Contents

#!/usr/bin/env ruby

require 'fernet'
require 'optparse'
require 'highline/import'

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: fernet-decrypt [-p | -k <keyfile>] -i <ciphertext> -o <plaintext>"

  opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|
    options[:verbose] = v
  end
  opts.on("-p", "--prompt", "Prompt for keys") do |prompt|
    options[:prompt] = prompt
  end
  opts.on("-k", "--keyfile KEYFILE") do |keyfile|
    options[:keyfile] = keyfile
  end
  opts.on("-i", "--infile CIPHERFILE") do |cipherfile|
    options[:cipherfile] = cipherfile
  end
  opts.on("-o", "--outfile PLAINFILE") do |plainfile|
    options[:plainfile] = plainfile
  end
  opts.on("--enforce-ttl") do |ttl|
    options[:ttl] = true
  end
end.parse!

if ENV["FERNET_CLI_KEY"].nil?
  if options[:prompt]
    KEY = ask("Enter Key: ") {|q| q.echo = false}
  elsif options[:keyfile]
    KEY = File.read(options[:keyfile]).chomp
  end
else
  KEY=ENV["FERNET_CLI_KEY"]
end

if KEY.nil?
  puts "i have no key"
  exit(1)
end

if options[:cipherfile].nil? or (! File.readable?(options[:cipherfile]))
  puts "can't read ciphertext file"
  exit(1)
end

plaintext = Fernet.verifier(KEY.chomp, File.read(options[:cipherfile]),
                            enforce_ttl: options[:ttl])
if ! plaintext.valid?
  puts "ciphertext corrupt"
  exit(1)
end

File.open(options[:plainfile], "w+") do |f|
  f.write(plaintext.message)
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
fernet-cli-0.1	bin/fernet-decrypt