def _encrypt(self):
"""
Rebuild the master key from header settings and key-hash list. Encrypt
the stream start bytes and the out-buffer formatted as hashed block
stream with padding added as needed.
"""
# rebuild master key from (possibly) updated header
self._make_master_key()
# make hashed block stream
block_buffer = HashedBlockIO()
block_buffer.write(self.out_buffer.read())
# data is buffered in hashed block io, start a new one
self.out_buffer = io.BytesIO()
# write start bytes (for successful decrypt check)
self.out_buffer.write(self.header.StreamStartBytes)
# append blocked data to out-buffer
block_buffer.write_block_stream(self.out_buffer)
block_buffer.close()
self.out_buffer.seek(0)
# encrypt the whole thing with header settings and master key
data = pad(self.out_buffer.read())
self.out_buffer = aes_cbc_encrypt(data, self.master_key,
self.header.EncryptionIV)
def _encrypt(self):
"""
Rebuild the master key from header settings and key-hash list. Encrypt
the stream start bytes and the out-buffer formatted as hashed block
stream with padding added as needed.
"""
# rebuild master key from (possibly) updated header
self._make_master_key()
# make hashed block stream
block_buffer = HashedBlockIO()
block_buffer.write(self.out_buffer.read())
# data is buffered in hashed block io, start a new one
self.out_buffer = io.BytesIO()
# write start bytes (for successful decrypt check)
self.out_buffer.write(self.header.StreamStartBytes)
# append blocked data to out-buffer
block_buffer.write_block_stream(self.out_buffer)
block_buffer.close()
self.out_buffer.seek(0)
# encrypt the whole thing with header settings and master key
data = pad(self.out_buffer.read())
self.out_buffer = aes_cbc_encrypt(data, self.master_key,
self.header.EncryptionIV)
