39 lines
1.0 KiB
C
39 lines
1.0 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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void encrypt(uint16_t *v, uint16_t *k) {
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uint16_t v0 = v[0], v1 = v[1], sum = 0, i; /* set up */
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//uint32_t delta = 0x9e3779b9; /* a key schedule constant */
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uint16_t delta= 0x9e37;
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uint16_t k0 = k[0], k1 = k[1], k2 = k[2], k3 = k[3]; /* cache key */
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for (i = 0; i < 64; i++) { /* basic cycle start */
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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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} /* end cycle */
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v[0] = v0;
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v[1] = v1;
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}
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int main(int argc, char *argv[]) {
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uint8_t *buf;
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uint32_t buflen, i;
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if (argc != 3) {
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printf("Usage: %s text_to_encrypt key", argv[0]);
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exit(1);
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}
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buflen = strlen(argv[1]);
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buf = (uint8_t *)malloc(buflen);
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memcpy(buf, argv[1], buflen);
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encrypt((uint16_t *)buf, (uint16_t *)argv[2]);
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printf("Result:\n");
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for (i = 0; i < buflen; i++) {
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printf("%02x", buf[i]);
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}
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printf("\n");
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return 0;
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} |