SHA1 hash for OSX 10.10 Yosemite public release?
I run your request and here is the result.

eebf02a20ac27665a966957eec6f5e6fe3228a19  /Applications/Install OS X Yosemite.app/Contents/SharedSupport/InstallESD.dmg


And for Yosemite 10.10.1 the shasum is:

a673c2c6d967f4da2934b7d6cf3736936970b194


Please wait about a minute or two for Terminal to get the number.