xref: /openssl/doc/man3/EVP_sha1.pod (revision b6eb95fa)
1=pod
2
3=head1 NAME
4
5EVP_sha1
6- SHA-1 For EVP
7
8=head1 SYNOPSIS
9
10 #include <openssl/evp.h>
11
12 const EVP_MD *EVP_sha1(void);
13
14=head1 DESCRIPTION
15
16SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function standardized
17in NIST FIPS 180-4. The algorithm was designed by the United States National
18Security Agency and initially published in 1995.
19
20=over 4
21
22=item EVP_sha1()
23
24The SHA-1 algorithm which produces a 160-bit output from a given input.
25
26=back
27
28=head1 NOTES
29
30Developers should be aware of the negative performance implications of
31calling this function multiple times and should consider using
32L<EVP_MD_fetch(3)> with L<EVP_MD-SHA1(7)> instead.
33See L<crypto(7)/Performance> for further information.
34
35=head1 RETURN VALUES
36
37These functions return a B<EVP_MD> structure that contains the
38implementation of the message digest. See L<EVP_MD_meth_new(3)> for
39details of the B<EVP_MD> structure.
40
41=head1 CONFORMING TO
42
43NIST FIPS 180-4.
44
45=head1 SEE ALSO
46
47L<evp(7)>,
48L<EVP_DigestInit(3)>
49
50=head1 COPYRIGHT
51
52Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.
53
54Licensed under the Apache License 2.0 (the "License").  You may not use
55this file except in compliance with the License.  You can obtain a copy
56in the file LICENSE in the source distribution or at
57L<https://www.openssl.org/source/license.html>.
58
59=cut
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61