.\" $NetBSD: EVP_sha224.3,v 1.5 2023/05/31 19:42:42 christos Exp $
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.\" ========================================================================
.\"
.IX Title "EVP_sha224 3"
.TH EVP_sha224 3 "2023-05-31" "3.0.9" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
EVP_sha224,
EVP_sha256,
EVP_sha512_224,
EVP_sha512_256,
EVP_sha384,
EVP_sha512
\&\- SHA\-2 For EVP
.SH "LIBRARY"
libcrypto, -lcrypto
.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 "\fBEVP_sha224()\fR, \fBEVP_sha256()\fR, EVP_sha512_224, EVP_sha512_256, \fBEVP_sha384()\fR, \fBEVP_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 "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) 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 180\-4.\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>.