commit 83cbf095987ae58dfc7573cf673ff161c693b65f
Author: DiscourseHosting <michael@discoursehosting.com>
Date:   Sun Sep 7 20:04:01 2014 +0000

    First release

diff --git a/plugin.rb b/plugin.rb
new file mode 100644
index 0000000..00af02a
--- /dev/null
+++ b/plugin.rb
@@ -0,0 +1,129 @@
+# name: discourse-migratepassword
+# about: enable alternative password hashes
+# version: 0.3
+# authors: Jens Maier and Michael@discoursehosting.com
+ 
+# uses phpass-ruby https://github.com/uu59/phpass-ruby
+
+# Usage:
+# When migrating, store a custom field with the user containing the crypted password
+
+# for vBulletin this should be #{password}:#{salt} md5(md5(pass) + salt)
+# for Phorum                   #{password}         md5(pass)
+# for Wordpress                #{password}         phpass(8).crypt(pass)
+
+
+require 'digest'
+
+  class WordpressHash
+    def initialize(stretch=8)
+      @itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
+      stretch = 8 unless (8..30).include?(stretch)
+      @stretch = stretch
+      @random_state = '%s%s' % [Time.now.to_f, $$]
+    end
+
+    def hash(pw)
+      rnd = ''
+      rnd = Phpass.random_bytes(6)
+      crypt(pw, gensalt(rnd))
+    end
+
+    def check(pw, hash)
+      crypt(pw, hash) == hash
+    end
+
+    private
+
+    def gensalt(input)
+      out = '$P$'
+      out << @itoa64[[@stretch + 5, 30].min]
+      out << encode64(input, 6)
+      out
+    end
+
+    def crypt(pw, setting)
+      out = '*0'
+      out = '*1' if setting.start_with?(out)
+      iter = @itoa64.index(setting[3])
+      return out unless (8..30).include?(iter)
+      count = 1 << iter
+      salt = setting[4...12]
+      return out if salt.length != 8
+      hash = Digest::MD5.digest(salt + pw)
+      while count > 0
+        hash = Digest::MD5.digest(hash + pw)
+        count -= 1
+      end
+      setting[0,12] + encode64(hash, 16)
+    end
+
+    def encode64(input, count)
+      out = ''
+      cur = 0
+      while cur < count
+        value = input[cur].ord
+        cur += 1
+        out << @itoa64[value & 0x3f]
+        if cur < count
+          value |= input[cur].ord << 8
+        end
+        out << @itoa64[(value >> 6) & 0x3f]
+        break if cur >= count
+        cur += 1
+
+        if cur < count
+          value |= input[cur].ord << 16
+        end
+        out << @itoa64[(value >> 12) & 0x3f]
+        break if cur >= count
+        cur += 1
+        out << @itoa64[(value >> 18) & 0x3f]
+      end
+      out
+    end
+  end
+
+
+after_initialize do
+ 
+    module ::AlternativePassword
+        def confirm_password?(password)
+            return true if super
+            return false unless self.custom_fields.has_key?('import_pass')
+
+            if AlternativePassword::check_all(password, self.custom_fields['import_pass'])
+                self.password = password
+                self.custom_fields.delete('import_pass')
+                return save
+            end
+            false
+        end
+ 
+        def self.check_all(password, crypted_pass)
+            AlternativePassword::check_vbulletin(password, crypted_pass) ||
+            AlternativePassword::check_md5(password, crypted_pass) ||
+            AlternativePassword::check_wordpress(password, crypted_pass) 
+        end
+
+        def self.check_vbulletin(password, crypted_pass)
+            hash, salt = crypted_pass.split(':', 2)
+            !salt.nil? && hash == Digest::MD5.hexdigest(Digest::MD5.hexdigest(password) + salt)
+        end
+
+        def self.check_md5(password, crypted_pass)
+            crypted_pass == Digest::MD5.hexdigest(password)
+        end
+
+        def self.check_wordpress(password, crypted_pass)
+            hasher = WordpressHash.new(8)
+            hasher.check(password, crypted_pass)
+        end
+    end
+ 
+    class ::User
+        prepend AlternativePassword
+    end
+ 
+end
+