EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC - The BLAKE2 EVP_MAC implementations
Support for computing BLAKE2 MACs through the EVP_MAC API.
These implementations are identified with one of these names and properties, to be used with EVP_MAC_fetch():
- "BLAKE2BMAC", "provider=default"
- "BLAKE2SMAC", "provider=default"
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_CTX_get_mac_size(). The length of the "size" parameter should not exceed that of a size_t. Likewise, the "block-size" parameter can be retrieved with EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_block_size().
- "key" (OSSL_MAC_PARAM_KEY) <octet string>
Sets the MAC key. It may be at most 64 bytes for BLAKE2BMAC or 32 for BLAKE2SMAC and at least 1 byte in both cases. Setting this parameter is identical to passing a key to EVP_MAC_init(3).
- "custom" (OSSL_MAC_PARAM_CUSTOM) <octet string>
Sets the custom value. It is an optional value of at most 16 bytes for BLAKE2BMAC or 8 for BLAKE2SMAC, and is empty by default.
- "salt" (OSSL_MAC_PARAM_SALT) <octet string>
Sets the salt. It is an optional value of at most 16 bytes for BLAKE2BMAC or 8 for BLAKE2SMAC, and is empty by default.
- "size" (OSSL_MAC_PARAM_SIZE) <unsigned integer>
Sets the MAC size. It can be any number between 1 and 32 for EVP_MAC_BLAKE2S or between 1 and 64 for EVP_MAC_BLAKE2B. It is 32 and 64 respectively by default.
- "block-size" (OSSL_MAC_PARAM_SIZE) <unsigned integer>
Gets the MAC block size. By default, it is 64 for EVP_MAC_BLAKE2S and 128 for EVP_MAC_BLAKE2B.
The macros and functions described here were added to OpenSSL 3.0.
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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.