man/zip_file_set_encryption.man

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.\" zip_file_set_encryption.mdoc -- set encryption method for file
.\" Copyright (C) 2016-2021 Dieter Baron and Thomas Klausner
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.TH "ZIP_FILE_SET_ENCRYPTION" "3" "April 2, 2020" "NiH" "Library Functions Manual"
.nh
.if n .ad l
.SH "NAME"
\fBzip_file_set_encryption\fR
\- set encryption method for file in zip
.SH "LIBRARY"
libzip (-lzip)
.SH "SYNOPSIS"
\fB#include <zip.h>\fR
.sp
\fIint\fR
.br
.PD 0
.HP 4n
\fBzip_file_set_encryption\fR(\fIzip_t\ *archive\fR, \fIzip_uint64_t\ index\fR, \fIzip_uint16_t\ method\fR, \fIconst\ char\ *password\fR);
.PD
.SH "DESCRIPTION"
The
\fBzip_file_set_encryption\fR()
function sets the encryption method for the file at position
\fIindex\fR
in the zip archive to
\fImethod\fR
using the password
\fIpassword\fR.
The
\fImethod\fR
is the same as returned by
zip_stat(3).
For the
\fImethod\fR
argument, currently only the following values are supported:
.TP 19n
\fRZIP_EM_NONE\fR
No encryption.
.TP 19n
\fRZIP_EM_AES_128\fR
Winzip AES-128 encryption.
.TP 19n
\fRZIP_EM_AES_192\fR
Winzip AES-192 encryption.
.TP 19n
\fRZIP_EM_AES_256\fR
Winzip AES-256 encryption.
.TP 19n
\fRZIP_EM_TRAD_PKWARE\fR
.br
Traditional PKWare encryption.
Do not use this method, it is not secure.
It is only provided for backwards compatibility.
.PP
If
\fIpassword\fR
is
\fRNULL\fR,
the default password provided by
zip_set_default_password(3)
is used.
.PP
The current encryption method for a file in a zip archive can be
determined using
zip_stat(3).
.SH "RETURN VALUES"
Upon successful completion 0 is returned.
Otherwise, \-1 is returned and the error information in
\fIarchive\fR
is set to indicate the error.
.SH "ERRORS"
\fBzip_file_set_encryption\fR()
fails if:
.TP 19n
[\fRZIP_ER_ENCRNOTSUPP\fR]
Unsupported compression method requested.
.TP 19n
[\fRZIP_ER_INVAL\fR]
\fIindex\fR
is not a valid file index in
\fIarchive\fR,
or the argument combination is invalid.
.TP 19n
[\fRZIP_ER_MEMORY\fR]
Required memory could not be allocated.
.TP 19n
[\fRZIP_ER_RDONLY\fR]
Read-only zip file, no changes allowed.
.SH "SEE ALSO"
libzip(3),
zip_encryption_method_supported(3),
zip_fopen_encrypted(3),
zip_fopen_index_encrypted(3),
zip_set_default_password(3),
zip_stat(3)
.SH "HISTORY"
\fBzip_file_set_encryption\fR()
was added in libzip 1.2.0.
.SH "AUTHORS"
Dieter Baron <\fIdillo@nih.at\fR>
and
Thomas Klausner <\fItk@giga.or.at\fR>