Add a test case for the TPMLIB_DecodeBlob API

Add a test case testing the TPMLIB_DecodeBlob function.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Acked-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
Make libtpms compileable with OpenSSL

Implement missing base64 decoder support when using OpenSSL library.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Acked-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
Fix compile error on cygwin

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Acked-by: Corey Bryant <coreyb@linux.vnet.ibm.com>