# File lib/active_record/vendor/mysql411.rb, line 141
  def scramble411( password, seed, old_ver )
    return "" if password == nil or password == ""
    raise "old version password is not implemented" if old_ver
    
    #    print "Seed Bytes = "
    #    seed.each_byte { |b| print "0x#{b.to_s( 16 )}, " }
    #    puts
    
    stage1 = Digest::SHA1.digest( password )
    stage2 = Digest::SHA1.digest( stage1 )
    
    dgst = Digest::SHA1.new
    dgst << seed
    dgst << stage2
    stage3 = dgst.digest
    
    #    stage1.zip( stage3 ).map { |a, b| (a ^ b).chr }.join
    scrambled = ( 0 ... stage3.size ).map { |i| stage3[i] ^ stage1[i] }
    scrambled = scrambled.map { |x| x.chr }
    scrambled.join
  end