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/* crypto/rc5/rc5_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/rc5.h>
#include "rc5_locl.h"
void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,
int rounds)
{
RC5_32_INT L[64], l, ll, A, B, *S, k;
int i, j, m, c, t, ii, jj;
if ((rounds != RC5_16_ROUNDS) &&
(rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS))
rounds = RC5_16_ROUNDS;
key->rounds = rounds;
S = &(key->data[0]);
j = 0;
for (i = 0; i <= (len - 8); i += 8) {
c2l(data, l);
L[j++] = l;
c2l(data, l);
L[j++] = l;
}
ii = len - i;
if (ii) {
k = len & 0x07;
c2ln(data, l, ll, k);
L[j + 0] = l;
L[j + 1] = ll;
}
c = (len + 3) / 4;
t = (rounds + 1) * 2;
S[0] = RC5_32_P;
for (i = 1; i < t; i++)
S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK;
j = (t > c) ? t : c;
j *= 3;
ii = jj = 0;
A = B = 0;
for (i = 0; i < j; i++) {
k = (S[ii] + A + B) & RC5_32_MASK;
A = S[ii] = ROTATE_l32(k, 3);
m = (int)(A + B);
k = (L[jj] + A + B) & RC5_32_MASK;
B = L[jj] = ROTATE_l32(k, m);
if (++ii >= t)
ii = 0;
if (++jj >= c)
jj = 0;
}
}
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