NAME

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

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);

DESCRIPTION

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

       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.

NOTES

       Developers should be aware of the negative performance implications of calling these
       functions multiple times and should consider using EVP_MD_fetch(3) with
       EVP_MD-SHA2(7)instead.  See "Performance" in crypto(7) for further information.

RETURN VALUES

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

CONFORMING TO

       NIST FIPS 180-4.

SEE ALSO

       evp(7), EVP_DigestInit(3)

COPYRIGHT

       Copyright 2017-2023 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 <https://www.openssl.org/source/license.html>.