1EVP_SHA224(3ossl)                   OpenSSL                  EVP_SHA224(3ossl)
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NAME

6       EVP_sha224, EVP_sha256, EVP_sha512_224, EVP_sha512_256, EVP_sha384,
7       EVP_sha512 - SHA-2 For EVP
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SYNOPSIS

10        #include <openssl/evp.h>
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12        const EVP_MD *EVP_sha224(void);
13        const EVP_MD *EVP_sha256(void);
14        const EVP_MD *EVP_sha512_224(void);
15        const EVP_MD *EVP_sha512_256(void);
16        const EVP_MD *EVP_sha384(void);
17        const EVP_MD *EVP_sha512(void);
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DESCRIPTION

20       SHA-2 (Secure Hash Algorithm 2) is a family of cryptographic hash
21       functions standardized in NIST FIPS 180-4, first published in 2001.
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23       EVP_sha224(), EVP_sha256(), EVP_sha512_224, EVP_sha512_256,
24       EVP_sha384(), EVP_sha512()
25           The SHA-2 SHA-224, SHA-256, SHA-512/224, SHA512/256, SHA-384 and
26           SHA-512 algorithms, which generate 224, 256, 224, 256, 384 and 512
27           bits respectively of output from a given input.
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29           The two algorithms: SHA-512/224 and SHA512/256 are truncated forms
30           of the SHA-512 algorithm. They are distinct from SHA-224 and
31           SHA-256 even though their outputs are of the same size.
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NOTES

34       Developers should be aware of the negative performance implications of
35       calling these functions multiple times and should consider using
36       EVP_MD_fetch(3) instead.  See "Performance" in crypto(7) for further
37       information.
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RETURN VALUES

40       These functions return a EVP_MD structure that contains the
41       implementation of the message digest. See EVP_MD_meth_new(3) for
42       details of the EVP_MD structure.
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CONFORMING TO

45       NIST FIPS 180-4.
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SEE ALSO

48       evp(7), EVP_DigestInit(3)
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51       Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.
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53       Licensed under the Apache License 2.0 (the "License").  You may not use
54       this file except in compliance with the License.  You can obtain a copy
55       in the file LICENSE in the source distribution or at
56       <https://www.openssl.org/source/license.html>.
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603.1.1                             2023-08-31                 EVP_SHA224(3ossl)
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