EVP_PKEY-HMAC
Section: OpenSSL (7SSL)
Updated: 2024-03-03
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NAME
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash,
EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC
- EVP_PKEY legacy MAC keytypes and algorithm support
DESCRIPTION
The HMAC and CMAC key types are implemented in OpenSSL's default and FIPS
providers. Additionally the Siphash and Poly1305 key types are implemented
in the default provider. Performing MAC operations via an EVP_PKEY
is considered legacy and are only available for backwards compatibility purposes
and for a restricted set of algorithms. The preferred way of performing MAC
operations is via the EVP_MAC APIs. See EVP_MAC_init(3).
For further details on using EVP_PKEY based MAC keys see
EVP_SIGNATURE-HMAC(7), EVP_SIGNATURE-Siphash(7),
EVP_SIGNATURE-Poly1305(7) or EVP_SIGNATURE-CMAC(7).
Common MAC parameters
All the MAC keytypes support the following parameters.
- "priv" (OSSL_PKEY_PARAM_PRIV_KEY) <octet string>
-
The MAC key value.
- "properties" (OSSL_PKEY_PARAM_PROPERTIES) <UTF8 string>
-
A property query string to be used when any algorithms are fetched.
CMAC parameters
As well as the parameters described above, the CMAC keytype additionally
supports the following parameters.
- "cipher" (OSSL_PKEY_PARAM_CIPHER) <UTF8 string>
-
The name of a cipher to be used when generating the MAC.
- "engine" (OSSL_PKEY_PARAM_ENGINE) <UTF8 string>
-
The name of an engine to be used for the specified cipher (if any).
Common MAC key generation parameters
MAC key generation is unusual in that no new key is actually generated. Instead
a new provider side key object is created with the supplied raw key value. This
is done for backwards compatibility with previous versions of OpenSSL.
- "priv" (OSSL_PKEY_PARAM_PRIV_KEY) <octet string>
-
The MAC key value.
CMAC key generation parameters
In addition to the common MAC key generation parameters, the CMAC key generation
additionally recognises the following.
- "cipher" (OSSL_PKEY_PARAM_CIPHER) <UTF8 string>
-
The name of a cipher to be used when generating the MAC.
SEE ALSO
EVP_KEYMGMT(3), EVP_PKEY(3), provider-keymgmt(7)
COPYRIGHT
Copyright 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>.
Index
- NAME
-
- DESCRIPTION
-
- Common MAC parameters
-
- CMAC parameters
-
- Common MAC key generation parameters
-
- CMAC key generation parameters
-
- SEE ALSO
-
- COPYRIGHT
-
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