✏ 编辑: EVP_sha224.3

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.IX Title "EVP_SHA224 3"
.TH EVP_SHA224 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
EVP_sha224, EVP_sha256, EVP_sha512_224, EVP_sha512_256, EVP_sha384, EVP_sha512 \&\- SHA\-2 For EVP
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& const EVP_MD *EVP_sha224(void);
\& const EVP_MD *EVP_sha256(void);
\& const EVP_MD *EVP_sha512_224(void);
\& const EVP_MD *EVP_sha512_256(void);
\& const EVP_MD *EVP_sha384(void);
\& const EVP_MD *EVP_sha512(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1SHA\-2 \s0(Secure Hash Algorithm 2) is a family of cryptographic hash functions
standardized in \s-1NIST FIPS 180\-4,\s0 first published in 2001.
.IP "\fIEVP_sha224()\fR, \fIEVP_sha256()\fR, EVP_sha512_224, EVP_sha512_256, \fIEVP_sha384()\fR, \fIEVP_sha512()\fR" 4
.IX Item "EVP_sha224(), EVP_sha256(), EVP_sha512_224, EVP_sha512_256, EVP_sha384(), EVP_sha512()"
The \s-1SHA\-2 SHA\-224, SHA\-256, SHA\-512/224, SHA512/256, SHA\-384\s0 and \s-1SHA\-512\s0
algorithms, which generate 224, 256, 224, 256, 384 and 512 bits
respectively of output from a given input.
.Sp
The two algorithms: \s-1SHA\-512/224\s0 and \s-1SHA512/256\s0 are truncated forms of the
\&\s-1SHA\-512\s0 algorithm. They are distinct from \s-1SHA\-224\s0 and \s-1SHA\-256\s0 even though
their outputs are of the same size.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return a \fB\s-1EVP_MD\s0\fR structure that contains the
implementation of the symmetric cipher. See \fIEVP_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 180\-4.\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIevp\fR\|(7),
\&\fIEVP_DigestInit\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.

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