# format
#  user:realm:hashed_passwd
#
# hashed_passwd = MD5(user:realm:plain_passwd)

# 
# user "test", realm "example.com", password "test"
# MD5("test:example:test") = 3441b753b98a6dc702183c989e35970f
# the entry is
test:example.com:3441b753b98a6dc702183c989e35970f