merge cleaner version (#2)

* 1st attempt for a (more or less) 'final' version

* report NOMEMORY on buffer allocation failure

* md5.c: use types from stdint.h (C99)

README.md

@@ -1,10 +1,8 @@
 ### Purpose
 
-- provide the password needed to open the encrypted private key file
-(/var/flash/websrv_ssl_key.pem) from FRITZ!OS versions above 06.20
+- provide the password needed to open the encrypted private key file (/var/flash/websrv_ssl_key.pem) from FRITZ!OS versions above 06.20
 - new version computes the password itself from ```maca``` value
 - no more hassle with static vs. dynamic linking and/or using the proxy binary
-- the project contains a library (shared and static), the exported functions are backward-compatible with previous version(s)
-- some function from previous versions are useless now and are implemented as 'dummy function'
+- the project contains a library (shared and static), some older and (as far as I know) unused functions have been removed from the interface
 - the computation of MD5 hashes (in md5.c) was copied (with some minor changes) from the uClibc sources - the (default) libuclibc/libcrypt does not export the needed functions, so they were duplicated here
 - the provided binary ```privatekeypassword``` may be used from other programs (or shell scripts) to get the clear-text of the password for the private key file