mirror of https://github.com/openssl/openssl
92 lines
2.4 KiB
Plaintext
92 lines
2.4 KiB
Plaintext
=pod
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=head1 NAME
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EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC
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- The BLAKE2 EVP_MAC implementations
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=head1 DESCRIPTION
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Support for computing BLAKE2 MACs through the B<EVP_MAC> API.
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=head2 Identity
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These implementations are identified with one of these names and
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properties, to be used with EVP_MAC_fetch():
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=over 4
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=item "BLAKE2BMAC", "provider=default"
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=item "BLAKE2SMAC", "provider=default"
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=back
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=head2 Supported parameters
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The general description of these parameters can be found in
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L<EVP_MAC(3)/PARAMETERS>.
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All these parameters (except for "block-size") can be set with
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EVP_MAC_CTX_set_params().
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Furthermore, the "size" parameter can be retrieved with
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EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_mac_size().
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The length of the "size" parameter should not exceed that of a B<size_t>.
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Likewise, the "block-size" parameter can be retrieved with
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EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_block_size().
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=over 4
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=item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string>
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Sets the MAC key.
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It may be at most 64 bytes for BLAKE2BMAC or 32 for BLAKE2SMAC and at
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least 1 byte in both cases.
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Setting this parameter is identical to passing a I<key> to L<EVP_MAC_init(3)>.
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=item "custom" (B<OSSL_MAC_PARAM_CUSTOM>) <octet string>
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Sets the customization/personalization string.
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It is an optional value of at most 16 bytes for BLAKE2BMAC or 8 for
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BLAKE2SMAC, and is empty by default.
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=item "salt" (B<OSSL_MAC_PARAM_SALT>) <octet string>
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Sets the salt.
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It is an optional value of at most 16 bytes for BLAKE2BMAC or 8 for
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BLAKE2SMAC, and is empty by default.
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=item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer>
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Sets the MAC size.
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It can be any number between 1 and 32 for EVP_MAC_BLAKE2S or between 1
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and 64 for EVP_MAC_BLAKE2B.
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It is 32 and 64 respectively by default.
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=item "block-size" (B<OSSL_MAC_PARAM_BLOCK_SIZE>) <unsigned integer>
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Gets the MAC block size.
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It is 64 for EVP_MAC_BLAKE2S and 128 for EVP_MAC_BLAKE2B.
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=back
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=head1 SEE ALSO
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L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>,
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L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)>
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=head1 HISTORY
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The macros and functions described here were added to OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
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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
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