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Title "EVP_MD-BLAKE2 7ossl"
way too many mistakes in technical documents.
Automatically generated by Pod::Man 5.0102 (Pod::Simple 3.45)
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. ds C` "" . ds C' "" 'br\} . ds C` . ds C' 'br\}
Escape single quotes in literal strings from groff's Unicode transform.
If the F register is >0, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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Avoid warning from groff about undefined register 'F'.
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Title "EVP_MD-BLAKE2 7ossl"
EVP_MD-BLAKE2 7ossl 2025-07-01 3.5.1 OpenSSL
For nroff, turn off justification. Always turn off hyphenation; it makesway too many mistakes in technical documents.
NAME
EVP_MD-BLAKE2 - The BLAKE2 EVP_MD implementation
DESCRIPTION
Header "DESCRIPTION" Support for computing BLAKE2 digests through the EVP_MD API.
Identities
Subsection "Identities" This implementation is only available with the default provider, and
includes the following varieties:
BLAKE2S-256 4
Item "BLAKE2S-256" Known names are "BLAKE2S-256" and "BLAKE2s256".
BLAKE2B-512 4
Item "BLAKE2B-512" Known names are "BLAKE2B-512" and "BLAKE2b512".
"Settable Parameters"
Subsection "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>" 4
Item """size"" (OSSL_DIGEST_PARAM_SIZE) <unsigned integer>" "Gettable Parameters"
Subsection "Gettable Parameters" This implementation supports the common gettable parameters described
in EVP_MD-common\|(7).
"Settable Context Parameters"
Subsection "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
\fBEVP_MD_CTX_set_params\|(3):
"""size"" (OSSL_DIGEST_PARAM_SIZE) <unsigned integer>" 4
Item """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
\fBEVP_DigestInit_ex2\|(3) call to have an immediate effect. When set with
\fBEVP_MD_CTX_set_params\|(3) it will have an effect only if the EVP_MD_CTX
context is reinitialized.
"SEE ALSO"
Header "SEE ALSO" \fBprovider-digest\|(7), OSSL_PROVIDER-default\|(7)
HISTORY
Header "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
Header "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>.