# Onetimebluh

Simple implementation of One Time Pad cipher. 
Capable of generating cryptographically strong random number keys and of usign them to encrypt/decrypt messages of same length with a bitwise XOR function.

## Build

To build onetimebluh just run `make` and you will find the executable binary in the build folder.

## Install

If you want to install onetimebluh, just run `make install`.
If you are using Archlinux onetimebluh is available in the [AUR](https://aur.archlinux.org/packages/otbluh/) and in my unofficial Archlinux repository [seppianet](https://archlinux.seppia.net/).

To use the repo simply add the following to you `pacman.conf` (currently the repo has only `x86_64` packages):

```
[seppianet]
SigLevel = Optional
Server = https://archlinux.seppia.net/$arch
```

If you want to ahve alvways the latest version there is also the git package in the [AUR](https://aur.archlinux.org/packages/otbluh-git/)

## Usage

This example creates a `message` file of 4 KiB and a key of the same length (we are encrypting a pseudo random bytes file):

```
dd bs=512 count=8 if=/dev/urandom of=message
otbluh --gen-key --nbytes 4K --output pad
otbluh --encrypt --input message --key-file pad --output encrypted-message
otbluh --decrypt --input encrypted-message --key-file pad --outptut decrypted-message
```

It is recommended to use the `-t` option in order to be sure not to use more than once the same pieces of the pad to encrypt your data. Here follows an other example:

```
otbluh --encrypt --input message --key-file pad --output encrypted-message --tear-page
```

Or using the short options:

```
otbluh -tei message -k pad -o encrypted-message
```

If you want you can use the `--bluh` function to get the binary dump of yuor encrypted message:
```
otbluh --bluh --input message --output bluhed-message
```

You can print the help by running `otbluh --help`.

```
Onetimebluh usage:
otbluh [COMMAND] [OPTIONS]

Commands:

 -b, --bluh                 bluhes your message or in other words performs a binary dump
 -d, --decrypt              decrypt message (input) same ad --encrypt, just for the feeling
 -e, --encrypt              encrypt message (input)
 -g, --gen-key              create key file
 -h, --help                 print this help
 -u, --unbluh               unbluhes your message (gets the orginal message from the binary dump)

Options:

 -c, --char=CAHRS           reads two cahracters as argument and uses them to bluh your message
 -k, --key-file=KEY_FILE    use key (input)
 -i, --input=FILE           input file
 -n, --nbytes=NUM{K,M,G,T}  number of bytes, you can specify K for KiB, M for MiB, etc... 
 -o, --output=FILE          output file
 -q, --quiet                suppresses all messages, except from error releated ones
 -t, --tear-page            deletes from the pad file the bytes used to encrypt/decrypt

Onetimebluh project repository at https://git.eigenlab.org/seppia/onetimebluh
```