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84 lines
2.2 KiB
Plaintext
84 lines
2.2 KiB
Plaintext
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=pod
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=head1 NAME
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EVP_MD-SHAKE, EVP_MD-KECCAK-KMAC
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- The SHAKE / KECCAK family EVP_MD implementations
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=head1 DESCRIPTION
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Support for computing SHAKE or KECCAK-KMAC digests through the
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B<EVP_MD> API.
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KECCAK-KMAC is a special digest that's used by the KMAC EVP_MAC
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implementation (see L<EVP_MAC-KMAC(7)>).
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=head2 Identities
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This implementation is available in the FIPS provider as well as the default
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provider, and includes the following varieties:
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=over 4
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=item KECCAK-KMAC-128
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Known names are "KECCAK-KMAC-128" and "KECCAK-KMAC128"
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This is used by L<EVP_MAC-KMAC128(7)>
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=item KECCAK-KMAC-256
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Known names are "KECCAK-KMAC-256" and "KECCAK-KMAC256"
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This is used by L<EVP_MAC-KMAC256(7)>
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=item SHAKE-128
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Known names are "SHAKE-128" and "SHAKE128"
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=item SHAKE-256
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Known names are "SHAKE-256" and "SHAKE256"
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=back
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=head2 Gettable Parameters
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This implementation supports the common gettable parameters described
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in L<EVP_MD-common(7)>.
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=head2 Settable Context Parameters
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These implementations support the following L<OSSL_PARAM(3)> entries,
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settable for an B<EVP_MD_CTX> with L<EVP_MD_CTX_set_params(3)>:
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=over 4
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=item "xoflen" (B<OSSL_DIGEST_PARAM_XOFLEN>) <unsigned integer>
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Sets the digest length for extendable output functions.
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The length of the "xoflen" parameter should not exceed that of a B<size_t>.
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For backwards compatibility reasons the default xoflen length for SHAKE-128 is
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16 (bytes) which results in a security strength of only 64 bits. To ensure the
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maximum security strength of 128 bits, the xoflen should be set to at least 32.
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For backwards compatibility reasons the default xoflen length for SHAKE-256 is
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32 (bytes) which results in a security strength of only 128 bits. To ensure the
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maximum security strength of 256 bits, the xoflen should be set to at least 64.
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=back
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=head1 SEE ALSO
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L<EVP_MD_CTX_set_params(3)>, L<provider-digest(7)>, L<OSSL_PROVIDER-default(7)>
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=head1 COPYRIGHT
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Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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