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62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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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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