lib/cose/algorithm/signature_algorithm.rb in cose-0.10.0 vs lib/cose/algorithm/signature_algorithm.rb in cose-0.11.0

@@ -7,8 +7,35 @@
   module Algorithm
     class SignatureAlgorithm < Base
       def verify(key, signature, verification_data)
         valid_signature?(key, signature, verification_data) || raise(COSE::Error, "Signature verification failed")
       end
+
+      def compatible_key?(key)
+        to_pkey(key)
+      rescue COSE::Error
+        false
+      end
+
+      private
+
+      def valid_signature?(key, signature, verification_data)
+        signature_algorithm = signature_algorithm_class.new(hash_function[3..-1])
+        signature_algorithm.verify_key = to_pkey(key)
+
+        begin
+          signature_algorithm.verify(signature, verification_data)
+        rescue OpenSSL::SignatureAlgorithm::Error
+          false
+        end
+      end
+
+      def signature_algorithm_class
+        raise NotImplementedError
+      end
+
+      def to_pkey(_key)
+        raise NotImplementedError
+      end
     end
   end
 end