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b544047c99
Fixes #5539: Create a new manual page `CMAC_CTX.pod` documenting the deprecated `CMAC_CTX` functions and add the necessary build dependencies. This page includes function descriptions, usage details, and replacement suggestions with the `EVP_MAC` interface. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/24814)
115 lines
3.9 KiB
Plaintext
115 lines
3.9 KiB
Plaintext
=pod
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=head1 NAME
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CMAC_CTX, CMAC_CTX_new, CMAC_CTX_cleanup, CMAC_CTX_free,
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CMAC_CTX_get0_cipher_ctx, CMAC_CTX_copy, CMAC_Init, CMAC_Update, CMAC_Final,
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CMAC_resume
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- create cipher-based message authentication codes
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=head1 SYNOPSIS
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#include <openssl/cmac.h>
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The following functions have been deprecated since OpenSSL 3.0, and can be
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disabled entirely by defining B<OPENSSL_API_COMPAT> with a suitable version
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value, see L<openssl_user_macros(7)>.
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typedef struct CMAC_CTX_st CMAC_CTX;
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CMAC_CTX *CMAC_CTX_new(void);
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void CMAC_CTX_cleanup(CMAC_CTX *ctx);
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void CMAC_CTX_free(CMAC_CTX *ctx);
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EVP_CIPHER_CTX *CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx);
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int CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in);
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int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
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const EVP_CIPHER *cipher, ENGINE *impl);
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int CMAC_Update(CMAC_CTX *ctx, const void *data, size_t dlen);
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int CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen);
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int CMAC_resume(CMAC_CTX *ctx);
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=head1 DESCRIPTION
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The low-level MAC functions documented on this page are deprecated.
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Applications should use the new L<EVP_MAC(3)> interface.
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Specifically, utilize the following functions for MAC operations:
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=over 4
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=item L<EVP_MAC_CTX_new(3)> to create a new MAC context.
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=item L<EVP_MAC_CTX_free(3)> to free the MAC context.
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=item L<EVP_MAC_init(3)> to initialize the MAC context.
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=item L<EVP_MAC_update(3)> to update the MAC with data.
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=item L<EVP_MAC_final(3)> to finalize the MAC and retrieve the output.
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=back
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Alternatively, for a single-step MAC computation, use the L<EVP_Q_mac(3)>
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function.
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The B<CMAC_CTX> type is a structure used for the provision of CMAC
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(Cipher-based Message Authentication Code) operations.
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CMAC_CTX_new() creates a new B<CMAC_CTX> structure and returns a pointer to it.
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CMAC_CTX_cleanup() resets the B<CMAC_CTX> structure, clearing any internal data
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but not freeing the structure itself.
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CMAC_CTX_free() frees the B<CMAC_CTX> structure and any associated resources.
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If the argument is NULL, no action is taken.
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CMAC_CTX_get0_cipher_ctx() returns a pointer to the internal B<EVP_CIPHER_CTX>
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structure within the B<CMAC_CTX>.
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CMAC_CTX_copy() copies the state from one B<CMAC_CTX> structure to another.
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CMAC_Init() initializes the B<CMAC_CTX> structure for a new CMAC calculation
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with the specified key, key length, and cipher type.
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Optionally, an B<ENGINE> can be provided.
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CMAC_Update() processes data to be included in the CMAC calculation.
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This function can be called multiple times to update the context with
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additional data.
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CMAC_Final() finalizes the CMAC calculation and retrieves the resulting
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MAC value. The output is stored in the provided buffer, and the length is
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stored in the variable pointed to by I<poutlen>. To determine the required
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buffer size, call with I<out> set to NULL, which stores only the length in
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I<poutlen>. Allocate a buffer of this size and call CMAC_Final() again with
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the allocated buffer to retrieve the MAC.
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CMAC_resume() resumes a previously finalized CMAC calculation, allowing
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additional data to be processed and a new MAC to be generated.
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=head1 RETURN VALUES
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CMAC_CTX_new() returns a pointer to a new B<CMAC_CTX> structure or NULL if
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an error occurs.
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CMAC_CTX_get0_cipher_ctx() returns a pointer to the internal
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B<EVP_CIPHER_CTX> structure, or NULL if an error occurs.
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CMAC_CTX_copy(), CMAC_Init(), CMAC_Update(), CMAC_Final() and CMAC_resume()
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return 1 for success or 0 if an error occurs.
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=head1 HISTORY
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All functions described here were deprecated in OpenSSL 3.0. For replacements,
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see L<EVP_MAC_CTX_new(3)>, L<EVP_MAC_CTX_free(3)>, L<EVP_MAC_init(3)>,
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L<EVP_MAC_update(3)>, and L<EVP_MAC_final(3)>.
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=head1 COPYRIGHT
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Copyright 2024 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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