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.IX Title &quot;EVP_SHA1 3&quot;
.TH EVP_SHA1 3 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
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.SH &quot;NAME&quot;
EVP_sha1 \&amp;\- SHA\-1 For EVP
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/evp.h&gt;
\&amp;
\&amp; const EVP_MD *EVP_sha1(void);
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
\&amp;\s-1SHA\-1\s0 (Secure Hash Algorithm 1) is a cryptographic hash function standardized
in \s-1NIST FIPS 180\-4.\s0 The algorithm was designed by the United States National
Security Agency and initially published in 1995.
.IP &quot;\fBEVP_sha1()\fR&quot; 4
.IX Item &quot;EVP_sha1()&quot;
The \s-1SHA\-1\s0 algorithm which produces a 160\-bit output from a given input.
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
These functions return a \fB\s-1EVP_MD\s0\fR structure that contains the
implementation of the symmetric cipher. See \fBEVP_MD_meth_new\fR\|(3) for
details of the \fB\s-1EVP_MD\s0\fR structure.
.SH &quot;CONFORMING TO&quot;
.IX Header &quot;CONFORMING TO&quot;
\&amp;\s-1NIST FIPS 180\-4.\s0
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBevp\fR\|(7),
\&amp;\fBEVP_DigestInit\fR\|(3)
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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