FM / python3.7

/opt/alt/python37/lib64/python3.7

Name	Size	Mode	Actions
asyncio/	-	0755	rm
collections/	-	0755	rm
concurrent/	-	0755	rm
config-3.7m/	-	0755	rm
ctypes/	-	0755	rm
curses/	-	0755	rm
dbm/	-	0755	rm
distutils/	-	0755	rm
email/	-	0755	rm
encodings/	-	0755	rm
ensurepip/	-	0755	rm
html/	-	0755	rm
http/	-	0755	rm
idlelib/	-	0755	rm
importlib/	-	0755	rm
json/	-	0755	rm
lib-dynload/	-	0755	rm
lib2to3/	-	0755	rm
logging/	-	0755	rm
multiprocessing/	-	0755	rm
pydoc_data/	-	0755	rm
site-packages/	-	0755	rm
sqlite3/	-	0755	rm
test/	-	0755	rm
unittest/	-	0755	rm
urllib/	-	0755	rm
venv/	-	0755	rm
wsgiref/	-	0755	rm
xml/	-	0755	rm
xmlrpc/	-	0755	rm
__pycache__/	-	0755	rm
abc.py	5580	0644	edit dl rm
aifc.py	32814	0644	edit dl rm
antigravity.py	477	0644	edit dl rm
argparse.py	95372	0644	edit dl rm
ast.py	12842	0644	edit dl rm
asynchat.py	11328	0644	edit dl rm
asyncore.py	20118	0644	edit dl rm
base64.py	20393	0755	edit dl rm
bdb.py	31730	0644	edit dl rm
binhex.py	13954	0644	edit dl rm
bisect.py	2557	0644	edit dl rm
bz2.py	12410	0644	edit dl rm
calendar.py	24826	0644	edit dl rm
cgi.py	35050	0755	edit dl rm
cgitb.py	12018	0644	edit dl rm
chunk.py	5435	0644	edit dl rm
cmd.py	14860	0644	edit dl rm
code.py	10622	0644	edit dl rm
codecs.py	36615	0644	edit dl rm
codeop.py	6275	0644	edit dl rm
colorsys.py	4064	0644	edit dl rm
compileall.py	13788	0644	edit dl rm
configparser.py	54283	0644	edit dl rm
contextlib.py	24763	0644	edit dl rm
contextvars.py	129	0644	edit dl rm
copy.py	8856	0644	edit dl rm
copyreg.py	7017	0644	edit dl rm
cProfile.py	6253	0755	edit dl rm
crypt.py	3346	0644	edit dl rm
csv.py	16180	0644	edit dl rm
dataclasses.py	49520	0644	edit dl rm
datetime.py	86544	0644	edit dl rm
decimal.py	320	0644	edit dl rm
difflib.py	84393	0644	edit dl rm
dis.py	19888	0644	edit dl rm
doctest.py	104560	0644	edit dl rm
dummy_threading.py	2815	0644	edit dl rm
enum.py	35043	0644	edit dl rm
filecmp.py	9830	0644	edit dl rm
fileinput.py	14625	0644	edit dl rm
fnmatch.py	4056	0644	edit dl rm
formatter.py	15143	0644	edit dl rm
fractions.py	23752	0644	edit dl rm
ftplib.py	35618	0644	edit dl rm
functools.py	32932	0644	edit dl rm
genericpath.py	4912	0644	edit dl rm
getopt.py	7489	0644	edit dl rm
getpass.py	5994	0644	edit dl rm
gettext.py	21967	0644	edit dl rm
glob.py	5638	0644	edit dl rm
gzip.py	20637	0644	edit dl rm
hashlib.py	9534	0644	edit dl rm
heapq.py	23017	0644	edit dl rm
hmac.py	6517	0644	edit dl rm
imaplib.py	53292	0644	edit dl rm
imghdr.py	3795	0644	edit dl rm
imp.py	10536	0644	edit dl rm
inspect.py	117635	0644	edit dl rm
io.py	3517	0644	edit dl rm
ipaddress.py	73578	0644	edit dl rm
keyword.py	2256	0755	edit dl rm
linecache.py	5330	0644	edit dl rm
locale.py	78191	0644	edit dl rm
lzma.py	12983	0644	edit dl rm
macpath.py	6123	0644	edit dl rm
mailbox.py	78654	0644	edit dl rm
mailcap.py	9067	0644	edit dl rm
mimetypes.py	21496	0644	edit dl rm
modulefinder.py	23035	0644	edit dl rm
netrc.py	5566	0644	edit dl rm
nntplib.py	43087	0644	edit dl rm
ntpath.py	22340	0644	edit dl rm
nturl2path.py	2584	0644	edit dl rm
numbers.py	10244	0644	edit dl rm
opcode.py	5824	0644	edit dl rm
operator.py	10863	0644	edit dl rm
optparse.py	60371	0644	edit dl rm
os.py	37901	0644	edit dl rm
pathlib.py	50329	0644	edit dl rm
pdb.py	62505	0755	edit dl rm
pickle.py	57994	0644	edit dl rm
pickletools.py	91220	0644	edit dl rm
pipes.py	8916	0644	edit dl rm
pkgutil.py	21461	0644	edit dl rm
platform.py	46994	0755	edit dl rm
plistlib.py	30709	0644	edit dl rm
poplib.py	14964	0644	edit dl rm
posixpath.py	15771	0644	edit dl rm
pprint.py	20884	0644	edit dl rm
profile.py	22494	0755	edit dl rm
pstats.py	27315	0644	edit dl rm
pty.py	4763	0644	edit dl rm
pyclbr.py	15137	0644	edit dl rm
pydoc.py	105876	0644	edit dl rm
py_compile.py	8001	0644	edit dl rm
queue.py	11359	0644	edit dl rm
quopri.py	7265	0755	edit dl rm
random.py	27557	0644	edit dl rm
re.py	15306	0644	edit dl rm
reprlib.py	5267	0644	edit dl rm
rlcompleter.py	7097	0644	edit dl rm
runpy.py	11959	0644	edit dl rm
sched.py	6442	0644	edit dl rm
secrets.py	2038	0644	edit dl rm
selectors.py	18561	0644	edit dl rm
shelve.py	8527	0644	edit dl rm
shlex.py	13100	0644	edit dl rm
shutil.py	41950	0644	edit dl rm
signal.py	2123	0644	edit dl rm
site.py	21575	0644	edit dl rm
smtpd.py	34722	0755	edit dl rm
smtplib.py	44443	0755	edit dl rm
sndhdr.py	7086	0644	edit dl rm
socket.py	27469	0644	edit dl rm
socketserver.py	26923	0644	edit dl rm
sre_compile.py	26872	0644	edit dl rm
sre_constants.py	7177	0644	edit dl rm
sre_parse.py	39156	0644	edit dl rm
ssl.py	45495	0644	edit dl rm
stat.py	5391	0644	edit dl rm
statistics.py	20651	0644	edit dl rm
string.py	11564	0644	edit dl rm
stringprep.py	12917	0644	edit dl rm
struct.py	257	0644	edit dl rm
subprocess.py	72649	0644	edit dl rm
sunau.py	18375	0644	edit dl rm
symbol.py	2142	0755	edit dl rm
symtable.py	7279	0644	edit dl rm
sysconfig.py	24440	0644	edit dl rm
tabnanny.py	11419	0755	edit dl rm
tarfile.py	92675	0755	edit dl rm
telnetlib.py	23135	0644	edit dl rm
tempfile.py	26730	0644	edit dl rm
textwrap.py	19407	0644	edit dl rm
this.py	1003	0644	edit dl rm
threading.py	49284	0644	edit dl rm
timeit.py	13493	0755	edit dl rm
token.py	3763	0644	edit dl rm
tokenize.py	27031	0644	edit dl rm
trace.py	28903	0755	edit dl rm
traceback.py	23437	0644	edit dl rm
tracemalloc.py	17076	0644	edit dl rm
tty.py	879	0644	edit dl rm
types.py	9897	0644	edit dl rm
typing.py	56438	0644	edit dl rm
uu.py	7277	0644	edit dl rm
uuid.py	29518	0644	edit dl rm
warnings.py	20080	0644	edit dl rm
wave.py	18230	0644	edit dl rm
weakref.py	21508	0644	edit dl rm
webbrowser.py	23715	0755	edit dl rm
xdrlib.py	5913	0644	edit dl rm
zipapp.py	7535	0644	edit dl rm
zipfile.py	81094	0644	edit dl rm
_bootlocale.py	1801	0644	edit dl rm
_collections_abc.py	26424	0644	edit dl rm
_compat_pickle.py	8749	0644	edit dl rm
_compression.py	5340	0644	edit dl rm
_dummy_thread.py	6027	0644	edit dl rm
_markupbase.py	14598	0644	edit dl rm
_osx_support.py	19600	0644	edit dl rm
_pydecimal.py	228690	0644	edit dl rm
_pyio.py	91616	0644	edit dl rm
_py_abc.py	6186	0644	edit dl rm
_sitebuiltins.py	3115	0644	edit dl rm
_strptime.py	25504	0644	edit dl rm
_sysconfigdata_dm_linux_x86_64-linux-gnu.py	29786	0644	edit dl rm
_sysconfigdata_m_linux_x86_64-linux-gnu.py	28651	0644	edit dl rm
_threading_local.py	7214	0644	edit dl rm
_weakrefset.py	5679	0644	edit dl rm
__future__.py	5101	0644	edit dl rm
__phello__.foo.py	64	0644	edit dl rm

Edit: /opt/alt/python37/lib64/python3.7/ssl.py (45495B)

# Wrapper module for _ssl, providing some additional facilities
# implemented in Python.  Written by Bill Janssen.

"""This module provides some more Pythonic support for SSL.

Object types:

SSLSocket -- subtype of socket.socket which does SSL over the socket

Exceptions:

SSLError -- exception raised for I/O errors

Functions:

cert_time_to_seconds -- convert time string used for certificate
                          notBefore and notAfter functions to integer
                          seconds past the Epoch (the time values
                          returned from time.time())

fetch_server_certificate (HOST, PORT) -- fetch the certificate provided
                          by the server running on HOST at port PORT.  No
                          validation of the certificate is performed.

Integer constants:

SSL_ERROR_ZERO_RETURN
SSL_ERROR_WANT_READ
SSL_ERROR_WANT_WRITE
SSL_ERROR_WANT_X509_LOOKUP
SSL_ERROR_SYSCALL
SSL_ERROR_SSL
SSL_ERROR_WANT_CONNECT

SSL_ERROR_EOF
SSL_ERROR_INVALID_ERROR_CODE

The following group define certificate requirements that one side is
allowing/requiring from the other side:

CERT_NONE - no certificates from the other side are required (or will
            be looked at if provided)
CERT_OPTIONAL - certificates are not required, but if provided will be
                validated, and if validation fails, the connection will
                also fail
CERT_REQUIRED - certificates are required, and will be validated, and
                if validation fails, the connection will also fail

The following constants identify various SSL protocol variants:

PROTOCOL_SSLv2
PROTOCOL_SSLv3
PROTOCOL_SSLv23
PROTOCOL_TLS
PROTOCOL_TLS_CLIENT
PROTOCOL_TLS_SERVER
PROTOCOL_TLSv1
PROTOCOL_TLSv1_1
PROTOCOL_TLSv1_2

The following constants identify various SSL alert message descriptions as per
http://www.iana.org/assignments/tls-parameters/tls-parameters.xml#tls-parameters-6

ALERT_DESCRIPTION_CLOSE_NOTIFY
ALERT_DESCRIPTION_UNEXPECTED_MESSAGE
ALERT_DESCRIPTION_BAD_RECORD_MAC
ALERT_DESCRIPTION_RECORD_OVERFLOW
ALERT_DESCRIPTION_DECOMPRESSION_FAILURE
ALERT_DESCRIPTION_HANDSHAKE_FAILURE
ALERT_DESCRIPTION_BAD_CERTIFICATE
ALERT_DESCRIPTION_UNSUPPORTED_CERTIFICATE
ALERT_DESCRIPTION_CERTIFICATE_REVOKED
ALERT_DESCRIPTION_CERTIFICATE_EXPIRED
ALERT_DESCRIPTION_CERTIFICATE_UNKNOWN
ALERT_DESCRIPTION_ILLEGAL_PARAMETER
ALERT_DESCRIPTION_UNKNOWN_CA
ALERT_DESCRIPTION_ACCESS_DENIED
ALERT_DESCRIPTION_DECODE_ERROR
ALERT_DESCRIPTION_DECRYPT_ERROR
ALERT_DESCRIPTION_PROTOCOL_VERSION
ALERT_DESCRIPTION_INSUFFICIENT_SECURITY
ALERT_DESCRIPTION_INTERNAL_ERROR
ALERT_DESCRIPTION_USER_CANCELLED
ALERT_DESCRIPTION_NO_RENEGOTIATION
ALERT_DESCRIPTION_UNSUPPORTED_EXTENSION
ALERT_DESCRIPTION_CERTIFICATE_UNOBTAINABLE
ALERT_DESCRIPTION_UNRECOGNIZED_NAME
ALERT_DESCRIPTION_BAD_CERTIFICATE_STATUS_RESPONSE
ALERT_DESCRIPTION_BAD_CERTIFICATE_HASH_VALUE
ALERT_DESCRIPTION_UNKNOWN_PSK_IDENTITY
"""

import sys
import os
from collections import namedtuple
from enum import Enum as _Enum, IntEnum as _IntEnum, IntFlag as _IntFlag

import _ssl             # if we can't import it, let the error propagate

from _ssl import OPENSSL_VERSION_NUMBER, OPENSSL_VERSION_INFO, OPENSSL_VERSION
from _ssl import _SSLContext, MemoryBIO, SSLSession
from _ssl import (
    SSLError, SSLZeroReturnError, SSLWantReadError, SSLWantWriteError,
    SSLSyscallError, SSLEOFError, SSLCertVerificationError
    )
from _ssl import txt2obj as _txt2obj, nid2obj as _nid2obj
from _ssl import RAND_status, RAND_add, RAND_bytes, RAND_pseudo_bytes
try:
    from _ssl import RAND_egd
except ImportError:
    # LibreSSL does not provide RAND_egd
    pass

from _ssl import (
    HAS_SNI, HAS_ECDH, HAS_NPN, HAS_ALPN, HAS_SSLv2, HAS_SSLv3, HAS_TLSv1,
    HAS_TLSv1_1, HAS_TLSv1_2, HAS_TLSv1_3
)
from _ssl import _DEFAULT_CIPHERS, _OPENSSL_API_VERSION

_IntEnum._convert(
    '_SSLMethod', __name__,
    lambda name: name.startswith('PROTOCOL_') and name != 'PROTOCOL_SSLv23',
    source=_ssl)

_IntFlag._convert(
    'Options', __name__,
    lambda name: name.startswith('OP_'),
    source=_ssl)

_IntEnum._convert(
    'AlertDescription', __name__,
    lambda name: name.startswith('ALERT_DESCRIPTION_'),
    source=_ssl)

_IntEnum._convert(
    'SSLErrorNumber', __name__,
    lambda name: name.startswith('SSL_ERROR_'),
    source=_ssl)

_IntFlag._convert(
    'VerifyFlags', __name__,
    lambda name: name.startswith('VERIFY_'),
    source=_ssl)

_IntEnum._convert(
    'VerifyMode', __name__,
    lambda name: name.startswith('CERT_'),
    source=_ssl)

PROTOCOL_SSLv23 = _SSLMethod.PROTOCOL_SSLv23 = _SSLMethod.PROTOCOL_TLS
_PROTOCOL_NAMES = {value: name for name, value in _SSLMethod.__members__.items()}

_SSLv2_IF_EXISTS = getattr(_SSLMethod, 'PROTOCOL_SSLv2', None)

class TLSVersion(_IntEnum):
    MINIMUM_SUPPORTED = _ssl.PROTO_MINIMUM_SUPPORTED
    SSLv3 = _ssl.PROTO_SSLv3
    TLSv1 = _ssl.PROTO_TLSv1
    TLSv1_1 = _ssl.PROTO_TLSv1_1
    TLSv1_2 = _ssl.PROTO_TLSv1_2
    TLSv1_3 = _ssl.PROTO_TLSv1_3
    MAXIMUM_SUPPORTED = _ssl.PROTO_MAXIMUM_SUPPORTED

if sys.platform == "win32":
    from _ssl import enum_certificates, enum_crls

from socket import socket, AF_INET, SOCK_STREAM, create_connection
from socket import SOL_SOCKET, SO_TYPE
import socket as _socket
import base64        # for DER-to-PEM translation
import errno
import warnings

socket_error = OSError  # keep that public name in module namespace

CHANNEL_BINDING_TYPES = ['tls-unique']

HAS_NEVER_CHECK_COMMON_NAME = hasattr(_ssl, 'HOSTFLAG_NEVER_CHECK_SUBJECT')

_RESTRICTED_SERVER_CIPHERS = _DEFAULT_CIPHERS

CertificateError = SSLCertVerificationError

def _dnsname_match(dn, hostname):
    """Matching according to RFC 6125, section 6.4.3

- Hostnames are compared lower case.
    - For IDNA, both dn and hostname must be encoded as IDN A-label (ACE).
    - Partial wildcards like 'www*.example.org', multiple wildcards, sole
      wildcard or wildcards in labels other then the left-most label are not
      supported and a CertificateError is raised.
    - A wildcard must match at least one character.
    """
    if not dn:
        return False

wildcards = dn.count('*')
    # speed up common case w/o wildcards
    if not wildcards:
        return dn.lower() == hostname.lower()

if wildcards > 1:
        raise CertificateError(
            "too many wildcards in certificate DNS name: {!r}.".format(dn))

dn_leftmost, sep, dn_remainder = dn.partition('.')

if '*' in dn_remainder:
        # Only match wildcard in leftmost segment.
        raise CertificateError(
            "wildcard can only be present in the leftmost label: "
            "{!r}.".format(dn))

if not sep:
        # no right side
        raise CertificateError(
            "sole wildcard without additional labels are not support: "
            "{!r}.".format(dn))

if dn_leftmost != '*':
        # no partial wildcard matching
        raise CertificateError(
            "partial wildcards in leftmost label are not supported: "
            "{!r}.".format(dn))

hostname_leftmost, sep, hostname_remainder = hostname.partition('.')
    if not hostname_leftmost or not sep:
        # wildcard must match at least one char
        return False
    return dn_remainder.lower() == hostname_remainder.lower()

def _inet_paton(ipname):
    """Try to convert an IP address to packed binary form

Supports IPv4 addresses on all platforms and IPv6 on platforms with IPv6
    support.
    """
    # inet_aton() also accepts strings like '1', '127.1', some also trailing
    # data like '127.0.0.1 whatever'.
    try:
        addr = _socket.inet_aton(ipname)
    except OSError:
        # not an IPv4 address
        pass
    else:
        if _socket.inet_ntoa(addr) == ipname:
            # only accept injective ipnames
            return addr
        else:
            # refuse for short IPv4 notation and additional trailing data
            raise ValueError(
                "{!r} is not a quad-dotted IPv4 address.".format(ipname)
            )

try:
        return _socket.inet_pton(_socket.AF_INET6, ipname)
    except OSError:
        raise ValueError("{!r} is neither an IPv4 nor an IP6 "
                         "address.".format(ipname))
    except AttributeError:
        # AF_INET6 not available
        pass

raise ValueError("{!r} is not an IPv4 address.".format(ipname))

def _ipaddress_match(cert_ipaddress, host_ip):
    """Exact matching of IP addresses.

RFC 6125 explicitly doesn't define an algorithm for this
    (section 1.7.2 - "Out of Scope").
    """
    # OpenSSL may add a trailing newline to a subjectAltName's IP address,
    # commonly woth IPv6 addresses. Strip off trailing \n.
    ip = _inet_paton(cert_ipaddress.rstrip())
    return ip == host_ip

def match_hostname(cert, hostname):
    """Verify that *cert* (in decoded format as returned by
    SSLSocket.getpeercert()) matches the *hostname*.  RFC 2818 and RFC 6125
    rules are followed.

The function matches IP addresses rather than dNSNames if hostname is a
    valid ipaddress string. IPv4 addresses are supported on all platforms.
    IPv6 addresses are supported on platforms with IPv6 support (AF_INET6
    and inet_pton).

CertificateError is raised on failure. On success, the function
    returns nothing.
    """
    if not cert:
        raise ValueError("empty or no certificate, match_hostname needs a "
                         "SSL socket or SSL context with either "
                         "CERT_OPTIONAL or CERT_REQUIRED")
    try:
        host_ip = _inet_paton(hostname)
    except ValueError:
        # Not an IP address (common case)
        host_ip = None
    dnsnames = []
    san = cert.get('subjectAltName', ())
    for key, value in san:
        if key == 'DNS':
            if host_ip is None and _dnsname_match(value, hostname):
                return
            dnsnames.append(value)
        elif key == 'IP Address':
            if host_ip is not None and _ipaddress_match(value, host_ip):
                return
            dnsnames.append(value)
    if not dnsnames:
        # The subject is only checked when there is no dNSName entry
        # in subjectAltName
        for sub in cert.get('subject', ()):
            for key, value in sub:
                # XXX according to RFC 2818, the most specific Common Name
                # must be used.
                if key == 'commonName':
                    if _dnsname_match(value, hostname):
                        return
                    dnsnames.append(value)
    if len(dnsnames) > 1:
        raise CertificateError("hostname %r "
            "doesn't match either of %s"
            % (hostname, ', '.join(map(repr, dnsnames))))
    elif len(dnsnames) == 1:
        raise CertificateError("hostname %r "
            "doesn't match %r"
            % (hostname, dnsnames[0]))
    else:
        raise CertificateError("no appropriate commonName or "
            "subjectAltName fields were found")

DefaultVerifyPaths = namedtuple("DefaultVerifyPaths",
    "cafile capath openssl_cafile_env openssl_cafile openssl_capath_env "
    "openssl_capath")

def get_default_verify_paths():
    """Return paths to default cafile and capath.
    """
    parts = _ssl.get_default_verify_paths()

# environment vars shadow paths
    cafile = os.environ.get(parts[0], parts[1])
    capath = os.environ.get(parts[2], parts[3])

return DefaultVerifyPaths(cafile if os.path.isfile(cafile) else None,
                              capath if os.path.isdir(capath) else None,
                              *parts)

class _ASN1Object(namedtuple("_ASN1Object", "nid shortname longname oid")):
    """ASN.1 object identifier lookup
    """
    __slots__ = ()

def __new__(cls, oid):
        return super().__new__(cls, *_txt2obj(oid, name=False))

@classmethod
    def fromnid(cls, nid):
        """Create _ASN1Object from OpenSSL numeric ID
        """
        return super().__new__(cls, *_nid2obj(nid))

@classmethod
    def fromname(cls, name):
        """Create _ASN1Object from short name, long name or OID
        """
        return super().__new__(cls, *_txt2obj(name, name=True))

class Purpose(_ASN1Object, _Enum):
    """SSLContext purpose flags with X509v3 Extended Key Usage objects
    """
    SERVER_AUTH = '1.3.6.1.5.5.7.3.1'
    CLIENT_AUTH = '1.3.6.1.5.5.7.3.2'

class SSLContext(_SSLContext):
    """An SSLContext holds various SSL-related configuration options and
    data, such as certificates and possibly a private key."""
    _windows_cert_stores = ("CA", "ROOT")

sslsocket_class = None  # SSLSocket is assigned later.
    sslobject_class = None  # SSLObject is assigned later.

def __new__(cls, protocol=PROTOCOL_TLS, *args, **kwargs):
        self = _SSLContext.__new__(cls, protocol)
        return self

def _encode_hostname(self, hostname):
        if hostname is None:
            return None
        elif isinstance(hostname, str):
            return hostname.encode('idna').decode('ascii')
        else:
            return hostname.decode('ascii')

def wrap_socket(self, sock, server_side=False,
                    do_handshake_on_connect=True,
                    suppress_ragged_eofs=True,
                    server_hostname=None, session=None):
        # SSLSocket class handles server_hostname encoding before it calls
        # ctx._wrap_socket()
        return self.sslsocket_class._create(
            sock=sock,
            server_side=server_side,
            do_handshake_on_connect=do_handshake_on_connect,
            suppress_ragged_eofs=suppress_ragged_eofs,
            server_hostname=server_hostname,
            context=self,
            session=session
        )

def wrap_bio(self, incoming, outgoing, server_side=False,
                 server_hostname=None, session=None):
        # Need to encode server_hostname here because _wrap_bio() can only
        # handle ASCII str.
        return self.sslobject_class._create(
            incoming, outgoing, server_side=server_side,
            server_hostname=self._encode_hostname(server_hostname),
            session=session, context=self,
        )

def set_npn_protocols(self, npn_protocols):
        protos = bytearray()
        for protocol in npn_protocols:
            b = bytes(protocol, 'ascii')
            if len(b) == 0 or len(b) > 255:
                raise SSLError('NPN protocols must be 1 to 255 in length')
            protos.append(len(b))
            protos.extend(b)

self._set_npn_protocols(protos)

def set_servername_callback(self, server_name_callback):
        if server_name_callback is None:
            self.sni_callback = None
        else:
            if not callable(server_name_callback):
                raise TypeError("not a callable object")

def shim_cb(sslobj, servername, sslctx):
                servername = self._encode_hostname(servername)
                return server_name_callback(sslobj, servername, sslctx)

self.sni_callback = shim_cb

def set_alpn_protocols(self, alpn_protocols):
        protos = bytearray()
        for protocol in alpn_protocols:
            b = bytes(protocol, 'ascii')
            if len(b) == 0 or len(b) > 255:
                raise SSLError('ALPN protocols must be 1 to 255 in length')
            protos.append(len(b))
            protos.extend(b)

self._set_alpn_protocols(protos)

def _load_windows_store_certs(self, storename, purpose):
        certs = bytearray()
        try:
            for cert, encoding, trust in enum_certificates(storename):
                # CA certs are never PKCS#7 encoded
                if encoding == "x509_asn":
                    if trust is True or purpose.oid in trust:
                        certs.extend(cert)
        except PermissionError:
            warnings.warn("unable to enumerate Windows certificate store")
        if certs:
            self.load_verify_locations(cadata=certs)
        return certs

def load_default_certs(self, purpose=Purpose.SERVER_AUTH):
        if not isinstance(purpose, _ASN1Object):
            raise TypeError(purpose)
        if sys.platform == "win32":
            for storename in self._windows_cert_stores:
                self._load_windows_store_certs(storename, purpose)
        self.set_default_verify_paths()

if hasattr(_SSLContext, 'minimum_version'):
        @property
        def minimum_version(self):
            return TLSVersion(super().minimum_version)

@minimum_version.setter
        def minimum_version(self, value):
            if value == TLSVersion.SSLv3:
                self.options &= ~Options.OP_NO_SSLv3
            super(SSLContext, SSLContext).minimum_version.__set__(self, value)

@property
        def maximum_version(self):
            return TLSVersion(super().maximum_version)

@maximum_version.setter
        def maximum_version(self, value):
            super(SSLContext, SSLContext).maximum_version.__set__(self, value)

@property
    def options(self):
        return Options(super().options)

@options.setter
    def options(self, value):
        super(SSLContext, SSLContext).options.__set__(self, value)

if hasattr(_ssl, 'HOSTFLAG_NEVER_CHECK_SUBJECT'):
        @property
        def hostname_checks_common_name(self):
            ncs = self._host_flags & _ssl.HOSTFLAG_NEVER_CHECK_SUBJECT
            return ncs != _ssl.HOSTFLAG_NEVER_CHECK_SUBJECT

@hostname_checks_common_name.setter
        def hostname_checks_common_name(self, value):
            if value:
                self._host_flags &= ~_ssl.HOSTFLAG_NEVER_CHECK_SUBJECT
            else:
                self._host_flags |= _ssl.HOSTFLAG_NEVER_CHECK_SUBJECT
    else:
        @property
        def hostname_checks_common_name(self):
            return True

@property
    def protocol(self):
        return _SSLMethod(super().protocol)

@property
    def verify_flags(self):
        return VerifyFlags(super().verify_flags)

@verify_flags.setter
    def verify_flags(self, value):
        super(SSLContext, SSLContext).verify_flags.__set__(self, value)

@property
    def verify_mode(self):
        value = super().verify_mode
        try:
            return VerifyMode(value)
        except ValueError:
            return value

@verify_mode.setter
    def verify_mode(self, value):
        super(SSLContext, SSLContext).verify_mode.__set__(self, value)

def create_default_context(purpose=Purpose.SERVER_AUTH, *, cafile=None,
                           capath=None, cadata=None):
    """Create a SSLContext object with default settings.

NOTE: The protocol and settings may change anytime without prior
          deprecation. The values represent a fair balance between maximum
          compatibility and security.
    """
    if not isinstance(purpose, _ASN1Object):
        raise TypeError(purpose)

# SSLContext sets OP_NO_SSLv2, OP_NO_SSLv3, OP_NO_COMPRESSION,
    # OP_CIPHER_SERVER_PREFERENCE, OP_SINGLE_DH_USE and OP_SINGLE_ECDH_USE
    # by default.
    context = SSLContext(PROTOCOL_TLS)

if purpose == Purpose.SERVER_AUTH:
        # verify certs and host name in client mode
        context.verify_mode = CERT_REQUIRED
        context.check_hostname = True

if cafile or capath or cadata:
        context.load_verify_locations(cafile, capath, cadata)
    elif context.verify_mode != CERT_NONE:
        # no explicit cafile, capath or cadata but the verify mode is
        # CERT_OPTIONAL or CERT_REQUIRED. Let's try to load default system
        # root CA certificates for the given purpose. This may fail silently.
        context.load_default_certs(purpose)
    return context

def _create_unverified_context(protocol=PROTOCOL_TLS, *, cert_reqs=CERT_NONE,
                           check_hostname=False, purpose=Purpose.SERVER_AUTH,
                           certfile=None, keyfile=None,
                           cafile=None, capath=None, cadata=None):
    """Create a SSLContext object for Python stdlib modules

All Python stdlib modules shall use this function to create SSLContext
    objects in order to keep common settings in one place. The configuration
    is less restrict than create_default_context()'s to increase backward
    compatibility.
    """
    if not isinstance(purpose, _ASN1Object):
        raise TypeError(purpose)

# SSLContext sets OP_NO_SSLv2, OP_NO_SSLv3, OP_NO_COMPRESSION,
    # OP_CIPHER_SERVER_PREFERENCE, OP_SINGLE_DH_USE and OP_SINGLE_ECDH_USE
    # by default.
    context = SSLContext(protocol)

if not check_hostname:
        context.check_hostname = False
    if cert_reqs is not None:
        context.verify_mode = cert_reqs
    if check_hostname:
        context.check_hostname = True

if keyfile and not certfile:
        raise ValueError("certfile must be specified")
    if certfile or keyfile:
        context.load_cert_chain(certfile, keyfile)

# load CA root certs
    if cafile or capath or cadata:
        context.load_verify_locations(cafile, capath, cadata)
    elif context.verify_mode != CERT_NONE:
        # no explicit cafile, capath or cadata but the verify mode is
        # CERT_OPTIONAL or CERT_REQUIRED. Let's try to load default system
        # root CA certificates for the given purpose. This may fail silently.
        context.load_default_certs(purpose)

return context

# Used by http.client if no context is explicitly passed.
_create_default_https_context = create_default_context

# Backwards compatibility alias, even though it's not a public name.
_create_stdlib_context = _create_unverified_context

class SSLObject:
    """This class implements an interface on top of a low-level SSL object as
    implemented by OpenSSL. This object captures the state of an SSL connection
    but does not provide any network IO itself. IO needs to be performed
    through separate "BIO" objects which are OpenSSL's IO abstraction layer.

This class does not have a public constructor. Instances are returned by
    ``SSLContext.wrap_bio``. This class is typically used by framework authors
    that want to implement asynchronous IO for SSL through memory buffers.

When compared to ``SSLSocket``, this object lacks the following features:

* Any form of network IO, including methods such as ``recv`` and ``send``.
     * The ``do_handshake_on_connect`` and ``suppress_ragged_eofs`` machinery.
    """
    def __init__(self, *args, **kwargs):
        raise TypeError(
            f"{self.__class__.__name__} does not have a public "
            f"constructor. Instances are returned by SSLContext.wrap_bio()."
        )

@classmethod
    def _create(cls, incoming, outgoing, server_side=False,
                 server_hostname=None, session=None, context=None):
        self = cls.__new__(cls)
        sslobj = context._wrap_bio(
            incoming, outgoing, server_side=server_side,
            server_hostname=server_hostname,
            owner=self, session=session
        )
        self._sslobj = sslobj
        return self

@property
    def context(self):
        """The SSLContext that is currently in use."""
        return self._sslobj.context

@context.setter
    def context(self, ctx):
        self._sslobj.context = ctx

@property
    def session(self):
        """The SSLSession for client socket."""
        return self._sslobj.session

@session.setter
    def session(self, session):
        self._sslobj.session = session

@property
    def session_reused(self):
        """Was the client session reused during handshake"""
        return self._sslobj.session_reused

@property
    def server_side(self):
        """Whether this is a server-side socket."""
        return self._sslobj.server_side

@property
    def server_hostname(self):
        """The currently set server hostname (for SNI), or ``None`` if no
        server hostame is set."""
        return self._sslobj.server_hostname

def read(self, len=1024, buffer=None):
        """Read up to 'len' bytes from the SSL object and return them.

If 'buffer' is provided, read into this buffer and return the number of
        bytes read.
        """
        if buffer is not None:
            v = self._sslobj.read(len, buffer)
        else:
            v = self._sslobj.read(len)
        return v

def write(self, data):
        """Write 'data' to the SSL object and return the number of bytes
        written.

The 'data' argument must support the buffer interface.
        """
        return self._sslobj.write(data)

def getpeercert(self, binary_form=False):
        """Returns a formatted version of the data in the certificate provided
        by the other end of the SSL channel.

Return None if no certificate was provided, {} if a certificate was
        provided, but not validated.
        """
        return self._sslobj.getpeercert(binary_form)

def selected_npn_protocol(self):
        """Return the currently selected NPN protocol as a string, or ``None``
        if a next protocol was not negotiated or if NPN is not supported by one
        of the peers."""
        if _ssl.HAS_NPN:
            return self._sslobj.selected_npn_protocol()

def selected_alpn_protocol(self):
        """Return the currently selected ALPN protocol as a string, or ``None``
        if a next protocol was not negotiated or if ALPN is not supported by one
        of the peers."""
        if _ssl.HAS_ALPN:
            return self._sslobj.selected_alpn_protocol()

def cipher(self):
        """Return the currently selected cipher as a 3-tuple ``(name,
        ssl_version, secret_bits)``."""
        return self._sslobj.cipher()

def shared_ciphers(self):
        """Return a list of ciphers shared by the client during the handshake or
        None if this is not a valid server connection.
        """
        return self._sslobj.shared_ciphers()

def compression(self):
        """Return the current compression algorithm in use, or ``None`` if
        compression was not negotiated or not supported by one of the peers."""
        return self._sslobj.compression()

def pending(self):
        """Return the number of bytes that can be read immediately."""
        return self._sslobj.pending()

def do_handshake(self):
        """Start the SSL/TLS handshake."""
        self._sslobj.do_handshake()

def unwrap(self):
        """Start the SSL shutdown handshake."""
        return self._sslobj.shutdown()

def get_channel_binding(self, cb_type="tls-unique"):
        """Get channel binding data for current connection.  Raise ValueError
        if the requested `cb_type` is not supported.  Return bytes of the data
        or None if the data is not available (e.g. before the handshake)."""
        return self._sslobj.get_channel_binding(cb_type)

def version(self):
        """Return a string identifying the protocol version used by the
        current SSL channel. """
        return self._sslobj.version()

def verify_client_post_handshake(self):
        return self._sslobj.verify_client_post_handshake()

def _sslcopydoc(func):
    """Copy docstring from SSLObject to SSLSocket"""
    func.__doc__ = getattr(SSLObject, func.__name__).__doc__
    return func

class SSLSocket(socket):
    """This class implements a subtype of socket.socket that wraps
    the underlying OS socket in an SSL context when necessary, and
    provides read and write methods over that channel. """

def __init__(self, *args, **kwargs):
        raise TypeError(
            f"{self.__class__.__name__} does not have a public "
            f"constructor. Instances are returned by "
            f"SSLContext.wrap_socket()."
        )

@classmethod
    def _create(cls, sock, server_side=False, do_handshake_on_connect=True,
                suppress_ragged_eofs=True, server_hostname=None,
                context=None, session=None):
        if sock.getsockopt(SOL_SOCKET, SO_TYPE) != SOCK_STREAM:
            raise NotImplementedError("only stream sockets are supported")
        if server_side:
            if server_hostname:
                raise ValueError("server_hostname can only be specified "
                                 "in client mode")
            if session is not None:
                raise ValueError("session can only be specified in "
                                 "client mode")
        if context.check_hostname and not server_hostname:
            raise ValueError("check_hostname requires server_hostname")

kwargs = dict(
            family=sock.family, type=sock.type, proto=sock.proto,
            fileno=sock.fileno()
        )
        self = cls.__new__(cls, **kwargs)
        super(SSLSocket, self).__init__(**kwargs)
        self.settimeout(sock.gettimeout())
        sock.detach()

self._context = context
        self._session = session
        self._closed = False
        self._sslobj = None
        self.server_side = server_side
        self.server_hostname = context._encode_hostname(server_hostname)
        self.do_handshake_on_connect = do_handshake_on_connect
        self.suppress_ragged_eofs = suppress_ragged_eofs

# See if we are connected
        try:
            self.getpeername()
        except OSError as e:
            if e.errno != errno.ENOTCONN:
                raise
            connected = False
        else:
            connected = True

self._connected = connected
        if connected:
            # create the SSL object
            try:
                self._sslobj = self._context._wrap_socket(
                    self, server_side, self.server_hostname,
                    owner=self, session=self._session,
                )
                if do_handshake_on_connect:
                    timeout = self.gettimeout()
                    if timeout == 0.0:
                        # non-blocking
                        raise ValueError("do_handshake_on_connect should not be specified for non-blocking sockets")
                    self.do_handshake()
            except (OSError, ValueError):
                self.close()
                raise
        return self

@property
    @_sslcopydoc
    def context(self):
        return self._context

@context.setter
    def context(self, ctx):
        self._context = ctx
        self._sslobj.context = ctx

@property
    @_sslcopydoc
    def session(self):
        if self._sslobj is not None:
            return self._sslobj.session

@session.setter
    def session(self, session):
        self._session = session
        if self._sslobj is not None:
            self._sslobj.session = session

@property
    @_sslcopydoc
    def session_reused(self):
        if self._sslobj is not None:
            return self._sslobj.session_reused

def dup(self):
        raise NotImplementedError("Can't dup() %s instances" %
                                  self.__class__.__name__)

def _checkClosed(self, msg=None):
        # raise an exception here if you wish to check for spurious closes
        pass

def _check_connected(self):
        if not self._connected:
            # getpeername() will raise ENOTCONN if the socket is really
            # not connected; note that we can be connected even without
            # _connected being set, e.g. if connect() first returned
            # EAGAIN.
            self.getpeername()

def read(self, len=1024, buffer=None):
        """Read up to LEN bytes and return them.
        Return zero-length string on EOF."""

self._checkClosed()
        if self._sslobj is None:
            raise ValueError("Read on closed or unwrapped SSL socket.")
        try:
            if buffer is not None:
                return self._sslobj.read(len, buffer)
            else:
                return self._sslobj.read(len)
        except SSLError as x:
            if x.args[0] == SSL_ERROR_EOF and self.suppress_ragged_eofs:
                if buffer is not None:
                    return 0
                else:
                    return b''
            else:
                raise

def write(self, data):
        """Write DATA to the underlying SSL channel.  Returns
        number of bytes of DATA actually transmitted."""

self._checkClosed()
        if self._sslobj is None:
            raise ValueError("Write on closed or unwrapped SSL socket.")
        return self._sslobj.write(data)

@_sslcopydoc
    def getpeercert(self, binary_form=False):
        self._checkClosed()
        self._check_connected()
        return self._sslobj.getpeercert(binary_form)

@_sslcopydoc
    def selected_npn_protocol(self):
        self._checkClosed()
        if self._sslobj is None or not _ssl.HAS_NPN:
            return None
        else:
            return self._sslobj.selected_npn_protocol()

@_sslcopydoc
    def selected_alpn_protocol(self):
        self._checkClosed()
        if self._sslobj is None or not _ssl.HAS_ALPN:
            return None
        else:
            return self._sslobj.selected_alpn_protocol()

@_sslcopydoc
    def cipher(self):
        self._checkClosed()
        if self._sslobj is None:
            return None
        else:
            return self._sslobj.cipher()

@_sslcopydoc
    def shared_ciphers(self):
        self._checkClosed()
        if self._sslobj is None:
            return None
        else:
            return self._sslobj.shared_ciphers()

@_sslcopydoc
    def compression(self):
        self._checkClosed()
        if self._sslobj is None:
            return None
        else:
            return self._sslobj.compression()

def send(self, data, flags=0):
        self._checkClosed()
        if self._sslobj is not None:
            if flags != 0:
                raise ValueError(
                    "non-zero flags not allowed in calls to send() on %s" %
                    self.__class__)
            return self._sslobj.write(data)
        else:
            return super().send(data, flags)

def sendto(self, data, flags_or_addr, addr=None):
        self._checkClosed()
        if self._sslobj is not None:
            raise ValueError("sendto not allowed on instances of %s" %
                             self.__class__)
        elif addr is None:
            return super().sendto(data, flags_or_addr)
        else:
            return super().sendto(data, flags_or_addr, addr)

def sendmsg(self, *args, **kwargs):
        # Ensure programs don't send data unencrypted if they try to
        # use this method.
        raise NotImplementedError("sendmsg not allowed on instances of %s" %
                                  self.__class__)

def sendall(self, data, flags=0):
        self._checkClosed()
        if self._sslobj is not None:
            if flags != 0:
                raise ValueError(
                    "non-zero flags not allowed in calls to sendall() on %s" %
                    self.__class__)
            count = 0
            with memoryview(data) as view, view.cast("B") as byte_view:
                amount = len(byte_view)
                while count < amount:
                    v = self.send(byte_view[count:])
                    count += v
        else:
            return super().sendall(data, flags)

def sendfile(self, file, offset=0, count=None):
        """Send a file, possibly by using os.sendfile() if this is a
        clear-text socket.  Return the total number of bytes sent.
        """
        if self._sslobj is not None:
            return self._sendfile_use_send(file, offset, count)
        else:
            # os.sendfile() works with plain sockets only
            return super().sendfile(file, offset, count)

def recv(self, buflen=1024, flags=0):
        self._checkClosed()
        if self._sslobj is not None:
            if flags != 0:
                raise ValueError(
                    "non-zero flags not allowed in calls to recv() on %s" %
                    self.__class__)
            return self.read(buflen)
        else:
            return super().recv(buflen, flags)

def recv_into(self, buffer, nbytes=None, flags=0):
        self._checkClosed()
        if buffer and (nbytes is None):
            nbytes = len(buffer)
        elif nbytes is None:
            nbytes = 1024
        if self._sslobj is not None:
            if flags != 0:
                raise ValueError(
                  "non-zero flags not allowed in calls to recv_into() on %s" %
                  self.__class__)
            return self.read(nbytes, buffer)
        else:
            return super().recv_into(buffer, nbytes, flags)

def recvfrom(self, buflen=1024, flags=0):
        self._checkClosed()
        if self._sslobj is not None:
            raise ValueError("recvfrom not allowed on instances of %s" %
                             self.__class__)
        else:
            return super().recvfrom(buflen, flags)

def recvfrom_into(self, buffer, nbytes=None, flags=0):
        self._checkClosed()
        if self._sslobj is not None:
            raise ValueError("recvfrom_into not allowed on instances of %s" %
                             self.__class__)
        else:
            return super().recvfrom_into(buffer, nbytes, flags)

def recvmsg(self, *args, **kwargs):
        raise NotImplementedError("recvmsg not allowed on instances of %s" %
                                  self.__class__)

def recvmsg_into(self, *args, **kwargs):
        raise NotImplementedError("recvmsg_into not allowed on instances of "
                                  "%s" % self.__class__)

@_sslcopydoc
    def pending(self):
        self._checkClosed()
        if self._sslobj is not None:
            return self._sslobj.pending()
        else:
            return 0

def shutdown(self, how):
        self._checkClosed()
        self._sslobj = None
        super().shutdown(how)

@_sslcopydoc
    def unwrap(self):
        if self._sslobj:
            s = self._sslobj.shutdown()
            self._sslobj = None
            return s
        else:
            raise ValueError("No SSL wrapper around " + str(self))

@_sslcopydoc
    def verify_client_post_handshake(self):
        if self._sslobj:
            return self._sslobj.verify_client_post_handshake()
        else:
            raise ValueError("No SSL wrapper around " + str(self))

def _real_close(self):
        self._sslobj = None
        super()._real_close()

@_sslcopydoc
    def do_handshake(self, block=False):
        self._check_connected()
        timeout = self.gettimeout()
        try:
            if timeout == 0.0 and block:
                self.settimeout(None)
            self._sslobj.do_handshake()
        finally:
            self.settimeout(timeout)

def _real_connect(self, addr, connect_ex):
        if self.server_side:
            raise ValueError("can't connect in server-side mode")
        # Here we assume that the socket is client-side, and not
        # connected at the time of the call.  We connect it, then wrap it.
        if self._connected or self._sslobj is not None:
            raise ValueError("attempt to connect already-connected SSLSocket!")
        self._sslobj = self.context._wrap_socket(
            self, False, self.server_hostname,
            owner=self, session=self._session
        )
        try:
            if connect_ex:
                rc = super().connect_ex(addr)
            else:
                rc = None
                super().connect(addr)
            if not rc:
                self._connected = True
                if self.do_handshake_on_connect:
                    self.do_handshake()
            return rc
        except (OSError, ValueError):
            self._sslobj = None
            raise

def connect(self, addr):
        """Connects to remote ADDR, and then wraps the connection in
        an SSL channel."""
        self._real_connect(addr, False)

def connect_ex(self, addr):
        """Connects to remote ADDR, and then wraps the connection in
        an SSL channel."""
        return self._real_connect(addr, True)

def accept(self):
        """Accepts a new connection from a remote client, and returns
        a tuple containing that new connection wrapped with a server-side
        SSL channel, and the address of the remote client."""

newsock, addr = super().accept()
        newsock = self.context.wrap_socket(newsock,
                    do_handshake_on_connect=self.do_handshake_on_connect,
                    suppress_ragged_eofs=self.suppress_ragged_eofs,
                    server_side=True)
        return newsock, addr

@_sslcopydoc
    def get_channel_binding(self, cb_type="tls-unique"):
        if self._sslobj is not None:
            return self._sslobj.get_channel_binding(cb_type)
        else:
            if cb_type not in CHANNEL_BINDING_TYPES:
                raise ValueError(
                    "{0} channel binding type not implemented".format(cb_type)
                )
            return None

@_sslcopydoc
    def version(self):
        if self._sslobj is not None:
            return self._sslobj.version()
        else:
            return None

# Python does not support forward declaration of types.
SSLContext.sslsocket_class = SSLSocket
SSLContext.sslobject_class = SSLObject

def wrap_socket(sock, keyfile=None, certfile=None,
                server_side=False, cert_reqs=CERT_NONE,
                ssl_version=PROTOCOL_TLS, ca_certs=None,
                do_handshake_on_connect=True,
                suppress_ragged_eofs=True,
                ciphers=None):

if server_side and not certfile:
        raise ValueError("certfile must be specified for server-side "
                         "operations")
    if keyfile and not certfile:
        raise ValueError("certfile must be specified")
    context = SSLContext(ssl_version)
    context.verify_mode = cert_reqs
    if ca_certs:
        context.load_verify_locations(ca_certs)
    if certfile:
        context.load_cert_chain(certfile, keyfile)
    if ciphers:
        context.set_ciphers(ciphers)
    return context.wrap_socket(
        sock=sock, server_side=server_side,
        do_handshake_on_connect=do_handshake_on_connect,
        suppress_ragged_eofs=suppress_ragged_eofs
    )

# some utility functions

def cert_time_to_seconds(cert_time):
    """Return the time in seconds since the Epoch, given the timestring
    representing the "notBefore" or "notAfter" date from a certificate
    in ``"%b %d %H:%M:%S %Y %Z"`` strptime format (C locale).

"notBefore" or "notAfter" dates must use UTC (RFC 5280).

Month is one of: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    UTC should be specified as GMT (see ASN1_TIME_print())
    """
    from time import strptime
    from calendar import timegm

months = (
        "Jan","Feb","Mar","Apr","May","Jun",
        "Jul","Aug","Sep","Oct","Nov","Dec"
    )
    time_format = ' %d %H:%M:%S %Y GMT' # NOTE: no month, fixed GMT
    try:
        month_number = months.index(cert_time[:3].title()) + 1
    except ValueError:
        raise ValueError('time data %r does not match '
                         'format "%%b%s"' % (cert_time, time_format))
    else:
        # found valid month
        tt = strptime(cert_time[3:], time_format)
        # return an integer, the previous mktime()-based implementation
        # returned a float (fractional seconds are always zero here).
        return timegm((tt[0], month_number) + tt[2:6])

PEM_HEADER = "-----BEGIN CERTIFICATE-----"
PEM_FOOTER = "-----END CERTIFICATE-----"

def DER_cert_to_PEM_cert(der_cert_bytes):
    """Takes a certificate in binary DER format and returns the
    PEM version of it as a string."""

f = str(base64.standard_b64encode(der_cert_bytes), 'ASCII', 'strict')
    ss = [PEM_HEADER]
    ss += [f[i:i+64] for i in range(0, len(f), 64)]
    ss.append(PEM_FOOTER + '\n')
    return '\n'.join(ss)

def PEM_cert_to_DER_cert(pem_cert_string):
    """Takes a certificate in ASCII PEM format and returns the
    DER-encoded version of it as a byte sequence"""

if not pem_cert_string.startswith(PEM_HEADER):
        raise ValueError("Invalid PEM encoding; must start with %s"
                         % PEM_HEADER)
    if not pem_cert_string.strip().endswith(PEM_FOOTER):
        raise ValueError("Invalid PEM encoding; must end with %s"
                         % PEM_FOOTER)
    d = pem_cert_string.strip()[len(PEM_HEADER):-len(PEM_FOOTER)]
    return base64.decodebytes(d.encode('ASCII', 'strict'))

def get_server_certificate(addr, ssl_version=PROTOCOL_TLS, ca_certs=None):
    """Retrieve the certificate from the server at the specified address,
    and return it as a PEM-encoded string.
    If 'ca_certs' is specified, validate the server cert against it.
    If 'ssl_version' is specified, use it in the connection attempt."""

host, port = addr
    if ca_certs is not None:
        cert_reqs = CERT_REQUIRED
    else:
        cert_reqs = CERT_NONE
    context = _create_stdlib_context(ssl_version,
                                     cert_reqs=cert_reqs,
                                     cafile=ca_certs)
    with  create_connection(addr) as sock:
        with context.wrap_socket(sock) as sslsock:
            dercert = sslsock.getpeercert(True)
    return DER_cert_to_PEM_cert(dercert)

def get_protocol_name(protocol_code):
    return _PROTOCOL_NAMES.get(protocol_code, '<unknown>')

cmd: