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- .\" -*- mode: troff; coding: utf-8 -*-
- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
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- .IX Title "EVP_BLAKE2B512 3ossl"
- .TH EVP_BLAKE2B512 3ossl 2025-01-17 3.4.0 OpenSSL
- .\" For nroff, turn off justification. Always turn off hyphenation; it makes
- .\" way too many mistakes in technical documents.
- .if n .ad l
- .nh
- .SH NAME
- EVP_blake2b512,
- EVP_blake2s256
- \&\- BLAKE2 For EVP
- .SH SYNOPSIS
- .IX Header "SYNOPSIS"
- .Vb 1
- \& #include <openssl/evp.h>
- \&
- \& const EVP_MD *EVP_blake2b512(void);
- \& const EVP_MD *EVP_blake2s256(void);
- .Ve
- .SH DESCRIPTION
- .IX Header "DESCRIPTION"
- BLAKE2 is an improved version of BLAKE, which was submitted to the NIST SHA\-3
- algorithm competition. The BLAKE2s and BLAKE2b algorithms are described in
- RFC 7693.
- .IP \fBEVP_blake2s256()\fR 4
- .IX Item "EVP_blake2s256()"
- The BLAKE2s algorithm that produces a 256\-bit output from a given input.
- .IP \fBEVP_blake2b512()\fR 4
- .IX Item "EVP_blake2b512()"
- The BLAKE2b algorithm that produces a 512\-bit output from a given input.
- .SH NOTES
- .IX Header "NOTES"
- Developers should be aware of the negative performance implications of
- calling these functions multiple times and should consider using
- \&\fBEVP_MD_fetch\fR\|(3) with \fBEVP_MD\-BLAKE2\fR\|(7) instead.
- See "Performance" in \fBcrypto\fR\|(7) for further information.
- .PP
- Both algorithms support a variable-length digest,
- but this is only available through \fBEVP_MD\-BLAKE2\fR\|(7).
- .SH "RETURN VALUES"
- .IX Header "RETURN VALUES"
- These functions return a \fBEVP_MD\fR structure that contains the
- implementation of the message digest. See \fBEVP_MD_meth_new\fR\|(3) for
- details of the \fBEVP_MD\fR structure.
- .SH "CONFORMING TO"
- .IX Header "CONFORMING TO"
- RFC 7693.
- .SH "SEE ALSO"
- .IX Header "SEE ALSO"
- \&\fBevp\fR\|(7),
- \&\fBEVP_DigestInit\fR\|(3)
- .SH COPYRIGHT
- .IX Header "COPYRIGHT"
- Copyright 2017\-2023 The OpenSSL Project Authors. All Rights Reserved.
- .PP
- 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>.
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