40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
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#include "tea.h"
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#include<string.h>
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#define TOUR 32
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void encrypt_tea (uint32_t * v, uint32_t* k)
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{
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uint32_t v0=v[0], v1=v[1], sum=0, i; /* initialisation */
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uint32_t delta=0x9e3779b9; /* constantes de clef */
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uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; /* mise en cache de la clef */
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for (i=0; i < TOUR; i++) { /* boucle principale */
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sum += delta;
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v0 += ((v1<<4) + k0) ^ (v1 + sum) ^ ((v1>>5) + k1);
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v1 += ((v0<<4) + k2) ^ (v0 + sum) ^ ((v0>>5) + k3);
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}
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v[0]=v0; v[1]=v1;
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}
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void decrypt_tea (uint32_t* v, uint32_t* k)
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{
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uint32_t v0=v[0], v1=v[1], sum=0xC6EF3720, i; /* initialisation */
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uint32_t delta=0x9e3779b9; /* constantes de clefs */
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uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; /* mise en cache de la clef */
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for (i=0; i<TOUR; i++) { /* boucle principale */
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v1 -= ((v0<<4) + k2) ^ (v0 + sum) ^ ((v0>>5) + k3);
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v0 -= ((v1<<4) + k0) ^ (v1 + sum) ^ ((v1>>5) + k1);
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sum -= delta;
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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_tea(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_tea(v,k);
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return ((uint64_t)v[0])<<32 | v[1];
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}
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