space hash

space-hash.rb

@@ -0,0 +1,31 @@
+require 'digest'
+
+def prompt(*args)
+    print(*args)
+    gets.chomp
+end
+
+WHITESPACE = " \t\u200b\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000"
+
+def doit(message, regex, limit = 10)
+  return unless limit > 0
+
+  digest = Digest::SHA256.hexdigest message
+  if regex.match? digest
+    p message
+    puts digest
+    exit 0
+  end
+
+  WHITESPACE.each_char do |ws|
+    doit(message + ws, regex, limit - 1)
+  end
+end
+
+message = prompt "Message: "
+hash_regex = Regexp.new(prompt "Digest regex: ")
+
+doit(message, hash_regex)
+
+puts "i give up :("
+exit 1