EVP_sha224(3) - NetBSD Manual Pages

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EVP_sha224(3)                       OpenSSL                      EVP_sha224(3)




NAME

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


LIBRARY

       libcrypto, -lcrypto


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>.



3.0.12                            2023-10-25                     EVP_sha224(3)