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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.

RETURN VALUES

       These functions return a EVP_MD structure that contains the implementation of the
       symmetric cipher. 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 2017-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (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>.