[Updated for 2017]
This post originally was about FCIV, which is no longer the right choice. Today we use CertUtil:
certUtil -hashfile pathToFileToCheck [HashAlgorithm]
HashAlgorithm choices: MD2 MD4 MD5 SHA1 SHA256 SHA384 SHA512
Because I keep forgetting…
fciv Filename.iso -both
Resides in C:\Windows\System32 and requires an elevated command prompt (or the Visual Studio Command Prompt).
If you don’t have fciv, it can be downloaded here: