'\" t
.\"     Title: kcapi_md_hmac_sha1
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: April 2024
.\"    Manual: Programming Interface
.\"    Source: libkcapi Manual 1.4.0
.\"  Language: English
.\"
.TH "KCAPI_MD_HMAC_SHA1" "3" "April 2024" "libkcapi Manual 1\&.4\&.0" "Programming Interface"
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.SH "NAME"
kcapi_md_hmac_sha1 \- HMAC SHA\-1 keyed message digest on one buffer
.SH "SYNOPSIS"
.HP \w'ssize_t\ kcapi_md_hmac_sha1('u
.BI "ssize_t kcapi_md_hmac_sha1(const\ uint8_t\ *\ " "key" ", uint32_t\ " "keylen" ", const\ uint8_t\ *\ " "in" ", size_t\ " "inlen" ", uint8_t\ *\ " "out" ", size_t\ " "outlen" ");"
.SH "ARGUMENTS"
.PP
\fIkey\fR
.RS 4
[in] buffer with HMAC key
.RE
.PP
\fIkeylen\fR
.RS 4
[in] length of HMAC key buffer
.RE
.PP
\fIin\fR
.RS 4
[in] buffer with input data
.RE
.PP
\fIinlen\fR
.RS 4
[in] length of input buffer
.RE
.PP
\fIout\fR
.RS 4
[out] buffer for message digest
.RE
.PP
\fIoutlen\fR
.RS 4
[in] length of out
.RE
.SH "DESCRIPTION"
.PP
With this one\-shot convenience function, a keyed message digest of the given buffer is generated\&. The output buffer must be allocated by the caller and have at least the length of the message digest size for the chosen keyed message digest\&.
.PP
\fIreturn\fR
size of message digest upon success; \-EIO \- data cannot be obtained; \-ENOMEM \- buffer is too small for the complete message digest, the buffer is filled with the truncated message digest
.SH "AUTHOR"
.PP
\fBStephan Mueller\fR <\&smueller@chronox.de\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br