Class: Cryptorecord::Openpgpkeys

Inherits:
Object
  • Object
show all
Defined in:
lib/cryptorecord/openpgpkeys.rb

Overview

Cryptorecord::Openpgpkeys-class generates openphpkeys-dns-records. Instances must have an uid. The PGP-Key can be read from file

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ Openpgpkeys

This constructor initializes uid and key by calling the setters.

Parameters:

  • args (Hash) (defaults to: {}) —

    the options to initialize the object with

Options Hash (args):

  • uid (String) —

    email-address associated with the pgp-key

  • key (String) —

    pgp-key

See Also:



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# File 'lib/cryptorecord/openpgpkeys.rb', line 42

def initialize(args = {})
  self.uid = args.fetch(:uid, nil)
  self.key = args.fetch(:key, nil)
end

Instance Attribute Details

#key ⇒ String

Returns the pgp-key as a string.

Returns:

  • (String) —

    the pgp-key as a string



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# File 'lib/cryptorecord/openpgpkeys.rb', line 33

class Openpgpkeys
  attr_reader :uid, :key

  # This constructor initializes uid and key by calling the setters.
  # @see uid=
  #
  # @param [Hash] args the options to initialize the object with
  # @option args [String] uid email-address associated with the pgp-key
  # @option args [String] key pgp-key
  def initialize(args = {})
    self.uid = args.fetch(:uid, nil)
    self.key = args.fetch(:key, nil)
  end

  # This setter takes the argument val to create a Mail::Address-object.
  # The argument val can be a email-address-string or a Mail::Address-object.
  # Make sure this is the proper uid for the pgp-key!
  #
  # @param [String|Mail::Address] val The email-address without brackets
  # @raise Cryptorecord::ArgumentError
  def uid=(val)
    if val.nil?
      @uid = nil
      return
    end

    case val
    when String
      @uid = Mail::Address.new("<#{val}>")
    when Mail::Address
      @uid = Mail::Address.new("<#{val.address}>")
    else
      raise Cryptorecord::ArgumentError,
            "Unsupported datatype #{val.class} for val"
    end
  end

  # This getter returns the SHA256sum of the
  # uid-local-part(email-address) as defined
  # in rfc7929
  #
  # @return [String] the local-part of the keys
  #  uid(email-address) as SHA256 reduced to 56bytes or nil
  def localpart
    @uid.nil? ? nil : OpenSSL::Digest::SHA256.new(@uid.local.to_s).to_s[0..55]
  end

  # This getter returns the domain-part of the uid(email-address) or nil
  #
  # @return [String] domain the domain-part of the keys uid(email-address)
  def domain
    @uid.nil? ? nil : @uid.domain
  end

  # This method sets the pgp-key. It takes the public-key-block
  # and trims the header, blankline and checksum
  #
  # @param [String] val PGP-Public-Key-Block(ASCII Armor)
  #  as defined in rfc4880 section 6.2
  def key=(val)
    return if val.nil?

    @key = ''
    val.split(/\n/).each do |x|
      @key += trimpgpkey(x).to_s
    end
    @key = @key.gsub(/=.{4}$/, '')
  end

  # This method reads the pgp-key from a given file
  #
  # @param [String] keyfile Path to the keyfile
  # @raise Cryptorecord::ArgumentError
  def read_file(keyfile)
    raise Cryptorecord::ArgumentError, 'No keyfile defined' if keyfile.nil?
    data = File.read(keyfile)
    self.key = data
  end

  # This method concats the openpgpkey-record
  #
  # @return [String] openpgpkey dns-record as defined in rfc7929
  def to_s
    "#{localpart}._openpgpkey.#{domain}. IN OPENPGPKEY #{@key}"
  end

  private

  # This function trims the pgpkey so that all headers, footers,
  # blanklines, and stuff
  # are gone
  #
  # @param [String] val onne line of the pgpkey-block
  #
  # @return An empty string if something has to be trimmed,
  # otherwise the line itself
  def trimpgpkey(val)
    case val
    when '-----BEGIN PGP PUBLIC KEY BLOCK-----'
      ''
    when  '-----END PGP PUBLIC KEY BLOCK-----'
      ''
    when  /^\s*\n$/
      ''
    else
      val.to_s
    end
  end
end

#uid ⇒ Mail::Address

Returns the userid or nil.

Returns:

  • (Mail::Address) —

    the userid or nil



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# File 'lib/cryptorecord/openpgpkeys.rb', line 33

class Openpgpkeys
  attr_reader :uid, :key

  # This constructor initializes uid and key by calling the setters.
  # @see uid=
  #
  # @param [Hash] args the options to initialize the object with
  # @option args [String] uid email-address associated with the pgp-key
  # @option args [String] key pgp-key
  def initialize(args = {})
    self.uid = args.fetch(:uid, nil)
    self.key = args.fetch(:key, nil)
  end

  # This setter takes the argument val to create a Mail::Address-object.
  # The argument val can be a email-address-string or a Mail::Address-object.
  # Make sure this is the proper uid for the pgp-key!
  #
  # @param [String|Mail::Address] val The email-address without brackets
  # @raise Cryptorecord::ArgumentError
  def uid=(val)
    if val.nil?
      @uid = nil
      return
    end

    case val
    when String
      @uid = Mail::Address.new("<#{val}>")
    when Mail::Address
      @uid = Mail::Address.new("<#{val.address}>")
    else
      raise Cryptorecord::ArgumentError,
            "Unsupported datatype #{val.class} for val"
    end
  end

  # This getter returns the SHA256sum of the
  # uid-local-part(email-address) as defined
  # in rfc7929
  #
  # @return [String] the local-part of the keys
  #  uid(email-address) as SHA256 reduced to 56bytes or nil
  def localpart
    @uid.nil? ? nil : OpenSSL::Digest::SHA256.new(@uid.local.to_s).to_s[0..55]
  end

  # This getter returns the domain-part of the uid(email-address) or nil
  #
  # @return [String] domain the domain-part of the keys uid(email-address)
  def domain
    @uid.nil? ? nil : @uid.domain
  end

  # This method sets the pgp-key. It takes the public-key-block
  # and trims the header, blankline and checksum
  #
  # @param [String] val PGP-Public-Key-Block(ASCII Armor)
  #  as defined in rfc4880 section 6.2
  def key=(val)
    return if val.nil?

    @key = ''
    val.split(/\n/).each do |x|
      @key += trimpgpkey(x).to_s
    end
    @key = @key.gsub(/=.{4}$/, '')
  end

  # This method reads the pgp-key from a given file
  #
  # @param [String] keyfile Path to the keyfile
  # @raise Cryptorecord::ArgumentError
  def read_file(keyfile)
    raise Cryptorecord::ArgumentError, 'No keyfile defined' if keyfile.nil?
    data = File.read(keyfile)
    self.key = data
  end

  # This method concats the openpgpkey-record
  #
  # @return [String] openpgpkey dns-record as defined in rfc7929
  def to_s
    "#{localpart}._openpgpkey.#{domain}. IN OPENPGPKEY #{@key}"
  end

  private

  # This function trims the pgpkey so that all headers, footers,
  # blanklines, and stuff
  # are gone
  #
  # @param [String] val onne line of the pgpkey-block
  #
  # @return An empty string if something has to be trimmed,
  # otherwise the line itself
  def trimpgpkey(val)
    case val
    when '-----BEGIN PGP PUBLIC KEY BLOCK-----'
      ''
    when  '-----END PGP PUBLIC KEY BLOCK-----'
      ''
    when  /^\s*\n$/
      ''
    else
      val.to_s
    end
  end
end

Instance Method Details

#domain ⇒ String

This getter returns the domain-part of the uid(email-address) or nil

Returns:

  • (String) —

    domain the domain-part of the keys uid(email-address)



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# File 'lib/cryptorecord/openpgpkeys.rb', line 83

def domain
  @uid.nil? ? nil : @uid.domain
end

#localpart ⇒ String

This getter returns the SHA256sum of the uid-local-part(email-address) as defined in rfc7929

Returns:

  • (String) —

    the local-part of the keys uid(email-address) as SHA256 reduced to 56bytes or nil



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# File 'lib/cryptorecord/openpgpkeys.rb', line 76

def localpart
  @uid.nil? ? nil : OpenSSL::Digest::SHA256.new(@uid.local.to_s).to_s[0..55]
end

#read_file(keyfile) ⇒ Object

This method reads the pgp-key from a given file

Parameters:

  • keyfile (String) —

    Path to the keyfile

Raises:

  • Cryptorecord::ArgumentError



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# File 'lib/cryptorecord/openpgpkeys.rb', line 106

def read_file(keyfile)
  raise Cryptorecord::ArgumentError, 'No keyfile defined' if keyfile.nil?
  data = File.read(keyfile)
  self.key = data
end

#to_s ⇒ String

This method concats the openpgpkey-record

Returns:

  • (String) —

    openpgpkey dns-record as defined in rfc7929



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# File 'lib/cryptorecord/openpgpkeys.rb', line 115

def to_s
  "#{localpart}._openpgpkey.#{domain}. IN OPENPGPKEY #{@key}"
end