Information gathering also includes identifying a file by its hash. Not only does the hash help validate a transferred file; it is also commonly used as a unique ID for a file analysis profile:

• Quickhash: This is an open source tool available for Windows, Linux, and macOS that generates the MD5, SHA1, SHA256, and SHA512 of any file. It can be downloaded from https://quickhash-gui.org/.

• HashTab: This tool runs in Windows and can be integrated as a tab in the properties information of a file. It calculates the MD5, SHA1, and a couple of hash algorithms.
• 7-zip: This tool is actually a file archiver, but it has an extension tool that can be enabled to calculate the hash of a file in MD5, SHA1, SHA256, and so forth.