=pod =head1 NAME EVP_MD-BLAKE2 - The BLAKE2 EVP_MD implementation =head1 DESCRIPTION Support for computing BLAKE2 digests through the B API. =head2 Identities This implementation is only available with the default provider, and includes the following varieties: =over 4 =item BLAKE2S-256 Known names are "BLAKE2S-256" and "BLAKE2s256". =item BLAKE2B-512 Known names are "BLAKE2B-512" and "BLAKE2b512". =back =head2 Settable Parameters "BLAKE2B-512" supports the following EVP_MD_CTX_set_params() key described in L. =over 4 =item "xoflen" (B) =back =head2 Gettable Parameters This implementation supports the common gettable parameters described in L. =head2 Settable Context Parameters The implementation supports the following L entries which are settable for an B with L or L: =over 4 =item "size" (B) Sets a different digest length for the L 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 L call to have an immediate effect. When set with L it will have an effect only if the B context is reinitialized. =back =head1 SEE ALSO L, L =head1 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. =head1 COPYRIGHT Copyright 2020-2022 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 L. =cut