// gcc -o otp_rand otp_rand.c -Wall -std=c99
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main( int argc, char *argv[] )
{
    if( argc != 2 )
    {
        printf("Usage: %s plaintext\n", argv[0] );
        return 1;
    }

    unsigned int seed = time( NULL );
    srand( seed );
    printf( "Seed: %u\n", seed );
    printf( "Ciphertext: " );
    for( int i = 0; argv[1][i] != '\0'; i++ )
        printf( "%02x", argv[1][i] ^ ( rand() & 0xff ) );
    printf( "\n" );

    return 0;
}