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#!/usr/bin/env ruby
require 'io/console'
require 'openssl'
require 'base64'
username = ARGV.shift
url = ARGV.shift
length = ARGV.shift.to_i
print('Passphrase: ');
passphrase = STDIN.noecho(&:gets).chomp; print("\n")
salt = "#{username}@#{url}"
iterations = 5000
digest = OpenSSL::Digest::SHA512.new
pbkdf2 = OpenSSL::PKCS5.pbkdf2_hmac(passphrase, salt, iterations, length, digest)
password = Base64.encode64(pbkdf2).chomp[0..length-1]
puts(password)
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