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-.\" $OpenBSD: CMAC_Init.3,v 1.9 2024/11/12 00:42:28 schwarze Exp $
-.\"
-.\" Copyright (c) 2020 Ingo Schwarze <schwarze@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: November 12 2024 $
-.Dt CMAC_INIT 3
-.Os
-.Sh NAME
-.Nm CMAC_CTX_new ,
-.Nm CMAC_Init ,
-.Nm CMAC_Update ,
-.Nm CMAC_Final ,
-.Nm CMAC_CTX_copy ,
-.Nm CMAC_CTX_get0_cipher_ctx ,
-.Nm CMAC_CTX_cleanup ,
-.Nm CMAC_CTX_free
-.Nd Cipher-based message authentication code
-.Sh SYNOPSIS
-.In openssl/cmac.h
-.Ft CMAC_CTX *
-.Fn CMAC_CTX_new void
-.Ft int
-.Fo CMAC_Init
-.Fa "CMAC_CTX *ctx"
-.Fa "const void *key"
-.Fa "size_t key_len"
-.Fa "const EVP_CIPHER *cipher"
-.Fa "ENGINE *engine"
-.Fc
-.Ft int
-.Fo CMAC_Update
-.Fa "CMAC_CTX *ctx"
-.Fa "const void *in_data"
-.Fa "size_t in_len"
-.Fc
-.Ft int
-.Fo CMAC_Final
-.Fa "CMAC_CTX *ctx"
-.Fa "unsigned char *out_mac"
-.Fa "size_t *out_len"
-.Fc
-.Ft int
-.Fo CMAC_CTX_copy
-.Fa "CMAC_CTX *out_ctx"
-.Fa "CMAC_CTX *in_ctx"
-.Fc
-.Ft EVP_CIPHER_CTX *
-.Fn CMAC_CTX_get0_cipher_ctx "CMAC_CTX *ctx"
-.Ft void
-.Fn CMAC_CTX_cleanup "CMAC_CTX *ctx"
-.Ft void
-.Fn CMAC_CTX_free "CMAC_CTX *ctx"
-.Sh DESCRIPTION
-CMAC is a message authentication code algorithm that can employ an
-arbitrary block cipher using a symmetric key.
-.Pp
-The present manual page describes low-level functions implementing CMAC.
-Instead of using these functions directly,
-application programs normally call
-.Xr EVP_PKEY_new_CMAC_key 3
-and then pass the resulting
-.Vt EVP_PKEY
-object to
-.Xr EVP_DigestSignInit 3 .
-.Pp
-The CMAC API is object-oriented.
-Calculating a message authentication code requires a
-.Vt CMAC_CTX
-object.
-Usually, the functions
-.Fn CMAC_CTX_new ,
-.Fn CMAC_Init ,
-.Fn CMAC_Update ,
-.Fn CMAC_Final ,
-and
-.Fn CMAC_CTX_free
-need to be called in this order.
-.Pp
-.Fn CMAC_CTX_new
-allocates a new
-.Vt CMAC_CTX
-object, initializes the embedded
-.Vt EVP_CIPHER_CTX
-object, and marks the object itself as uninitialized.
-.Pp
-.Fn CMAC_Init
-selects the given block
-.Fa cipher
-for use by
-.Fa ctx .
-Functions to obtain suitable
-.Vt EVP_CIPHER
-objects are listed in the CIPHER LISTING section of the
-.Xr EVP_EncryptInit 3
-manual page.
-Unless
-.Fa key
-is
-.Dv NULL ,
-.Fn CMAC_Init
-also initializes
-.Fa ctx
-for use with the given symmetric
-.Fa key
-that is
-.Fa key_len
-bytes long.
-In particular, it calculates and internally stores the two subkeys
-and initializes
-.Fa ctx
-for subsequently feeding in data with
-.Fn CMAC_Update .
-The
-.Fa engine
-argument is ignored; passing
-.Dv NULL
-is recommended.
-.Pp
-If
-.Fa ctx
-is already initialized,
-.Fn CMAC_Init
-can be called again with
-.Fa key
-and
-.Fa cipher
-both set to
-.Dv NULL
-and
-.Fa key_len
-set to 0.
-In that case, any data already processed is discarded and
-.Fa ctx
-is re-initialized to start reading data anew.
-.Pp
-.Fn CMAC_Update
-processes
-.Fa in_len
-bytes of input data pointed to by
-.Fa in_data .
-Depending on the number of input bytes already cached in
-.Fa ctx ,
-on
-.Fa in_len ,
-and on the block size, this may encrypt zero or more blocks.
-Unless
-.Fa in_len
-is zero, this function leaves at least one byte and at most one
-block of input cached but unprocessed inside the
-.Fa ctx
-object.
-.Fn CMAC_Update
-can be called multiple times
-to concatenate several chunks of input data of varying sizes.
-.Pp
-.Fn CMAC_Final
-stores the length of the message authentication code in bytes,
-which equals the cipher block size, into
-.Pf * Fa out_len .
-Unless
-.Fa out_mac
-is
-.Dv NULL ,
-it encrypts the last block, padding it if required, and copies the
-resulting message authentication code to
-.Fa out_mac .
-The caller is responsible for providing a buffer of sufficient size.
-.Pp
-.Fn CMAC_CTX_copy
-performs a deep copy of the already initialized
-.Fa in_ctx
-into
-.Fa out_ctx .
-.Pp
-.Fn CMAC_CTX_cleanup
-zeros out both subkeys and all temporary data in
-.Fa ctx
-and in the embedded
-.Vt EVP_CIPHER_CTX
-object, frees all allocated memory associated with it,
-except for
-.Fa ctx
-itself, and marks it as uninitialized,
-such that it can be reused for subsequent
-.Fn CMAC_Init .
-.Pp
-.Fn CMAC_CTX_free
-calls
-.Fn CMAC_CTX_cleanup ,
-then frees
-.Fa ctx
-itself.
-If
-.Fa ctx
-is
-.Dv NULL ,
-no action occurs.
-.Sh RETURN VALUES
-.Fn CMAC_CTX_new
-returns the new context object or
-.Dv NULL
-in case of failure.
-It succeeds unless memory is exhausted.
-.Pp
-.Fn CMAC_Init ,
-.Fn CMAC_Update ,
-.Fn CMAC_Final ,
-and
-.Fn CMAC_CTX_copy
-return 1 on success or 0 on failure.
-.Fn CMAC_Init
-fails if initializing the embedded
-.Vt EVP_CIPHER_CTX
-object fails.
-The others fail if
-.Fa in_ctx
-is uninitialized.
-.Fn CMAC_Update
-and
-.Fn CMAC_Final
-also fail if encrypting a block fails, and
-.Fn CMAC_CTX_copy
-if copying the embedded
-.Vt EVP_CIPHER_CTX
-object fails, which can for example happen when memory is exhausted.
-.Pp
-.Fn CMAC_CTX_get0_cipher_ctx
-returns an internal pointer to the
-.Vt EVP_CIPHER_CTX
-object that is embedded in
-.Fa ctx .
-.Sh ERRORS
-The CMAC code itself does not use the
-.In openssl/err.h
-framework, so in general, the reasons for failure cannot be found out with
-.Xr ERR_get_error 3 .
-However, since the
-.Xr EVP_EncryptInit 3
-functions are used internally, entries may still get pushed onto
-the error stack in some cases of failure.
-.Sh SEE ALSO
-.Xr EVP_aes_128_cbc 3 ,
-.Xr EVP_DigestSignInit 3 ,
-.Xr EVP_EncryptInit 3 ,
-.Xr EVP_PKEY_new_CMAC_key 3 ,
-.Xr HMAC 3
-.Sh STANDARDS
-.Rs
-.%A Morris Dworkin
-.%T "Recommendation for Block Cipher Modes of Operation:\
- The CMAC Mode for Authentication"
-.%I National Institute of Standards and Technology
-.%R NIST Special Publication 800-38B
-.%U https://doi.org/10.6028/NIST.SP.800-38B
-.%C Gaithersburg, Maryland
-.%D May 2005, updated October 6, 2016
-.Re
-.Sh HISTORY
-These functions first appeared in OpenSSL 1.0.1
-and have been available since
-.Ox 5.3 .