diff --git a/lib/minisign/public_key.rb b/lib/minisign/public_key.rb
index 3572b4c..effccbb 100644
--- a/lib/minisign/public_key.rb
+++ b/lib/minisign/public_key.rb
@@ -14,11 +14,10 @@ def initialize(str)
       @decoded = Base64.strict_decode64(parts.last)
       @public_key = @decoded[10..]
       @verify_key = Ed25519::VerifyKey.new(@public_key)
-      if parts.length == 1
-        data = Base64.strict_encode64("Ed#{@decoded[2..9]}#{@public_key}")
-        @untrusted_comment = "minisign public key #{key_id}\n#{data}\n"
+      @untrusted_comment = if parts.length == 1
+        "minisign public key #{key_id}\n#{key_data}\n"
       else
-        @untrusted_comment = parts.first.split("untrusted comment: ").last
+        parts.first.split("untrusted comment: ").last
       end
     end
 
@@ -48,9 +47,12 @@ def verify(sig, message)
       "Signature and comment signature verified\nTrusted comment: #{sig.trusted_comment}"
     end
 
+    def key_data
+      Base64.strict_encode64("Ed#{@decoded[2..9]}#{@public_key}")
+    end
+
     def to_s
-      data = Base64.strict_encode64("Ed#{@decoded[2..9]}#{@public_key}")
-      "untrusted comment: #{@untrusted_comment}\n#{data}\n"
+      "untrusted comment: #{@untrusted_comment}\n#{key_data}\n"
     end
 
     private