78 lines
1.7 KiB
C++
78 lines
1.7 KiB
C++
#include "StdAfx.h"
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#include "tea.h"
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#include <memory.h>
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#define TEA_ROUND 32
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#define DELTA 0x9E3779B9
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void tea_code(const unsigned long sz, const unsigned long sy, const unsigned long *key, unsigned long *dest)
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{
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register unsigned long y = sy, z = sz, sum = 0;
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unsigned long n = TEA_ROUND;
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while (n-- > 0)
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{
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y += ((z << 4 ^ z >> 5) + z) ^ (sum + key[sum & 3]);
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sum += DELTA;
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z += ((y << 4 ^ y >> 5) + y) ^ (sum + key[sum >> 11 & 3]);
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}
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*(dest++) = y;
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*dest = z;
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}
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void tea_decode(const unsigned long sz, const unsigned long sy, const unsigned long *key, unsigned long *dest)
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{
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#pragma warning(disable:4307)
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register unsigned long y = sy, z = sz, sum = DELTA * TEA_ROUND;
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#pragma warning(default:4307)
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unsigned long n = TEA_ROUND;
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while (n-- > 0)
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{
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z -= ((y << 4 ^ y >> 5) + y) ^ (sum + key[sum >> 11 & 3]);
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sum -= DELTA;
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y -= ((z << 4 ^ z >> 5) + z) ^ (sum + key[sum & 3]);
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}
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*(dest++) = y;
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*dest = z;
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}
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int tea_encrypt(unsigned long *dest, const unsigned long *src, const unsigned long * key, int size)
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{
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int i;
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int resize;
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if (size % 8 != 0)
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{
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resize = size + 8 - (size % 8);
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memset((char *) src + size, 0, resize - size);
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}
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else
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resize = size;
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for (i = 0; i < resize >> 3; i++, dest += 2, src += 2)
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tea_code(*(src + 1), *src, key, dest);
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return (resize);
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}
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int tea_decrypt(unsigned long *dest, const unsigned long *src, const unsigned long * key, int size)
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{
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int i;
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int resize;
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if (size % 8 != 0)
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resize = size + 8 - (size % 8);
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else
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resize = size;
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for (i = 0; i < resize >> 3; i++, dest += 2, src += 2)
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tea_decode(*(src + 1), *src, key, dest);
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return (resize);
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}
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//martysama0134's 2e58d0b8baeb072acdf3afc4a5d1999f
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