116 lines
4 KiB
C
116 lines
4 KiB
C
/* crypto/rc5/rc5_skey.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 "rc5.h"
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#include "rc5_locl.h"
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void RC5_32_set_key(key,len,data,rounds)
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RC5_32_KEY *key;
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int len;
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unsigned char *data;
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int rounds;
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{
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RC5_32_INT L[64],l,ll,A,B,*S,k;
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int i,j,m,c,t,ii,jj;
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if ( (rounds != RC5_16_ROUNDS) &&
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(rounds != RC5_12_ROUNDS) &&
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(rounds != RC5_8_ROUNDS))
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rounds=RC5_16_ROUNDS;
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key->rounds=rounds;
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S= &(key->data[0]);
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j=0;
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for (i=0; i<=(len-8); i+=8)
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{
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c2l(data,l);
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L[j++]=l;
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c2l(data,l);
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L[j++]=l;
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}
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ii=len-i;
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if (ii)
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{
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k=len&0x07;
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c2ln(data,l,ll,k);
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L[j+0]=l;
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L[j+1]=ll;
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}
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c=(len+3)/4;
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t=(rounds+1)*2;
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S[0]=RC5_32_P;
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for (i=1; i<t; i++)
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S[i]=(S[i-1]+RC5_32_Q)&RC5_32_MASK;
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j=(t>c)?t:c;
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j*=3;
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ii=jj=0;
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A=B=0;
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for (i=0; i<j; i++)
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{
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k=(S[ii]+A+B)&RC5_32_MASK;
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A=S[ii]=ROTATE_l32(k,3);
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m=(int)(A+B);
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k=(L[jj]+A+B)&RC5_32_MASK;
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B=L[jj]=ROTATE_l32(k,m);
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if (++ii >= t) ii=0;
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if (++jj >= c) jj=0;
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}
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}
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