62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#define DELTA 0x9e3779b9
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void xtea_encrypt(uint32_t v[2], uint32_t const key[4]) {
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uint32_t v0 = v[0], v1 = v[1], sum = 0;
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for (int i = 0; i < 32; 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;
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v[1] = v1;
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}
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void hash_file(const char *filename) {
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FILE *f = fopen(filename, "rb");
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if (!f) {
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perror("Erreur ouverture fichier");
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return;
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}
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uint8_t buffer[24];
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uint64_t final_hash[1] = {0};
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size_t bytes_read;
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while ((bytes_read = fread(buffer, 1, 24, f)) > 0) {
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if (bytes_read < 24) {
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memset(buffer + bytes_read, 24 - bytes_read, 24 - bytes_read);
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}
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uint32_t x[2];
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memcpy(x, buffer, 8);
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uint32_t key[4];
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memcpy(key, buffer + 8, 16);
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uint32_t x_orig[2] = {x[0], x[1]};
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xtea_encrypt(x, key);
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x[0] ^= x_orig[0];
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x[1] ^= x_orig[1];
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final_hash[0] ^= ((uint64_t)x[0] << 32) | x[1];
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}
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fclose(f);
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printf("Empreinte (hachage) : %016llx\n", (unsigned long long)final_hash[0]);
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}
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int main(int argc, char *argv[]) {
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if (argc != 2) {
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printf("Usage : %s <fichier>\n", argv[0]);
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return 1;
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}
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hash_file(argv[1]);
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return 0;
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} |