Python binascii 模块，a2b_base64() 实例源码

def b64decode(s, altchars=None, validate=False):
    """Decode the Base64 encoded bytes-like object or ASCII string s.

    Optional altchars must be a bytes-like object or ASCII string of length 2
    which specifies the alternative alphabet used instead of the '+' and '/'
    characters.

    The result is returned as a bytes object.  A binascii.Error is raised if
    s is incorrectly padded.

    If validate is False (the default), characters that are neither in the
    normal base-64 alphabet nor the alternative alphabet are discarded prior
    to the padding check.  If validate is True, these non-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)

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

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 decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.Header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

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 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 b64decode(s, altchars=None, validate=False):
    """Decode the Base64 encoded bytes-like object or ASCII string s.

    Optional altchars must be a bytes-like object or ASCII string of length 2
    which specifies the alternative alphabet used instead of the '+' and '/'
    characters.

    The result is returned as a bytes object.  A binascii.Error is raised if
    s is incorrectly padded.

    If validate is False (the default), characters that are neither in the
    normal base-64 alphabet nor the alternative alphabet are discarded prior
    to the padding check.  If validate is True, these non-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)

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

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 = s.translate(string.maketrans(altchars[:2], '+/'))
    try:
        return binascii.a2b_base64(s)
    except binascii.Error, msg:
        # Transform this exception for consistency
        raise TypeError(msg)

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

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 = s.translate(string.maketrans(altchars[:2], '+/'))
    try:
        return binascii.a2b_base64(s)
    except binascii.Error, msg:
        # Transform this exception for consistency
        raise TypeError(msg)

def decode(string):
    """Decode a raw base64 string, returning a bytes object.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not string:
        return bytes()
    elif isinstance(string, str):
        return a2b_base64(string.encode('raw-unicode-escape'))
    else:
        return a2b_base64(string)


# For convenience and backwards compatibility w/ standard base64 module

def verify_rsa_sha1(request, rsa_public_key):
    """Verify a RSASSA-PKCS #1 v1.5 base64 encoded signature.

    Per `section 3.4.3`_ of the spec.

    Note this method requires the jwt and cryptography libraries.

    .. _`section 3.4.3`: http://tools.ietf.org/html/rfc5849#section-3.4.3

    To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri
    attribute MUST be an absolute URI whose netloc part identifies the
    origin server or gateway on which the resource resides. Any Host
    item of the request argument's headers dict attribute will be
    ignored.

    .. _`RFC2616 section 5.2`: http://tools.ietf.org/html/rfc2616#section-5.2
    """
    norm_params = normalize_parameters(request.params)
    uri = normalize_base_string_uri(request.uri)
    message = construct_base_string(request.http_method, uri, norm_params).encode('utf-8')
    sig = binascii.a2b_base64(request.signature.encode('utf-8'))

    alg = _jwt_rs1_signing_algorithm()
    key = _prepare_key_plus(alg, rsa_public_key)
    return alg.verify(message, key, sig)

def Heuristics(self, data, noDecode=False):
        if data.lower().startswith('http:'):
            return data
        if data[::-1].lower().startswith('http:'):
            return data[::-1]
        if noDecode:
            return data
        try:
            decoded = binascii.a2b_hex(data)
            return self.Heuristics(decoded, True)
        except:
            if not re.compile(r'^[0-9a-zA-Z/=]+$').match(data):
                return data
            try:
                decoded = binascii.a2b_base64(data)
                return self.Heuristics(decoded, True)
            except:
                return data

    # bruteforce XOR; short strings (< 10) are keys

def handle_addl_headers(self, headers):
        for key, value in headers:
            if key == 'x-goog-hash':
                for hash_pair in value.split(','):
                    alg, b64_digest = hash_pair.strip().split('=', 1)
                    self.cloud_hashes[alg] = binascii.a2b_base64(b64_digest)
            elif key == 'x-goog-component-count':
                self.component_count = int(value)
            elif key == 'x-goog-generation':
                self.generation = value
            # Use x-goog-stored-content-encoding and
            # x-goog-stored-content-length to indicate original content length
            # and encoding, which are transcoding-invariant (so are preferable
            # over using content-encoding and size headers).
            elif key == 'x-goog-stored-content-encoding':
                self.content_encoding = value
            elif key == 'x-goog-stored-content-length':
                self.size = int(value)

def verify_rsa_sha1(request, rsa_public_key):
    """Verify a RSASSA-PKCS #1 v1.5 base64 encoded signature.

    Per `section 3.4.3`_ of the spec.

    Note this method requires the jwt and cryptography libraries.

    .. _`section 3.4.3`: http://tools.ietf.org/html/rfc5849#section-3.4.3

    To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri
    attribute MUST be an absolute URI whose netloc part identifies the
    origin server or gateway on which the resource resides. Any Host
    item of the request argument's headers dict attribute will be
    ignored.

    .. _`RFC2616 section 5.2`: http://tools.ietf.org/html/rfc2616#section-5.2
    """
    norm_params = normalize_parameters(request.params)
    uri = normalize_base_string_uri(request.uri)
    message = construct_base_string(request.http_method, uri, norm_params).encode('utf-8')
    sig = binascii.a2b_base64(request.signature.encode('utf-8'))

    alg = _jwt_rs1_signing_algorithm()
    key = _prepare_key_plus(alg, rsa_public_key)
    return alg.verify(message, key, sig)

def verify_rsa_sha1(request, rsa_public_key):
    """Verify a RSASSA-PKCS #1 v1.5 base64 encoded signature.

    Per `section 3.4.3`_ of the spec.

    Note this method requires the jwt and cryptography libraries.

    .. _`section 3.4.3`: http://tools.ietf.org/html/rfc5849#section-3.4.3

    To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri
    attribute MUST be an absolute URI whose netloc part identifies the
    origin server or gateway on which the resource resides. Any Host
    item of the request argument's headers dict attribute will be
    ignored.

    .. _`RFC2616 section 5.2`: http://tools.ietf.org/html/rfc2616#section-5.2
    """
    norm_params = normalize_parameters(request.params)
    uri = normalize_base_string_uri(request.uri)
    message = construct_base_string(request.http_method, uri, norm_params).encode('utf-8')
    sig = binascii.a2b_base64(request.signature.encode('utf-8'))

    alg = _jwt_rs1_signing_algorithm()
    key = _prepare_key_plus(alg, rsa_public_key)
    return alg.verify(message, key, sig)

def decode(string):
    """Decode a raw base64 string, returning a bytes object.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not string:
        return bytes()
    elif isinstance(string, str):
        return a2b_base64(string.encode('raw-unicode-escape'))
    else:
        return a2b_base64(string)


# For convenience and backwards compatibility w/ standard base64 module

def b64decode(s, altchars=None, validate=False):
    """Decode the Base64 encoded bytes-like object or ASCII string s.

    Optional altchars must be a bytes-like object or ASCII string of length 2
    which specifies the alternative alphabet used instead of the '+' and '/'
    characters.

    The result is returned as a bytes object.  A binascii.Error is raised if
    s is incorrectly padded.

    If validate is False (the default), characters that are neither in the
    normal base-64 alphabet nor the alternative alphabet are discarded prior
    to the padding check.  If validate is True, these non-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)

def get_trex_daemon_log (self):
        """
        Get Trex daemon log.

        :return: 
            String representation of TRex daemon log

        :raises:
            + :exc:`trex_exceptions.TRexRequestDenied`, in case file could not be read.
            + ProtocolError, in case of error in JSON-RPC protocol.

        """
        try:
            res = binascii.a2b_base64(self.server.get_trex_daemon_log())
            if type(res) is bytes:
                return res.decode()
            return res
        except AppError as err:
            self._handle_AppError_exception(err.args[0])
        except ProtocolError:
            raise
        finally:
            self.prompt_verbose_data()

def get_trex_log (self):
        """
        Get TRex CLI output log

        :return: 
            String representation of TRex log

        :raises:
            + :exc:`trex_exceptions.TRexRequestDenied`, in case file could not be fetched at server side.
            + ProtocolError, in case of error in JSON-RPC protocol.

        """
        try:
            res = binascii.a2b_base64(self.server.get_trex_log())
            if type(res) is bytes:
                return res.decode()
            return res
        except AppError as err:
            self._handle_AppError_exception(err.args[0])
        except ProtocolError:
            raise
        finally:
            self.prompt_verbose_data()

def get_file(self, filepath):
        """
        Gets content of file as bytes string from /tmp/trex_files or TRex server directory.

        :parameters:
            filepath : str
                a path to a file at server.
                it can be either relative to TRex server or absolute path starting with /tmp/trex_files

        :return: 
            Content of the file

        :raises:
            + :exc:`trex_exceptions.TRexRequestDenied`, in case TRex is reserved for another user than the one trying to cancel the reservation.
            + ProtocolError, in case of error in JSON-RPC protocol.
        """

        try:
            return binascii.a2b_base64(self.server.get_file(filepath))
        except AppError as err:
            self._handle_AppError_exception(err.args[0])
        except ProtocolError:
            raise
        finally:
            self.prompt_verbose_data()

def b64decode(s, altchars=None, validate=False):
    """Decode the Base64 encoded bytes-like object or ASCII string s.

    Optional altchars must be a bytes-like object or ASCII string of length 2
    which specifies the alternative alphabet used instead of the '+' and '/'
    characters.

    The result is returned as a bytes object.  A binascii.Error is raised if
    s is incorrectly padded.

    If validate is False (the default), characters that are neither in the
    normal base-64 alphabet nor the alternative alphabet are discarded prior
    to the padding check.  If validate is True, these non-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)

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8859-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8859-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

def decode(string):
    """Decode a raw base64 string, returning a bytes object.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not string:
        return bytes()
    elif isinstance(string, str):
        return a2b_base64(string.encode('raw-unicode-escape'))
    else:
        return a2b_base64(string)


# For convenience and backwards compatibility w/ standard base64 module

def uploadTimeSeries(request, seriesName):
    # TODO: check provider pass

    # TODO: check duplicated values

    data = json.loads(request.POST.get('toUpload'))
    seriesObj = Series.objects.get(name=seriesName)

    warnings.filterwarnings('ignore', '.*Invalid utf8 character string.*',)

    toInput = list()
    for i0, d0 in enumerate(data):
        toInput.append(Value(series=seriesObj, date=d0['date'][:-1], record=binascii.a2b_base64(d0['value'])))
        if i0 % 1000==0 and i0!=0:
            Value.objects.bulk_create(toInput)
            toInput = list()
    Value.objects.bulk_create(toInput)

    context = {'message': 'done!'}
    return HttpResponse(
                        json.dumps(context),
                        content_type="application/json"
                        )

def b64decode(s, altchars=None, validate=False):
    """Decode the Base64 encoded bytes-like object or ASCII string s.

    Optional altchars must be a bytes-like object or ASCII string of length 2
    which specifies the alternative alphabet used instead of the '+' and '/'
    characters.

    The result is returned as a bytes object.  A binascii.Error is raised if
    s is incorrectly padded.

    If validate is False (the default), characters that are neither in the
    normal base-64 alphabet nor the alternative alphabet are discarded prior
    to the padding check.  If validate is True, these non-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)

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

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 verify_rsa_sha1(request, rsa_public_key):
    """Verify a RSASSA-PKCS #1 v1.5 base64 encoded signature.

    Per `section 3.4.3`_ of the spec.

    Note this method requires the jwt and cryptography libraries.

    .. _`section 3.4.3`: http://tools.ietf.org/html/rfc5849#section-3.4.3

    To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri
    attribute MUST be an absolute URI whose netloc part identifies the
    origin server or gateway on which the resource resides. Any Host
    item of the request argument's headers dict attribute will be
    ignored.

    .. _`RFC2616 section 5.2`: http://tools.ietf.org/html/rfc2616#section-5.2
    """
    norm_params = normalize_parameters(request.params)
    uri = normalize_base_string_uri(request.uri)
    message = construct_base_string(request.http_method, uri, norm_params).encode('utf-8')
    sig = binascii.a2b_base64(request.signature.encode('utf-8'))

    alg = _jwt_rs1_signing_algorithm()
    key = _prepare_key_plus(alg, rsa_public_key)
    return alg.verify(message, key, sig)

def verify_rsa_sha1(request, rsa_public_key):
    """Verify a RSASSA-PKCS #1 v1.5 base64 encoded signature.

    Per `section 3.4.3`_ of the spec.

    Note this method requires the jwt and cryptography libraries.

    .. _`section 3.4.3`: http://tools.ietf.org/html/rfc5849#section-3.4.3

    To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri
    attribute MUST be an absolute URI whose netloc part identifies the
    origin server or gateway on which the resource resides. Any Host
    item of the request argument's headers dict attribute will be
    ignored.

    .. _`RFC2616 section 5.2`: http://tools.ietf.org/html/rfc2616#section-5.2
    """
    norm_params = normalize_parameters(request.params)
    uri = normalize_base_string_uri(request.uri)
    message = construct_base_string(request.http_method, uri, norm_params).encode('utf-8')
    sig = binascii.a2b_base64(request.signature.encode('utf-8'))

    alg = _jwt_rs1_signing_algorithm()
    key = _prepare_key_plus(alg, rsa_public_key)
    return alg.verify(message, key, sig)

def decode(string):
    """Decode a raw base64 string, returning a bytes object.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not string:
        return bytes()
    elif isinstance(string, str):
        return a2b_base64(string.encode('raw-unicode-escape'))
    else:
        return a2b_base64(string)


# For convenience and backwards compatibility w/ standard base64 module

def setup_data(filter_method, filter_vars):
        code = marshal.loads(binascii.a2b_base64(filter_method))
        func = types.FunctionType(code, globals(), "some_func_name")
        filter_vars, transactions, users, stock_payments, stock_payment_transactions, inventory_transactions, inventory = func(
            filter_vars=filter_vars,
            transactions=Transaction.objects.all(),
            users=User.objects.all(),
            stock_payments=StockPayment.objects.all(),
            stock_payment_transactions=StockPaymentTransaction.objects.all(),
            inventory_transactions=InventoryTransaction.objects.all(),
            inventory=Inventory.objects.all()
        )
        LOOKUP_OBJECTS['Transaction'] = transactions
        LOOKUP_OBJECTS['User'] = users
        LOOKUP_OBJECTS['StockPayment'] = stock_payments
        LOOKUP_OBJECTS['StockPaymentTransaction'] = stock_payment_transactions
        LOOKUP_OBJECTS['Inventory'] = inventory
        LOOKUP_OBJECTS['InventoryTransaction'] = inventory_transactions

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)

def verify_rsa_sha1(request, rsa_public_key):
    """Verify a RSASSA-PKCS #1 v1.5 base64 encoded signature.

    Per `section 3.4.3`_ of the spec.

    Note this method requires the jwt and cryptography libraries.

    .. _`section 3.4.3`: http://tools.ietf.org/html/rfc5849#section-3.4.3

    To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri
    attribute MUST be an absolute URI whose netloc part identifies the
    origin server or gateway on which the resource resides. Any Host
    item of the request argument's headers dict attribute will be
    ignored.

    .. _`RFC2616 section 5.2`: http://tools.ietf.org/html/rfc2616#section-5.2
    """
    norm_params = normalize_parameters(request.params)
    uri = normalize_base_string_uri(request.uri)
    message = construct_base_string(request.http_method, uri, norm_params).encode('utf-8')
    sig = binascii.a2b_base64(request.signature.encode('utf-8'))

    alg = _jwt_rs1_signing_algorithm()
    key = _prepare_key_plus(alg, rsa_public_key)
    return alg.verify(message, key, sig)

def handle_addl_headers(self, headers):
        for key, value in headers:
            if key == 'x-goog-hash':
                for hash_pair in value.split(','):
                    alg, b64_digest = hash_pair.strip().split('=', 1)
                    self.cloud_hashes[alg] = binascii.a2b_base64(b64_digest)
            elif key == 'x-goog-component-count':
                self.component_count = int(value)
            elif key == 'x-goog-generation':
                self.generation = value
            # Use x-goog-stored-content-encoding and
            # x-goog-stored-content-length to indicate original content length
            # and encoding, which are transcoding-invariant (so are preferable
            # over using content-encoding and size headers).
            elif key == 'x-goog-stored-content-encoding':
                self.content_encoding = value
            elif key == 'x-goog-stored-content-length':
                self.size = int(value)

def decode(string):
    """Decode a raw base64 string, returning a bytes object.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not string:
        return bytes()
    elif isinstance(string, str):
        return a2b_base64(string.encode('raw-unicode-escape'))
    else:
        return a2b_base64(string)


# For convenience and backwards compatibility w/ standard base64 module

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

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 = s.translate(string.maketrans(altchars[:2], '+/'))
    try:
        return binascii.a2b_base64(s)
    except binascii.Error, msg:
        # Transform this exception for consistency
        raise TypeError(msg)

def decode(string):
    """Decode a raw base64 string, returning a bytes object.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not string:
        return bytes()
    elif isinstance(string, str):
        return a2b_base64(string.encode('raw-unicode-escape'))
    else:
        return a2b_base64(string)


# For convenience and backwards compatibility w/ standard base64 module

def decode(string):
    """Decode a raw base64 string, returning a bytes object.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not string:
        return bytes()
    elif isinstance(string, str):
        return a2b_base64(string.encode('raw-unicode-escape'))
    else:
        return a2b_base64(string)


# For convenience and backwards compatibility w/ standard base64 module

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)

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

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 decode(string):
    """Decode a raw base64 string, returning a bytes object.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not string:
        return bytes()
    elif isinstance(string, str):
        return a2b_base64(string.encode('raw-unicode-escape'))
    else:
        return a2b_base64(string)


# For convenience and backwards compatibility w/ standard base64 module

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)

def decode(s, convert_eols=None):
    """Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    """
    if not s:
        return s

    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec


# For convenience and backwards compatibility w/ standard base64 module

def b64decode(s, altchars=None, validate=False):
    """Decode the Base64 encoded bytes-like object or ASCII string s.

    Optional altchars must be a bytes-like object or ASCII string of length 2
    which specifies the alternative alphabet used instead of the '+' and '/'
    characters.

    The result is returned as a bytes object.  A binascii.Error is raised if
    s is incorrectly padded.

    If validate is False (the default), characters that are neither in the
    normal base-64 alphabet nor the alternative alphabet are discarded prior
    to the padding check.  If validate is True, these non-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)