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Edit file: /usr/lib/python3.9/site-packages/passlib/utils/binary.py
""" passlib.utils.binary - binary data encoding/decoding/manipulation """ #============================================================================= # imports #============================================================================= # core from __future__ import absolute_import, division, print_function from base64 import ( b64encode, b64decode, b32decode as _b32decode, b32encode as _b32encode, ) from binascii import b2a_base64, a2b_base64, Error as _BinAsciiError import logging log = logging.getLogger(__name__) # site # pkg from passlib import exc from passlib.utils.compat import ( PY3, bascii_to_str, irange, imap, iter_byte_chars, join_byte_values, join_byte_elems, nextgetter, suppress_cause, u, unicode, unicode_or_bytes_types, ) from passlib.utils.decor import memoized_property # from passlib.utils import BASE64_CHARS, HASH64_CHARS # local __all__ = [ # constants "BASE64_CHARS", "PADDED_BASE64_CHARS", "AB64_CHARS", "HASH64_CHARS", "BCRYPT_CHARS", "HEX_CHARS", "LOWER_HEX_CHARS", "UPPER_HEX_CHARS", "ALL_BYTE_VALUES", # misc "compile_byte_translation", # base64 'ab64_encode', 'ab64_decode', 'b64s_encode', 'b64s_decode', # base32 "b32encode", "b32decode", # custom encodings 'Base64Engine', 'LazyBase64Engine', 'h64', 'h64big', 'bcrypt64', ] #============================================================================= # constant strings #============================================================================= #------------------------------------------------------------- # common salt_chars & checksum_chars values #------------------------------------------------------------- #: standard base64 charmap BASE64_CHARS = u("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/") #: alt base64 charmap -- "." instead of "+" AB64_CHARS = u("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789./") #: charmap used by HASH64 encoding. HASH64_CHARS = u("./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz") #: charmap used by BCrypt BCRYPT_CHARS = u("./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") #: std base64 chars + padding char PADDED_BASE64_CHARS = BASE64_CHARS + u("=") #: all hex chars HEX_CHARS = u("0123456789abcdefABCDEF") #: upper case hex chars UPPER_HEX_CHARS = u("0123456789ABCDEF") #: lower case hex chars LOWER_HEX_CHARS = u("0123456789abcdef") #------------------------------------------------------------- # byte strings #------------------------------------------------------------- #: special byte string containing all possible byte values #: NOTE: for efficiency, this is treated as singleton by some of the code ALL_BYTE_VALUES = join_byte_values(irange(256)) #: some string constants we reuse B_EMPTY = b'' B_NULL = b'\x00' B_EQUAL = b'=' #============================================================================= # byte translation #============================================================================= #: base list used to compile byte translations _TRANSLATE_SOURCE = list(iter_byte_chars(ALL_BYTE_VALUES)) def compile_byte_translation(mapping, source=None): """ return a 256-byte string for translating bytes using specified mapping. bytes not specified by mapping will be left alone. :param mapping: dict mapping input byte (str or int) -> output byte (str or int). :param source: optional existing byte translation string to use as base. (must be 255-length byte string). defaults to identity mapping. :returns: 255-length byte string for passing to bytes().translate. """ if source is None: target = _TRANSLATE_SOURCE[:] else: assert isinstance(source, bytes) and len(source) == 255 target = list(iter_byte_chars(source)) for k, v in mapping.items(): if isinstance(k, unicode_or_bytes_types): k = ord(k) assert isinstance(k, int) and 0 <= k < 256 if isinstance(v, unicode): v = v.encode("ascii") assert isinstance(v, bytes) and len(v) == 1 target[k] = v return B_EMPTY.join(target) #============================================================================= # unpadding / stripped base64 encoding #============================================================================= def b64s_encode(data): """ encode using shortened base64 format which omits padding & whitespace. uses default ``+/`` altchars. """ return b2a_base64(data).rstrip(_BASE64_STRIP) def b64s_decode(data): """ decode from shortened base64 format which omits padding & whitespace. uses default ``+/`` altchars. """ if isinstance(data, unicode): # needs bytes for replace() call, but want to accept ascii-unicode ala a2b_base64() try: data = data.encode("ascii") except UnicodeEncodeError: raise suppress_cause(ValueError("string argument should contain only ASCII characters")) off = len(data) & 3 if off == 0: pass elif off == 2: data += _BASE64_PAD2 elif off == 3: data += _BASE64_PAD1 else: # off == 1 raise ValueError("invalid base64 input") try: return a2b_base64(data) except _BinAsciiError as err: raise suppress_cause(TypeError(err)) #============================================================================= # adapted-base64 encoding #============================================================================= _BASE64_STRIP = b"=\n" _BASE64_PAD1 = b"=" _BASE64_PAD2 = b"==" # XXX: Passlib 1.8/1.9 -- deprecate everything that's using ab64_encode(), # have it start outputing b64s_encode() instead? can use a64_decode() to retain backwards compat. def ab64_encode(data): """ encode using shortened base64 format which omits padding & whitespace. uses custom ``./`` altchars. it is primarily used by Passlib's custom pbkdf2 hashes. """ return b64s_encode(data).replace(b"+", b".") def ab64_decode(data): """ decode from shortened base64 format which omits padding & whitespace. uses custom ``./`` altchars, but supports decoding normal ``+/`` altchars as well. it is primarily used by Passlib's custom pbkdf2 hashes. """ if isinstance(data, unicode): # needs bytes for replace() call, but want to accept ascii-unicode ala a2b_base64() try: data = data.encode("ascii") except UnicodeEncodeError: raise suppress_cause(ValueError("string argument should contain only ASCII characters")) return b64s_decode(data.replace(b".", b"+")) #============================================================================= # base32 codec #============================================================================= def b32encode(source): """ wrapper around :func:`base64.b32encode` which strips padding, and returns a native string. """ # NOTE: using upper case by default here, since 'I & L' are less # visually ambiguous than 'i & l' return bascii_to_str(_b32encode(source).rstrip(B_EQUAL)) #: byte translation map to replace common mistyped base32 chars. #: XXX: could correct '1' -> 'I', but could be a mistyped lower-case 'l', so leaving it alone. _b32_translate = compile_byte_translation({"8": "B", "0": "O"}) #: helper to add padding _b32_decode_pad = B_EQUAL * 8 def b32decode(source): """ wrapper around :func:`base64.b32decode` which handles common mistyped chars. padding optional, ignored if present. """ # encode & correct for typos if isinstance(source, unicode): source = source.encode("ascii") source = source.translate(_b32_translate) # pad things so final string is multiple of 8 remainder = len(source) & 0x7 if remainder: source += _b32_decode_pad[:-remainder] # XXX: py27 stdlib's version of this has some inefficiencies, # could look into using optimized version. return _b32decode(source, True) #============================================================================= # base64-variant encoding #============================================================================= class Base64Engine(object): """Provides routines for encoding/decoding base64 data using arbitrary character mappings, selectable endianness, etc. :arg charmap: A string of 64 unique characters, which will be used to encode successive 6-bit chunks of data. A character's position within the string should correspond to its 6-bit value. :param big: Whether the encoding should be big-endian (default False). .. note:: This class does not currently handle base64's padding characters in any way what so ever. Raw Bytes <-> Encoded Bytes =========================== The following methods convert between raw bytes, and strings encoded using the engine's specific base64 variant: .. automethod:: encode_bytes .. automethod:: decode_bytes .. automethod:: encode_transposed_bytes .. automethod:: decode_transposed_bytes .. .. automethod:: check_repair_unused .. automethod:: repair_unused Integers <-> Encoded Bytes ========================== The following methods allow encoding and decoding unsigned integers to and from the engine's specific base64 variant. Endianess is determined by the engine's ``big`` constructor keyword. .. automethod:: encode_int6 .. automethod:: decode_int6 .. automethod:: encode_int12 .. automethod:: decode_int12 .. automethod:: encode_int24 .. automethod:: decode_int24 .. automethod:: encode_int64 .. automethod:: decode_int64 Informational Attributes ======================== .. attribute:: charmap unicode string containing list of characters used in encoding; position in string matches 6bit value of character. .. attribute:: bytemap bytes version of :attr:`charmap` .. attribute:: big boolean flag indicating this using big-endian encoding. """ #=================================================================== # instance attrs #=================================================================== # public config bytemap = None # charmap as bytes big = None # little or big endian # filled in by init based on charmap. # (byte elem: single byte under py2, 8bit int under py3) _encode64 = None # maps 6bit value -> byte elem _decode64 = None # maps byte elem -> 6bit value # helpers filled in by init based on endianness _encode_bytes = None # throws IndexError if bad value (shouldn't happen) _decode_bytes = None # throws KeyError if bad char. #=================================================================== # init #=================================================================== def __init__(self, charmap, big=False): # validate charmap, generate encode64/decode64 helper functions. if isinstance(charmap, unicode): charmap = charmap.encode("latin-1") elif not isinstance(charmap, bytes): raise exc.ExpectedStringError(charmap, "charmap") if len(charmap) != 64: raise ValueError("charmap must be 64 characters in length") if len(set(charmap)) != 64: raise ValueError("charmap must not contain duplicate characters") self.bytemap = charmap self._encode64 = charmap.__getitem__ lookup = dict((value, idx) for idx, value in enumerate(charmap)) self._decode64 = lookup.__getitem__ # validate big, set appropriate helper functions. self.big = big if big: self._encode_bytes = self._encode_bytes_big self._decode_bytes = self._decode_bytes_big else: self._encode_bytes = self._encode_bytes_little self._decode_bytes = self._decode_bytes_little # TODO: support padding character ##if padding is not None: ## if isinstance(padding, unicode): ## padding = padding.encode("latin-1") ## elif not isinstance(padding, bytes): ## raise TypeError("padding char must be unicode or bytes") ## if len(padding) != 1: ## raise ValueError("padding must be single character") ##self.padding = padding @property def charmap(self): """charmap as unicode""" return self.bytemap.decode("latin-1") #=================================================================== # encoding byte strings #=================================================================== def encode_bytes(self, source): """encode bytes to base64 string. :arg source: byte string to encode. :returns: byte string containing encoded data. """ if not isinstance(source, bytes): raise TypeError("source must be bytes, not %s" % (type(source),)) chunks, tail = divmod(len(source), 3) if PY3: next_value = nextgetter(iter(source)) else: next_value = nextgetter(ord(elem) for elem in source) gen = self._encode_bytes(next_value, chunks, tail) out = join_byte_elems(imap(self._encode64, gen)) ##if tail: ## padding = self.padding ## if padding: ## out += padding * (3-tail) return out def _encode_bytes_little(self, next_value, chunks, tail): """helper used by encode_bytes() to handle little-endian encoding""" # # output bit layout: # # first byte: v1 543210 # # second byte: v1 ....76 # +v2 3210.. # # third byte: v2 ..7654 # +v3 10.... # # fourth byte: v3 765432 # idx = 0 while idx < chunks: v1 = next_value() v2 = next_value() v3 = next_value() yield v1 & 0x3f yield ((v2 & 0x0f)<<2)|(v1>>6) yield ((v3 & 0x03)<<4)|(v2>>4) yield v3>>2 idx += 1 if tail: v1 = next_value() if tail == 1: # note: 4 msb of last byte are padding yield v1 & 0x3f yield v1>>6 else: assert tail == 2 # note: 2 msb of last byte are padding v2 = next_value() yield v1 & 0x3f yield ((v2 & 0x0f)<<2)|(v1>>6) yield v2>>4 def _encode_bytes_big(self, next_value, chunks, tail): """helper used by encode_bytes() to handle big-endian encoding""" # # output bit layout: # # first byte: v1 765432 # # second byte: v1 10.... # +v2 ..7654 # # third byte: v2 3210.. # +v3 ....76 # # fourth byte: v3 543210 # idx = 0 while idx < chunks: v1 = next_value() v2 = next_value() v3 = next_value() yield v1>>2 yield ((v1&0x03)<<4)|(v2>>4) yield ((v2&0x0f)<<2)|(v3>>6) yield v3 & 0x3f idx += 1 if tail: v1 = next_value() if tail == 1: # note: 4 lsb of last byte are padding yield v1>>2 yield (v1&0x03)<<4 else: assert tail == 2 # note: 2 lsb of last byte are padding v2 = next_value() yield v1>>2 yield ((v1&0x03)<<4)|(v2>>4) yield ((v2&0x0f)<<2) #=================================================================== # decoding byte strings #=================================================================== def decode_bytes(self, source): """decode bytes from base64 string. :arg source: byte string to decode. :returns: byte string containing decoded data. """ if not isinstance(source, bytes): raise TypeError("source must be bytes, not %s" % (type(source),)) ##padding = self.padding ##if padding: ## # TODO: add padding size check? ## source = source.rstrip(padding) chunks, tail = divmod(len(source), 4) if tail == 1: # only 6 bits left, can't encode a whole byte! raise ValueError("input string length cannot be == 1 mod 4") next_value = nextgetter(imap(self._decode64, source)) try: return join_byte_values(self._decode_bytes(next_value, chunks, tail)) except KeyError as err: raise ValueError("invalid character: %r" % (err.args[0],)) def _decode_bytes_little(self, next_value, chunks, tail): """helper used by decode_bytes() to handle little-endian encoding""" # # input bit layout: # # first byte: v1 ..543210 # +v2 10...... # # second byte: v2 ....5432 # +v3 3210.... # # third byte: v3 ......54 # +v4 543210.. # idx = 0 while idx < chunks: v1 = next_value() v2 = next_value() v3 = next_value() v4 = next_value() yield v1 | ((v2 & 0x3) << 6) yield (v2>>2) | ((v3 & 0xF) << 4) yield (v3>>4) | (v4<<2) idx += 1 if tail: # tail is 2 or 3 v1 = next_value() v2 = next_value() yield v1 | ((v2 & 0x3) << 6) # NOTE: if tail == 2, 4 msb of v2 are ignored (should be 0) if tail == 3: # NOTE: 2 msb of v3 are ignored (should be 0) v3 = next_value() yield (v2>>2) | ((v3 & 0xF) << 4) def _decode_bytes_big(self, next_value, chunks, tail): """helper used by decode_bytes() to handle big-endian encoding""" # # input bit layout: # # first byte: v1 543210.. # +v2 ......54 # # second byte: v2 3210.... # +v3 ....5432 # # third byte: v3 10...... # +v4 ..543210 # idx = 0 while idx < chunks: v1 = next_value() v2 = next_value() v3 = next_value() v4 = next_value() yield (v1<<2) | (v2>>4) yield ((v2&0xF)<<4) | (v3>>2) yield ((v3&0x3)<<6) | v4 idx += 1 if tail: # tail is 2 or 3 v1 = next_value() v2 = next_value() yield (v1<<2) | (v2>>4) # NOTE: if tail == 2, 4 lsb of v2 are ignored (should be 0) if tail == 3: # NOTE: 2 lsb of v3 are ignored (should be 0) v3 = next_value() yield ((v2&0xF)<<4) | (v3>>2) #=================================================================== # encode/decode helpers #=================================================================== # padmap2/3 - dict mapping last char of string -> # equivalent char with no padding bits set. def __make_padset(self, bits): """helper to generate set of valid last chars & bytes""" pset = set(c for i,c in enumerate(self.bytemap) if not i & bits) pset.update(c for i,c in enumerate(self.charmap) if not i & bits) return frozenset(pset) @memoized_property def _padinfo2(self): """mask to clear padding bits, and valid last bytes (for strings 2 % 4)""" # 4 bits of last char unused (lsb for big, msb for little) bits = 15 if self.big else (15<<2) return ~bits, self.__make_padset(bits) @memoized_property def _padinfo3(self): """mask to clear padding bits, and valid last bytes (for strings 3 % 4)""" # 2 bits of last char unused (lsb for big, msb for little) bits = 3 if self.big else (3<<4) return ~bits, self.__make_padset(bits) def check_repair_unused(self, source): """helper to detect & clear invalid unused bits in last character. :arg source: encoded data (as ascii bytes or unicode). :returns: `(True, result)` if the string was repaired, `(False, source)` if the string was ok as-is. """ # figure out how many padding bits there are in last char. tail = len(source) & 3 if tail == 2: mask, padset = self._padinfo2 elif tail == 3: mask, padset = self._padinfo3 elif not tail: return False, source else: raise ValueError("source length must != 1 mod 4") # check if last char is ok (padset contains bytes & unicode versions) last = source[-1] if last in padset: return False, source # we have dirty bits - repair the string by decoding last char, # clearing the padding bits via <mask>, and encoding new char. if isinstance(source, unicode): cm = self.charmap last = cm[cm.index(last) & mask] assert last in padset, "failed to generate valid padding char" else: # NOTE: this assumes ascii-compat encoding, and that # all chars used by encoding are 7-bit ascii. last = self._encode64(self._decode64(last) & mask) assert last in padset, "failed to generate valid padding char" if PY3: last = bytes([last]) return True, source[:-1] + last def repair_unused(self, source): return self.check_repair_unused(source)[1] ##def transcode(self, source, other): ## return ''.join( ## other.charmap[self.charmap.index(char)] ## for char in source ## ) ##def random_encoded_bytes(self, size, random=None, unicode=False): ## "return random encoded string of given size" ## data = getrandstr(random or rng, ## self.charmap if unicode else self.bytemap, size) ## return self.repair_unused(data) #=================================================================== # transposed encoding/decoding #=================================================================== def encode_transposed_bytes(self, source, offsets): """encode byte string, first transposing source using offset list""" if not isinstance(source, bytes): raise TypeError("source must be bytes, not %s" % (type(source),)) tmp = join_byte_elems(source[off] for off in offsets) return self.encode_bytes(tmp) def decode_transposed_bytes(self, source, offsets): """decode byte string, then reverse transposition described by offset list""" # NOTE: if transposition does not use all bytes of source, # the original can't be recovered... and join_byte_elems() will throw # an error because 1+ values in <buf> will be None. tmp = self.decode_bytes(source) buf = [None] * len(offsets) for off, char in zip(offsets, tmp): buf[off] = char return join_byte_elems(buf) #=================================================================== # integer decoding helpers - mainly used by des_crypt family #=================================================================== def _decode_int(self, source, bits): """decode base64 string -> integer :arg source: base64 string to decode. :arg bits: number of bits in resulting integer. :raises ValueError: * if the string contains invalid base64 characters. * if the string is not long enough - it must be at least ``int(ceil(bits/6))`` in length. :returns: a integer in the range ``0 <= n < 2**bits`` """ if not isinstance(source, bytes): raise TypeError("source must be bytes, not %s" % (type(source),)) big = self.big pad = -bits % 6 chars = (bits+pad)/6 if len(source) != chars: raise ValueError("source must be %d chars" % (chars,)) decode = self._decode64 out = 0 try: for c in source if big else reversed(source): out = (out<<6) + decode(c) except KeyError: raise ValueError("invalid character in string: %r" % (c,)) if pad: # strip padding bits if big: out >>= pad else: out &= (1<<bits)-1 return out #--------------------------------------------------------------- # optimized versions for common integer sizes #--------------------------------------------------------------- def decode_int6(self, source): """decode single character -> 6 bit integer""" if not isinstance(source, bytes): raise TypeError("source must be bytes, not %s" % (type(source),)) if len(source) != 1: raise ValueError("source must be exactly 1 byte") if PY3: # convert to 8bit int before doing lookup source = source[0] try: return self._decode64(source) except KeyError: raise ValueError("invalid character") def decode_int12(self, source): """decodes 2 char string -> 12-bit integer""" if not isinstance(source, bytes): raise TypeError("source must be bytes, not %s" % (type(source),)) if len(source) != 2: raise ValueError("source must be exactly 2 bytes") decode = self._decode64 try: if self.big: return decode(source[1]) + (decode(source[0])<<6) else: return decode(source[0]) + (decode(source[1])<<6) except KeyError: raise ValueError("invalid character") def decode_int24(self, source): """decodes 4 char string -> 24-bit integer""" if not isinstance(source, bytes): raise TypeError("source must be bytes, not %s" % (type(source),)) if len(source) != 4: raise ValueError("source must be exactly 4 bytes") decode = self._decode64 try: if self.big: return decode(source[3]) + (decode(source[2])<<6)+ \ (decode(source[1])<<12) + (decode(source[0])<<18) else: return decode(source[0]) + (decode(source[1])<<6)+ \ (decode(source[2])<<12) + (decode(source[3])<<18) except KeyError: raise ValueError("invalid character") def decode_int30(self, source): """decode 5 char string -> 30 bit integer""" return self._decode_int(source, 30) def decode_int64(self, source): """decode 11 char base64 string -> 64-bit integer this format is used primarily by des-crypt & variants to encode the DES output value used as a checksum. """ return self._decode_int(source, 64) #=================================================================== # integer encoding helpers - mainly used by des_crypt family #=================================================================== def _encode_int(self, value, bits): """encode integer into base64 format :arg value: non-negative integer to encode :arg bits: number of bits to encode :returns: a string of length ``int(ceil(bits/6.0))``. """ assert value >= 0, "caller did not sanitize input" pad = -bits % 6 bits += pad if self.big: itr = irange(bits-6, -6, -6) # shift to add lsb padding. value <<= pad else: itr = irange(0, bits, 6) # padding is msb, so no change needed. return join_byte_elems(imap(self._encode64, ((value>>off) & 0x3f for off in itr))) #--------------------------------------------------------------- # optimized versions for common integer sizes #--------------------------------------------------------------- def encode_int6(self, value): """encodes 6-bit integer -> single hash64 character""" if value < 0 or value > 63: raise ValueError("value out of range") if PY3: return self.bytemap[value:value+1] else: return self._encode64(value) def encode_int12(self, value): """encodes 12-bit integer -> 2 char string""" if value < 0 or value > 0xFFF: raise ValueError("value out of range") raw = [value & 0x3f, (value>>6) & 0x3f] if self.big: raw = reversed(raw) return join_byte_elems(imap(self._encode64, raw)) def encode_int24(self, value): """encodes 24-bit integer -> 4 char string""" if value < 0 or value > 0xFFFFFF: raise ValueError("value out of range") raw = [value & 0x3f, (value>>6) & 0x3f, (value>>12) & 0x3f, (value>>18) & 0x3f] if self.big: raw = reversed(raw) return join_byte_elems(imap(self._encode64, raw)) def encode_int30(self, value): """decode 5 char string -> 30 bit integer""" if value < 0 or value > 0x3fffffff: raise ValueError("value out of range") return self._encode_int(value, 30) def encode_int64(self, value): """encode 64-bit integer -> 11 char hash64 string this format is used primarily by des-crypt & variants to encode the DES output value used as a checksum. """ if value < 0 or value > 0xffffffffffffffff: raise ValueError("value out of range") return self._encode_int(value, 64) #=================================================================== # eof #=================================================================== class LazyBase64Engine(Base64Engine): """Base64Engine which delays initialization until it's accessed""" _lazy_opts = None def __init__(self, *args, **kwds): self._lazy_opts = (args, kwds) def _lazy_init(self): args, kwds = self._lazy_opts super(LazyBase64Engine, self).__init__(*args, **kwds) del self._lazy_opts self.__class__ = Base64Engine def __getattribute__(self, attr): if not attr.startswith("_"): self._lazy_init() return object.__getattribute__(self, attr) #------------------------------------------------------------- # common variants #------------------------------------------------------------- h64 = LazyBase64Engine(HASH64_CHARS) h64big = LazyBase64Engine(HASH64_CHARS, big=True) bcrypt64 = LazyBase64Engine(BCRYPT_CHARS, big=True) #============================================================================= # eof #=============================================================================
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