meta4ra -- Metalink4 utilities

meta4-create utility is used to create Metalink4
(https://datatracker.ietf.org/doc/html/rfc5854)
.meta4-file for single specified file.
Look for its -help for invocation information.

-hashes are comma-separated list of colon-separated pairs of hash'es
name and the external command used to compute it. Command shall take
the data from stdin and print the digest in hexadecimal form with the
following newline to stdout.

Following hashes are predefined by default:

* sha-256:sha256 -- standardized name; standard command in many OSes
                    May be fast on hardware accelerated CPUs.
* sha-512:sha512 -- standardized name; standard command in many OSes
                    Faster on 64-bit CPUs than software sha-256.
* skein-256:skein256 -- non-standardized name; out-of-box command in FreeBSD
                        Faster than software sha-*/shake*.
* skein-512:skein512 -- non-standardized name; out-of-box command in FreeBSD
                        Faster on 64-bit CPUs than skein-256.
* shake128:goshake128 -- standardized name; non-standard command
                         Faster than software sha-*. Much faster on hardware.
* shake256:goshake256 -- standardized name; non-standard command
                         Same speed as sha-512 on 64-bit CPUs.
                         Much faster on hardware.
* streebog-256:streebog256sum -- non-standardized name; command is in contrib/
* streebog-512:streebog512sum -- non-standardized name; command is in contrib/
* blake3-256:b3sum -- non-standardized name; additional package in most OSes
                      Fastest parallelizeable software hash

SHA2 and SHA3 (SHAKE*) are USA's NIST standards. Streebog is Russian
Federation's government standard. Skein is SHA3-finalist. BLAKE3 is
reduced round Merklee-tree-based BLAKE2 descendant. BLAKE2 is reduced
round BLAKE, that also was one of SHA3-finalists.

meta4ra is copylefted free software: see the file COPYING for copying
conditions. It should work on all POSIX-compatible systems.