Onetimebluh (Workbluhp in blogress!!)
======================================

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
-------

Still usign just gcc. Compile only for testing. Openssl libraries are needed and must be linked to gcc with the option `-lcrypto`. Here follows an example:

```
gcc -Wall -Wpedantic -lcrypto onetimebluh.c -o otbluh -v
```

Usage
-------

Example creates two keys of length 4096 bytes and use the first as a message and the second as the pad key (just for testing):

```
otbluh --key-gen --nbytes 4096 --output message
otbluh --key-gen --nbytes 4096 --output pad
otbluh --encrypt message --key-file pad --output encrypted-message
otbluh --decrypt encrypted-message --key-file pad --outptut decrypted-message
```

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 message --key-file pad --output encrypted-message --tear-page
```

Or using the short options:

```
otbluh -te 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 message --output bluhed-message
```

You can print the help by running `onetimebluh --help` or `onetimebluh -h`.

```
ONETIMEBLUH USAGE:
otbluh [COMMAND] [OPTIONS]

COMMANDS:
-b, --bluh              bluhes your message or in other words performs a bynary dump
-d, --decrypt=FILE      decrypt message (input) same ad --encrypt, just for the feeling
-e, --encrypt=FILE      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
-k, --key-file=KEY_FILE use key (input)
-n, --nbytes=NUM        number of bytes
-o, --output=FILE       output name
-t, --tear-page         deletes from the pad file the bytes used to encrypt/decrypt

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