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Content #! /usr/bin/env python3 """RFC 3548: Base16, Base32, Base64 Data Encodings""" # Modified 04-Oct-1995 by Jack Jansen to use binascii module # Modified 30-Dec-2003 by Barry Warsaw to add full RFC 3548 support # Modified 22-May-2007 by Guido van Rossum to use bytes everywhere import re import struct import binascii __all__ = ['b64decode'] bytes_types = (bytes, bytearray) # Types acceptable as binary data def _bytes_from_decode_data(s): if isinstance(s, str): try: return s.encode('ascii') # except UnicodeEncodeError: except: raise ValueError('string argument should contain only ASCII characters') elif isinstance(s, bytes_types): return s else: raise TypeError("argument should be bytes or ASCII string, not %s" % s.__class__.__name__) def b64decode(s, altchars=None, validate=False): """Decode a Base64 encoded byte string. s is the byte string to decode. Optional altchars must be a string of length 2 which specifies the alternative alphabet used instead of the '+' and '/' characters. The decoded string is returned. A binascii.Error is raised if s is incorrectly padded. If validate is False (the default), non-base64-alphabet characters are discarded prior to the padding check. If validate is True, non-base64-alphabet characters in the input result in a binascii.Error. """ s = _bytes_from_decode_data(s) if altchars is not None: altchars = _bytes_from_decode_data(altchars) assert len(altchars) == 2, repr(altchars) s = s.translate(bytes.maketrans(altchars, b'+/')) if validate and not re.match(b'^[A-Za-z0-9+/]*={0,2}$', s): raise binascii.Error('Non-base64 digit found') return binascii.a2b_base64(s)