Android_verify/third_party/android-libs/share/man/man3/EVP_sha3_224.3ossl

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.\" ========================================================================
.\"
.IX Title "EVP_SHA3_224 3ossl"
.TH EVP_SHA3_224 3ossl "2024-09-03" "3.3.2" "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_sha3_224,
EVP_sha3_256,
EVP_sha3_384,
EVP_sha3_512,
EVP_shake128,
EVP_shake256
\&\- SHA\-3 For EVP
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& const EVP_MD *EVP_sha3_224(void);
\& const EVP_MD *EVP_sha3_256(void);
\& const EVP_MD *EVP_sha3_384(void);
\& const EVP_MD *EVP_sha3_512(void);
\&
\& const EVP_MD *EVP_shake128(void);
\& const EVP_MD *EVP_shake256(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1SHA\-3\s0 (Secure Hash Algorithm 3) is a family of cryptographic hash functions
standardized in \s-1NIST FIPS 202,\s0 first published in 2015. It is based on the
Keccak algorithm.
.IP "\fBEVP_sha3_224()\fR, \fBEVP_sha3_256()\fR, \fBEVP_sha3_384()\fR, \fBEVP_sha3_512()\fR" 4
.IX Item "EVP_sha3_224(), EVP_sha3_256(), EVP_sha3_384(), EVP_sha3_512()"
The \s-1SHA\-3 SHA\-3\-224, SHA\-3\-256, SHA\-3\-384,\s0 and \s-1SHA\-3\-512\s0 algorithms
respectively. They produce 224, 256, 384 and 512 bits of output from a given
input.
.IP "\fBEVP_shake128()\fR, \fBEVP_shake256()\fR" 4
.IX Item "EVP_shake128(), EVP_shake256()"
The \s-1SHAKE\-128\s0 and \s-1SHAKE\-256\s0 Extendable Output Functions (\s-1XOF\s0) that can generate
a variable hash length.
.Sp
Specifically, \fBEVP_shake128\fR provides an overall security of 128 bits, while
\&\fBEVP_shake256\fR provides that of 256 bits.
.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 \s-1\fBEVP_MD\-SHA3\s0\fR\|(7) or \s-1\fBEVP_MD\-SHAKE\s0\fR\|(7) instead.
See \*(L"Performance\*(R" in \fBcrypto\fR\|(7) for further information.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return a \fB\s-1EVP_MD\s0\fR structure that contains the
implementation of the message digest. See \fBEVP_MD_meth_new\fR\|(3) for
details of the \fB\s-1EVP_MD\s0\fR structure.
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1NIST FIPS 202.\s0
.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 \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.