#include #include #include #include #include void encrypt(uint32_t *v, uint32_t *k) { uint32_t v0 = v[0], v1 = v[1], sum = 0, i; /* set up */ //uint32_t delta = 0x9e3779b9; /* a key schedule constant */ uint16_t delta= 0x9e37; uint32_t k0 = k[0], k1 = k[1], k2 = k[2], k3 = k[3]; /* cache key */ for (i = 0; i < 32; i++) { /* basic cycle start */ sum += delta; v0 += ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1); v1 += ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3); } /* end cycle */ v[0] = v0; v[1] = v1; } int main(int argc, char *argv[]) { uint8_t *buf; uint32_t buflen, i; if (argc != 3) { printf("Usage: %s text_to_encrypt key", argv[0]); exit(1); } buflen = strlen(argv[1]); buf = (uint8_t *)malloc(buflen); memcpy(buf, argv[1], buflen); encrypt((uint32_t *)buf, (uint32_t *)argv[2]); printf("Result:\n"); for (i = 0; i < buflen; i++) { printf("%02x", buf[i]); } printf("\n"); return 0; }