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144 lines
4.8 KiB
C
144 lines
4.8 KiB
C
/* crypto/des/fcrypt_b.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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/* This version of crypt has been developed from my MIT compatible
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* DES library.
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* The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
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* Eric Young (eay@cryptsoft.com)
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*/
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#define DES_FCRYPT
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#include "des_locl.h"
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#undef DES_FCRYPT
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#undef PERM_OP
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#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
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(b)^=(t),\
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(a)^=((t)<<(n)))
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#undef HPERM_OP
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#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
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(a)=(a)^(t)^(t>>(16-(n))))\
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void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
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DES_LONG Eswap1)
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{
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register DES_LONG l,r,t,u;
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#ifdef DES_PTR
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register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;
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#endif
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register DES_LONG *s;
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register int j;
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register DES_LONG E0,E1;
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l=0;
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r=0;
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s=(DES_LONG *)ks;
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E0=Eswap0;
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E1=Eswap1;
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for (j=0; j<25; j++)
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{
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#ifndef DES_UNROLL
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register int i;
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for (i=0; i<32; i+=4)
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{
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D_ENCRYPT(l,r,i+0); /* 1 */
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D_ENCRYPT(r,l,i+2); /* 2 */
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}
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#else
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D_ENCRYPT(l,r, 0); /* 1 */
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D_ENCRYPT(r,l, 2); /* 2 */
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D_ENCRYPT(l,r, 4); /* 3 */
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D_ENCRYPT(r,l, 6); /* 4 */
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D_ENCRYPT(l,r, 8); /* 5 */
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D_ENCRYPT(r,l,10); /* 6 */
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D_ENCRYPT(l,r,12); /* 7 */
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D_ENCRYPT(r,l,14); /* 8 */
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D_ENCRYPT(l,r,16); /* 9 */
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D_ENCRYPT(r,l,18); /* 10 */
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D_ENCRYPT(l,r,20); /* 11 */
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D_ENCRYPT(r,l,22); /* 12 */
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D_ENCRYPT(l,r,24); /* 13 */
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D_ENCRYPT(r,l,26); /* 14 */
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D_ENCRYPT(l,r,28); /* 15 */
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D_ENCRYPT(r,l,30); /* 16 */
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#endif
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t=l;
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l=r;
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r=t;
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}
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l=ROTATE(l,3)&0xffffffffL;
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r=ROTATE(r,3)&0xffffffffL;
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PERM_OP(l,r,t, 1,0x55555555L);
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PERM_OP(r,l,t, 8,0x00ff00ffL);
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PERM_OP(l,r,t, 2,0x33333333L);
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PERM_OP(r,l,t,16,0x0000ffffL);
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PERM_OP(l,r,t, 4,0x0f0f0f0fL);
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out[0]=r;
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out[1]=l;
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}
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