Big trouble : rpm empty db, install V3 RSA/SHA1 Signature, key BAD, YumRepo Error

I'm little tired because I have spent hours solving problems, and can't find a solution on Centos 6.6.

I have many troubles:

• rpm db is empty: try googling, find restore process, but always empty


• rpm acces gives an error: V3 RSA/SHA1 Signature, key ID c105b9de: BAD


• yum acces gives an error: YumRepo Error: All mirror URLs are not using ftp, http[s] or file.

How do you debug and use rpm? I need to rollback on today's update of nss-softoken and glibc because they have broken all my curl https calls.