Move man pages into man3/ and man7/

Signed-off-by: Mattias Andrée <maandree@kth.se>

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-.TH LIBKECCAK_DIGEST 3 LIBKECCAK
-.SH NAME
-libkeccak_digest - Complete the hashing of a message with erasure
-.SH SYNOPSIS
-.nf
-#include <libkeccak.h>
-
-int libkeccak_digest(struct libkeccak_state *\fIstate\fP, const void *\fImsg\fP, size_t \fImsglen\fP,
-                     size_t \fIbits\fP, const char *\fIsuffix\fP, void *\fIhashsum\fP);
-.fi
-.PP
-Link with
-.IR -lkeccak .
-.SH DESCRIPTION
-The
-.BR libkeccak_digest ()
-function absorbs the last part of (or all of) a message,
-and returns the hash of the entire message. The last part
-of the message is specified by the
-.I msg
-parameter, and its byte-size is specified by the
-.I msglen
-parameter. If all of the message has already be processed
-by calls to the
-.BR libkeccak_update (3),
-.BR libkeccak_fast_update (3),
-or
-.BR libkeccak_zerocopy_update (3)
-function (with the same pointer on
-.IR state ,)
-.I msg
-and
-.I msglen
-should be set to
-.I NULL
-and 0, respectively.
-.PP
-If the message is not comprised a whole number of bytes,
-the number of bits, modulus 8, in the message should be
-specified in the
-.I bits
-parameter.
-.I msglen
-must only count the number of whole bytes, that is, the
-floor of the number of bits in the message divided by 8.
-.PP
-.I suffix
-should be a NUL-terminated string of ASCII '1':s
-and '0':s, representing the bits that should be appended to
-the message. If this string is empty,
-.I NULL
-may be used instead. This is used to select hash algorithm.
-For pure Keccak,
-.I NULL
-or \(dq\(dq is used. For the other algorithms the constants
-.B LIBKECCAK_SHA3_SUFFIX
-(for SHA-3),
-.B LIBKECCAK_RAWSHAKE_SUFFIX
-(for RawSHAKE), and
-.B LIBKECCAK_SHAKE_SUFFIX
-(for SHAKE), or the return of the
-.BR libkeccak_cshake_suffix (3)
-function (for cSHAKE), are used.
-.PP
-The hash of the message will be stored to
-.IR hashsum ,
-unless
-.I hashsum
-is
-.I NULL
-(which increases the performance of the call.) A total of
-.RI (( state->n
-+ 7) / 8) bytes will be written to the beginning of
-.IR hashsum .
-Therefore,
-.I hashsum
-needs at least an allocation size of that number of bytes.
-.PP
-The
-.BR libkeccak_digest ()
-function may reallocate the state's message chunk buffer.
-When doing so, it attempts to do so as securely as possible,
-rather than as fast as possible.
-.SH RETURN VALUES
-The
-.BR libkeccak_digest ()
-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_digest ()
-function may fail for any reason specified by the function
-.BR malloc (3).
-.SH EXAMPLE
-This example calculates the Keccak[b = 1024, c = 576, n = 256]
-hash of the input from stdin, and prints the hash, in hexadecimal
-form, to stdout.
-.PP
-.nf
-struct libkeccak_state state;
-struct libkeccak_spec spec;
-char binhash[256 / 8];
-char hexhash[256 / 8 * 2 + 1];
-char chunk[4 << 10];
-ssize_t len;
-
-spec.bitrate = 1024;
-spec.capacity = 576;
-spec.output = 256;
-if (libkeccak_state_initialise(&state, &spec) < 0)
-	goto fail;
-
-for (;;) {
-	len = read(STDIN_FILENO, chunk, sizeof(chunk));
-
-	if ((len < 0) && (errno == EINTR))
-		continue;
-	if (len < 0)
-		goto fail;
-	if (len == 0)
-		break;
-
-	if (libkeccak_update(&state, chunk, (size_t)len) < 0)
-		goto fail;
-}
-if (libkeccak_digest(&state, NULL, 0, 0, \(dq\(dq, binhash) < 0)
-	goto fail;
-
-libkeccak_behex_lower(hexhash, binhash, sizeof(binhash));
-printf(\(dq%s\en\(dq, hexhash);
-libkeccak_state_destroy(&state);
-.fi
-.SH NOTES
-For cSHAKE, the
-.BR libkeccak_cshake_initialise (3),
-must be called, once, immediately after
-state initialisation; before the first
-call to any of the
-.BR libkeccak_fast_update (),
-.BR libkeccak_zerocopy_update (),
-.BR libkeccak_update (),
-and
-.BR libkeccak_digest ()
-functions.
-.SH SEE ALSO
-.BR libkeccak_state_initialise (3),
-.BR libkeccak_cshake_initialise (3),
-.BR libkeccak_fast_update (3),
-.BR libkeccak_update (3),
-.BR libkeccak_cshake_suffix (3),
-.BR libkeccak_fast_digest (3),
-.BR libkeccak_zerocopy_digest (3),
-.BR libkeccak_simple_squeeze (3),
-.BR libkeccak_fast_squeeze (3),
-.BR libkeccak_squeeze (3)