diff --git a/libarchive/__init__.py b/libarchive/__init__.py
index c4861f1..9df1921 100644
--- a/libarchive/__init__.py
+++ b/libarchive/__init__.py
@@ -426,11 +426,13 @@ class Entry(object):
 class Archive(object):
     '''A low-level archive reader which provides forward-only iteration. Consider
     this a light-weight pythonic libarchive wrapper.'''
-    def __init__(self, f, mode='r', format=None, filter=None, entry_class=Entry, encoding=ENCODING, blocksize=BLOCK_SIZE):
+    def __init__(self, f, mode='r', format=None, filter=None, entry_class=Entry, 
+        encoding=ENCODING, blocksize=BLOCK_SIZE, password=None):
         assert mode in ('r', 'w', 'wb', 'a'), 'Mode should be "r", "w", "wb", or "a".'
         self._stream = None
         self.encoding = encoding
         self.blocksize = blocksize
+        self.password = password
         if isinstance(f, str):
             self.filename = f
             f = open(f, mode)
@@ -499,8 +501,12 @@ class Archive(object):
         self.format_func(self._a)
         self.filter_func(self._a)
         if self.mode == 'r':
+            if self.password:
+                self.add_passphrase(self.password)
             call_and_check(_libarchive.archive_read_open_fd, self._a, self._a, self.f.fileno(), self.blocksize)
         else:
+            if self.password:
+                self.set_passphrase(self.password)
             call_and_check(_libarchive.archive_write_open_fd, self._a, self._a, self.f.fileno())
 
     def denit(self):
@@ -562,7 +568,7 @@ class Archive(object):
         '''Write current archive entry contents to file. f can be a file-like object or
         a path.'''
         if isinstance(f, str):
-            basedir = os.path.basename(f)
+            basedir = os.path.dirname(f)
             if not os.path.exists(basedir):
                 os.makedirs(basedir)
             f = open(f, 'w')
@@ -626,6 +632,10 @@ class Archive(object):
     def add_passphrase(self, password):
         '''Adds a password to the archive.'''
         _libarchive.archive_read_add_passphrase(self._a, password)
+    
+    def set_passphrase(self, password):
+        '''Sets a password for the archive.'''
+        _libarchive.archive_write_set_passphrase(self._a, password)
 
 
 class SeekableArchive(Archive):
diff --git a/libarchive/_libarchive.i b/libarchive/_libarchive.i
index 56d29fa..6a09bd2 100644
--- a/libarchive/_libarchive.i
+++ b/libarchive/_libarchive.i
@@ -535,8 +535,9 @@ PyObject *archive_read_data_into_str(struct archive *archive, int len) {
 }
 
 PyObject *archive_write_data_from_str(struct archive *archive, PyObject *str) {
-    int len = PyString_Size(str);
-    if (!archive_write_data(archive, PyString_AS_STRING(str), len)) {
+    Py_ssize_t len = PyBytes_Size(str);
+ 
+    if (!archive_write_data(archive, PyBytes_AS_STRING(str), len)) {
         PyErr_SetString(PyExc_RuntimeError, "could not write requested data.");
         return NULL;
     }
diff --git a/libarchive/_libarchive_wrap.c b/libarchive/_libarchive_wrap.c
index 315ecd2..1adbd15 100644
--- a/libarchive/_libarchive_wrap.c
+++ b/libarchive/_libarchive_wrap.c
@@ -3207,8 +3207,9 @@ PyObject *archive_read_data_into_str(struct archive *archive, int len) {
 }
 
 PyObject *archive_write_data_from_str(struct archive *archive, PyObject *str) {
-    int len = PyString_Size(str);
-    if (!archive_write_data(archive, PyString_AS_STRING(str), len)) {
+    Py_ssize_t len = PyBytes_Size(str);
+ 
+    if (!archive_write_data(archive, PyBytes_AS_STRING(str), len)) {
         PyErr_SetString(PyExc_RuntimeError, "could not write requested data.");
         return NULL;
     }
diff --git a/libarchive/zip.py b/libarchive/zip.py
index 053d712..2995aea 100644
--- a/libarchive/zip.py
+++ b/libarchive/zip.py
@@ -62,8 +62,8 @@ class ZipEntry(Entry):
 
 
 class ZipFile(SeekableArchive):
-    def __init__(self, f, mode='r', compression=ZIP_DEFLATED, allowZip64=False):
-        super(ZipFile, self).__init__(f, mode=mode, format='zip', entry_class=ZipEntry, encoding='CP437')
+    def __init__(self, f, mode='r', compression=ZIP_DEFLATED, allowZip64=False, password=None):
+        super(ZipFile, self).__init__(f, mode=mode, format='zip', entry_class=ZipEntry, encoding='CP437', password=password)
         if mode == 'w' and compression == ZIP_STORED:
             # Disable compression for writing.
             _libarchive.archive_write_set_format_option(self.archive._a, "zip", "compression", "store")
@@ -72,38 +72,39 @@ class ZipFile(SeekableArchive):
     getinfo     = SeekableArchive.getentry
 
     def namelist(self):
-        return list(self.iterpaths)
+        return list(self.iterpaths())
 
     def infolist(self):
         return list(self)
 
     def open(self, name, mode, pwd=None):
-        if pwd:
-            raise NotImplemented('Encryption not supported.')
         if mode == 'r':
+            if pwd:
+                self.add_passphrase(pwd)
             return self.readstream(name)
         else:
             return self.writestream(name)
 
     def extract(self, name, path=None, pwd=None):
         if pwd:
-            raise NotImplemented('Encryption not supported.')
+            self.add_passphrase(pwd)
         if not path:
             path = os.getcwd()
         return self.readpath(name, os.path.join(path, name))
 
     def extractall(self, path, names=None, pwd=None):
         if pwd:
-            raise NotImplemented('Encryption not supported.')
+            self.add_passphrase(pwd)
         if not names:
             names = self.namelist()
         if names:
+            print(f"Extracting {names} files.")
             for name in names:
                 self.extract(name, path)
 
     def read(self, name, pwd=None):
         if pwd:
-            raise NotImplemented('Encryption not supported.')
+            self.add_passphrase(pwd)
         return self.read(name)
 
     def writestr(self, member, data, compress_type=None):
@@ -112,7 +113,7 @@ class ZipFile(SeekableArchive):
         return self.write(member, data)
 
     def setpassword(self, pwd):
-        raise NotImplemented('Encryption not supported.')
+        return self.set_passphrase(pwd)
 
     def testzip(self):
         raise NotImplemented()