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55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/***********************************************************************
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Copyright 2006-2007 Ma Bingyao
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These sources is free software. Redistributions of source code must
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retain the above copyright notice. Redistributions in binary form
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must reproduce the above copyright notice. You can redistribute it
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freely. You can use it with any free or commercial software.
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These sources is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY. Without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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You may contact the author by:
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e-mail: andot@coolcode.cn
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*************************************************************************/
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#include "xxtea.h"
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void xxtea_long_encrypt(xxtea_long *v, xxtea_long len, xxtea_long *k) {
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xxtea_long n = len - 1;
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xxtea_long z = v[n], y = v[0], p, q = 6 + 52 / (n + 1), sum = 0, e;
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if (n < 1) {
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return;
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}
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while (0 < q--) {
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sum += XXTEA_DELTA;
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e = sum >> 2 & 3;
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for (p = 0; p < n; p++) {
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y = v[p + 1];
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z = v[p] += XXTEA_MX;
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}
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y = v[0];
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z = v[n] += XXTEA_MX;
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}
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}
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void xxtea_long_decrypt(xxtea_long *v, xxtea_long len, xxtea_long *k) {
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xxtea_long n = len - 1;
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xxtea_long z = v[n], y = v[0], p, q = 6 + 52 / (n + 1), sum = q * XXTEA_DELTA, e;
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if (n < 1) {
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return;
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}
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while (sum != 0) {
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e = sum >> 2 & 3;
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for (p = n; p > 0; p--) {
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z = v[p - 1];
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y = v[p] -= XXTEA_MX;
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}
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z = v[n];
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y = v[0] -= XXTEA_MX;
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sum -= XXTEA_DELTA;
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}
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}
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