Apple - 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.

Why not check the signature instead? That way, you won't have to rely on an external checksum.

Here's an example of this done with a Mavericks installer (I don't have the Yosemite installer yet):

$ codesign -dvvv Install\ OS\ X\ Mavericks.app/
Executable=…/Install OS X Mavericks.app/Contents/MacOS/Install OS X Mavericks
Identifier=com.apple.InstallAssistant.Mavericks
Format=bundle with Mach-O thin (x86_64)
CodeDirectory v=20100 size=285 flags=0x200(kill) hashes=7+3 location=embedded
Hash type=sha1 size=20
CDHash=9bf12663fe5f73d2780eb2badc2fe7a86a2c7164
Signature size=4169
Authority=Apple Mac OS Application Signing
Authority=Apple Worldwide Developer Relations Certification Authority
Authority=Apple Root CA
Info.plist entries=30
TeamIdentifier=not set
Sealed Resources version=1 rules=14 files=80
Internal requirements count=1 size=124