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authorMattias Andrée <maandree@kth.se>2019-02-11 16:22:00 +0100
committerMattias Andrée <maandree@kth.se>2019-02-11 16:22:00 +0100
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Split most .c files into one per function and flatten file hierarchy
Signed-off-by: Mattias Andrée <maandree@kth.se>
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-.TH LIBKECCAK_HMAC_FAST_DIGEST 3 LIBKECCAK
-.SH NAME
-libkeccak_hmac_fast_digest - Complete the HMAC-hashing of a message without erasure
-.SH SYNOPSIS
-.nf
-#include <libkeccak.h>
-
-int libkeccak_hmac_fast_digest(libkeccak_hmac_state_t *\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_hmac_fast_digest ()
-function absorbes the last part of (or all of) a message,
-and returns the HMAC 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_hmac_update (3)
-function or the
-.BR libkeccak_hmac_fast_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) 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_hmac_fast_digest ()
-function may reallocate the state's message chunk buffer.
-When doing so, it attempts to do so as quickly as possible,
-rather than ensuring that the information in the old
-allocation is securely removed if a new allocation is required.
-.SH RETURN VALUES
-The
-.BR libkeccak_hmac_fast_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_hmac_fast_digest ()
-function may fail for any reason specified by the function
-.BR realloc (3).
-.SH SEE ALSO
-.BR libkeccak_hmac_create (3),
-.BR libkeccak_hmac_initialise (3),
-.BR libkeccak_hmac_fast_update (3),
-.BR libkeccak_hmac_fast_digest (3)