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B2SUM(1)		    General Commands Manual		      B2SUM(1)

NAME
       b2sum --	generate checksums using the BLAKE2 hash function

SYNOPSIS
       b2sum [-a algorithm] [-l	length]	[--tag]	[file ...]
       b2sum [--help]

DESCRIPTION
       The  b2sum command generates checksums for files	using the BLAKE2 cryp-
       tographic hash function and writes them to standard output.

       When [file ...] is empty	or -, b2sum reads from standard	input.

       -a algorithm  Specify a variant of BLAKE2 to use	when generating	check-
		     sums. The variants	are listed under the  algorithms  sec-
		     tion, and the default is blake2b.

       -l length     Specify the digest	length in bits.	It must	not exceed the
		     maximum for the variant of	BLAKE2 being used, and must be
		     a multiple	of 8.

       --tag	     Prepend  the  checksums with "ALGORITHM-NAME (file) =", a
		     format common on BSD systems.

       --help	     Display usage.

ALGORITHMS
       blake2b	 optimized for 64-bit platforms	and  NEON-enabled  ARMs,  pro-
		 duces digests of any size between 1 and 64 bytes

       blake2s	 optimized  for	8 to 32-bit platforms, produces	digests	of any
		 size between 1	and 32 bytes

       blake2bp	 4-way parallel	BLAKE2b

       blake2sp	 8-way parallel	BLAKE2s

SEE ALSO
       shasum(1)

STANDARDS
       RFC 7693	 The BLAKE2 Cryptographic Hash and Message Authentication Code

AUTHORS
       b2sum is	part of	the BLAKE2 official  implementation.  BLAKE2  was  de-
       signed  by  Jean-Philippe Aumasson, Samuel Neves, Zooko Wilcox-O'Hearn,
       and Christian Winnerlein.

       BLAKE2 is based on the SHA-3  proposal  BLAKE  which  was  designed  by
       Jean-Philippe  Aumasson,	 Luca  Henzen,	Willi Meier, and Raphael C.-W.
       Phan.

       BLAKE2, like BLAKE, relies on the ChaCha20 stream cipher,  designed  by
       Daniel J. Bernstein.

       A mailing list for BLAKE2 can be	subscribed to by sending an empty mes-
       sage to info-subscribe@blake2.net.

       The four	designers of BLAKE2 can	be contacted at	contact@blake2.net.

       This manual page	was written by Scarlett: https://github.com/Scarletts.

FreeBSD	ports 15.0	       February	20, 2016		      B2SUM(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=b2sum&sektion=1&manpath=FreeBSD+Ports+15.0>

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