You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
171 lines
5.7 KiB
171 lines
5.7 KiB
/* crypto/idea/i_skey.c */ |
|
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
|
* All rights reserved. |
|
* |
|
* This package is an SSL implementation written |
|
* by Eric Young (eay@cryptsoft.com). |
|
* The implementation was written so as to conform with Netscapes SSL. |
|
* |
|
* This library is free for commercial and non-commercial use as long as |
|
* the following conditions are aheared to. The following conditions |
|
* apply to all code found in this distribution, be it the RC4, RSA, |
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
|
* included with this distribution is covered by the same copyright terms |
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
|
* |
|
* Copyright remains Eric Young's, and as such any Copyright notices in |
|
* the code are not to be removed. |
|
* If this package is used in a product, Eric Young should be given attribution |
|
* as the author of the parts of the library used. |
|
* This can be in the form of a textual message at program startup or |
|
* in documentation (online or textual) provided with the package. |
|
* |
|
* Redistribution and use in source and binary forms, with or without |
|
* modification, are permitted provided that the following conditions |
|
* are met: |
|
* 1. Redistributions of source code must retain the copyright |
|
* notice, this list of conditions and the following disclaimer. |
|
* 2. Redistributions in binary form must reproduce the above copyright |
|
* notice, this list of conditions and the following disclaimer in the |
|
* documentation and/or other materials provided with the distribution. |
|
* 3. All advertising materials mentioning features or use of this software |
|
* must display the following acknowledgement: |
|
* "This product includes cryptographic software written by |
|
* Eric Young (eay@cryptsoft.com)" |
|
* The word 'cryptographic' can be left out if the rouines from the library |
|
* being used are not cryptographic related :-). |
|
* 4. If you include any Windows specific code (or a derivative thereof) from |
|
* the apps directory (application code) you must include an acknowledgement: |
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
|
* |
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
|
* SUCH DAMAGE. |
|
* |
|
* The licence and distribution terms for any publically available version or |
|
* derivative of this code cannot be changed. i.e. this code cannot simply be |
|
* copied and put under another distribution licence |
|
* [including the GNU Public Licence.] |
|
*/ |
|
|
|
#include <openssl/crypto.h> |
|
#include <openssl/idea.h> |
|
#include "idea_lcl.h" |
|
|
|
static IDEA_INT inverse(unsigned int xin); |
|
void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) |
|
#ifdef OPENSSL_FIPS |
|
{ |
|
fips_cipher_abort(IDEA); |
|
private_idea_set_encrypt_key(key, ks); |
|
} |
|
|
|
void private_idea_set_encrypt_key(const unsigned char *key, |
|
IDEA_KEY_SCHEDULE *ks) |
|
#endif |
|
{ |
|
int i; |
|
register IDEA_INT *kt, *kf, r0, r1, r2; |
|
|
|
kt = &(ks->data[0][0]); |
|
n2s(key, kt[0]); |
|
n2s(key, kt[1]); |
|
n2s(key, kt[2]); |
|
n2s(key, kt[3]); |
|
n2s(key, kt[4]); |
|
n2s(key, kt[5]); |
|
n2s(key, kt[6]); |
|
n2s(key, kt[7]); |
|
|
|
kf = kt; |
|
kt += 8; |
|
for (i = 0; i < 6; i++) { |
|
r2 = kf[1]; |
|
r1 = kf[2]; |
|
*(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff; |
|
r0 = kf[3]; |
|
*(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; |
|
r1 = kf[4]; |
|
*(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; |
|
r0 = kf[5]; |
|
*(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; |
|
r1 = kf[6]; |
|
*(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; |
|
r0 = kf[7]; |
|
*(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; |
|
r1 = kf[0]; |
|
if (i >= 5) |
|
break; |
|
*(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; |
|
*(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff; |
|
kf += 8; |
|
} |
|
} |
|
|
|
void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk) |
|
{ |
|
int r; |
|
register IDEA_INT *fp, *tp, t; |
|
|
|
tp = &(dk->data[0][0]); |
|
fp = &(ek->data[8][0]); |
|
for (r = 0; r < 9; r++) { |
|
*(tp++) = inverse(fp[0]); |
|
*(tp++) = ((int)(0x10000L - fp[2]) & 0xffff); |
|
*(tp++) = ((int)(0x10000L - fp[1]) & 0xffff); |
|
*(tp++) = inverse(fp[3]); |
|
if (r == 8) |
|
break; |
|
fp -= 6; |
|
*(tp++) = fp[4]; |
|
*(tp++) = fp[5]; |
|
} |
|
|
|
tp = &(dk->data[0][0]); |
|
t = tp[1]; |
|
tp[1] = tp[2]; |
|
tp[2] = t; |
|
|
|
t = tp[49]; |
|
tp[49] = tp[50]; |
|
tp[50] = t; |
|
} |
|
|
|
/* taken directly from the 'paper' I'll have a look at it later */ |
|
static IDEA_INT inverse(unsigned int xin) |
|
{ |
|
long n1, n2, q, r, b1, b2, t; |
|
|
|
if (xin == 0) |
|
b2 = 0; |
|
else { |
|
n1 = 0x10001; |
|
n2 = xin; |
|
b2 = 1; |
|
b1 = 0; |
|
|
|
do { |
|
r = (n1 % n2); |
|
q = (n1 - r) / n2; |
|
if (r == 0) { |
|
if (b2 < 0) |
|
b2 = 0x10001 + b2; |
|
} else { |
|
n1 = n2; |
|
n2 = r; |
|
t = b2; |
|
b2 = b1 - q * b2; |
|
b1 = t; |
|
} |
|
} while (r != 0); |
|
} |
|
return ((IDEA_INT) b2); |
|
}
|
|
|