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 numerous hash algorithms including CRC32, MD5, SHA family, SHA3, BLAKE2, BLAKE3, Tiger, TTH, AICH, ed2k, Whirlpool, GOST, and RIPEMD-160.Multiple hashes can be calculated simultaneously in a single pass, efficient for creating comprehensive hash manifests. The default output format is SFV with CRC32; this can be changed with --bsd, --simple, --magnet, or --printf.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

-C, --crc32

Calculate CRC32 checksum.

-M, --md5

Calculate MD5 hash.

-H, --sha1

Calculate SHA1 hash.

--sha256

Calculate SHA-256 hash.

--sha512

Calculate SHA-512 hash.

--sha3-256

Calculate SHA3-256 hash.

--blake2b

Calculate BLAKE2b hash.

-a, --all

Calculate all supported hashes.

--list-hashes

Display names of supported hash functions.

-c, --check

Verify hashes from file.

-u, --update FILE

Add new digests to existing hash file.

-k, --check-embedded

Verify files by CRC32 embedded in filenames.

-B, --benchmark

Run benchmark for selected hash algorithm(s).

-r, --recursive

Process directories recursively.

--follow

Follow symbolic links when processing recursively.

-m, --message TEXT

Calculate hash of a text message instead of a file.

-o, --output FILE

Output to file.

--bsd

Use BSD output format.

--sfv

Use SFV output format (default).

--simple

Use simple format (hash followed by filename).

-g, --magnet

Output magnet link.

-e, --embed-crc

Rename file with embedded CRC32 in filename.

-v, --verbose

Show more detailed output.

-P, --percents

Show progress percentage during processing.

--speed

Display processing speed.

-p FMT, --printf FMT

Custom output format using format directives.

--template FILE

Read output format from file.

-b, --base64

Output hash in Base64 encoding.

--hex

Output hash in hexadecimal (default).

--uppercase

Output hash in uppercase hexadecimal.

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.