NAME

zip_file_set_encryption —

set encryption method for file in zip

LIBRARY

libzip (-lzip)

SYNOPSIS

#include <zip.h>

int
zip_file_set_encryption(zip_t *archive, zip_uint64_t index, zip_uint16_t method, const char *password);

DESCRIPTION

The zip_file_set_encryption() function sets the encryption method for the file at position index in the zip archive to method using the password password. The method is the same as returned by zip_stat(3). For the method argument, currently only the following values are supported:

ZIP_EM_NONE: No encryption.
ZIP_EM_AES_128: Winzip AES-128 encryption.
ZIP_EM_AES_192: Winzip AES-192 encryption.
ZIP_EM_AES_256: Winzip AES-256 encryption.
ZIP_EM_TRAD_PKWARE: Traditional PKWare encryption. Do not use this method, it is not secure. It is only provided for backwards compatibility.

If password is NULL, the default password provided by zip_set_default_password(3) is used.

The current encryption method for a file in a zip archive can be determined using zip_stat(3).

RETURN VALUES

Upon successful completion 0 is returned. Otherwise, -1 is returned and the error information in archive is set to indicate the error.

ERRORS

zip_file_set_encryption() fails if:

[ZIP_ER_ENCRNOTSUPP]: Unsupported compression method requested.
[ZIP_ER_INVAL]: index is not a valid file index in archive, or the argument combination is invalid.
[ZIP_ER_MEMORY]: Required memory could not be allocated.
[ZIP_ER_RDONLY]: Read-only zip file, no changes allowed.

HISTORY

zip_file_set_encryption() was added in libzip 1.2.0.

AUTHORS

Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>