Class: WSS4R::Security::Xml::EncryptedData

Inherits:
Object
  • Object
show all
Defined in:
lib/wss4r/security/xml/encrypted_data.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(security_token = nil) ⇒ EncryptedData

Returns a new instance of EncryptedData.



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 8

def initialize(security_token=nil)
  if (security_token != nil)
    @security_token = security_token
  end
  @sessionkey_algorithm = Types::ALGORITHM_3DES_CBC
end

Instance Attribute Details

#algorithm ⇒ Object

Returns the value of attribute algorithm.



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 6

def algorithm
  @algorithm
end

#cipher_value ⇒ Object

Returns the value of attribute cipher_value.



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 6

def cipher_value
  @cipher_value
end

#ref_id ⇒ Object

Returns the value of attribute ref_id.



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 6

def ref_id
  @ref_id
end

#security_token ⇒ Object

Returns the value of attribute security_token.



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 6

def security_token
  @security_token
end

#sessionkey_algorithm ⇒ Object

Returns the value of attribute sessionkey_algorithm.



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 6

def sessionkey_algorithm
  @sessionkey_algorithm
end

Instance Method Details

#decrypt(document, encrypted_key) ⇒ Object 



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 81

def decrypt(document, encrypted_key)
  if (algorithm == Types::ALGORITHM_3DES_CBC) 
    symmetric_encrypter = TripleDESSymmetricEncrypter.new(encrypted_key.symmetric_key())
  elsif (algorithm == Types::ALGORITHM_AES_CBC)
    symmetric_encrypter = AESSymmetricEncrypter.new(encrypted_key.symmetric_key())
  elsif (algorithm == Types::ALGORITHM_AES128_CBC)
    symmetric_encrypter = AES128SymmetricEncrypter.new(encrypted_key.symmetric_key())
  else
    raise "Unsupported encryption algorithm #{algorithm}"
  end
  raw_data = Base64.decode64(@cipher_value)
  symmetric_encrypter.iv=(raw_data)
  decrypted_element = symmetric_encrypter.decrypt(raw_data)
  reference = encrypted_key.reference_list().uris()[0]		
  reference = reference[1..-1] # remove leading #
  encrypted_element = XPath.first(document, "//*[@Id='"+reference+"']")
  parent = encrypted_element.parent()
		
  #document.root().delete_element("//" + Names::SECURITY)
  parent.delete(encrypted_element)
		
  new_element = Document.new(decrypted_element)
  parent.add(new_element)
  #puts("encrypted_data.decrypt: " + element.to_s())
end

#process(document) ⇒ Object 



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 24

def process(document)
  root = document.root()
  soap_ns = nil
  soap_prefix = root.prefix()
  root.attributes.each_attribute() {|attr|
    if (attr.value() == Namespaces::S11)
      soap_ns = Namespaces::S11
    end
    if (attr.value() == Namespaces::S12)
      soap_ns = Namespaces::S12
    end
  }
  old_soap_body = XPath.first(document, "/env:Envelope/env:Body", {SOAPParser::soap_prefix=>SOAPParser::soap_ns})
  #old_soap_body = SOAPParser.part(SOAPParser::BODY)

  soap_body_string = ""
  if defined?(REXML::Formatters)
    formatter = REXML::Formatters::Default.new
    old_soap_body.each_element(){|e|            
      formatter.write(e, soap_body_string)
    }
  else
    old_soap_body.each_element(){|e|            
      e.write(soap_body_string)
    }
  end                        
  root.delete(old_soap_body)
  soap_body = root.add_element(Names::BODY)
  old_soap_body.attributes().each_attribute{|a|
    soap_body.add_attribute(a.expanded_name(), a.value())
    #puts(a.expanded_name() + " => " + a.value())
  }
  digest = CryptHash.new().digest_b64(soap_body.to_s()).strip()
  encrypted_data = soap_body.add_element(Names::ENCRYPTED_DATA)
  encrypted_data.add_namespace("xmlns:xenc", Namespaces::XENC)
  @ref_id = "EncryptedContent-"+digest.to_s()
  encrypted_data.add_attributes({"Type"=>Types::XENC_CONTENT, "Id"=>@ref_id})

  if (@sessionkey_algorithm == Types::ALGORITHM_3DES_CBC)
    symmetric_encrypter = TripleDESSymmetricEncrypter.new()
  elsif (@sessionkey_algorithm == Types::ALGORITHM_AES_CBC)
    symmetric_encrypter = AESSymmetricEncrypter.new()
  elsif (@sessionkey_algorithm == Types::ALGORITHM_AES128_CBC)
    symmetric_encrypter = AES128SymmetricEncrypter.new()            
  else
    raise "Unsupported encryption algorithm #{@sessionkey_algorithm}"
  end
  encryption_method = encrypted_data.add_element(Names::ENCRYPTION_METHOD)
  encryption_method.add_attribute("Algorithm", @sessionkey_algorithm)
  encrypted_body = symmetric_encrypter.encrypt_to_b64(symmetric_encrypter.iv() + soap_body_string)
  encrypted_key = EncryptedKey.new(@security_token, symmetric_encrypter, self)
  cipher_data = encrypted_data.add_element(Names::CIPHER_DATA)
  cipher_value = cipher_data.add_element(Names::CIPHER_VALUE)
  cipher_value.text=(encrypted_body.gsub("\n",""))
  encrypted_key.process(document)      
end

#unprocess(encrypted_data) ⇒ Object 



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# File 'lib/wss4r/security/xml/encrypted_data.rb', line 15

def unprocess(encrypted_data)
  cipher_value = XPath.first(encrypted_data, "xenc:CipherData/xenc:CipherValue", {"xenc" => Namespaces::XENC})
  algorithm = XPath.first(encrypted_data, "xenc:EncryptionMethod", {"xenc" => Namespaces::XENC})
  ref_id = encrypted_data.attributes["Id"]
  self.cipher_value=(cipher_value.text())
  self.ref_id=(ref_id)
  self.algorithm=(algorithm.attributes["Algorithm"])
end