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+.\"	$OpenBSD: SipHash24_Init.3,v 1.1 2019/08/30 22:20:43 deraadt Exp $
+.\"
+.\" Copyright (c) 2014 David Gwynne <dlg@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: August 30 2019 $
+.Dt SIPHASH24 3
+.Os
+.Sh NAME
+.Nm SipHash24_Init ,
+.Nm SipHash24_Update ,
+.Nm SipHash24_End ,
+.Nm SipHash24_Final ,
+.Nm SipHash24
+.Nd calculate SipHash24 hashes
+.Sh SYNOPSIS
+.In siphash.h
+.Ft void
+.Fn SipHash24_Init "SIPHASH_CTX *ctx" "const SIPHASH_KEY *key"
+.Ft void
+.Fn SipHash24_Update "SIPHASH_CTX *ctx" "const void *data" "size_t len"
+.Ft uint64_t
+.Fn SipHash24_End "SIPHASH_CTX *ctx"
+.Ft void
+.Fn SipHash24_Final "void *digest" "SIPHASH_CTX *ctx"
+.Ft uint64_t
+.Fn SipHash24 "const SIPHASH_KEY *key" "const void *data" "size_t len"
+.Sh DESCRIPTION
+The SipHash algorithm is a keyed hash algorithm optimised for short
+inputs which produces a 64-bit digest of data.
+The SipHash24 functions implement the algorithm with 2 compression
+rounds and 4 finalisation rounds.
+.Pp
+.Fn SipHash24_Init
+initialises a
+.Vt SIPHASH_CTX
+context
+.Fa ctx
+with the secret
+.Fa key .
+.Pp
+.Fn SipHash24_Update
+adds
+.Fa data
+of length
+.Fa len
+to the context
+.Fa ctx .
+.Pp
+.Fn SipHash24_End
+is called after all data has been added to
+.Fa ctx
+via
+.Fn SipHash24_Update
+and returns a message digest in the host's native endian.
+.Pp
+.Fn SipHash24_Final
+is called after all data has been added to
+.Fa ctx
+via
+.Fn SipHash24_Update
+and stores the message digest at the address specified by the
+.Fa digest
+parameter.
+The buffer at
+.Fa digest
+must be
+.Dv SIPHASH_DIGEST_LENGTH
+bytes long.
+.Pp
+.Fn SipHash24
+calculates the digest of
+.Fa data
+of length
+.Fa len
+with the secret
+.Fa key .
+.Pp
+It is recommended that the
+.Vt SIPHASH_KEY
+key be generated with
+.Xr arc4random_buf 3 .
+.Sh RETURN VALUES
+.Fn SipHash24_End
+and
+.Fn SipHash24
+return the 64-bit message digest in the host's native endian representation.
+.Sh SEE ALSO
+.Xr arc4random_buf 3
+.Sh HISTORY
+These functions appeared in
+.Ox 5.7 .