https://github.com/dimchansky/keeloq-go

An implementation of KeeLoq encryption/decryption in Go programming language
https://github.com/dimchansky/keeloq-go

golang keeloq

Last synced: about 1 year ago
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An implementation of KeeLoq encryption/decryption in Go programming language

• Host: GitHub
• URL: https://github.com/dimchansky/keeloq-go
• Owner: dimchansky
• License: apache-2.0
• Created: 2022-09-05T13:10:47.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2022-09-05T13:19:01.000Z (almost 4 years ago)
• Last Synced: 2025-02-09T12:31:09.276Z (over 1 year ago)
• Topics: golang, keeloq
• Language: Go
• Homepage:
• Size: 57.6 KB
• Stars: 2
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# KeeLoq

An implementation of KeeLoq encryption/decryption in Go programming language.

## What is KeeLoq

KeeLoq is a proprietary block cipher owned by [Microchip](https://www.microchip.com/), developed for code-hopping remote key entry (RKE)

devices such as:

- [Microchip HCS200](http://ww1.microchip.com/downloads/en/devicedoc/40138c.pdf)

- [Microchip HCS301](http://ww1.microchip.com/downloads/en/devicedoc/21143b.pdf)

- [EG Micro EG301](https://www.egmicro.com/download/EG301_datasheet.pdf)

and is used in remote key-less entry systems from several car manufacturers - such as [Chrysler](https://www.chrysler.com/), 

[Fiat](https://www.fiat.com/), [GM](https://www.gm.com/), [Honda](https://www.honda.com/), [Toyota](https://www.toyota.com/), 

[Volvo](https://www.volvocars.com/intl), [VW](https://www.vw.com/), [Jaguar](https://www.jaguar.com/index.html), 

[Iran Khodro](https://www.ikco.ir/en/), etc. - as well as for garage door openers.

After the confidential specifications have been leaked on a Russian website ([Code Hopping Decoder using a PIC16C56](http://keeloq.narod.ru/decryption.pdf)) in 2006,

several cryptanalysts have found substantial weaknesses in the design of the algorithm and the hardware on which it is implemented ([Robert R. Enderlein, S Vaudenay, P Sepehrdad. KeeLoq. EPFL, Semester Project 2010.](http://www.e7n.ch/data/e10.pdf)).

Please note this algorithm is pretty weak and should not be used for any real crypto.

## KeeLoq Encryption

KeeLoq is a block cipher with a 64-bit key and a 32-bit block size. The cipher operates on two registers for 528 clock cycles to produce the ciphertext, based on the following shape:

![KeeLoq encryption algorithm)](images/KeeLoq-Encryption.png)

## KeyLoq Decryption

KeeLoq decryption algorithm operates on two registers for 528 rounds, to produce the plaintext for a given key and ciphertext, according to the following shape.

![KeeLoq encryption algorithm)](images/KeeLoq-Decryption.png)

## Test Vectors

| key                  | plaintext    | ciphertext   |

|----------------------|--------------|--------------|

| `0xbeefdeadbeefdead` | `0x2000c022` | `0x054c90c2` |

| `0x5cec6701b79fd949` | `0xf741e2db` | `0xe44f4cdf` | 

| `0x5cec6701b79fd949` | `0x0ca69b92` | `0xa6ac0ea2` |