rhash

Calculate and verify file checksums

TLDR

Calculate SHA256 hash

$ rhash --sha256 [file]

Calculate multiple hashes

$ rhash --md5 --sha1 --sha256 [file]

Calculate all supported hashes

$ rhash --all [file]

Verify hash from file

$ rhash -c [hashfile.sha256]

Create hash file

$ rhash --sha256 [file] -o [file.sha256]

Hash all files recursively

$ rhash -r --sha256 [directory]

Output in BSD format

$ rhash --bsd --sha256 [file]

Calculate CRC32

$ rhash --crc32 [file]

SYNOPSIS

rhash [--algorithm] [-c] [-r] [-o file] [options] files

rhash (Recursive Hasher) calculates and verifies message digests and checksums for files. It supports over 30 hash algorithms including MD5, SHA family, CRC32, Tiger, and ed2k.
Multiple hashes can be calculated simultaneously in a single pass, efficient for creating comprehensive hash manifests. Output formats include standard, BSD tag format, and SFV.
Verification mode (-c) reads hash files and checks files against stored values. It reports mismatches and missing files. Update mode modifies existing hash files with new entries.
Magnet link output creates links usable with BitTorrent clients. The link includes file hash, size, and optionally file name.
The --embed-crc option renames files to include CRC32 in the filename (common for anime/video files). This enables at-a-glance integrity checking.
Custom output formats via --printf allow integration with other tools. Templates use tokens for filename, hash, size, etc.

PARAMETERS

--md5

Calculate MD5 hash.

--sha1

Calculate SHA1 hash.

--sha256

Calculate SHA-256 hash.

--sha512

Calculate SHA-512 hash.

--crc32

Calculate CRC32.

--all, -a

Calculate all supported hashes.

-c, --check

Verify hashes from file.

-r, --recursive

Process directories recursively.

-o, --output FILE

Output to file.

--bsd

Use BSD output format.

--sfv

Use SFV output format.

--magnet

Output magnet link.

-u, --update

Update hash file.

--embed-crc

Rename file with embedded CRC.

-q, --quiet

Quiet mode.

-p FMT, --printf FMT

Custom output format.

CAVEATS

Large files take time to hash. Some algorithms (MD5, SHA1) are cryptographically weak. Not all algorithms supported on all platforms. Hash file formats vary between tools. CRC32 is not collision-resistant.

HISTORY

rhash was created by Aleksey Kravchenko around 2005 as a fast, comprehensive hash calculation tool. Written in C, it emphasizes performance and supports more algorithms than most similar tools. The project continues development with regular updates for new hash functions.