.TH ANYSUM 1 anysum
.SH NAME
anysum - compute or verify against multiple checksums

.SH SYNOPSIS
.B anysum
.RB ( -c
.RB [ -w ]
|
.RB [ -a
.IR algoritms ]\ ...)
.RB [ -W
.IR options ]\ ...
.RB [ -z ]
.RI [ file ]\ ...

.SH DESCRIPTION
The
.B anysum
utility can calculate checksums of a file using
multiple hash functions, or using different parameters for
the function, in parallel (the utility can calculate checksums
for multiple files, but these are not calculated in parallel).
.PP
The
.B anysum
utility can also check a file against multiple
checksums using multiple hash function and hash function
parameters in parallel, and check that the file matches at
least one of the listed checksums.

.SH OPTIONS
The anysum utility conforms to the Base Definitions volume of
POSIX.1-2017,
.IR "Section 12.2" ,
.IR "Utility Syntax Guidelines" .
.PP
The following options are supported:
.TP
.BR -a \ \fIalgorithms\fP
Comma-separated list of hash functions and
parameters to compute checksums with.

Currently supported values are:
.RS
.TP
.B md2
For MD2.
.TP
.B md4
For MD4.
.TP
.B md5
For MD5.
.TP
.BR ripemd128 " or " rmd128
For RIPEMD-128.
.TP
.BR ripemd160 " or " rmd160
For RIPEMD-160.
.TP
.BR ripemd256 " or " rmd256
For RIPEMD-256.
.TP
.BR ripemd320 " or " rmd320
For RIPEMD-320.
.TP
.B sha0
For SHA-0.
.TP
.B sha1
For SHA-1.
.TP
.B sha224
For the 224 bit version of SHA-2.
.TP
.B sha256
For the 256 bit version of SHA-2.
.TP
.B sha384
For the 384 bit version of SHA-2.
.TP
.B sha512
For the 512 bit version of SHA-2.
.TP
.B sha512/224
For the 224 bit output variant of the
512 (and 384) bit version of SHA-2.
.TP
.B sha512/256
For the 256 bit output variant of the
512 (and 384) bit version of SHA-2.
.TP
.BI keccak[r= bitrate ,c= capacity ,n= length ,z= squeezes ]
For Keccak. The brackets and there parameter
list, and each parameter, are optional. Any
parameter the is skipped is automatically
determined.
.I bitrate
and
.I capacity
are the Keccak function's bitrate and
capacity bit bits, and
.I length
is the hash length is bits.
.I squeezes
is the number of squeezes to perform
after a input has been feed into the function;
the default is one, and any number in excess
of this is the number of squeezes to perform
before squeezing out the hash.
.TP
.B keccak-224
For Keccak[r=1152,c=448,n=224].
.TP
.B keccak-256
For Keccak[r=1088,c=512,n=256].
.TP
.B keccak-384
For Keccak[r=832,c=768,n=384].
.TP
.B keccak-512
For Keccak[r=576,c=1024,n=512].
.TP
.B sha3-224
For the 224 bit version of SHA-3.
.TP
.B sha3-256
For the 256 bit version of SHA-3.
.TP
.B sha3-384
For the 384 bit version of SHA-3.
.TP
.B sha3-512
For the 512 bit version of SHA-3.
.TP
.BI shake-128[n= length ]
For the 128 bit version of SHAKE. The brackets and
.BI n= length
are optional;
.I length
shall the output size in bits (default is 128).
.TP
.BI shake-256[n= length ]
For the 256 bit version of SHAKE. The brackets and
.BI n= length
are optional;
.I length
shall the output size in bits (default is 256).
.TP
.BI shake-512[n= length ]
For the 512 bit version of SHAKE. The brackets and
.BI n= length
are optional;
.I length
shall the output size in bits (default is 512).
.TP
.BI rawshake-128[n= length ]
For the 128 bit version of RawSHAKE. The
brackets and
.BI n= length
are optional;
.I length
shall the output size in bits (default is 128).
.TP
.BI rawshake-256[n= length ]
For the 256 bit version of RawSHAKE. The
brackets and
.BI n= length
are optional;
.I length
shall the output size in bits (default is 256).
.TP
.BI rawshake-512[n= length ]
For the 512 bit version of RawSHAKE. The
brackets and
.BI n= length
are optional;
.I length
shall the output size in bits (default is 512).
.TP
.BR blake224[salt= \fIsalt\fP ] " or " b224[salt= \fIsalt\fP ]
For the 224 bit version of BLAKE. The brackets and
.BI salt= salt
are optional;
.I salt
shall be a 32 character long hexadecimal value.
.TP
.BR blake256[salt= \fIsalt\fP ] " or " b256[salt= \fIsalt\fP ]
For the 256 bit version of BLAKE. The brackets and
.BI salt= salt
are optional;
.I salt
shall be a 32 character long hexadecimal value.
.TP
.BR blake384[salt= \fIsalt\fP ] " or " b384[salt= \fIsalt\fP ]
For the 384 bit version of BLAKE. The brackets and
.BI salt= salt
are optional;
.I salt
shall be a 64 character long hexadecimal value.
.TP
.BR blake512[salt= \fIsalt\fP ] " or " b512[salt= \fIsalt\fP ]
For the 512 bit version of BLAKE. The brackets and
.BI salt= salt
are optional;
.I salt
shall be a 64 character long hexadecimal value.
.PP
The utility does also recognise similar values
that are obviously equivalent.
.RE
.TP
.B -b
Read in binary mode when computing hashes.
.TP
.B -c
Verify the the files listed in file against the
checksums listed on the same lines. The file
shall be formatted as the output of the utility
when this option is not used. See the
.B STDOUT
section for more information. If a file is listed
multiple times, it need only match one of the
checksums listed for the file.

The length of the listed checksums need not match
the length output by this utility; before the
checksums are compared, they are truncated to the
shorter of the two checksums.
.TP
.B -t
Read in text mode when computing hashes.
.TP
.BR -W \ \fIoptions\fP
Comma-sepearated list of implementation-specific
options. The following options are supported:
.RS
.TP
.BI output= format
.I format
shall be
.RB \(dq lowercase \(dq
if the checksums shall be printed in lowercase
hexadecimal format (default),
.RB \(dq uppercase \(dq
for uppercase hexadecimal format, or
.RB \(dq binary \(dq
for binary format without anything but the
checksum printed to standard output. This
option is ignored if the
.B -c
option is used.
.TP
.BI input= format
.I format
shall be
.RB \(dq binary \(dq
if the files are be read in binary mode,
.RB \(dq text \(dq
if the files shall be read in text mode, or
.RB \(dq hexadecimal \(dq
they shall be decoded from hexadecimal to
binary. If the
.B -c
option is used, the mode specification
associated with a file is overrides this
behaviour for that file if the line
specifies hexadecimal mode.
.TP
.BI threads= count
The maximum number of threads that the
utility may use. If
.RB \(dq auto \(dq
is specified, the utility selects a default
value, which currently is the number of
online CPU threads (at any time; assumed to
be 8 if it cannot be determined) minus 2,
or 1 if this would be less than 1.
.TP
.B recursive
If a
.I file
operand is a directory, the checksum is computed for
all files recursively. This option is ignored if the
.B -c
option is used.
.TP
.B no-recursive
The utility shall traverse directories.
(This is the default behaviour).
.TP
.B xdev
Implies
.B -W recursive
but also allows the recursion across mountpoints.
.TP
.B no-xdev
Disable recursion across mountpoints.
(This is the default behaviour).
Note that this does not disable
recursion by itself.
.TP
.B xlink
Implies
.B -W recursive
but also allows the recursion across symbolic links.
.TP
.B no-xlink
Disable recursion across symbolic links.
(This is the default behaviour).
Note that this does not disable
recursion by itself.
.RE
.TP
.B -w
Warn about, but skip, lines that are not properly
formatted.
.TP
.B -z
Use NUL byte as line ending instead of LF.
.PP
There is no difference between binary mode and text mode,
so the
.B -b
and
.B -t
options are ignored, except that they undo
.BR "-W input=hexadecimal" .

.SH OPERANDS
The following operand is supported:
.TP
.I file
The file to read and compute the checksum for, or if the
.B -c
option is used, use as the listing of files and checksums
to verify the files against. If dash
.RB (' - ')
is used or if no file operand is specified, standard input
will be used.

.SH STDOUT
If the
.B -c
option is not used, the utility shall print the following
line for each calculated checksum, however there are options
that modify the format; see the
.B OPTIONS
section for more information:
.PP
.RS
.B \(dq%s:%s %c%s\en\(dq,
.RI < "hash function" >\fB,\fP
.RI < hash >\fB,\fP
.RI < mode >\fB,\fP
.RI < file >
.RE
.PP
where
.I mode
is SP (' ') for text mode, an asterisk
.RB (' * ')
for binary mode, or a pound sign
.RB (' # ')
for hexadecimal mode; however if there is no difference
between binary mode and text mode and either is selected,
SP (' ') (text mode) is used.
.PP
If the
.B -c
option the output shall be on the format:
.PP
.RS
.B \(dq%s: %s\en\(dq,
.RI < file >\fB,\fP
.RI < validity >
.RE
.PP
where
.I validity
is an implementation specified string
that describes whether the checksum was valid (possibly
with remarks), the file did not exist, the file could
not be read (possibly with error information), or if
the checksum was invalid or could not be compared
(possibly with remarks). The
.B -z
option does not modify the line ending.

.SH EXIT STATUS
The following exit values are returned:
.TP
0
Successful completion.
.TP
1
Checksums did not match or a file did not exist.
.TP
2
An error occurred.

.SH NOTES
Other implementations do not necessarily recognise the
hexadecimal mode specifier
.RB (' # ')
in checksum list files.
.PP
The
.B -c
option accepting truncated checksums is an
implementation-specific behaviour.

.SH SEE ALSO
.BR md2sum (1),
.BR md4sum (1),
.BR md5sum (1),
.BR rmd128sum (1),
.BR rmd256sum (1),
.BR rmd384sum (1),
.BR rmd512sum (1),
.BR sha0sum (1),
.BR sha1sum (1),
.BR sha224sum (1),
.BR sha256sum (1),
.BR sha384sum (1),
.BR sha512sum (1),
.BR sha512-224sum (1),
.BR sha512-256sum (1),
.BR sha3sum (1),
.BR sha3-224sum (1),
.BR sha3-256sum (1),
.BR sha3-384sum (1),
.BR sha3-512sum (1),
.BR keccaksum (1),
.BR keccak224sum (1),
.BR keccak256sum (1),
.BR keccak384sum (1),
.BR keccak512sum (1),
.BR shake128sum (1),
.BR shake256sum (1),
.BR shake512sum (1),
.BR rawshake128sum (1),
.BR rawshake256sum (1),
.BR rawshake512sum (1),
.BR bsum (1),
.BR b224sum (1),
.BR b256sum (1),
.BR b384sum (1),
.BR b512sum (1)