Class: PolyPseudo::Pseudonym

Inherits:
Object
  • Object
show all
Includes:
PseudoId
Defined in:
lib/poly_pseudo/pseudonym.rb

Instance Attribute Summary

Attributes included from PseudoId

#creator, #point_1, #point_2, #point_3, #recipient, #recipient_key_set_version, #schema_key_version, #schema_version, #type

Class Method Summary collapse

Instance Method Summary collapse

Methods included from PseudoId

#initialize

Class Method Details

.from_asn1(asn1) ⇒ Object 



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# File 'lib/poly_pseudo/pseudonym.rb', line 5

def self.from_asn1(asn1)
  attributes = {}
  attributes["Type"]                   = asn1.value[0].value.to_s
  attributes["SchemaVersion"]          = asn1.value[1].value.to_i
  attributes["SchemaKeyVersion"]       = asn1.value[2].value.to_i
  attributes["Creator"]                = asn1.value[3].value.to_s
  attributes["Recipient"]              = asn1.value[4].value.to_s
  attributes["RecipientKeySetVersion"] = asn1.value[5].value.to_i
  attributes["Point1"]                 = OpenSSL::PKey::EC::Point.new(PolyPseudo.config.group, OpenSSL::BN.new(asn1.value[7].value[0].value, 2))
  attributes["Point2"]                 = OpenSSL::PKey::EC::Point.new(PolyPseudo.config.group, OpenSSL::BN.new(asn1.value[7].value[1].value, 2))
  attributes["Point3"]                 = OpenSSL::PKey::EC::Point.new(PolyPseudo.config.group, OpenSSL::BN.new(asn1.value[7].value[2].value, 2))

  new(attributes)
end

Instance Method Details

#decrypt(decryption_key, closing_key) ⇒ Object

Parameters:



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# File 'lib/poly_pseudo/pseudonym.rb', line 21

def decrypt(decryption_key, closing_key)
  PolyPseudo.init!
  decryption_private_key = decryption_key.ec.private_key
  closing_private_key    = closing_key.ec.private_key

  product            = decryption_private_key.mod_mul(closing_private_key, PolyPseudo.config.group.order)
  point_2_multiplied = point_2.mul(closing_private_key)

  pseudo_point        = point_1
      .mul(product)
      .invert!
      .add(point_2_multiplied)
      .make_affine!

  @pseudonym = closing_key.recipient_key_set_version.to_s + pseudo_point.to_hex
end

#pseudonym ⇒ Object Also known as: pseudo_id 



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# File 'lib/poly_pseudo/pseudonym.rb', line 38

def pseudonym
  @pseudonym || raise("Pseudonym not decrypted yet. call .decrypt first")
end