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.\"
.IX Title "SHASUM 1"
.TH SHASUM 1 "2016-07-28" "perl v5.16.3" "User Contributed Perl Documentation"
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.SH "NAME"
shasum \- Print or Check SHA Checksums
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\& 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)
\&   \-U, \-\-UNIVERSAL   read in Universal Newlines mode
\&                         produces same digest on Windows/Unix/Mac
\&   \-0, \-\-01          read in BITS mode
\&                         ASCII \*(Aq0\*(Aq interpreted as 0\-bit,
\&                         ASCII \*(Aq1\*(Aq interpreted as 1\-bit,
\&                         all other characters ignored
\&   \-p, \-\-portable    read in portable mode (to be deprecated)
\&
\& The following two options are useful only when verifying checksums:
\&   \-s, \-\-status      don\*(Aqt 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 PUB 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
\& (\`*\*(Aq for binary, \` \*(Aq for text, \`U\*(Aq for UNIVERSAL, \`^\*(Aq for BITS, \`?\*(Aq
\& for portable), and name for each FILE.
\&
\& Report shasum bugs to mshelor@cpan.org
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Running \fIshasum\fR is often the quickest way to compute \s-1SHA\s0 message
digests.  The user simply feeds data to the script through files or
standard input, and then collects the results from standard output.
.PP
The following command shows how to compute digests for typical inputs
such as the \s-1NIST\s0 test vector \*(L"abc\*(R":
.PP
.Vb 1
\&        perl \-e "print qq(abc)" | shasum
.Ve
.PP
Or, if you want to use \s-1SHA\-256\s0 instead of the default \s-1SHA\-1,\s0 simply say:
.PP
.Vb 1
\&        perl \-e "print qq(abc)" | shasum \-a 256
.Ve
.PP
Since \fIshasum\fR mimics the behavior of the combined \s-1GNU \s0\fIsha1sum\fR,
\&\fIsha224sum\fR, \fIsha256sum\fR, \fIsha384sum\fR, and \fIsha512sum\fR programs,
you can install this script as a convenient drop-in replacement.
.PP
Unlike the \s-1GNU\s0 programs, \fIshasum\fR encompasses the full \s-1SHA\s0 standard by
allowing partial-byte inputs.  This is accomplished through the \s-1BITS\s0
option (\fI\-0\fR).  The following example computes the \s-1SHA\-224\s0 digest of
the 7\-bit message \fI0001100\fR:
.PP
.Vb 1
\&        perl \-e "print qq(0001100)" | shasum \-0 \-a 224
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Copyright (c) 2003\-2016 Mark Shelor <mshelor@cpan.org>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIshasum\fR is implemented using the Perl module Digest::SHA or
Digest::SHA::PurePerl.