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• NAME
• SYNOPSIS
• DESCRIPTION
• AUTHOR
• SEE ALSO

NAME

shasum - Print or Check SHA Checksums

SYNOPSIS

 Usage: shasum [OPTION]... [FILE]...
 
 Print or check SHA checksums.
 
 With no FILE, or when FILE is -, read standard input.
 
 
   -a, --algorithm   1 (default), 224, 256, 384, 512, 512224, 512256
 
   -b, --binary  read in binary mode
 
   -c, --check   read SHA sums from the FILEs and check them
 
   -t, --text read in text mode (default)
 
   -p, --portable read in portable mode
 
 produces same digest on Windows/Unix/Mac
 
   -0, --01  read in BITS mode
 
 ASCII '0' interpreted as 0-bit,
 
 ASCII '1' interpreted as 1-bit,
 
 all other characters ignored
 
 
 The following two options are useful only when verifying checksums:
 
   -s, --status  don't output anything, status code shows success
 
   -w, --warn warn about improperly formatted checksum lines
 
 
   -h, --help display this help and exit
 
   -v, --version output version information and exit
 
 
 When verifying SHA-512/224 or SHA-512/256 checksums, indicate the
 
 algorithm explicitly using the -a option, e.g.
 
 
   shasum -a 512224 -c checksumfile
 
 
 The sums are computed as described in FIPS-180-4.  When checking, the
 
 input should be a former output of this program.  The default mode is to
 
 print a line with checksum, a character indicating type (`*' for binary,
 
  ` ' for text, `?' for portable, `^' for BITS), and name for each FILE.
 
 
  Report shasum bugs to [email protected]
 

DESCRIPTION

Running shasum is often the quickest way to compute SHA messagedigests. The user simply feeds data to the script through files orstandard input, and then collects the results from standard output.

The following command shows how to compute digests for typical inputssuch as the NIST test vector "abc":

perl -e "print qq(abc)" | shasum
 

Or, if you want to use SHA-256 instead of the default SHA-1, simply say:

perl -e "print qq(abc)" | shasum -a 256
 

Since shasum mimics the behavior of the combined GNU sha1sum,sha224sum, sha256sum, sha384sum, and sha512sum programs,you can install this script as a convenient drop-in replacement.

Unlike the GNU programs, shasum encompasses the full SHA standard byallowing partial-byte inputs. This is accomplished through the BITSoption (-0). The following example computes the SHA-224 digest ofthe 7-bit message 0001100:

perl -e "print qq(0001100)" | shasum -0 -a 224
 

AUTHOR

Copyright (c) 2003-2012 Mark Shelor <[email protected]>.

SEE ALSO

shasum is implemented using the Perl module Digest::SHA orDigest::SHA::PurePerl.