EVP_MD-BLAKE2(7SSL) OpenSSL EVP_MD-BLAKE2(7SSL)
NAME
EVP_MD-BLAKE2 - The BLAKE2 EVP_MD implementation
DESCRIPTION
Support for computing BLAKE2 digests through the EVP_MD API.
Identities
This implementation is only available with the default provider, and
includes the following varieties:
BLAKE2S-256
Known names are "BLAKE2S-256" and "BLAKE2s256".
BLAKE2B-512
Known names are "BLAKE2B-512" and "BLAKE2b512".
Settable Parameters
"BLAKE2B-512" supports the following EVP_MD_CTX_set_params() key
described in "PARAMETERS" in EVP_DigestInit(3).
"size" (OSSL_DIGEST_PARAM_SIZE) <unsigned integer>
Gettable Parameters
This implementation supports the common gettable parameters described in
EVP_MD-common(7).
Settable Context Parameters
The implementation supports the following OSSL_PARAM(3) entries which
are settable for an EVP_MD_CTX with EVP_DigestInit_ex2(3) or
EVP_MD_CTX_set_params(3):
"size" (OSSL_DIGEST_PARAM_SIZE) <unsigned integer>
Sets a different digest length for the EVP_DigestFinal(3) output.
The value of the "size" parameter must not exceed the default digest
length of the respective BLAKE2 algorithm variants, 64 for
BLAKE2B-512 and 32 for BLAKE2S-256. The parameter must be set with
the EVP_DigestInit_ex2(3) call to have an immediate effect. When set
with EVP_MD_CTX_set_params(3) it will have an effect only if the
EVP_MD_CTX context is reinitialized.
SEE ALSO
provider-digest(7), OSSL_PROVIDER-default(7)
HISTORY
This functionality was added in OpenSSL 3.0.
The variable size support was added in OpenSSL 3.2 for BLAKE2B-512 and
in OpenSSL 3.3 for BLAKE2S-256.
COPYRIGHT
Copyright 2020-2024 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>.
3.5.4 2025-09-30 EVP_MD-BLAKE2(7SSL)
Generated by dwww version 1.16 on Tue Dec 16 04:21:16 CET 2025.