FileHash

FileHash[file] gives an integer hash code for the contents of the file.

FileHash[file, "type"] gives a hash of the specified type (e.g., "MD5", "SHA256").

Examples

Get default hash:

FileHash["document.txt"]
(* 123456789012345678901234567890 *)

Get SHA-256 hash:

FileHash["document.txt", "SHA256"]

As hexadecimal string:

FileHash["document.txt", "MD5", "HexString"]

Please visit the official Wolfram Language Reference for more details.