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-.TH LIBKECCAK_SHAKESUM_FD 3 LIBKECCAK
-.SH NAME
-libkeccak_shakesum_fd - Calculate a SHAKE hashsum of a file
-.SH SYNOPSIS
-.nf
-#include <libkeccak.h>
-
-int libkeccak_shakesum_fd(int \fIfd\fP, struct libkeccak_state *\fIstate\fP, long int \fIsemicapacity\fP, long int \fIoutput\fP, void *\fIhashsum\fP);
-.fi
-.PP
-Link with
-.IR -lkeccak .
-.SH DESCRIPTION
-The
-.BR libkeccak_shakesum_fd ()
-function calculates a SHAKE hashsum of a file, whose file
-desriptor is specified by
-.I fd
-(and should be at the beginning of the file.) The hash
-algorithm is tuned by the
-.I semicapacity
-and
-.I output
-parameters; they specify the half of the capacity and the
-output size, respectively, in bits.
-.PP
-The hash is stored in binary form to
-.IR hashsum .
-.I hashsum
-should have an allocation size of at least
-.RI ((( output
-+ 7) / 8) * sizeof(char)).
-.PP
-.I *state
-should not be initialised.
-.BR libkeccak_shakesum_fd ()
-initialises
-.I *state
-itself. Therefore there would be a memory leak if
-.I *state
-is already initialised.
-.SH RETURN VALUES
-The
-.BR libkeccak_shakesum_fd ()
-function returns 0 upon successful completion.
-On error, -1 is returned and
-.I errno
-is set to describe the error.
-.SH ERRORS
-The
-.BR libkeccak_shakesum_fd ()
-function may fail for any reason, except those resulting in
-.I errno
-being set to
-.BR EINTR ,
-specified for the functions
-.BR read (2),
-.BR malloc (3),
-and
-.BR realloc (3).
-.SH NOTES
-Be aware,
-.BR libkeccak_shakesum_fd ()
-hashes the file until the end has been reached. For pipes
-and sockets and this means until the file has been closed.
-But for character devices, this usually means never.
-Attempting to hash files in /dev is therefore usually a
-bad idea.
-.BR libkeccak_shakesum_fd ()
-does not check for the file length or file type before
-hashing as this could limit what you can do, and make
-the library more complex.
-.PP
-.BR libkeccak_shakesum_fd ()
-does not stop if interrupted
-.RB ( read (2)
-returns
-.BR EINTR .)
-.PP
-.BR libkeccak_shakesum_fd ()
-assumes all information is non-sensitive, and will
-therefore not perform any secure erasure of information.
-.PP
-.BR libkeccak_shakesum_fd ()
-does not validate the tuning of the algorithm.
-.SH EXAMPLE
-This example calculates the SHAKE256(, 512) hash of the input
-from stdin, and prints the hash, in hexadecimal form, to stdout.
-.LP
-.nf
-struct libkeccak_state state;
-if (libkeccak_shakesum_fd(STDIN_FILENO, &state, 256, 512, binhash) < 0)
-	goto fail;
-libkeccak_behex_lower(hexhash, binhash, sizeof(binhash));
-printf(\(dq%s\en\(dq, hexhash);
-libkeccak_state_destroy(&state);
-.fi
-.SH SEE ALSO
-.BR libkeccak_behex_lower (3),
-.BR libkeccak_behex_upper (3),
-.BR libkeccak_generalised_sum_fd (3),
-.BR libkeccak_keccaksum_fd (3),
-.BR libkeccak_sha3sum_fd (3),
-.BR libkeccak_rawshakesum_fd (3),
-.BR libkeccak_spec_shake (3),
-.BR libkeccak_spec_check (3),
-.BR libkeccak_generalised_spec_initialise (3),
-.BR libkeccak_state_initialise (3)