| =pod |
| |
| =head1 NAME |
| |
| EVP_sha224, |
| EVP_sha256, |
| EVP_sha512_224, |
| EVP_sha512_256, |
| 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_sha512_224(void); |
| const EVP_MD *EVP_sha512_256(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_sha512_224, |
| EVP_sha512_256, |
| EVP_sha384(), |
| EVP_sha512() |
| |
| The SHA-2 SHA-224, SHA-256, SHA-512/224, SHA512/256, SHA-384 and SHA-512 |
| algorithms, which generate 224, 256, 224, 256, 384 and 512 bits |
| respectively of output from a given input. |
| |
| The two algorithms: SHA-512/224 and SHA512/256 are truncated forms of the |
| SHA-512 algorithm. They are distinct from SHA-224 and SHA-256 even though |
| their outputs are of the same size. |
| |
| =back |
| |
| |
| =head1 RETURN VALUES |
| |
| These functions return a B<EVP_MD> structure that contains the |
| implementation of the message digest. 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 2017-2022 The OpenSSL Project Authors. All Rights Reserved. |
| |
| Licensed under the Apache License 2.0 (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 |
| |
