libsecurity_apple_csp/open_ssl/misc/rc5_enc.c

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /* crypto/rc5/rc5_enc.c */
  20 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  21  * All rights reserved.
  22  *
  23  * This package is an SSL implementation written
  24  * by Eric Young (eay@cryptsoft.com).
  25  * The implementation was written so as to conform with Netscapes SSL.
  26  *
  27  * This library is free for commercial and non-commercial use as long as
  28  * the following conditions are aheared to.  The following conditions
  29  * apply to all code found in this distribution, be it the RC4, RSA,
  30  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  31  * included with this distribution is covered by the same copyright terms
  32  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  33  *
  34  * Copyright remains Eric Young's, and as such any Copyright notices in
  35  * the code are not to be removed.
  36  * If this package is used in a product, Eric Young should be given attribution
  37  * as the author of the parts of the library used.
  38  * This can be in the form of a textual message at program startup or
  39  * in documentation (online or textual) provided with the package.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. All advertising materials mentioning features or use of this software
  50  *    must display the following acknowledgement:
  51  *    "This product includes cryptographic software written by
  52  *     Eric Young (eay@cryptsoft.com)"
  53  *    The word 'cryptographic' can be left out if the rouines from the library
  54  *    being used are not cryptographic related :-).
  55  * 4. If you include any Windows specific code (or a derivative thereof) from
  56  *    the apps directory (application code) you must include an acknowledgement:
  57  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  58  *
  59  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  69  * SUCH DAMAGE.
  70  *
  71  * The licence and distribution terms for any publically available version or
  72  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  73  * copied and put under another distribution licence
  74  * [including the GNU Public Licence.]
  75  */
  76
  77 #include <stdio.h>
  78 #include <openssl/rc5.h>
  79 #include "rc5_locl.h"
  80
  81 #ifndef _OPENSSL_APPLE_CDSA_
  82 void RC5_32_cbc_encrypt(unsigned char *in, unsigned char *out, long length,
  83              RC5_32_KEY *ks, unsigned char *iv, int encrypt)
  84         {
  85         register unsigned long tin0,tin1;
  86         register unsigned long tout0,tout1,xor0,xor1;
  87         register long l=length;
  88         unsigned long tin[2];
  89
  90         if (encrypt)
  91                 {
  92                 c2l(iv,tout0);
  93                 c2l(iv,tout1);
  94                 iv-=8;
  95                 for (l-=8; l>=0; l-=8)
  96                         {
  97                         c2l(in,tin0);
  98                         c2l(in,tin1);
  99                         tin0^=tout0;
 100                         tin1^=tout1;
 101                         tin[0]=tin0;
 102                         tin[1]=tin1;
 103                         RC5_32_encrypt(tin,ks);
 104                         tout0=tin[0]; l2c(tout0,out);
 105                         tout1=tin[1]; l2c(tout1,out);
 106                         }
 107                 if (l != -8)
 108                         {
 109                         c2ln(in,tin0,tin1,l+8);
 110                         tin0^=tout0;
 111                         tin1^=tout1;
 112                         tin[0]=tin0;
 113                         tin[1]=tin1;
 114                         RC5_32_encrypt(tin,ks);
 115                         tout0=tin[0]; l2c(tout0,out);
 116                         tout1=tin[1]; l2c(tout1,out);
 117                         }
 118                 l2c(tout0,iv);
 119                 l2c(tout1,iv);
 120                 }
 121         else
 122                 {
 123                 c2l(iv,xor0);
 124                 c2l(iv,xor1);
 125                 iv-=8;
 126                 for (l-=8; l>=0; l-=8)
 127                         {
 128                         c2l(in,tin0); tin[0]=tin0;
 129                         c2l(in,tin1); tin[1]=tin1;
 130                         RC5_32_decrypt(tin,ks);
 131                         tout0=tin[0]^xor0;
 132                         tout1=tin[1]^xor1;
 133                         l2c(tout0,out);
 134                         l2c(tout1,out);
 135                         xor0=tin0;
 136                         xor1=tin1;
 137                         }
 138                 if (l != -8)
 139                         {
 140                         c2l(in,tin0); tin[0]=tin0;
 141                         c2l(in,tin1); tin[1]=tin1;
 142                         RC5_32_decrypt(tin,ks);
 143                         tout0=tin[0]^xor0;
 144                         tout1=tin[1]^xor1;
 145                         l2cn(tout0,tout1,out,l+8);
 146                         xor0=tin0;
 147                         xor1=tin1;
 148                         }
 149                 l2c(xor0,iv);
 150                 l2c(xor1,iv);
 151                 }
 152         tin0=tin1=tout0=tout1=xor0=xor1=0;
 153         tin[0]=tin[1]=0;
 154         }
 155
 156 #endif
 157
 158 #ifdef  _OPENSSL_APPLE_CDSA_
 159 void RC5_32_encrypt(RC5_32_INT *d, RC5_32_KEY *key)
 160 #else
 161 void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key)
 162 #endif  /* _OPENSSL_APPLE_CDSA_ */
 163         {
 164         RC5_32_INT a,b,*s;
 165
 166         s=key->data;
 167
 168         a=d[0]+s[0];
 169         b=d[1]+s[1];
 170         E_RC5_32(a,b,s, 2);
 171         E_RC5_32(a,b,s, 4);
 172         E_RC5_32(a,b,s, 6);
 173         E_RC5_32(a,b,s, 8);
 174         E_RC5_32(a,b,s,10);
 175         E_RC5_32(a,b,s,12);
 176         E_RC5_32(a,b,s,14);
 177         E_RC5_32(a,b,s,16);
 178         if (key->rounds == 12)
 179                 {
 180                 E_RC5_32(a,b,s,18);
 181                 E_RC5_32(a,b,s,20);
 182                 E_RC5_32(a,b,s,22);
 183                 E_RC5_32(a,b,s,24);
 184                 }
 185         else if (key->rounds == 16)
 186                 {
 187                 /* Do a full expansion to avoid a jump */
 188                 E_RC5_32(a,b,s,18);
 189                 E_RC5_32(a,b,s,20);
 190                 E_RC5_32(a,b,s,22);
 191                 E_RC5_32(a,b,s,24);
 192                 E_RC5_32(a,b,s,26);
 193                 E_RC5_32(a,b,s,28);
 194                 E_RC5_32(a,b,s,30);
 195                 E_RC5_32(a,b,s,32);
 196                 }
 197         d[0]=a;
 198         d[1]=b;
 199         }
 200
 201 #ifdef  _OPENSSL_APPLE_CDSA_
 202 void RC5_32_decrypt(RC5_32_INT *d, RC5_32_KEY *key)
 203 #else
 204 void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key)
 205 #endif  /* _OPENSSL_APPLE_CDSA_*/
 206         {
 207         RC5_32_INT a,b,*s;
 208
 209         s=key->data;
 210
 211         a=d[0];
 212         b=d[1];
 213         if (key->rounds == 16)
 214                 {
 215                 D_RC5_32(a,b,s,32);
 216                 D_RC5_32(a,b,s,30);
 217                 D_RC5_32(a,b,s,28);
 218                 D_RC5_32(a,b,s,26);
 219                 /* Do a full expansion to avoid a jump */
 220                 D_RC5_32(a,b,s,24);
 221                 D_RC5_32(a,b,s,22);
 222                 D_RC5_32(a,b,s,20);
 223                 D_RC5_32(a,b,s,18);
 224                 }
 225         else if (key->rounds == 12)
 226                 {
 227                 D_RC5_32(a,b,s,24);
 228                 D_RC5_32(a,b,s,22);
 229                 D_RC5_32(a,b,s,20);
 230                 D_RC5_32(a,b,s,18);
 231                 }
 232         D_RC5_32(a,b,s,16);
 233         D_RC5_32(a,b,s,14);
 234         D_RC5_32(a,b,s,12);
 235         D_RC5_32(a,b,s,10);
 236         D_RC5_32(a,b,s, 8);
 237         D_RC5_32(a,b,s, 6);
 238         D_RC5_32(a,b,s, 4);
 239         D_RC5_32(a,b,s, 2);
 240         d[0]=a-s[0];
 241         d[1]=b-s[1];
 242         }
 243