add JCryption::digest and specs

2 files changed, 24 insertions, 1 deletions

diff --git a/lib/ayk/jcryption.rb b/lib/ayk/jcryption.rb
index 3b4871f..d498184 100644
--- a/lib/ayk/jcryption.rb
+++ b/lib/ayk/jcryption.rb
@@ -25,6 +25,8 @@
 #----------------------------------------------------------------------------
 #
 require 'ayk/maths'
+require 'digest/md5'
+require 'digest/sha2'
 #
 module JCryption
     #
@@ -47,5 +49,22 @@ module JCryption
         OpenSSL::PKey::RSA.generate( bits )
     end
     module_function :gen_keypair
+    #
+    def digest passwd, salt=nil
+        n = passwd.length
+        i = ((n/2)+1)-n%8
+        i=0 if i<0
+        if salt.nil?
+            m = Digest::MD5.new
+            m << Time.now.to_s
+            n = Time.now.to_i%20
+            salt = m.to_s[n..n+12]
+        end
+        d = Digest::SHA2.new << passwd[0..i]+salt+passwd[i+1..-1]
+        [d,salt]
+    end
+    module_function :digest
+    #
 end
-
+#
+# EOF
diff --git a/spec/jcryption_spec.rb b/spec/jcryption_spec.rb
index ce1d174..85901de 100644
--- a/spec/jcryption_spec.rb
+++ b/spec/jcryption_spec.rb
@@ -15,6 +15,10 @@ describe JCryption do
             h['passwd'].should eql "my_password"
             h['timestamp'].should eql "1252937955"
         end
+        it 'should digest salted passwd' do
+            d,s = JCryption::digest 'mylovelypasswd'
+            JCryption::digest('mylovelypasswd',s)[0].should == d
+        end
     end
 end
 #