lib/commonmeta/utils.rb in commonmeta-ruby-3.0.2 vs lib/commonmeta/utils.rb in commonmeta-ruby-3.0.3

@@ -1335,12 +1335,15 @@
         }.compact]
       end
     end
 
     def encode_doi(prefix)
-      random_int = SecureRandom.random_number(2**63..(2**64) - 1)
-      suffix = Base32::URL.encode(random_int)
-      str = "#{suffix[0, 7]}-#{suffix[6, 7]}"
+      # DOI suffix is a generated from a random number, encoded in base32
+      # suffix has 8 digits plus two checksum digits. With base32 there are 
+      # 32 possible digits, so 8 digits gives 32^8 possible combinations
+      random_int = SecureRandom.random_number(32**7..(32**8) - 1)
+      suffix = Base32::URL.encode(random_int, checksum: true)
+      str = "#{suffix[0, 5]}-#{suffix[5, 10]}"
       "https://doi.org/#{prefix}/#{str}"
     end
 
     def decode_doi(doi)
       suffix = doi.split('/', 5).last