mirror of
https://github.com/openssl/openssl.git
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0f113f3ee4
Reviewed-by: Tim Hudson <tjh@openssl.org>
162 lines
5.5 KiB
C
162 lines
5.5 KiB
C
/* crypto/idea/i_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 <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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register IDEA_INT *kt, *kf, r0, r1, r2;
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kt = &(ks->data[0][0]);
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n2s(key, kt[0]);
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n2s(key, kt[1]);
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n2s(key, kt[2]);
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n2s(key, kt[3]);
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n2s(key, kt[4]);
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n2s(key, kt[5]);
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n2s(key, kt[6]);
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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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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)
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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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register 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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*(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)
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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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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)
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b2 = 0x10001 + b2;
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} else {
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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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