'\" t
.\"     Title: kcapi_pad_iv
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: November 2020
.\"    Manual: Programming Interface
.\"    Source: libkcapi Manual 1.2.1
.\"  Language: English
.\"
.TH "KCAPI_PAD_IV" "3" "November 2020" "libkcapi Manual 1\&.2\&.1" "Programming Interface"
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.SH "NAME"
kcapi_pad_iv \- realign the IV as necessary for cipher
.SH "SYNOPSIS"
.HP \w'int\ kcapi_pad_iv('u
.BI "int kcapi_pad_iv(struct\ kcapi_handle\ *\ " "handle" ", const\ uint8_t\ *\ " "iv" ", uint32_t\ " "ivlen" ", uint8_t\ **\ " "newiv" ", uint32_t\ *\ " "newivlen" ");"
.SH "ARGUMENTS"
.PP
\fIhandle\fR
.RS 4
[in] cipher handle
.RE
.PP
\fIiv\fR
.RS 4
[in] current IV buffer
.RE
.PP
\fIivlen\fR
.RS 4
[in] length of IV buffer
.RE
.PP
\fInewiv\fR
.RS 4
[out] buffer of aligned IV
.RE
.PP
\fInewivlen\fR
.RS 4
[out] length of newly aligned IV
.RE
.SH "DESCRIPTION"
.PP
The function pads the least significant bits of the provided IV up to the block size of the cipher with zeros\&. In case the provided IV is longer than the block size, the least significant bits are truncated to the block size\&.
.PP
The function allocates memory for newiv in case the return code indicates success\&. The consumer must free the memory after use\&.
.PP
\fIreturn\fR
0 for success; a negative errno\-style error code if an error occurred
.SH "AUTHOR"
.PP
\fBStephan Mueller\fR <\&smueller@chronox.de\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br