111 lines
4.3 KiB
C
111 lines
4.3 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 <openssl/rc5.h>
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#include "rc5_locl.h"
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void RC5_32_set_key(RC5_32_KEY *key, int len, const 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) && (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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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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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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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)
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ii = 0;
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if (++jj >= c)
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jj = 0;
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}
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}
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