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EVP_MAC-BLAKE2(7)		    OpenSSL		     EVP_MAC-BLAKE2(7)

NAME
       EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC -	The BLAKE2
       EVP_MAC implementations

DESCRIPTION
       Support for computing BLAKE2 MACs through the EVP_MAC API.

   Identity
       These implementations are identified with one of	these names and
       properties, to be used with EVP_MAC_fetch():

       "BLAKE2BMAC", "provider=default"
       "BLAKE2SMAC", "provider=default"

   Supported parameters
       The general description of these	parameters can be found	in
       "PARAMETERS" in EVP_MAC(3).

       All these parameters can	be set with EVP_MAC_CTX_set_params().
       Furthermore, the	"size" parameter can be	retrieved with
       EVP_MAC_CTX_get_params(), or with EVP_MAC_size().  The length of	the
       "size" parameter	should not exceed that of a size_t.

       "key" (OSSL_MAC_PARAM_KEY) <octet string>
	   This	may be at most 64 bytes	for BLAKE2BMAC or 32 for BLAKE2SMAC
	   and at least	1 byte in both cases.

       "custom"	(OSSL_MAC_PARAM_CUSTOM)	<octet string>
	   This	is an optional value of	at most	16 bytes for BLAKE2BMAC	or 8
	   for BLAKE2SMAC.  It is empty	by default.

       "salt" (OSSL_MAC_PARAM_SALT) <octet string>
	   This	is an optional value of	at most	16 bytes for BLAKE2BMAC	or 8
	   for BLAKE2SMAC.  It is empty	by default.

       "size" (OSSL_MAC_PARAM_SIZE) <unsigned integer>
	   When	set, this can be any number between between 1 and 32 for
	   EVP_MAC_BLAKE2S or 64 for EVP_MAC_BLAKE2B.  It is 32	and 64
	   respectively	by default.

SEE ALSO
       EVP_MAC_CTX_get_params(3), EVP_MAC_CTX_set_params(3), "PARAMETERS" in
       EVP_MAC(3), OSSL_PARAM(3)

HISTORY
       The macros and functions	described here were added to OpenSSL 3.0.

COPYRIGHT
       Copyright 2018-2020 The OpenSSL Project Authors.	All Rights Reserved.

       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
       <https://www.openssl.org/source/license.html>.

3.0.0-alpha6			  2020-08-06		     EVP_MAC-BLAKE2(7)

NAME | DESCRIPTION | SEE ALSO | HISTORY | COPYRIGHT

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