---
name: "vt_otp"
section: "3tcl"
platform: "linux"
package: "tcllib"
version: "2.0+dfsg-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/vt_otp"
---

# vt\_otp(3tcl)

Encryption via one-time pad

```

```

## NAME

tcl::transform::otp - Encryption via one-time pad

## SYNOPSIS

package require **Tcl 8.6 9**

package require **tcl::transform::core ?1.1?**

package require **tcl::transform::otp ?1.1?**

**::tcl::transform::otp** *chan* *keychanw* *keychanr*

```

```

## DESCRIPTION

The **tcl::transform::otp** package provides a command creating a channel transformation which uses externally provided one-time pads to perform encryption (on writing) and decryption (on reading).

A related transformations in this module is **tcl::transform::rot**.

The internal **TclOO** class implementing the transform handler is a sub-class of the **tcl::transform::core** framework.

## API

- **::tcl::transform::otp** *chan* *keychanw* *keychanr*

  This command creates a one-time pad based encryption transformation on top of the channel *chan* and returns its handle.

  The two channels *keychanw* and *keychanr* contain the one-time pads for the write and read directions, respectively. Their contents are reads and xored with the bytes written to and read from the channel.

## BUGS, IDEAS, FEEDBACK

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category *virtchannel* of the *Tcllib Trackers* \[http://core.tcl.tk/tcllib/reportlist\]. Please also report any ideas for enhancements you may have for either package and/or documentation.

When proposing code changes, please provide *unified diffs*, i.e the output of **diff -u**.

Note further that *attachments* are strongly preferred over inlined patches. Attachments can be made by going to the **Edit** form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.

## KEYWORDS

channel transformation, cipher, decryption, encryption, one time pad, otp, reflected channel, tip 230, transformation, virtual channel, xor

## CATEGORY

Channels

## COPYRIGHT

```
Copyright (c) 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>
```