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.

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)

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>