kryptos

A .NET core tool for cryptography.

Overview

• Features
• Installation
• Usage
• Examples
• Contributing
• License

Features

• UUID generation
• Base64, Base64Url encoding and decoding
• MD5 Hash
• SHA-1, SHA-256, SHA-384, SHA-512 Hash
• JWT decoding
• HMAC-SHA1, HMAC-SHA256, HMAC-SHA384, HMAC-SHA512, HMAC-MD5
• Subresource Integrity
• Cryptographic Object Identifier lookup
• Create self-signed certificates (PFX)
• Encryption and decryption using PFX
• Random Number Generator
• Zip file content information

Installation

Kryptos is available as a .NET Global Tool and can be installed using the .NET Core CLI.

dotnet tool install --global Kryptos

For offline installation, download the nuget package into a folder and run the following command.

dotnet tool install --global Kryptos --add-source FolderWithKryptosNuget\ 

Kryptos is under active development and new features are being added. Update to the latest version using the command below.

dotnet tool update --global Kryptos

Usage

kryptos --help

Examples

1. Decode Base64 encoded string

   kryptos base64 dec -t "VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4="
   

2. Generate SHA-256 hash of file

   kryptos sha256 hash -i .\ubuntu-20.04-desktop-amd64.iso
   

3. Decode a JWT token

   kryptos jwt dec -t eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IlZpamF5c2hpbnZhIEthcm51cmUiLCJpYXQiOjE1MTYyMzkwMjIsImF1ZCI6Imh0dHBzOi8vZ2l0aHViLmNvbS92aWpheXNoaW52YS9rcnlwdG9zIn0.ufklYra5bLYKM-FWnmxI0Tsw_ILmTIDK0cJ7ZkPfwfE
   

4. Generate Subresource Integrity

   kryptos sri hash -u https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css
   

5. Look up Cryptographic Object Identifier

   kryptos oid -t 1.3.6.1.5.5.7.3.1
   

6. Generate a self-signed PFX certificate

   kryptos pfx create -st www.contoso.com -kt password -o contoso.pfx
   

7. Encrypt text using a PFX certificate

   kryptos pfx enc -ci contoso.pfx -kt password -t "The quick brown fox jumps over the lazy dog."
   

Contributing

• Fork the repo on GitHub
• Clone the project to your own machine
• Commit changes to vnext branch
• Push your work back up to your fork
• Be sure to pull the latest from "upstream" before making a pull request!
• Submit a Pull Request so that changes can be reviewed and merged

NOTE: By raising a Pull Request you grant the guardians of this project the necessary ownership or grants of rights over all contributions to distribute under the chosen license.

LICENSE