35 lines
1001 B
C
35 lines
1001 B
C
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#include "xtea.h"
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#include<string.h>
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#define TOUR 32
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void encrypt_xtea(uint32_t v[2], uint32_t const key[4]) {
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unsigned int i;
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uint32_t v0=v[0], v1=v[1], sum=0, delta=0x9E3779B9;
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for (i=0; i < TOUR; i++) {
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v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + key[sum & 3]);
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sum += delta;
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v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + key[(sum>>11) & 3]);
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}
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v[0]=v0; v[1]=v1;
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}
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void decrypt_xtea(uint32_t v[2], uint32_t const key[4]) {
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unsigned int i;
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uint32_t v0=v[0], v1=v[1], delta=0x9E3779B9, sum=delta*TOUR;
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for (i=0; i < TOUR; i++) {
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v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + key[(sum>>11) & 3]);
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sum -= delta;
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v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + key[sum & 3]);
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}
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v[0]=v0; v[1]=v1;
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}
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uint64_t hash_block_xtea(char b[24])
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{
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uint32_t v[2];
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uint32_t k[4];
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memcpy(v,b,2*sizeof(uint32_t));
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memcpy(k,b+2*sizeof(uint32_t),4*sizeof(uint32_t));
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encrypt_xtea(v,k);
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return ((uint64_t)v[0])<<32 | v[1];
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}
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