(Ruby) SSH Host Key Fingerprint

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Demonstrates how to get the SSH server's host key fingerprint after connecting.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

ssh = Chilkat::CkSsh.new()

hostname = "ssh.example.com"
port = 22
success = ssh.Connect(hostname,port)
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Get the classic MD5 fingeprint
md5_fingerprint = ssh.hostKeyFingerprint()
print md5_fingerprint + "\n";

# Sample output:
# ssh-rsa 3072 21:b0:d8:41:4e:ef:78:10:20:af:01:b7:71:5d:eb:94

# Starting in Chilkat v9.5.0.92, we can also get the SHA256 fingerprint.
# (it is also possible to get fingerprints using other hash algorithms such as SHA384, SHA512, etc.)

includeKeyType = true
includeHashName = true
sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName)
print sha256_fingerprint + "\n";

# Sample output:
# ssh-rsa SHA256:Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

# The key type and hash name can be optionally included or not.
includeKeyType = false
includeHashName = true
sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName)
print sha256_fingerprint + "\n";

# SHA256:Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

includeKeyType = true
includeHashName = false
sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName)
print sha256_fingerprint + "\n";

# ssh-rsa Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

includeKeyType = false
includeHashName = false
sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName)
print sha256_fingerprint + "\n";

# Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=