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+.\" $NetBSD: hmac.3,v 1.6 2018/05/23 02:08:40 christos Exp $
+.\"
+.\" Copyright (c) 2016 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Christos Zoulas.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\"TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd May 22, 2018
+.Dt HMAC 3
+.Os
+.Sh NAME
+.Nm hmac
+.Nd compute a key-Hash Message Authentication Code
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft ssize_t
+.Fn hmac "const char *hname" "const void *key" "size_t klen" "const void *text" "size_t tlen" "void *digest" "size_t dlen"
+.Sh DESCRIPTION
+The
+.Fn hmac
+function computes the key-Hash Message Authentication Code per
+.Tn RFC 2104
+and places the result in
+.Fa digest
+writing up to
+.Fa dlen
+bytes.
+The actual number of bytes that would be written is returned.
+.Pp
+The hash functions supported are: md2, md4, md5, rmd160, sha1, sha224,
+sha256, sha384, and sha512.
+.Sh RETURN VALUES
+The
+.Fn hmac
+function returns
+.Dv \-1
+if the
+.Fa hname
+is not found.
+Otherwise the actual length of the digest string is returned (which could
+be bigger or smaller than
+.Fa dlen ) .
+This length depends on the hashing function selected.
+.Sh SEE ALSO
+.Xr md2 3 ,
+.Xr md4 3 ,
+.Xr md5 3 ,
+.Xr openssl_HMAC 3 ,
+.Xr openssl_MD2 3 ,
+.Xr openssl_MD4 3 ,
+.Xr openssl_MD5 3 ,
+.Xr rmd160 3 ,
+.Xr sha1 3 ,
+.Xr sha2 3
+.Sh STANDARDS
+.Rs
+.%R RFC 2104
+.Re
+.Sh NOTES
+The maximum digest length has been extended from
+.Dv 64
+to
+.Dv 128
+bytes to handle SHA2.
+.Sh HISTORY
+The
+.Fn hmac
+function appeared in
+.Nx 8 .