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pineappleEA
157
externals/libressl/crypto/idea/i_skey.c
vendored
Executable file
157
externals/libressl/crypto/idea/i_skey.c
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/* $OpenBSD: i_skey.c,v 1.4 2014/10/28 07:35:58 jsg Exp $ */
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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 <openssl/crypto.h>
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#include <openssl/idea.h>
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#include "idea_lcl.h"
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static IDEA_INT inverse(unsigned int xin);
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void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks)
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{
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int i;
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IDEA_INT *kt,*kf,r0,r1,r2;
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kt= &(ks->data[0][0]);
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n2s(key,kt[0]); n2s(key,kt[1]); n2s(key,kt[2]); n2s(key,kt[3]);
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n2s(key,kt[4]); n2s(key,kt[5]); n2s(key,kt[6]); n2s(key,kt[7]);
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kf=kt;
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kt+=8;
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for (i=0; i<6; i++)
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{
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r2= kf[1];
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r1= kf[2];
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*(kt++)= ((r2<<9) | (r1>>7))&0xffff;
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r0= kf[3];
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*(kt++)= ((r1<<9) | (r0>>7))&0xffff;
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r1= kf[4];
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*(kt++)= ((r0<<9) | (r1>>7))&0xffff;
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r0= kf[5];
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*(kt++)= ((r1<<9) | (r0>>7))&0xffff;
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r1= kf[6];
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*(kt++)= ((r0<<9) | (r1>>7))&0xffff;
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r0= kf[7];
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*(kt++)= ((r1<<9) | (r0>>7))&0xffff;
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r1= kf[0];
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if (i >= 5) break;
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*(kt++)= ((r0<<9) | (r1>>7))&0xffff;
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*(kt++)= ((r1<<9) | (r2>>7))&0xffff;
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kf+=8;
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}
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}
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void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk)
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{
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int r;
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IDEA_INT *fp,*tp,t;
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tp= &(dk->data[0][0]);
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fp= &(ek->data[8][0]);
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for (r=0; r<9; r++)
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{
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*(tp++)=inverse(fp[0]);
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*(tp++)=((int)(0x10000L-fp[2])&0xffff);
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*(tp++)=((int)(0x10000L-fp[1])&0xffff);
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*(tp++)=inverse(fp[3]);
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if (r == 8) break;
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fp-=6;
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*(tp++)=fp[4];
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*(tp++)=fp[5];
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}
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tp= &(dk->data[0][0]);
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t=tp[1];
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tp[1]=tp[2];
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tp[2]=t;
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t=tp[49];
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tp[49]=tp[50];
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tp[50]=t;
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}
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/* taken directly from the 'paper' I'll have a look at it later */
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static IDEA_INT inverse(unsigned int xin)
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{
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long n1,n2,q,r,b1,b2,t;
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if (xin == 0)
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b2=0;
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else
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{
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n1=0x10001;
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n2=xin;
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b2=1;
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b1=0;
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do {
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r=(n1%n2);
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q=(n1-r)/n2;
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if (r == 0)
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{ if (b2 < 0) b2=0x10001+b2; }
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else
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{
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n1=n2;
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n2=r;
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t=b2;
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b2=b1-q*b2;
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b1=t;
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}
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} while (r != 0);
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}
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return((IDEA_INT)b2);
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}
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