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.IX Title "Crypt::Digest::TurboSHAKE 3"
.TH Crypt::Digest::TurboSHAKE 3 2026-05-12 "perl v5.42.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH NAME
Crypt::Digest::TurboSHAKE \- XOF (extendable output) hash functions TurboSHAKE128 and TurboSHAKE256
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&   use Crypt::Digest::TurboSHAKE;
\&
\&   my $d = Crypt::Digest::TurboSHAKE\->new(128); # TurboSHAKE128
\&   $d\->add(\*(Aqany data\*(Aq);
\&   my $result = $d\->done(32);                   # 32 bytes of output
\&
\&   # or absorb input from a file instead
\&   my $file_d = Crypt::Digest::TurboSHAKE\->new(128);
\&   $file_d\->addfile(\*(Aqfilename.dat\*(Aq);
\&   my $file_result = $file_d\->done(32);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fISince: CryptX\-0.089\fR
.PP
Provides an interface to TurboSHAKE128 and TurboSHAKE256 as defined in
RFC 9861 <https://www.rfc-editor.org/rfc/rfc9861>.
.PP
TurboSHAKE is a faster variant of SHAKE based on the reduced\-round KeccakP\-1600
permutation. Like SHAKE, it is an XOF (extendable output function): \f(CWdone()\fR
can be called multiple times to stream arbitrary amounts of output.
.PP
After the first \f(CWdone()\fR, treat the object as being in output mode:
do not call \f(CWadd()\fR again on that state. Use \f(CWreset()\fR or a new object
to start hashing a new message.
.SH METHODS
.IX Header "METHODS"
Unless noted otherwise, assume \f(CW$d\fR is an existing TurboSHAKE object created
via \f(CW\*(C`new\*(C'\fR, for example:
.PP
.Vb 1
\& my $d = Crypt::Digest::TurboSHAKE\->new(128);
.Ve
.SS new
.IX Subsection "new"
.Vb 2
\& my $d = Crypt::Digest::TurboSHAKE\->new($num);
\& # $num ... [integer] 128 or 256 (selects TurboSHAKE128 or TurboSHAKE256)
.Ve
.SS clone
.IX Subsection "clone"
.Vb 1
\& my $d2 = $d\->clone;
.Ve
.SS reset
.IX Subsection "reset"
.Vb 1
\& $d\->reset;
.Ve
.SS add
.IX Subsection "add"
Appends data to the message. Returns the object itself (for chaining).
.PP
Each argument is converted to bytes using Perl\*(Aqs usual scalar stringification.
Defined scalars, including numbers and string\-overloaded objects, are
accepted. \f(CW\*(C`undef\*(C'\fR is treated as an empty string and may emit Perl\*(Aqs usual
"uninitialized value" warning.
.PP
.Vb 3
\& $d\->add(\*(Aqany data\*(Aq);
\& #or
\& $d\->add(\*(Aqany data\*(Aq, \*(Aqmore data\*(Aq, \*(Aqeven more data\*(Aq);
.Ve
.SS addfile
.IX Subsection "addfile"
Reads the file content and appends it to the message. Returns the object itself (for chaining).
.PP
.Vb 4
\& $d\->addfile(\*(Aqfilename.dat\*(Aq);
\& #or
\& my $filehandle = ...; # existing binary\-mode filehandle
\& $d\->addfile($filehandle);
.Ve
.SS done
.IX Subsection "done"
Returns \f(CW$len\fR bytes of output as a binary string. Can be called repeatedly
to stream an unlimited amount of output from the same absorbed input. The
\&\f(CW$len\fR argument is required and must be a positive integer. Single
\&\f(CWdone()\fR calls are limited to 1,000,000,000 bytes, but the recommended way
to read large output is to call \f(CWdone()\fR repeatedly in 10 MB chunks.
.PP
After the first \f(CWdone()\fR call the object is in output mode. Calling
\&\f(CWadd()\fR in this state croaks; use \f(CWreset()\fR or create a new object to hash
a different message.
.PP
.Vb 3
\& my $result_raw = $d\->done($len);
\& # can be called multiple times; $len is the number of output bytes to read
\& # after the first done(), add() croaks until you call reset()
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.IP \(bu 4
CryptX, Crypt::Digest::SHAKE, Crypt::Digest::KangarooTwelve
.IP \(bu 4
RFC 9861 <https://www.rfc-editor.org/rfc/rfc9861>