Some backend implementation did reset context by default, so this
should create backend api consistent.
git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@578 36d66b0a-2a48-0410-832c-cd162a569da5
(gcrypt, OpenSSL, NSS and kernel crypto API supported for now).
There backends will be used for LUKS and plain passphrase hashing.
(Not yet used without following patches).
git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@407 36d66b0a-2a48-0410-832c-cd162a569da5