Renamed Sha256 to HmacSha256 which includes both SHA-256 and HMAC-SHA-256.
Renamed Sha256 to HmacSha256 which includes both SHA-256 and HMAC-SHA-256.

git-svn-id: a5379eb5ca3beb2b6e029be3b1b7f6aa53f2352b@3942 e3ddb328-5bfe-0310-b762-aafcbcbd2528

sebastiangraf/treetank,sebastiangraf/treetank,sebastiangraf/treetank