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-.TH LIBKECCAK_DEGENERALISE_SPEC 3 LIBKECCAK
-.SH NAME
-libkeccak_degeneralise_spec - Set all specification parameters to automatic
-.SH SYNOPSIS
-.LP
-.nf
-#include <libkeccak.h>
-.P
-int
-libkeccak_degeneralise_spec(libkeccak_generalised_spec_t *\fIspec\fP,
- libkeccak_spec_t *\fIoutput_spec\fP);
-.fi
-.P
-Link with
-.IR -lkeccak .
-.SH DESCRIPTION
-The
-.BR libkeccak_degeneralise_spec ()
-function will resolve automatic parameters in
-.I *spec
-and translates the parameters to
-.IR *output_spec ,
-so that it can be used for hashing.
-.PP
-The function will modify both
-.I *spec
-and
-.IR *output_spec .
-.PP
-You should call the
-.BR libkeccak_spec_check (3)
-function after calling
-.BR libkeccak_degeneralise_spec ().
-.PP
-.nf
-typedef struct libkeccak_generalised_spec {
- long int bitrate; /* bitrate (in bits) */
- long int capacity; /* capacity (in bits) */
- long int output; /* output size (in bits) */
- long int state_size; /* state size (in bits) */
- long int word_size; /* word size (in bits) */
-} libkeccak_generalised_spec_t;
-.fi
-.SH RETURN VALUES
-The
-.BR libkeccak_degeneralise_spec ()
-function returns 0 if the settings are usable. Otherwise
-it will return one of the following constants.
-.PP
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_NONPOSITIVE
-The specified state size is non-positive.
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_TOO_LARGE
-The specified state size exceeded the supported limit
-(currently at 1600 bits.)
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_MOD_25
-The specified state size, in bits, was not equivalent
-to 0 modulus 25. Meaning the state size cannot
-cover all lanes equivalently.
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_WORD_NONPOSITIVE
-The specified word size is non-positive.
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_WORD_TOO_LARGE
-The specified word size exceeded the supported limit
-(currently at 64 bits.)
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_WORD_INCOHERENCY
-The specified state size is not exactly 25 times larger
-than the word size.
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_CAPACITY_NONPOSITIVE
-The specified capacity was non-positive.
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_CAPACITY_MOD_8
-The specified capacity was not equivalent to 0
-modulus 8, that is, it was not in whole bytes.
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_BITRATE_NONPOSITIVE
-The specified bitrate was non-positive.
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_BITRATE_MOD_8
-The specified bitrate was not equivalent to 0
-modulus 8, that is, it was not in whole bytes.
-.TP
-.B LIBKECCAK_GENERALISED_SPEC_ERROR_OUTPUT_NONPOSITIVE
-The specified output size was non-positive.
-.PP
-Note that there may be more than one error. Only the first
-detected is returned.
-.SH ERRORS
-The
-.BR libkeccak_degeneralise_spec ()
-function cannot fail.
-.fi
-.SH EXAMPLE
-This examples configure a
-.B libkeccak_spec_t
-to specify settings for Keccak[c = 512]:
-.LP
-.nf
-int r;
-libkeccak_spec_t spec;
-libkeccak_generalised_spec_t gspec;
-libkeccak_generalised_spec_initialise(&gspec);
-gspec.capacity = 512;
-if ((r = libkeccak_degeneralise_spec(&gspec, &spec)))
- goto fail_degeneralise_spec;
-if ((r = libkeccak_spec_check(&spec)));
- goto fail_spec_check;
-.fi
-.SH SEE ALSO
-.BR libkeccak_generalised_spec_initialise (3),
-.BR libkeccak_spec_check (3),
-.BR libkeccak_spec_sha3 (3),
-.BR libkeccak_spec_rawshake (3),
-.BR libkeccak_spec_shake (3),
-.BR libkeccak_state_initialise (3),
-.BR libkeccak_hmac_initialise (3)
-.SH BUGS
-Please report bugs to https://github.com/maandree/libkeccak/issues or to
-maandree@kth.se