lib/poly_pseudo/pseudonym.rb in poly_pseudo-0.1.4 vs lib/poly_pseudo/pseudonym.rb in poly_pseudo-0.2.0

@@ -1,8 +1,23 @@
 module PolyPseudo
   class Pseudonym
     include PolyPseudo::PseudoId
 
+    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
+
     # @param [PolyPseudo::Key] closing_key
     def decrypt(decryption_key, closing_key)
       PolyPseudo.init!
       decryption_private_key = decryption_key.ec.private_key
       closing_private_key    = closing_key.ec.private_key