Security/libsecurity_apple_csp/open_ssl/misc/rc5_skey.c

   1 /*
   2  * Copyright (c) 2000-2001,2011,2014 Apple 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_skey.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 <openssl/rc5.h>
  78 #include "rc5_locl.h"
  79
  80 void RC5_32_set_key(RC5_32_KEY *key, int len, unsigned char *data,
  81              int rounds)
  82         {
  83         RC5_32_INT L[64],l,ll,A,B,*S,k;
  84         int i,j,m,c,t,ii,jj;
  85
  86         if (    (rounds != RC5_16_ROUNDS) &&
  87                 (rounds != RC5_12_ROUNDS) &&
  88                 (rounds != RC5_8_ROUNDS))
  89                 rounds=RC5_16_ROUNDS;
  90
  91         key->rounds=rounds;
  92         S= &(key->data[0]);
  93         j=0;
  94         for (i=0; i<=(len-8); i+=8)
  95                 {
  96                 c2l(data,l);
  97                 L[j++]=l;
  98                 c2l(data,l);
  99                 L[j++]=l;
 100                 }
 101         ii=len-i;
 102         if (ii)
 103                 {
 104                 k=len&0x07;
 105                 c2ln(data,l,ll,k);
 106                 L[j+0]=l;
 107                 L[j+1]=ll;
 108                 }
 109
 110         c=(len+3)/4;
 111         t=(rounds+1)*2;
 112         S[0]=RC5_32_P;
 113         for (i=1; i<t; i++)
 114                 S[i]=(S[i-1]+RC5_32_Q)&RC5_32_MASK;
 115
 116         j=(t>c)?t:c;
 117         j*=3;
 118         ii=jj=0;
 119         A=B=0;
 120         for (i=0; i<j; i++)
 121                 {
 122                 k=(S[ii]+A+B)&RC5_32_MASK;
 123                 A=S[ii]=ROTATE_l32(k,3);
 124                 m=(int)(A+B);
 125                 k=(L[jj]+A+B)&RC5_32_MASK;
 126                 B=L[jj]=ROTATE_l32(k,m);
 127                 if (++ii >= t) ii=0;
 128                 if (++jj >= c) jj=0;
 129                 }
 130         }
 131