zip_file_set_encryption — set encryption method for file in zip

       Dieter Baron <dillo@nih.at> and Thomas Klausner <wiz@gatalith.at>

Debian                                            April 2, 2020                       ZIP_FILE_SET_ENCRYPTION(3)

       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).

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.

zip_file_set_encryption() was added in libzip 1.2.0.

       libzip (-lzip)

       zip_file_set_encryption — set encryption method for file in zip

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

libzip(3),  zip_encryption_method_supported(3),   zip_fopen_encrypted(3),   zip_fopen_index_encrypted(3),
       zip_set_default_password(3), zip_stat(3)

#include<zip.h>intzip_file_set_encryption(zip_t*archive, zip_uint64_tindex, zip_uint16_tmethod, constchar*password);