fcrypt_b.c
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- /* crypto/des/fcrypt_b.c */
- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library 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 cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * 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.]
- */
- #include <stdio.h>
- /* This version of crypt has been developed from my MIT compatible
- * DES library.
- * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
- * Eric Young (eay@cryptsoft.com)
- */
- #define DES_FCRYPT
- #include "des_locl.h"
- #undef DES_FCRYPT
- #undef PERM_OP
- #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),
- (b)^=(t),
- (a)^=((t)<<(n)))
- #undef HPERM_OP
- #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),
- (a)=(a)^(t)^(t>>(16-(n))))
- void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
- DES_LONG Eswap1)
- {
- register DES_LONG l,r,t,u;
- #ifdef DES_PTR
- register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;
- #endif
- register DES_LONG *s;
- register int j;
- register DES_LONG E0,E1;
- l=0;
- r=0;
- s=(DES_LONG *)ks;
- E0=Eswap0;
- E1=Eswap1;
- for (j=0; j<25; j++)
- {
- #ifndef DES_UNROLL
- register int i;
- for (i=0; i<32; i+=8)
- {
- D_ENCRYPT(l,r,i+0); /* 1 */
- D_ENCRYPT(r,l,i+2); /* 2 */
- D_ENCRYPT(l,r,i+4); /* 1 */
- D_ENCRYPT(r,l,i+6); /* 2 */
- }
- #else
- D_ENCRYPT(l,r, 0); /* 1 */
- D_ENCRYPT(r,l, 2); /* 2 */
- D_ENCRYPT(l,r, 4); /* 3 */
- D_ENCRYPT(r,l, 6); /* 4 */
- D_ENCRYPT(l,r, 8); /* 5 */
- D_ENCRYPT(r,l,10); /* 6 */
- D_ENCRYPT(l,r,12); /* 7 */
- D_ENCRYPT(r,l,14); /* 8 */
- D_ENCRYPT(l,r,16); /* 9 */
- D_ENCRYPT(r,l,18); /* 10 */
- D_ENCRYPT(l,r,20); /* 11 */
- D_ENCRYPT(r,l,22); /* 12 */
- D_ENCRYPT(l,r,24); /* 13 */
- D_ENCRYPT(r,l,26); /* 14 */
- D_ENCRYPT(l,r,28); /* 15 */
- D_ENCRYPT(r,l,30); /* 16 */
- #endif
- t=l;
- l=r;
- r=t;
- }
- l=ROTATE(l,3)&0xffffffffL;
- r=ROTATE(r,3)&0xffffffffL;
- PERM_OP(l,r,t, 1,0x55555555L);
- PERM_OP(r,l,t, 8,0x00ff00ffL);
- PERM_OP(l,r,t, 2,0x33333333L);
- PERM_OP(r,l,t,16,0x0000ffffL);
- PERM_OP(l,r,t, 4,0x0f0f0f0fL);
- out[0]=r;
- out[1]=l;
- }