require 'openssl' class Signer # Digest algorithms supported "out of the box" DIGEST_ALGORITHMS = { # SHA 1 sha1: { name: 'SHA1', id: 'http://www.w3.org/2000/09/xmldsig#sha1', digester: lambda { OpenSSL::Digest::SHA1.new }, }, # SHA 256 sha256: { name: 'SHA256', id: 'http://www.w3.org/2001/04/xmlenc#sha256', digester: lambda { OpenSSL::Digest::SHA256.new }, }, # SHA512 sha512: { name: 'SHA512', id: 'http://www.w3.org/2001/04/xmlenc#sha512', digester: lambda { OpenSSL::Digest::SHA512.new }, }, # GOST R 34-11 94 gostr3411: { name: 'GOST R 34.11-94', id: 'http://www.w3.org/2001/04/xmldsig-more#gostr3411', digester: lambda { OpenSSL::Digest.new('md_gost94') }, }, } # Class that holds +OpenSSL::Digest+ instance with some meta information for digesting in XML. class Digester # You may pass either a one of +:sha1+, +:sha256+ or +:gostr3411+ symbols # or +Hash+ with keys +:id+ with a string, which will denote algorithm in XML Reference tag # and +:digester+ with instance of class with interface compatible with +OpenSSL::Digest+ class. def initialize(algorithm) if algorithm.kind_of? Symbol @digest_info = DIGEST_ALGORITHMS[algorithm].dup @digest_info[:digester] = @digest_info[:digester].call @symbol = algorithm else @digest_info = algorithm end end attr_reader :symbol # Digest def digest(message) self.digester.digest(message) end alias call digest # Returns +OpenSSL::Digest+ (or derived class) instance def digester @digest_info[:digester].reset end # Human-friendly name def digest_name @digest_info[:name] end # XML-friendly name (for specifying in XML +DigestMethod+ node +Algorithm+ attribute) def digest_id @digest_info[:id] end end end