GtkHash is a desktop utility for computing message digests or checksums. Most well-known hash functions are supported, including MD5, SHA1, SHA2 (SHA256/SHA512), SHA3 and BLAKE2. It’s designed to be an easy to use, graphical alternative to command-line tools such as md5sum.

Some interesting features:

• Support for verifying checksum files from sfv, sha256sum, etc.
• Keyed hashing (HMAC)
• Parallel/multi-threaded hash calculation
• Remote file access using GIO/GVfs
• File manager integration
• Small and fast, written in C