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										 |  |  | =pod | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =head1 NAME | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | provider-mac - The mac library E<lt>-E<gt> provider functions | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =head1 SYNOPSIS | 
					
						
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 | 
					
						
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										 |  |  | =for openssl multiple includes | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  |  #include <openssl/core_dispatch.h> | 
					
						
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										 |  |  |  #include <openssl/core_names.h> | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  |  /* | 
					
						
							|  |  |  |   * None of these are actual functions, but are displayed like this for | 
					
						
							|  |  |  |   * the function signatures for functions that are offered as function | 
					
						
							|  |  |  |   * pointers in OSSL_DISPATCH arrays. | 
					
						
							|  |  |  |   */ | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  |  /* Context management */ | 
					
						
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										 |  |  |  void *OSSL_FUNC_mac_newctx(void *provctx); | 
					
						
							|  |  |  |  void OSSL_FUNC_mac_freectx(void *mctx); | 
					
						
							|  |  |  |  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, | 
					
						
							|  |  |  |                         const OSSL_PARAM params[]); | 
					
						
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										 |  |  |  int OSSL_FUNC_mac_update(void *mctx, const unsigned char *in, size_t inl); | 
					
						
							|  |  |  |  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); | 
					
						
							|  |  |  |  const OSSL_PARAM *OSSL_FUNC_mac_gettable_ctx_params(void *mctx, void *provctx); | 
					
						
							|  |  |  |  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[]); | 
					
						
							|  |  |  |  int OSSL_FUNC_mac_get_ctx_params(void *mctx, OSSL_PARAM params[]); | 
					
						
							|  |  |  |  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)> | 
					
						
							|  |  |  | for further information. | 
					
						
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 | 
					
						
							|  |  |  | The MAC operation enables providers to implement mac algorithms and make | 
					
						
							|  |  |  | 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 L<OSSL_DISPATCH(3)> arrays via | 
					
						
							|  |  |  | L<OSSL_ALGORITHM(3)> arrays that are returned by the provider's | 
					
						
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										 |  |  | provider_query_operation() function | 
					
						
							|  |  |  | (see L<provider-base(7)/Provider Functions>). | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 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 L<OSSL_DISPATCH(3)> element named | 
					
						
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										 |  |  | B<OSSL_FUNC_{name}>. | 
					
						
							|  |  |  | For example, the "function" OSSL_FUNC_mac_newctx() has these: | 
					
						
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										 |  |  | 
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										 |  |  |  typedef void *(OSSL_FUNC_mac_newctx_fn)(void *provctx); | 
					
						
							|  |  |  |  static ossl_inline OSSL_FUNC_mac_newctx_fn | 
					
						
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										 |  |  |      OSSL_FUNC_mac_newctx(const OSSL_DISPATCH *opf); | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | L<OSSL_DISPATCH(3)> 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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										 |  |  | 
 | 
					
						
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										 |  |  |  OSSL_FUNC_mac_newctx               OSSL_FUNC_MAC_NEWCTX | 
					
						
							|  |  |  |  OSSL_FUNC_mac_freectx              OSSL_FUNC_MAC_FREECTX | 
					
						
							|  |  |  |  OSSL_FUNC_mac_dupctx               OSSL_FUNC_MAC_DUPCTX | 
					
						
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										 |  |  |  OSSL_FUNC_mac_init                 OSSL_FUNC_MAC_INIT | 
					
						
							|  |  |  |  OSSL_FUNC_mac_update               OSSL_FUNC_MAC_UPDATE | 
					
						
							|  |  |  |  OSSL_FUNC_mac_final                OSSL_FUNC_MAC_FINAL | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  |  OSSL_FUNC_mac_get_params           OSSL_FUNC_MAC_GET_PARAMS | 
					
						
							|  |  |  |  OSSL_FUNC_mac_get_ctx_params       OSSL_FUNC_MAC_GET_CTX_PARAMS | 
					
						
							|  |  |  |  OSSL_FUNC_mac_set_ctx_params       OSSL_FUNC_MAC_SET_CTX_PARAMS | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  |  OSSL_FUNC_mac_gettable_params      OSSL_FUNC_MAC_GETTABLE_PARAMS | 
					
						
							|  |  |  |  OSSL_FUNC_mac_gettable_ctx_params  OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS | 
					
						
							|  |  |  |  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. | 
					
						
							|  |  |  | 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(), | 
					
						
							|  |  |  | 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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 | 
					
						
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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. | 
					
						
							|  |  |  | A pointer to this context will be passed back in a number of the other mac | 
					
						
							|  |  |  | 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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										 |  |  | 
 | 
					
						
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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. | 
					
						
							|  |  |  | If it receives NULL as I<mctx> value, it should not do anything other than | 
					
						
							|  |  |  | return. | 
					
						
							|  |  |  | This function should free any resources associated with that context. | 
					
						
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 | 
					
						
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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. | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =head2 Encryption/Decryption Functions | 
					
						
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 | 
					
						
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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 | 
					
						
							|  |  |  | the MAC I<key> of I<keylen> bytes. | 
					
						
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										 |  |  | 
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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. | 
					
						
							|  |  |  | The I<mctx> parameter contains a pointer to a previously initialised provider | 
					
						
							|  |  |  | side context. | 
					
						
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										 |  |  | OSSL_FUNC_mac_update() may be called multiple times for a single mac operation. | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | OSSL_FUNC_mac_final() completes the MAC computation started through previous | 
					
						
							|  |  |  | 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. | 
					
						
							|  |  |  | The resulting MAC should be written to I<out> and the amount of data written | 
					
						
							|  |  |  | to I<*outl>, which should not exceed I<outsize> bytes. | 
					
						
							|  |  |  | The same expectations apply to I<outsize> as documented for | 
					
						
							|  |  |  | 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 | 
					
						
							|  |  |  | these functions. | 
					
						
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 | 
					
						
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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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 | 
					
						
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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>. | 
					
						
							|  |  |  | Any parameter settings are additional to any that were previously set. | 
					
						
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										 |  |  | Passing NULL for I<params> should return true. | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | OSSL_FUNC_mac_get_ctx_params() gets details of currently set parameter values | 
					
						
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										 |  |  | associated with the given provider side mac context I<mctx> and stores them | 
					
						
							|  |  |  | in I<params>. | 
					
						
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										 |  |  | Passing NULL for I<params> should return true. | 
					
						
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										 |  |  | 
 | 
					
						
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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 L<OSSL_PARAM(3)> | 
					
						
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										 |  |  | arrays as descriptors of the parameters that OSSL_FUNC_mac_get_params(), | 
					
						
							|  |  |  | OSSL_FUNC_mac_get_ctx_params(), and OSSL_FUNC_mac_set_ctx_params() | 
					
						
							|  |  |  | can handle, respectively.  OSSL_FUNC_mac_gettable_ctx_params() and | 
					
						
							|  |  |  | OSSL_FUNC_mac_settable_ctx_params() will return the parameters associated | 
					
						
							|  |  |  | with the provider side context I<mctx> in its current state if it is | 
					
						
							|  |  |  | not NULL.  Otherwise, they return the parameters associated with the | 
					
						
							|  |  |  | provider side algorithm I<provctx>. | 
					
						
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 | 
					
						
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										 |  |  | All MAC implementations are expected to handle the following parameters: | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | =over 4 | 
					
						
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 | 
					
						
							|  |  |  | =item with OSSL_FUNC_set_ctx_params(): | 
					
						
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										 |  |  | 
 | 
					
						
							|  |  |  | =over 4 | 
					
						
							|  |  |  | 
 | 
					
						
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										 |  |  | =item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string> | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | Sets the key in the associated MAC ctx.  This is identical to passing a I<key> | 
					
						
							|  |  |  | argument to the OSSL_FUNC_mac_init() function. | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | =back | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | =item with OSSL_FUNC_get_params(): | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | =over 4 | 
					
						
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										 |  |  | 
 | 
					
						
							| 
									
										
										
										
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										 |  |  | =item "size" (B<OSSL_MAC_PARAM_SIZE>) <integer> | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | Can be used to get the default MAC size (which might be the only allowable | 
					
						
							|  |  |  | MAC size for the implementation). | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | Note that some implementations allow setting the size that the resulting MAC | 
					
						
							|  |  |  | should have as well, see the documentation of the implementation. | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =back | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | =over 4 | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =item "size" (B<OSSL_MAC_PARAM_BLOCK_SIZE>) <integer> | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | Can be used to get the MAC block size (if supported by the algorithm). | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =back | 
					
						
							|  |  |  | 
 | 
					
						
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										 |  |  | =back | 
					
						
							|  |  |  | 
 | 
					
						
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										 |  |  | =head1 NOTES | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | The MAC life-cycle is described in L<life_cycle-rand(7)>.  Providers should | 
					
						
							|  |  |  | ensure that the various transitions listed there are supported.  At some point | 
					
						
							|  |  |  | the EVP layer will begin enforcing the listed transitions. | 
					
						
							|  |  |  | 
 | 
					
						
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										 |  |  | =head1 RETURN VALUES | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2020-06-21 07:19:16 +08:00
										 |  |  | OSSL_FUNC_mac_newctx() and OSSL_FUNC_mac_dupctx() should return the newly created | 
					
						
							| 
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 |  |  | provider side mac context, or NULL on failure. | 
					
						
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 | 
					
						
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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(), | 
					
						
							|  |  |  | OSSL_FUNC_mac_get_ctx_params() and OSSL_FUNC_mac_set_ctx_params() should return 1 for | 
					
						
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											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 | 
					
						
							| 
									
										
										
										
											2022-12-05 23:59:06 +08:00
										 |  |  | OSSL_FUNC_mac_settable_ctx_params() should return a constant L<OSSL_PARAM(3)> | 
					
						
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											2019-05-07 18:39:58 +08:00
										 |  |  | array, or NULL if none is offered. | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =head1 SEE ALSO | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2021-03-02 01:46:20 +08:00
										 |  |  | L<provider(7)>, | 
					
						
							|  |  |  | 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
										 |  |  | L<EVP_MAC-Siphash(7)>, | 
					
						
							|  |  |  | L<life_cycle-mac(7)>, L<EVP_MAC(3)> | 
					
						
							| 
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 |  |  | 
 | 
					
						
							|  |  |  | =head1 HISTORY | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | The provider MAC interface was introduced in OpenSSL 3.0. | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =head1 COPYRIGHT | 
					
						
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 | 
					
						
							| 
									
										
										
										
											2021-02-18 22:57:13 +08:00
										 |  |  | Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved. | 
					
						
							| 
									
										
										
										
											2019-05-07 18:39:58 +08:00
										 |  |  | 
 | 
					
						
							|  |  |  | Licensed under the Apache License 2.0 (the "License").  You may not use | 
					
						
							|  |  |  | this file except in compliance with the License.  You can obtain a copy | 
					
						
							|  |  |  | in the file LICENSE in the source distribution or at | 
					
						
							|  |  |  | L<https://www.openssl.org/source/license.html>. | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | =cut |