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-.\" $OpenBSD: HMAC.3,v 1.23 2024/08/29 20:21:53 tb Exp $
-.\" full merge up to: OpenSSL crypto/hmac a528d4f0 Oct 27 13:40:11 2015 -0400
-.\" selective merge up to: OpenSSL man3/HMAC b3696a55 Sep 2 09:35:50 2017 -0400
-.\"
-.\" This file was written by Ulf Moeller <ulf@openssl.org>,
-.\" Richard Levitte <levitte@openssl.org>, and
-.\" Matt Caswell <matt@openssl.org>.
-.\" Copyright (c) 2000-2002, 2006, 2008, 2009, 2013, 2015, 2016
-.\" The OpenSSL Project.  All rights reserved.
-.\"
-.\" 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.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED 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 OpenSSL PROJECT OR
-.\" ITS 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 $Mdocdate: August 29 2024 $
-.Dt HMAC 3
-.Os
-.Sh NAME
-.Nm HMAC ,
-.Nm HMAC_CTX_new ,
-.Nm HMAC_CTX_reset ,
-.Nm HMAC_CTX_free ,
-.Nm HMAC_Init_ex ,
-.Nm HMAC_Update ,
-.Nm HMAC_Final ,
-.Nm HMAC_CTX_copy ,
-.Nm HMAC_CTX_set_flags ,
-.Nm HMAC_CTX_get_md ,
-.Nm HMAC_size
-.Nd HMAC message authentication code
-.Sh SYNOPSIS
-.In openssl/hmac.h
-.Ft unsigned char *
-.Fo HMAC
-.Fa "const EVP_MD *evp_md"
-.Fa "const void *key"
-.Fa "int key_len"
-.Fa "const unsigned char *d"
-.Fa "size_t n"
-.Fa "unsigned char *md"
-.Fa "unsigned int *md_len"
-.Fc
-.Ft HMAC_CTX *
-.Fn HMAC_CTX_new void
-.Ft int
-.Fo HMAC_CTX_reset
-.Fa "HMAC_CTX *ctx"
-.Fc
-.Ft void
-.Fo HMAC_CTX_free
-.Fa "HMAC_CTX *ctx"
-.Fc
-.Ft int
-.Fo HMAC_Init_ex
-.Fa "HMAC_CTX *ctx"
-.Fa "const void *key"
-.Fa "int key_len"
-.Fa "const EVP_MD *md"
-.Fa "ENGINE *engine"
-.Fc
-.Ft int
-.Fo HMAC_Update
-.Fa "HMAC_CTX *ctx"
-.Fa "const unsigned char *data"
-.Fa "size_t len"
-.Fc
-.Ft int
-.Fo HMAC_Final
-.Fa "HMAC_CTX *ctx"
-.Fa "unsigned char *md"
-.Fa "unsigned int *len"
-.Fc
-.Ft int
-.Fo HMAC_CTX_copy
-.Fa "HMAC_CTX *dctx"
-.Fa "HMAC_CTX *sctx"
-.Fc
-.Ft void
-.Fo HMAC_CTX_set_flags
-.Fa "HMAC_CTX *ctx"
-.Fa "unsigned long flags"
-.Fc
-.Ft const EVP_MD *
-.Fo HMAC_CTX_get_md
-.Fa "const HMAC_CTX *ctx"
-.Fc
-.Ft size_t
-.Fo HMAC_size
-.Fa "const HMAC_CTX *e"
-.Fc
-.Sh DESCRIPTION
-HMAC is a MAC (message authentication code), i.e. a keyed hash
-function used for message authentication, which is based on a hash
-function.
-.Pp
-.Fn HMAC
-computes the message authentication code of the
-.Fa n
-bytes at
-.Fa d
-using the hash function
-.Fa evp_md
-and the key
-.Fa key
-which is
-.Fa key_len
-bytes long.
-.Pp
-It places the result in
-.Fa md ,
-which must have space for the output of the hash function, which is no
-more than
-.Dv EVP_MAX_MD_SIZE
-bytes.
-The size of the output is placed in
-.Fa md_len ,
-unless it is
-.Dv NULL .
-.Pp
-.Fa evp_md
-can be
-.Xr EVP_sha1 3 ,
-.Xr EVP_ripemd160 3 ,
-etc.
-.Pp
-.Fn HMAC_CTX_new
-allocates and initializes a new
-.Vt HMAC_CTX
-object.
-.Pp
-.Fn HMAC_CTX_reset
-zeroes and re-initializes
-.Fa ctx
-and associated resources, making it suitable for new computations
-as if it was deleted with
-.Fn HMAC_CTX_free
-and newly created with
-.Fn HMAC_CTX_new .
-.Pp
-.Fn HMAC_CTX_free
-erases the key and other data from
-.Fa ctx ,
-releases any associated resources, and finally frees
-.Fa ctx
-itself.
-.Pp
-The following functions may be used if the message is not completely
-stored in memory:
-.Pp
-.Fn HMAC_Init_ex
-sets up or reuses
-.Fa ctx
-to use the hash function
-.Fa evp_md
-and the key
-.Fa key .
-Either can be
-.Dv NULL ,
-in which case the existing one is reused.
-The
-.Fa ctx
-must have been created with
-.Fn HMAC_CTX_new
-before the first use in this function.
-If
-.Fn HMAC_Init_ex
-is called with a
-.Dv NULL
-.Fa key
-but
-.Fa evp_md
-is neither
-.Dv NULL
-nor the same as the previous digest used by
-.Fa ctx ,
-then an error is returned because reuse of an existing key with a
-different digest is not supported.
-The
-.Fa ENGINE *engine
-argument is always ignored and passing
-.Dv NULL
-is recommended.
-.Pp
-.Fn HMAC_Update
-can be called repeatedly with chunks of the message to be authenticated
-.Pq Fa len No bytes at Fa data .
-.Pp
-.Fn HMAC_Final
-places the message authentication code in
-.Fa md ,
-which must have space for the hash function output.
-.Pp
-.Fn HMAC_CTX_copy
-copies all of the internal state from
-.Fa sctx
-into
-.Fa dctx .
-.Pp
-.Fn HMAC_CTX_set_flags
-applies the specified flags to the internal
-.Vt EVP_MD_CTX
-objects.
-Possible flag values
-.Dv EVP_MD_CTX_FLAG_*
-are defined in
-.In openssl/evp.h .
-.Pp
-.Fn HMAC_size
-returns the length in bytes of the underlying hash function output.
-It is implemented as a macro.
-.Sh RETURN VALUES
-.Fn HMAC
-returns a pointer to the message authentication code or
-.Dv NULL
-if an error occurred.
-.Pp
-.Fn HMAC_CTX_new
-returns a pointer to the new
-.Vt HMAC_CTX
-object or
-.Dv NULL
-if an error occurred.
-.Pp
-.Fn HMAC_CTX_reset ,
-.Fn HMAC_Init_ex ,
-.Fn HMAC_Update ,
-.Fn HMAC_Final ,
-and
-.Fn HMAC_CTX_copy
-return 1 for success or 0 if an error occurred.
-.Pp
-.Fn HMAC_CTX_get_md
-returns the message digest that was previously set for
-.Fa ctx
-with
-.Fn HMAC_Init_ex ,
-or
-.Dv NULL
-if none was set.
-.Pp
-.Fn HMAC_size
-returns the length in bytes of the underlying hash function output
-or 0 on error.
-.Sh SEE ALSO
-.Xr CMAC_Init 3 ,
-.Xr EVP_DigestInit 3
-.Sh STANDARDS
-RFC 2104
-.Sh HISTORY
-.Fn HMAC ,
-.Fn HMAC_Update ,
-.Fn HMAC_Final ,
-and
-.Fn HMAC_size
-first appeared in SSLeay 0.9.0 and have been available since
-.Ox 2.4 .
-.Pp
-.Fn HMAC_Init_ex
-first appeared in OpenSSL 0.9.7 and have been available since
-.Ox 3.2 .
-.Pp
-.Fn HMAC_CTX_set_flags
-first appeared in OpenSSL 0.9.7f and have been available since
-.Ox 3.8 .
-.Pp
-.Fn HMAC_CTX_copy
-first appeared in OpenSSL 1.0.0 and has been available since
-.Ox 4.9 .
-.Pp
-.Fn HMAC_CTX_new ,
-.Fn HMAC_CTX_reset ,
-.Fn HMAC_CTX_free ,
-and
-.Fn HMAC_CTX_get_md
-first appeared in OpenSSL 1.1.0 and have been available since
-.Ox 6.3 .
-.Sh CAVEATS
-Other implementations allow
-.Fa md
-in
-.Fn HMAC
-to be
-.Dv NULL
-and return a static array, which is not thread safe.