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authorMattias Andrée <maandree@kth.se>2024-09-15 00:47:51 +0200
committerMattias Andrée <maandree@kth.se>2024-09-15 00:47:51 +0200
commitf14ba70de62cbd47e074756b1f1aec1f3b77a02d (patch)
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parentSplit libkeccak.h and fix support for architectures that do not allow misaligned memory (diff)
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Move man pages into man3/ and man7/
Signed-off-by: Mattias Andrée <maandree@kth.se>
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-.TH LIBKECCAK_ZEROCOPY_DIGEST 3 LIBKECCAK
-.SH NAME
-libkeccak_zerocopy_digest - Complete the hashing of a message without copying
-.RB ( ADVANCED )
-.SH SYNOPSIS
-.LP
-.nf
-#include <libkeccak.h>
-
-void libkeccak_zerocopy_digest(struct libkeccak_state *\fIstate\fP, void *\fImsg\fP, size_t \fImsglen\fP,
- size_t \fIbits\fP, const char *\fIsuffix\fP, void *\fIhashsum\fP);
-.fi
-.P
-Link with
-.IR -lkeccak .
-.SH DESCRIPTION
-The
-.BR libkeccak_zerocopy_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_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
-.IR hashsum
-is
-.IR 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
-.BR libkeccak_zerocopy_digest ()
-will write at and beyond
-.IR &msg[msglen] .
-The caller must make sure that enough memory is allocated
-for the
-.I suffix
-as well as padding of at least 2 bits, for
-.IR msg .
-The sum of
-.IR msglen ,
-the bits specified in
-.IR suffix ,
-and the padded, shall, in bytes, be an integer multiple of
-the bitrate divided by eight, which is returned by the
-.BR libkeccak_zerocopy_chunksize (3)
-function.
-.SH RETURN VALUES
-The
-.BR libkeccak_zerocopy_digest ()
-function does not return a value.
-.SH ERRORS
-The
-.BR libkeccak_zerocopy_digest ()
-function cannot fail.
-.SH NOTES
-Calling the
-.BR libkeccak_zerocopy_digest (3)
-function after the
-.BR libkeccak_update (3)
-or
-.BR libkeccak_fast_update (3)
-functions, with the same
-.I state
-argument, may cause the message to be misread.
-.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_zerocopy_digest ()
-functions.
-.SH SEE ALSO
-.BR libkeccak_state_initialise (3),
-.BR libkeccak_cshake_initialise (3),
-.BR libkeccak_zerocopy_chunksize (3),
-.BR libkeccak_fast_update (3),
-.BR libkeccak_zerocopy_update (3),
-.BR libkeccak_update (3),
-.BR libkeccak_cshake_suffix (3),
-.BR libkeccak_digest (3),
-.BR libkeccak_zerocopy_digest (3),
-.BR libkeccak_simple_squeeze (3),
-.BR libkeccak_fast_squeeze (3),
-.BR libkeccak_squeeze (3)