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.
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_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>