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