def c_uint8_ptr(data):
if isinstance(data, _buffer_type):
# This only works for cffi >= 1.7
return ffi.cast(uint8_t_type, ffi.from_buffer(data))
elif byte_string(data) or isinstance(data, _Array):
return data
else:
raise TypeError("Object type %s cannot be passed to C code" % type(data))
def c_uint8_ptr(data):
if byte_string(data) or isinstance(data, _Array):
return data
elif isinstance(data, _buffer_type):
obj = _py_object(data)
buf = _Py_buffer()
_PyObject_GetBuffer(obj, byref(buf), _PyBUF_SIMPLE)
buffer_type = c_ubyte * buf.len
return buffer_type.from_address(buf.buf)
else:
raise TypeError("Object type %s cannot be passed to C code" %
type(data))
def encode(self):
"""Return this DER SEQUENCE, fully encoded as a
binary string.
Raises:
ValueError: if some elements in the sequence are neither integers
nor byte strings.
"""
self.payload = b''
for item in self._seq:
if byte_string(item):
self.payload += item
elif _is_number(item):
self.payload += DerInteger(item).encode()
else:
self.payload += item.encode()
return DerObject.encode(self)
def decode(self, der_encoded, strict=False):
"""Decode a complete DER element, and re-initializes this
object with it.
Args:
der_encoded (byte string): A complete DER element.
Raises:
ValueError: in case of parsing errors.
"""
if not byte_string(der_encoded):
raise ValueError("Input is not a byte string")
s = BytesIO_EOF(der_encoded)
self._decodeFromStream(s, strict)
# There shouldn't be other bytes left
if s.remaining_data() > 0:
raise ValueError("Unexpected extra data after the DER structure")
return self