#include <openssl/evp.h>
 const EVP_MD *EVP_sha1(void);
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.
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.
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.
evp(7), EVP_DigestInit(3)
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>.