mirror of https://github.com/dirtbags/moth.git
50 lines
920 B
C
50 lines
920 B
C
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <sysexits.h>
|
|
#include "arc4.h"
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct arc4_ctx ctx;
|
|
|
|
/* Read key and initialize context */
|
|
{
|
|
uint8_t key[256];
|
|
size_t keylen = 0;
|
|
FILE *f;
|
|
|
|
if (argc == 2) {
|
|
if (! (f = fopen(argv[1], "r"))) {
|
|
perror(argv[0]);
|
|
}
|
|
} else {
|
|
f = fdopen(3, "r");
|
|
}
|
|
|
|
if (f) {
|
|
keylen = fread(key, 1, sizeof(key), f);
|
|
fclose(f);
|
|
}
|
|
|
|
if (0 == keylen) {
|
|
fprintf(stderr, "Usage: %s [KEYFILE] <PLAINTEXT\n", argv[0]);
|
|
fprintf(stderr, "\n");
|
|
fprintf(stderr, "You can also pass in the key on fd 3; omit\n");
|
|
fprintf(stderr, "KEYFILE in this case.\n");
|
|
return EX_IOERR;
|
|
}
|
|
arc4_init(&ctx, key, (size_t)keylen);
|
|
}
|
|
|
|
/* Encrypt */
|
|
while (1) {
|
|
int c = getchar();
|
|
|
|
if (EOF == c) break;
|
|
putchar(c ^ arc4_pad(&ctx));
|
|
}
|
|
|
|
return 0;
|
|
}
|