1EVP_MAC-BLAKE2(7ossl)               OpenSSL              EVP_MAC-BLAKE2(7ossl)
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NAME

6       EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC - The BLAKE2
7       EVP_MAC implementations
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DESCRIPTION

10       Support for computing BLAKE2 MACs through the EVP_MAC API.
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12   Identity
13       These implementations are identified with one of these names and
14       properties, to be used with EVP_MAC_fetch():
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16       "BLAKE2BMAC", "provider=default"
17       "BLAKE2SMAC", "provider=default"
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19   Supported parameters
20       The general description of these parameters can be found in
21       "PARAMETERS" in EVP_MAC(3).
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23       All these parameters can be set with EVP_MAC_CTX_set_params().
24       Furthermore, the "size" parameter can be retrieved with
25       EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_mac_size().  The
26       length of the "size" parameter should not exceed that of a size_t.
27       Likewise, the "block-size" parameter can be retrieved with
28       EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_block_size().
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30       "key" (OSSL_MAC_PARAM_KEY) <octet string>
31           Sets the MAC key.  It may be at most 64 bytes for BLAKE2BMAC or 32
32           for BLAKE2SMAC and at least 1 byte in both cases.  Setting this
33           parameter is identical to passing a key to EVP_MAC_init(3).
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35       "custom" (OSSL_MAC_PARAM_CUSTOM) <octet string>
36           Sets the custom value.  It is an optional value of at most 16 bytes
37           for BLAKE2BMAC or 8 for BLAKE2SMAC, and is empty by default.
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39       "salt" (OSSL_MAC_PARAM_SALT) <octet string>
40           Sets the salt.  It is an optional value of at most 16 bytes for
41           BLAKE2BMAC or 8 for BLAKE2SMAC, and is empty by default.
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43       "size" (OSSL_MAC_PARAM_SIZE) <unsigned integer>
44           Sets the MAC size.  It can be any number between 1 and 32 for
45           EVP_MAC_BLAKE2S or between 1 and 64 for EVP_MAC_BLAKE2B.  It is 32
46           and 64 respectively by default.
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48       "block-size" (OSSL_MAC_PARAM_SIZE) <unsigned integer>
49           Gets the MAC block size.  By default, it is 64 for EVP_MAC_BLAKE2S
50           and 128 for EVP_MAC_BLAKE2B.
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SEE ALSO

53       EVP_MAC_CTX_get_params(3), EVP_MAC_CTX_set_params(3), "PARAMETERS" in
54       EVP_MAC(3), OSSL_PARAM(3)
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HISTORY

57       The macros and functions described here were added to OpenSSL 3.0.
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60       Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
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62       Licensed under the Apache License 2.0 (the "License").  You may not use
63       this file except in compliance with the License.  You can obtain a copy
64       in the file LICENSE in the source distribution or at
65       <https://www.openssl.org/source/license.html>.
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693.0.9                             2023-07-27             EVP_MAC-BLAKE2(7ossl)
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