Android_verify/third_party/android-libs/share/man/man3/EVP_sha1.3ossl

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.\" ========================================================================
.\"
.IX Title "EVP_SHA1 3ossl"
.TH EVP_SHA1 3ossl "2024-09-03" "3.3.2" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
EVP_sha1
\&\- SHA\-1 For EVP
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& const EVP_MD *EVP_sha1(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\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 "\fBEVP_sha1()\fR" 4
.IX Item "EVP_sha1()"
The \s-1SHA\-1\s0 algorithm which produces a 160\-bit output from a given input.
.SH "NOTES"
.IX Header "NOTES"
Developers should be aware of the negative performance implications of
calling this function multiple times and should consider using
\&\fBEVP_MD_fetch\fR\|(3) with \s-1\fBEVP_MD\-SHA1\s0\fR\|(7) instead.
See \*(L"Performance\*(R" in \fBcrypto\fR\|(7) for further information.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return a \fB\s-1EVP_MD\s0\fR structure that contains the
implementation of the message digest. See \fBEVP_MD_meth_new\fR\|(3) for
details of the \fB\s-1EVP_MD\s0\fR structure.
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1NIST FIPS 180\-4.\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBevp\fR\|(7),
\&\fBEVP_DigestInit\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2023 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  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
<https://www.openssl.org/source/license.html>.