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110 lines
4.3 KiB
110 lines
4.3 KiB
/* 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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