Bluecrypt SSH Fingerprint (for Browsers)

A minimal library to read an SSH public key (id_rsa.pub) and generate its fingerprint.

Works for RSA and ECDSA public keys.

Features

< 150 lines of code | 1.1kb gzipped | 2.4kb minified | 4.1kb with comments

• SSH Public Key SHA256 Fingerprints
  • RSA (2048-bit, 3072-bit, 4096-bit)
  • EC / ECDSA
    • P-256 (prime256v1, secp256r1)
    • P-384 (secp384r1)
• Node.js version
  • Greenlock SSH Fingerprint

Need SSH Private Keys?

SSH private keys (id_rsa) are just normal PEM files, so you can use Eckles or Rasha, as mentioned above.

Web Demo

https://coolaj86.com/demos/ssh-fingerprint/

git clone https://git.coolaj86.com/coolaj86/bluecrypt-ssh-fingerprint.js
pushd bluecrypt-ssh-fingerprint.js/

open index.html

Install

You can use it as a plain-old javascript library:

<script src="https://git.coolaj86.com/coolaj86/bluecrypt-ssh-fingerprint.js/raw/branch/master/ssh-fingerprint.js"></script>

It's also on npm:

npm install bluecrypt-ssh-fingerprint

Usage

Very simple:

var pub = 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCba21UHE+VbDTpmYYFZUOV+OQ8AngOCdjROsPC0KiEfMvEaEM3NQl58u6QL7G7QsErKViiNPm9OTFo6HF5JijfWzK7haHFuRMEsgI4VwIYyhvqlJDfw/wt0AiVvSmoMfEQn1p1aiaO4V/RJSE3Vw/uz2bxiT22uSkSqOyShyfYE6dMHnuoBkzr4jvSifT+INmbv6Nyo4+AAMCZtYeHLrsFeSTjLL9jMPjI4ZkVdlw2n3Xn9NbltF3/8Ao8dQfElqw+LIQWqU0oFHYNIP4ttfl5ObMKHaKSvBMyNruZR0El/ZsrcHLkAHRCLj07KRQJ81l5CUTPtQ02P1Eamz/nT4I3 rsa@localhost';

SSH.fingerprint({ pub: pub }).then(function (fing) {
  console.info('The key fingerprint is:');
  console.info(fing.fingerprint);
});

Other Tools in the Bluecrypt Suite

• Browser JWK to SSH
• Browser SSH to JWK
• Browser ASN.1 parser (for x509, etc)
• Browser ASN.1 packer (for x509, etc)

Legal

ssh-fingerprint.js | MPL-2.0 | Terms of Use | Privacy Policy

Bluecrypt™ is owned by AJ ONeal