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Title "EVP_MAC-BLAKE2 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC \- The BLAKE2 EVP_MAC implementations Header "DESCRIPTION" Support for computing \s-1BLAKE2\s0 MACs through the \s-1EVP_MAC\s0 \s-1API.\s0 Subsection "Identity" These implementations are identified with one of these names and properties, to be used with EVP_MAC_fetch(): Item "BLAKE2BMAC, provider=default"

0 Item "BLAKE2SMAC, provider=default"

Subsection "Supported parameters" The general description of these parameters can be found in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1EVP_MAC\s0\|(3).

All these parameters can be set with EVP_MAC_CTX_set_params(). Furthermore, the \*(L"size\*(R" parameter can be retrieved with \fBEVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_mac_size(). The length of the \*(L"size\*(R" parameter should not exceed that of a size_t. Likewise, the \*(L"block-size\*(R" parameter can be retrieved with \fBEVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_block_size(). Item "key (OSSL_MAC_PARAM_KEY) <octet string>" Sets the \s-1MAC\s0 key. It may be at most 64 bytes for \s-1BLAKE2BMAC\s0 or 32 for \s-1BLAKE2SMAC\s0 and at least 1 byte in both cases. Setting this parameter is identical to passing a key to EVP_MAC_init\|(3). Item "custom (OSSL_MAC_PARAM_CUSTOM) <octet string>" Sets the custom value. It is an optional value of at most 16 bytes for \s-1BLAKE2BMAC\s0 or 8 for \s-1BLAKE2SMAC,\s0 and is empty by default. Item "salt (OSSL_MAC_PARAM_SALT) <octet string>" Sets the salt. It is an optional value of at most 16 bytes for \s-1BLAKE2BMAC\s0 or 8 for \s-1BLAKE2SMAC,\s0 and is empty by default. Item "size (OSSL_MAC_PARAM_SIZE) <unsigned integer>" Sets the \s-1MAC\s0 size. It can be any number between 1 and 32 for \s-1EVP_MAC_BLAKE2S\s0 or between 1 and 64 for \s-1EVP_MAC_BLAKE2B.\s0 It is 32 and 64 respectively by default. Item "block-size (OSSL_MAC_PARAM_SIZE) <unsigned integer>" Gets the \s-1MAC\s0 block size. By default, it is 64 for \s-1EVP_MAC_BLAKE2S\s0 and 128 for \s-1EVP_MAC_BLAKE2B.\s0

Header "SEE ALSO" \fBEVP_MAC_CTX_get_params\|(3), EVP_MAC_CTX_set_params\|(3), \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1EVP_MAC\s0\|(3), \s-1OSSL_PARAM\s0\|(3) Header "HISTORY" The macros and functions described here were added to OpenSSL 3.0. Header "COPYRIGHT" Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.