Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/des/fcrypt_b.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This package is an SSL implementation written |
| 6 | * by Eric Young (eay@cryptsoft.com). |
| 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 (tjh@cryptsoft.com). |
| 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 (eay@cryptsoft.com)" |
| 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 (tjh@cryptsoft.com)" |
| 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 | #include <stdio.h> |
| 60 | |
| 61 | /* This version of crypt has been developed from my MIT compatible |
| 62 | * DES library. |
| 63 | * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au |
| 64 | * Eric Young (eay@cryptsoft.com) |
| 65 | */ |
| 66 | |
| 67 | #define DES_FCRYPT |
| 68 | #include "des_locl.h" |
| 69 | #undef DES_FCRYPT |
| 70 | |
| 71 | #undef PERM_OP |
| 72 | #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ |
| 73 | (b)^=(t),\ |
| 74 | (a)^=((t)<<(n))) |
| 75 | |
| 76 | #undef HPERM_OP |
| 77 | #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ |
| 78 | (a)=(a)^(t)^(t>>(16-(n))))\ |
| 79 | |
| 80 | void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0, |
| 81 | DES_LONG Eswap1) |
| 82 | { |
| 83 | register DES_LONG l,r,t,u; |
| 84 | #ifdef DES_PTR |
| 85 | register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans; |
| 86 | #endif |
| 87 | register DES_LONG *s; |
| 88 | register int j; |
| 89 | register DES_LONG E0,E1; |
| 90 | |
| 91 | l=0; |
| 92 | r=0; |
| 93 | |
| 94 | s=(DES_LONG *)ks; |
| 95 | E0=Eswap0; |
| 96 | E1=Eswap1; |
| 97 | |
| 98 | for (j=0; j<25; j++) |
| 99 | { |
| 100 | #ifndef DES_UNROLL |
| 101 | register int i; |
| 102 | |
| 103 | for (i=0; i<32; i+=4) |
| 104 | { |
| 105 | D_ENCRYPT(l,r,i+0); /* 1 */ |
| 106 | D_ENCRYPT(r,l,i+2); /* 2 */ |
| 107 | } |
| 108 | #else |
| 109 | D_ENCRYPT(l,r, 0); /* 1 */ |
| 110 | D_ENCRYPT(r,l, 2); /* 2 */ |
| 111 | D_ENCRYPT(l,r, 4); /* 3 */ |
| 112 | D_ENCRYPT(r,l, 6); /* 4 */ |
| 113 | D_ENCRYPT(l,r, 8); /* 5 */ |
| 114 | D_ENCRYPT(r,l,10); /* 6 */ |
| 115 | D_ENCRYPT(l,r,12); /* 7 */ |
| 116 | D_ENCRYPT(r,l,14); /* 8 */ |
| 117 | D_ENCRYPT(l,r,16); /* 9 */ |
| 118 | D_ENCRYPT(r,l,18); /* 10 */ |
| 119 | D_ENCRYPT(l,r,20); /* 11 */ |
| 120 | D_ENCRYPT(r,l,22); /* 12 */ |
| 121 | D_ENCRYPT(l,r,24); /* 13 */ |
| 122 | D_ENCRYPT(r,l,26); /* 14 */ |
| 123 | D_ENCRYPT(l,r,28); /* 15 */ |
| 124 | D_ENCRYPT(r,l,30); /* 16 */ |
| 125 | #endif |
| 126 | |
| 127 | t=l; |
| 128 | l=r; |
| 129 | r=t; |
| 130 | } |
| 131 | l=ROTATE(l,3)&0xffffffffL; |
| 132 | r=ROTATE(r,3)&0xffffffffL; |
| 133 | |
| 134 | PERM_OP(l,r,t, 1,0x55555555L); |
| 135 | PERM_OP(r,l,t, 8,0x00ff00ffL); |
| 136 | PERM_OP(l,r,t, 2,0x33333333L); |
| 137 | PERM_OP(r,l,t,16,0x0000ffffL); |
| 138 | PERM_OP(l,r,t, 4,0x0f0f0f0fL); |
| 139 | |
| 140 | out[0]=r; |
| 141 | out[1]=l; |
| 142 | } |
| 143 | |