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-rwxr-xr-xlib/python2.7/base64.py360
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diff --git a/lib/python2.7/base64.py b/lib/python2.7/base64.py
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-#! /usr/bin/env python
-
-"""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
-
-import re
-import struct
-import binascii
-
-
-__all__ = [
- # Legacy interface exports traditional RFC 1521 Base64 encodings
- 'encode', 'decode', 'encodestring', 'decodestring',
- # Generalized interface for other encodings
- 'b64encode', 'b64decode', 'b32encode', 'b32decode',
- 'b16encode', 'b16decode',
- # Standard Base64 encoding
- 'standard_b64encode', 'standard_b64decode',
- # Some common Base64 alternatives. As referenced by RFC 3458, see thread
- # starting at:
- #
- # http://zgp.org/pipermail/p2p-hackers/2001-September/000316.html
- 'urlsafe_b64encode', 'urlsafe_b64decode',
- ]
-
-_translation = [chr(_x) for _x in range(256)]
-EMPTYSTRING = ''
-
-
-def _translate(s, altchars):
- translation = _translation[:]
- for k, v in altchars.items():
- translation[ord(k)] = v
- return s.translate(''.join(translation))
-
-
-
-# Base64 encoding/decoding uses binascii
-
-def b64encode(s, altchars=None):
- """Encode a string using Base64.
-
- s is the string to encode. Optional altchars must be a string of at least
- length 2 (additional characters are ignored) which specifies an
- alternative alphabet for the '+' and '/' characters. This allows an
- application to e.g. generate url or filesystem safe Base64 strings.
-
- The encoded string is returned.
- """
- # Strip off the trailing newline
- encoded = binascii.b2a_base64(s)[:-1]
- if altchars is not None:
- return _translate(encoded, {'+': altchars[0], '/': altchars[1]})
- return encoded
-
-
-def b64decode(s, altchars=None):
- """Decode a Base64 encoded string.
-
- s is the string to decode. Optional altchars must be a string of at least
- length 2 (additional characters are ignored) which specifies the
- alternative alphabet used instead of the '+' and '/' characters.
-
- The decoded string is returned. A TypeError is raised if s were
- incorrectly padded or if there are non-alphabet characters present in the
- string.
- """
- if altchars is not None:
- s = _translate(s, {altchars[0]: '+', altchars[1]: '/'})
- try:
- return binascii.a2b_base64(s)
- except binascii.Error, msg:
- # Transform this exception for consistency
- raise TypeError(msg)
-
-
-def standard_b64encode(s):
- """Encode a string using the standard Base64 alphabet.
-
- s is the string to encode. The encoded string is returned.
- """
- return b64encode(s)
-
-def standard_b64decode(s):
- """Decode a string encoded with the standard Base64 alphabet.
-
- s is the string to decode. The decoded string is returned. A TypeError
- is raised if the string is incorrectly padded or if there are non-alphabet
- characters present in the string.
- """
- return b64decode(s)
-
-def urlsafe_b64encode(s):
- """Encode a string using a url-safe Base64 alphabet.
-
- s is the string to encode. The encoded string is returned. The alphabet
- uses '-' instead of '+' and '_' instead of '/'.
- """
- return b64encode(s, '-_')
-
-def urlsafe_b64decode(s):
- """Decode a string encoded with the standard Base64 alphabet.
-
- s is the string to decode. The decoded string is returned. A TypeError
- is raised if the string is incorrectly padded or if there are non-alphabet
- characters present in the string.
-
- The alphabet uses '-' instead of '+' and '_' instead of '/'.
- """
- return b64decode(s, '-_')
-
-
-
-# Base32 encoding/decoding must be done in Python
-_b32alphabet = {
- 0: 'A', 9: 'J', 18: 'S', 27: '3',
- 1: 'B', 10: 'K', 19: 'T', 28: '4',
- 2: 'C', 11: 'L', 20: 'U', 29: '5',
- 3: 'D', 12: 'M', 21: 'V', 30: '6',
- 4: 'E', 13: 'N', 22: 'W', 31: '7',
- 5: 'F', 14: 'O', 23: 'X',
- 6: 'G', 15: 'P', 24: 'Y',
- 7: 'H', 16: 'Q', 25: 'Z',
- 8: 'I', 17: 'R', 26: '2',
- }
-
-_b32tab = _b32alphabet.items()
-_b32tab.sort()
-_b32tab = [v for k, v in _b32tab]
-_b32rev = dict([(v, long(k)) for k, v in _b32alphabet.items()])
-
-
-def b32encode(s):
- """Encode a string using Base32.
-
- s is the string to encode. The encoded string is returned.
- """
- parts = []
- quanta, leftover = divmod(len(s), 5)
- # Pad the last quantum with zero bits if necessary
- if leftover:
- s += ('\0' * (5 - leftover))
- quanta += 1
- for i in range(quanta):
- # c1 and c2 are 16 bits wide, c3 is 8 bits wide. The intent of this
- # code is to process the 40 bits in units of 5 bits. So we take the 1
- # leftover bit of c1 and tack it onto c2. Then we take the 2 leftover
- # bits of c2 and tack them onto c3. The shifts and masks are intended
- # to give us values of exactly 5 bits in width.
- c1, c2, c3 = struct.unpack('!HHB', s[i*5:(i+1)*5])
- c2 += (c1 & 1) << 16 # 17 bits wide
- c3 += (c2 & 3) << 8 # 10 bits wide
- parts.extend([_b32tab[c1 >> 11], # bits 1 - 5
- _b32tab[(c1 >> 6) & 0x1f], # bits 6 - 10
- _b32tab[(c1 >> 1) & 0x1f], # bits 11 - 15
- _b32tab[c2 >> 12], # bits 16 - 20 (1 - 5)
- _b32tab[(c2 >> 7) & 0x1f], # bits 21 - 25 (6 - 10)
- _b32tab[(c2 >> 2) & 0x1f], # bits 26 - 30 (11 - 15)
- _b32tab[c3 >> 5], # bits 31 - 35 (1 - 5)
- _b32tab[c3 & 0x1f], # bits 36 - 40 (1 - 5)
- ])
- encoded = EMPTYSTRING.join(parts)
- # Adjust for any leftover partial quanta
- if leftover == 1:
- return encoded[:-6] + '======'
- elif leftover == 2:
- return encoded[:-4] + '===='
- elif leftover == 3:
- return encoded[:-3] + '==='
- elif leftover == 4:
- return encoded[:-1] + '='
- return encoded
-
-
-def b32decode(s, casefold=False, map01=None):
- """Decode a Base32 encoded string.
-
- s is the string to decode. Optional casefold is a flag specifying whether
- a lowercase alphabet is acceptable as input. For security purposes, the
- default is False.
-
- RFC 3548 allows for optional mapping of the digit 0 (zero) to the letter O
- (oh), and for optional mapping of the digit 1 (one) to either the letter I
- (eye) or letter L (el). The optional argument map01 when not None,
- specifies which letter the digit 1 should be mapped to (when map01 is not
- None, the digit 0 is always mapped to the letter O). For security
- purposes the default is None, so that 0 and 1 are not allowed in the
- input.
-
- The decoded string is returned. A TypeError is raised if s were
- incorrectly padded or if there are non-alphabet characters present in the
- string.
- """
- quanta, leftover = divmod(len(s), 8)
- if leftover:
- raise TypeError('Incorrect padding')
- # Handle section 2.4 zero and one mapping. The flag map01 will be either
- # False, or the character to map the digit 1 (one) to. It should be
- # either L (el) or I (eye).
- if map01:
- s = _translate(s, {'0': 'O', '1': map01})
- if casefold:
- s = s.upper()
- # Strip off pad characters from the right. We need to count the pad
- # characters because this will tell us how many null bytes to remove from
- # the end of the decoded string.
- padchars = 0
- mo = re.search('(?P<pad>[=]*)$', s)
- if mo:
- padchars = len(mo.group('pad'))
- if padchars > 0:
- s = s[:-padchars]
- # Now decode the full quanta
- parts = []
- acc = 0
- shift = 35
- for c in s:
- val = _b32rev.get(c)
- if val is None:
- raise TypeError('Non-base32 digit found')
- acc += _b32rev[c] << shift
- shift -= 5
- if shift < 0:
- parts.append(binascii.unhexlify('%010x' % acc))
- acc = 0
- shift = 35
- # Process the last, partial quanta
- last = binascii.unhexlify('%010x' % acc)
- if padchars == 0:
- last = '' # No characters
- elif padchars == 1:
- last = last[:-1]
- elif padchars == 3:
- last = last[:-2]
- elif padchars == 4:
- last = last[:-3]
- elif padchars == 6:
- last = last[:-4]
- else:
- raise TypeError('Incorrect padding')
- parts.append(last)
- return EMPTYSTRING.join(parts)
-
-
-
-# RFC 3548, Base 16 Alphabet specifies uppercase, but hexlify() returns
-# lowercase. The RFC also recommends against accepting input case
-# insensitively.
-def b16encode(s):
- """Encode a string using Base16.
-
- s is the string to encode. The encoded string is returned.
- """
- return binascii.hexlify(s).upper()
-
-
-def b16decode(s, casefold=False):
- """Decode a Base16 encoded string.
-
- s is the string to decode. Optional casefold is a flag specifying whether
- a lowercase alphabet is acceptable as input. For security purposes, the
- default is False.
-
- The decoded string is returned. A TypeError is raised if s were
- incorrectly padded or if there are non-alphabet characters present in the
- string.
- """
- if casefold:
- s = s.upper()
- if re.search('[^0-9A-F]', s):
- raise TypeError('Non-base16 digit found')
- return binascii.unhexlify(s)
-
-
-
-# Legacy interface. This code could be cleaned up since I don't believe
-# binascii has any line length limitations. It just doesn't seem worth it
-# though.
-
-MAXLINESIZE = 76 # Excluding the CRLF
-MAXBINSIZE = (MAXLINESIZE//4)*3
-
-def encode(input, output):
- """Encode a file."""
- while True:
- s = input.read(MAXBINSIZE)
- if not s:
- break
- while len(s) < MAXBINSIZE:
- ns = input.read(MAXBINSIZE-len(s))
- if not ns:
- break
- s += ns
- line = binascii.b2a_base64(s)
- output.write(line)
-
-
-def decode(input, output):
- """Decode a file."""
- while True:
- line = input.readline()
- if not line:
- break
- s = binascii.a2b_base64(line)
- output.write(s)
-
-
-def encodestring(s):
- """Encode a string into multiple lines of base-64 data."""
- pieces = []
- for i in range(0, len(s), MAXBINSIZE):
- chunk = s[i : i + MAXBINSIZE]
- pieces.append(binascii.b2a_base64(chunk))
- return "".join(pieces)
-
-
-def decodestring(s):
- """Decode a string."""
- return binascii.a2b_base64(s)
-
-
-
-# Useable as a script...
-def test():
- """Small test program"""
- import sys, getopt
- try:
- opts, args = getopt.getopt(sys.argv[1:], 'deut')
- except getopt.error, msg:
- sys.stdout = sys.stderr
- print msg
- print """usage: %s [-d|-e|-u|-t] [file|-]
- -d, -u: decode
- -e: encode (default)
- -t: encode and decode string 'Aladdin:open sesame'"""%sys.argv[0]
- sys.exit(2)
- func = encode
- for o, a in opts:
- if o == '-e': func = encode
- if o == '-d': func = decode
- if o == '-u': func = decode
- if o == '-t': test1(); return
- if args and args[0] != '-':
- with open(args[0], 'rb') as f:
- func(f, sys.stdout)
- else:
- func(sys.stdin, sys.stdout)
-
-
-def test1():
- s0 = "Aladdin:open sesame"
- s1 = encodestring(s0)
- s2 = decodestring(s1)
- print s0, repr(s1), s2
-
-
-if __name__ == '__main__':
- test()