
| |
| /* PERM_OP(d, c, t, 4, 0x0f0f0f0fL); |
| * HPERM_OP(c, t, -2, 0xcccc0000L); |
| * HPERM_OP(c, t, -1, 0xaaaa0000L); |
| * HPERM_OP(c, t, 8, 0x00ff0000L); |
| * HPERM_OP(c, t, -1, 0xaaaa0000L); |
| * HPERM_OP(d, t, -8, 0xff000000L); |
| * HPERM_OP(d, t, 8, 0x00ff0000L); |
| * HPERM_OP(d, t, 2, 0x33330000L); |
| * d = ((d & 0x00aa00aaL) << 7L) | |
| * ((d & 0x55005500L) >> 7L) | (d & 0xaa55aa55L); |
| * d = (d >> 8) | ((c & 0xf0000000L) >> 4); |
| * c &= 0x0fffffffL; |
| */ |
| |
| /* I now do it in 47 simple operations :-) |
| * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) |
| * for the inspiration. :-) |
| */ |
| |
| PERM_OP (d, c, t, 4, 0x0f0f0f0fl); |
| HPERM_OP(c, t, -2, 0xcccc0000l); |
| HPERM_OP(d, t, -2, 0xcccc0000l); |
| PERM_OP (d, c, t, 1, 0x55555555l); |
| PERM_OP (c, d, t, 8, 0x00ff00ffl); |
| PERM_OP (d, c, t, 1, 0x55555555l); |
| d = (((d & 0x000000ffl) << 16l) | (d & 0x0000ff00l) | |
| ((d & 0x00ff0000l) >> 16l) | ((c & 0xf0000000l) >> 4l)); |
| c &= 0x0fffffffl; |
| |
| for (i = 0; i < ITERATIONS; i++) |
| { |
| if (shifts2[i]) |
| { |
| c = ((c >> 2l) | (c << 26l)); d = ((d >> 2l) | (d << 26l)); |
| } |
| else |
| { |
| c = ((c >> 1l) | (c << 27l)); d = ((d >> 1l) | (d << 27l)); |
| } |
| |
| c &= 0x0fffffffl; |
| d &= 0x0fffffffl; |
| |
| /* could be a few less shifts but I am to lazy at this |
| * point in time to investigate |
| */ |
| |
| s = des_skb[0][(c) & 0x3f] | |
| des_skb[1][((c >> 6) & 0x03) | ((c >> 7l) & 0x3c)] | |
| des_skb[2][((c >> 13) & 0x0f) | ((c >> 14l) & 0x30)] | |
| des_skb[3][((c >> 20) & 0x01) | ((c >> 21l) & 0x06) | |
| ((c >> 22l) & 0x38)]; |
| t = des_skb[4][(d) & 0x3f] | |
| des_skb[5][((d >> 7l) & 0x03) | ((d >> 8l) & 0x3c)] | |
| des_skb[6][(d >> 15l) & 0x3f] | |
| des_skb[7][((d >> 21l) & 0x0f) | ((d >> 22l) & 0x30)]; |
| |
| /* table contained 0213 4657 */ |
| |
| *(k++) = ((t << 16l) | (s & 0x0000ffffl)) & 0xffffffffl; |
| s = ((s >> 16l) | (t & 0xffff0000l)); |
| |
| s = (s << 4l) | (s >> 28l); |
| *(k++) = s & 0xffffffffl; |
| } |
| |
| return 0; |
| } |