EVP_SHA1(3ssl)                      OpenSSL                     EVP_SHA1(3ssl)


NAME
       EVP_sha1 - SHA-1 For EVP

SYNOPSIS
        #include <openssl/evp.h>

        const EVP_MD *EVP_sha1(void);

DESCRIPTION
       SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function
       standardized in NIST FIPS 180-4. The algorithm was designed by the
       United States National Security Agency and initially published in 1995.

       EVP_sha1()
           The SHA-1 algorithm which produces a 160-bit output from a given
           input.

NOTES
       Developers should be aware of the negative performance implications of
       calling this function multiple times and should consider using
       EVP_MD_fetch(3) with EVP_MD-SHA1(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>.

3.2.1                             2024-01-30                    EVP_SHA1(3ssl)