=pod

=head1 NAME

EVP_sha224,
EVP_sha256,
EVP_sha384,
EVP_sha512
- SHA-2 For EVP

=head1 SYNOPSIS

 #include <openssl/evp.h>

 const EVP_MD *EVP_sha224(void);
 const EVP_MD *EVP_sha256(void);
 const EVP_MD *EVP_sha384(void);
 const EVP_MD *EVP_sha512(void);

=head1 DESCRIPTION

SHA-2 (Secure Hash Algorithm 2) is a family of cryptographic hash functions
standardized in NIST FIPS 180-4, first published in 2001.

=over 4

=item EVP_sha224(),
EVP_sha256(),
EVP_sha384(),
EVP_sha512()

The SHA-2 SHA-224, SHA-256, SHA-384, SHA-512 algorithms respectively, which
generates 224, 256, 384 and 512 bits of output from a given input.

=back


=head1 RETURN VALUES

These functions return a B<EVP_MD> structure that contains the
implementation of the symmetric cipher. See L<EVP_MD_meth_new(3)> for
details of the B<EVP_MD> structure.

=head1 CONFORMING TO

NIST FIPS 180-4.

=head1 SEE ALSO

L<evp(7)>,
L<EVP_DigestInit(3)>

=head1 COPYRIGHT

Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut

