=pod
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=head1 NAME
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EVP_sha224,
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EVP_sha256,
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EVP_sha512_224,
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EVP_sha512_256,
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EVP_sha384,
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EVP_sha512
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- SHA-2 For EVP
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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const EVP_MD *EVP_sha224(void);
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const EVP_MD *EVP_sha256(void);
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const EVP_MD *EVP_sha512_224(void);
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const EVP_MD *EVP_sha512_256(void);
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const EVP_MD *EVP_sha384(void);
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const EVP_MD *EVP_sha512(void);
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=head1 DESCRIPTION
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SHA-2 (Secure Hash Algorithm 2) is a family of cryptographic hash functions
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standardized in NIST FIPS 180-4, first published in 2001.
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=over 4
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=item EVP_sha224(),
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EVP_sha256(),
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EVP_sha512_224,
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EVP_sha512_256,
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EVP_sha384(),
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EVP_sha512()
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The SHA-2 SHA-224, SHA-256, SHA-512/224, SHA512/256, SHA-384 and SHA-512
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algorithms, which generate 224, 256, 224, 256, 384 and 512 bits
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respectively of output from a given input.
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The two algorithms: SHA-512/224 and SHA512/256 are truncated forms of the
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SHA-512 algorithm. They are distinct from SHA-224 and SHA-256 even though
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their outputs are of the same size.
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=back
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=head1 RETURN VALUES
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These functions return a B<EVP_MD> structure that contains the
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implementation of the symmetric cipher. See L<EVP_MD_meth_new(3)> for
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details of the B<EVP_MD> structure.
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=head1 CONFORMING TO
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NIST FIPS 180-4.
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=head1 SEE ALSO
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L<evp(7)>,
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L<EVP_DigestInit(3)>
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=head1 COPYRIGHT
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Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (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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