| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | =pod |
| 2 | |
| 3 | =head1 NAME |
| 4 | |
| 5 | EVP_sha224, |
| 6 | EVP_sha256, |
| 7 | EVP_sha512_224, |
| 8 | EVP_sha512_256, |
| 9 | EVP_sha384, |
| 10 | EVP_sha512 |
| 11 | - SHA-2 For EVP |
| 12 | |
| 13 | =head1 SYNOPSIS |
| 14 | |
| 15 | #include <openssl/evp.h> |
| 16 | |
| 17 | const EVP_MD *EVP_sha224(void); |
| 18 | const EVP_MD *EVP_sha256(void); |
| 19 | const EVP_MD *EVP_sha512_224(void); |
| 20 | const EVP_MD *EVP_sha512_256(void); |
| 21 | const EVP_MD *EVP_sha384(void); |
| 22 | const EVP_MD *EVP_sha512(void); |
| 23 | |
| 24 | =head1 DESCRIPTION |
| 25 | |
| 26 | SHA-2 (Secure Hash Algorithm 2) is a family of cryptographic hash functions |
| 27 | standardized in NIST FIPS 180-4, first published in 2001. |
| 28 | |
| 29 | =over 4 |
| 30 | |
| 31 | =item EVP_sha224(), |
| 32 | EVP_sha256(), |
| 33 | EVP_sha512_224, |
| 34 | EVP_sha512_256, |
| 35 | EVP_sha384(), |
| 36 | EVP_sha512() |
| 37 | |
| 38 | The SHA-2 SHA-224, SHA-256, SHA-512/224, SHA512/256, SHA-384 and SHA-512 |
| 39 | algorithms, which generate 224, 256, 224, 256, 384 and 512 bits |
| 40 | respectively of output from a given input. |
| 41 | |
| 42 | The two algorithms: SHA-512/224 and SHA512/256 are truncated forms of the |
| 43 | SHA-512 algorithm. They are distinct from SHA-224 and SHA-256 even though |
| 44 | their outputs are of the same size. |
| 45 | |
| 46 | =back |
| 47 | |
| 48 | |
| 49 | =head1 RETURN VALUES |
| 50 | |
| 51 | These functions return a B<EVP_MD> structure that contains the |
| 52 | implementation of the symmetric cipher. See L<EVP_MD_meth_new(3)> for |
| 53 | details of the B<EVP_MD> structure. |
| 54 | |
| 55 | =head1 CONFORMING TO |
| 56 | |
| 57 | NIST FIPS 180-4. |
| 58 | |
| 59 | =head1 SEE ALSO |
| 60 | |
| 61 | L<evp(7)>, |
| 62 | L<EVP_DigestInit(3)> |
| 63 | |
| 64 | =head1 COPYRIGHT |
| 65 | |
| 66 | Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved. |
| 67 | |
| 68 | Licensed under the OpenSSL license (the "License"). You may not use |
| 69 | this file except in compliance with the License. You can obtain a copy |
| 70 | in the file LICENSE in the source distribution or at |
| 71 | L<https://www.openssl.org/source/license.html>. |
| 72 | |
| 73 | =cut |
| 74 | |