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-.TH LIBKECCAK_FAST_UPDATE 3 LIBKECCAK
-.SH NAME
-libkeccak_fast_update - Partially hash a message without erasure
-.SH SYNOPSIS
-.LP
-.nf
-#include <libkeccak.h>
-.P
-int
-libkeccak_fast_update(libkeccak_state_t *\fIstate\fP, const char *\fImsg\fP,
- size_t \fImsglen\fP);
-.fi
-.P
-Link with
-.IR -lkeccak .
-.SH DESCRIPTION
-The
-.BR libkeccak_fast_update ()
-function continues (or starts) hashing a message.
-The current state of the hashing is stored in
-.IR *state ,
-and will be updated. The message specified by the
-.I msg
-parameter with the byte-size specified by the
-.I msglen
-parameter, will be hashed.
-.PP
-The
-.BR libkeccak_fast_update ()
-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_fast_update ()
-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_fast_update ()
-function may fail for any reason specified by the function
-.BR realloc (3).
-.SH NOTES
-Neither parameter by be
-.I NULL
-or 0.
-.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.
-.LP
-.nf
-libkeccak_state_t state;
-libkeccak_spec_t 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_fast_update(&state, chunk, (size_t)len) < 0)
- goto fail;
-}
-if (libkeccak_fast_digest(&state, NULL, 0, 0, "", binhash) < 0)
- goto fail;
-
-libkeccak_behex_lower(hexhash, binhash, sizeof(binhash));
-printf("%s\\n", hexhash);
-libkeccak_state_fast_destroy(&state);
-.fi
-.SH SEE ALSO
-.BR libkeccak_state_initialise (3),
-.BR libkeccak_update (3),
-.BR libkeccak_fast_digest (3),
-.BR libkeccak_digest (3)
-.SH BUGS
-Please report bugs to https://github.com/maandree/libkeccak/issues or to
-maandree@kth.se