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								=pod
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								=head1 NAME
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								provider-mac - The mac library E<lt>-E<gt> provider functions
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								=head1 SYNOPSIS
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											2019-09-29 23:10:59 +08:00
										 
									 
								 
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								=for openssl multiple includes
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								 #include <openssl/core_dispatch.h>
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								 #include <openssl/core_names.h>
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								 /*
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								  * None of these are actual functions, but are displayed like this for
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								  * the function signatures for functions that are offered as function
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								  * pointers in OSSL_DISPATCH arrays.
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								  */
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								 /* Context management */
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								 void *OSSL_FUNC_mac_newctx(void *provctx);
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								 void OSSL_FUNC_mac_freectx(void *mctx);
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								 void *OSSL_FUNC_mac_dupctx(void *src);
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								 /* Encryption/decryption */
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								 int OSSL_FUNC_mac_init(void *mctx, unsigned char *key, size_t keylen,
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								                        const OSSL_PARAM params[]);
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								 int OSSL_FUNC_mac_update(void *mctx, const unsigned char *in, size_t inl);
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								 int OSSL_FUNC_mac_final(void *mctx, unsigned char *out, size_t *outl, size_t outsize);
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								 /* MAC parameter descriptors */
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								 const OSSL_PARAM *OSSL_FUNC_mac_gettable_params(void *provctx);
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								 const OSSL_PARAM *OSSL_FUNC_mac_gettable_ctx_params(void *mctx, void *provctx);
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								 const OSSL_PARAM *OSSL_FUNC_mac_settable_ctx_params(void *mctx, void *provctx);
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								 /* MAC parameters */
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								 int OSSL_FUNC_mac_get_params(OSSL_PARAM params[]);
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								 int OSSL_FUNC_mac_get_ctx_params(void *mctx, OSSL_PARAM params[]);
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								 int OSSL_FUNC_mac_set_ctx_params(void *mctx, const OSSL_PARAM params[]);
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								=head1 DESCRIPTION
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								This documentation is primarily aimed at provider authors. See L<provider(7)>
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								for further information.
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								The MAC operation enables providers to implement mac algorithms and make
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								them available to applications via the API functions L<EVP_MAC_init(3)>,
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								L<EVP_MAC_update(3)> and L<EVP_MAC_final(3)>.
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								All "functions" mentioned here are passed as function pointers between
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								F<libcrypto> and the provider in B<OSSL_DISPATCH> arrays via
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								B<OSSL_ALGORITHM> arrays that are returned by the provider's
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								provider_query_operation() function
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								(see L<provider-base(7)/Provider Functions>).
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								All these "functions" have a corresponding function type definition
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								named B<OSSL_FUNC_{name}_fn>, and a helper function to retrieve the
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								function pointer from an B<OSSL_DISPATCH> element named
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								B<OSSL_FUNC_{name}>.
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								For example, the "function" OSSL_FUNC_mac_newctx() has these:
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								 typedef void *(OSSL_FUNC_mac_newctx_fn)(void *provctx);
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								 static ossl_inline OSSL_FUNC_mac_newctx_fn
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								     OSSL_FUNC_mac_newctx(const OSSL_DISPATCH *opf);
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								B<OSSL_DISPATCH> arrays are indexed by numbers that are provided as
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								macros in L<openssl-core_dispatch.h(7)>, as follows:
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								 OSSL_FUNC_mac_newctx               OSSL_FUNC_MAC_NEWCTX
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								 OSSL_FUNC_mac_freectx              OSSL_FUNC_MAC_FREECTX
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								 OSSL_FUNC_mac_dupctx               OSSL_FUNC_MAC_DUPCTX
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								 OSSL_FUNC_mac_init                 OSSL_FUNC_MAC_INIT
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								 OSSL_FUNC_mac_update               OSSL_FUNC_MAC_UPDATE
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								 OSSL_FUNC_mac_final                OSSL_FUNC_MAC_FINAL
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								 OSSL_FUNC_mac_get_params           OSSL_FUNC_MAC_GET_PARAMS
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								 OSSL_FUNC_mac_get_ctx_params       OSSL_FUNC_MAC_GET_CTX_PARAMS
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								 OSSL_FUNC_mac_set_ctx_params       OSSL_FUNC_MAC_SET_CTX_PARAMS
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								 OSSL_FUNC_mac_gettable_params      OSSL_FUNC_MAC_GETTABLE_PARAMS
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								 OSSL_FUNC_mac_gettable_ctx_params  OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS
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								 OSSL_FUNC_mac_settable_ctx_params  OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS
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								A mac algorithm implementation may not implement all of these functions.
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								In order to be a consistent set of functions, at least the following functions
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								must be implemented: OSSL_FUNC_mac_newctx(), OSSL_FUNC_mac_freectx(), OSSL_FUNC_mac_init(),
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								OSSL_FUNC_mac_update(), OSSL_FUNC_mac_final().
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								All other functions are optional.
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								=head2 Context Management Functions
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								OSSL_FUNC_mac_newctx() should create and return a pointer to a provider side
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								structure for holding context information during a mac operation.
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								A pointer to this context will be passed back in a number of the other mac
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								operation function calls.
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								The parameter I<provctx> is the provider context generated during provider
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								initialisation (see L<provider(7)>).
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								OSSL_FUNC_mac_freectx() is passed a pointer to the provider side mac context in
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								the I<mctx> parameter.
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								If it receives NULL as I<mctx> value, it should not do anything other than
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								return.
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								This function should free any resources associated with that context.
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								OSSL_FUNC_mac_dupctx() should duplicate the provider side mac context in the
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								I<mctx> parameter and return the duplicate copy.
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								=head2 Encryption/Decryption Functions
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								OSSL_FUNC_mac_init() initialises a mac operation given a newly created provider
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								side mac context in the I<mctx> parameter.  The I<params> are set before setting
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								the MAC I<key> of I<keylen> bytes.
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								OSSL_FUNC_mac_update() is called to supply data for MAC computation of a previously
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								initialised mac operation.
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								The I<mctx> parameter contains a pointer to a previously initialised provider
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								side context.
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								OSSL_FUNC_mac_update() may be called multiple times for a single mac operation.
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								OSSL_FUNC_mac_final() completes the MAC computation started through previous
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								OSSL_FUNC_mac_init() and OSSL_FUNC_mac_update() calls.
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								The I<mctx> parameter contains a pointer to the provider side context.
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								The resulting MAC should be written to I<out> and the amount of data written
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								to I<*outl>, which should not exceed I<outsize> bytes.
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								The same expectations apply to I<outsize> as documented for
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								L<EVP_MAC_final(3)>.
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								=head2 Mac Parameters
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								See L<OSSL_PARAM(3)> for further details on the parameters structure used by
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								these functions.
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											2020-06-21 07:19:16 +08:00
										 
									 
								 
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								OSSL_FUNC_mac_get_params() gets details of parameter values associated with the
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								provider algorithm and stores them in I<params>.
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								OSSL_FUNC_mac_set_ctx_params() sets mac parameters associated with the given
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								provider side mac context I<mctx> to I<params>.
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								Any parameter settings are additional to any that were previously set.
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											2021-03-03 09:32:39 +08:00
										 
									 
								 
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								Passing NULL for I<params> should return true.
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											2020-06-21 07:19:16 +08:00
										 
									 
								 
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								OSSL_FUNC_mac_get_ctx_params() gets details of currently set parameter values
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
							 | 
							
								
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								associated with the given provider side mac context I<mctx> and stores them
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								in I<params>.
							 | 
						
					
						
							
								
									
										
										
										
											2021-03-03 09:32:39 +08:00
										 
									 
								 
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								Passing NULL for I<params> should return true.
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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											2021-02-23 09:03:31 +08:00
										 
									 
								 
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								OSSL_FUNC_mac_gettable_params(), OSSL_FUNC_mac_gettable_ctx_params(),
							 | 
						
					
						
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							 | 
							
							
								and OSSL_FUNC_mac_settable_ctx_params() all return constant B<OSSL_PARAM>
							 | 
						
					
						
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								arrays as descriptors of the parameters that OSSL_FUNC_mac_get_params(),
							 | 
						
					
						
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							 | 
							
								
							 | 
							
							
								OSSL_FUNC_mac_get_ctx_params(), and OSSL_FUNC_mac_set_ctx_params()
							 | 
						
					
						
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							 | 
							
							
								can handle, respectively.  OSSL_FUNC_mac_gettable_ctx_params() and
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								OSSL_FUNC_mac_settable_ctx_params() will return the parameters associated
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								with the provider side context I<mctx> in its current state if it is
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								not NULL.  Otherwise, they return the parameters associated with the
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								provider side algorithm I<provctx>.
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											2021-03-02 01:46:20 +08:00
										 
									 
								 
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								All MAC implementations are expected to handle the following parameters:
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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											2021-03-02 01:46:20 +08:00
										 
									 
								 
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								=over 4
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								=item with OSSL_FUNC_set_ctx_params():
							 | 
						
					
						
							
								
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 
									 
								 
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								=over 4
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											2019-09-10 16:05:57 +08:00
										 
									 
								 
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								=item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string>
							 | 
						
					
						
							
								
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 
									 
								 
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											2021-02-25 12:30:57 +08:00
										 
									 
								 
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								Sets the key in the associated MAC ctx.  This is identical to passing a I<key>
							 | 
						
					
						
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								argument to the OSSL_FUNC_mac_init() function.
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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											2021-03-02 01:46:20 +08:00
										 
									 
								 
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								=back
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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											2021-03-02 01:46:20 +08:00
										 
									 
								 
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								=item with OSSL_FUNC_get_params():
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											2021-03-02 01:46:20 +08:00
										 
									 
								 
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								=over 4
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											2019-09-10 16:05:57 +08:00
										 
									 
								 
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								=item "size" (B<OSSL_MAC_PARAM_SIZE>) <integer>
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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											2021-03-02 01:46:20 +08:00
										 
									 
								 
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								Can be used to get the default MAC size (which might be the only allowable
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								MAC size for the implementation).
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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											2021-03-02 01:46:20 +08:00
										 
									 
								 
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								Note that some implementations allow setting the size that the resulting MAC
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								should have as well, see the documentation of the implementation.
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								=back
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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											2021-05-24 12:15:41 +08:00
										 
									 
								 
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								=over 4
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								=item "size" (B<OSSL_MAC_PARAM_BLOCK_SIZE>) <integer>
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								Can be used to get the MAC block size (if supported by the algorithm).
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								=back
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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								=back
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											2021-03-24 11:38:57 +08:00
										 
									 
								 
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								=head1 NOTES
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								The MAC life-cycle is described in L<life_cycle-rand(7)>.  Providers should
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								ensure that the various transitions listed there are supported.  At some point
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								the EVP layer will begin enforcing the listed transitions.
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											2019-05-07 18:39:58 +08:00
										 
									 
								 
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								=head1 RETURN VALUES
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											2020-06-21 07:19:16 +08:00
										 
									 
								 
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								OSSL_FUNC_mac_newctx() and OSSL_FUNC_mac_dupctx() should return the newly created
							 | 
						
					
						
							
								
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 
									 
								 
							 | 
							
								
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								provider side mac context, or NULL on failure.
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											2020-06-21 07:19:16 +08:00
										 
									 
								 
							 | 
							
								
									
										
									
								
							 | 
							
								
							 | 
							
							
								OSSL_FUNC_mac_init(), OSSL_FUNC_mac_update(), OSSL_FUNC_mac_final(), OSSL_FUNC_mac_get_params(),
							 | 
						
					
						
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								OSSL_FUNC_mac_get_ctx_params() and OSSL_FUNC_mac_set_ctx_params() should return 1 for
							 | 
						
					
						
							
								
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 
									 
								 
							 | 
							
								
							 | 
							
								
							 | 
							
							
								success or 0 on error.
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											2020-06-21 07:19:16 +08:00
										 
									 
								 
							 | 
							
								
									
										
									
								
							 | 
							
								
							 | 
							
							
								OSSL_FUNC_mac_gettable_params(), OSSL_FUNC_mac_gettable_ctx_params() and
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
							
								OSSL_FUNC_mac_settable_ctx_params() should return a constant B<OSSL_PARAM>
							 | 
						
					
						
							
								
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 
									 
								 
							 | 
							
								
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								array, or NULL if none is offered.
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								=head1 SEE ALSO
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											2021-03-02 01:46:20 +08:00
										 
									 
								 
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								L<provider(7)>,
							 | 
						
					
						
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							 | 
							
							
								L<EVP_MAC-BLAKE2(7)>, L<EVP_MAC-CMAC(7)>, L<EVP_MAC-GMAC(7)>,
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
							
								L<EVP_MAC-HMAC(7)>, L<EVP_MAC-KMAC(7)>, L<EVP_MAC-Poly1305(7)>,
							 | 
						
					
						
							
								
									
										
										
										
											2021-03-24 11:38:57 +08:00
										 
									 
								 
							 | 
							
								
									
										
									
								
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								L<EVP_MAC-Siphash(7)>,
							 | 
						
					
						
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							 | 
							
								
							 | 
							
							
								L<life_cycle-mac(7)>, L<EVP_MAC(3)>
							 | 
						
					
						
							
								
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 
									 
								 
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								=head1 HISTORY
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								The provider MAC interface was introduced in OpenSSL 3.0.
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								=head1 COPYRIGHT
							 | 
						
					
						
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							 | 
						
					
						
							
								
									
										
										
										
											2021-02-18 22:57:13 +08:00
										 
									 
								 
							 | 
							
								
									
										
									
								
							 | 
							
								
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								Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
							 | 
						
					
						
							
								
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 
									 
								 
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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
							 |