Adding upstream version 0.12.1+dfsg.upstream/0.12.1+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 2081 insertions, 0 deletions

diff --git a/examples/tests/ngtcp2test/__init__.py b/examples/tests/ngtcp2test/__init__.py
new file mode 100644
index 0000000..65c61d8
--- /dev/null
+++ b/examples/tests/ngtcp2test/__init__.py
@@ -0,0 +1,6 @@
+from .env import Env, CryptoLib
+from .log import LogFile
+from .client import ExampleClient, ClientRun
+from .server import ExampleServer, ServerRun
+from .certs import Ngtcp2TestCA, Credentials
+from .tls import HandShake, HSRecord
diff --git a/examples/tests/ngtcp2test/certs.py b/examples/tests/ngtcp2test/certs.py
new file mode 100644
index 0000000..3ab6260
--- /dev/null
+++ b/examples/tests/ngtcp2test/certs.py
@@ -0,0 +1,476 @@
+import os
+import re
+from datetime import timedelta, datetime
+from typing import List, Any, Optional
+
+from cryptography import x509
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.asymmetric import ec, rsa
+from cryptography.hazmat.primitives.asymmetric.ec import EllipticCurvePrivateKey
+from cryptography.hazmat.primitives.asymmetric.rsa import RSAPrivateKey
+from cryptography.hazmat.primitives.serialization import Encoding, PrivateFormat, NoEncryption, load_pem_private_key
+from cryptography.x509 import ExtendedKeyUsageOID, NameOID
+
+
+EC_SUPPORTED = {}
+EC_SUPPORTED.update([(curve.name.upper(), curve) for curve in [
+    ec.SECP192R1,
+    ec.SECP224R1,
+    ec.SECP256R1,
+    ec.SECP384R1,
+]])
+
+
+def _private_key(key_type):
+    if isinstance(key_type, str):
+        key_type = key_type.upper()
+        m = re.match(r'^(RSA)?(\d+)$', key_type)
+        if m:
+            key_type = int(m.group(2))
+
+    if isinstance(key_type, int):
+        return rsa.generate_private_key(
+            public_exponent=65537,
+            key_size=key_type,
+            backend=default_backend()
+        )
+    if not isinstance(key_type, ec.EllipticCurve) and key_type in EC_SUPPORTED:
+        key_type = EC_SUPPORTED[key_type]
+    return ec.generate_private_key(
+        curve=key_type,
+        backend=default_backend()
+    )
+
+
+class CertificateSpec:
+
+    def __init__(self, name: str = None, domains: List[str] = None,
+                 email: str = None,
+                 key_type: str = None, single_file: bool = False,
+                 valid_from: timedelta = timedelta(days=-1),
+                 valid_to: timedelta = timedelta(days=89),
+                 client: bool = False,
+                 sub_specs: List['CertificateSpec'] = None):
+        self._name = name
+        self.domains = domains
+        self.client = client
+        self.email = email
+        self.key_type = key_type
+        self.single_file = single_file
+        self.valid_from = valid_from
+        self.valid_to = valid_to
+        self.sub_specs = sub_specs
+
+    @property
+    def name(self) -> Optional[str]:
+        if self._name:
+            return self._name
+        elif self.domains:
+            return self.domains[0]
+        return None
+
+    @property
+    def type(self) -> Optional[str]:
+        if self.domains and len(self.domains):
+            return "server"
+        elif self.client:
+            return "client"
+        elif self.name:
+            return "ca"
+        return None
+
+
+class Credentials:
+
+    def __init__(self, name: str, cert: Any, pkey: Any, issuer: 'Credentials' = None):
+        self._name = name
+        self._cert = cert
+        self._pkey = pkey
+        self._issuer = issuer
+        self._cert_file = None
+        self._pkey_file = None
+        self._store = None
+
+    @property
+    def name(self) -> str:
+        return self._name
+
+    @property
+    def subject(self) -> x509.Name:
+        return self._cert.subject
+
+    @property
+    def key_type(self):
+        if isinstance(self._pkey, RSAPrivateKey):
+            return f"rsa{self._pkey.key_size}"
+        elif isinstance(self._pkey, EllipticCurvePrivateKey):
+            return f"{self._pkey.curve.name}"
+        else:
+            raise Exception(f"unknown key type: {self._pkey}")
+
+    @property
+    def private_key(self) -> Any:
+        return self._pkey
+
+    @property
+    def certificate(self) -> Any:
+        return self._cert
+
+    @property
+    def cert_pem(self) -> bytes:
+        return self._cert.public_bytes(Encoding.PEM)
+
+    @property
+    def pkey_pem(self) -> bytes:
+        return self._pkey.private_bytes(
+            Encoding.PEM,
+            PrivateFormat.TraditionalOpenSSL if self.key_type.startswith('rsa') else PrivateFormat.PKCS8,
+            NoEncryption())
+
+    @property
+    def issuer(self) -> Optional['Credentials']:
+        return self._issuer
+
+    def set_store(self, store: 'CertStore'):
+        self._store = store
+
+    def set_files(self, cert_file: str, pkey_file: str = None):
+        self._cert_file = cert_file
+        self._pkey_file = pkey_file
+
+    @property
+    def cert_file(self) -> str:
+        return self._cert_file
+
+    @property
+    def pkey_file(self) -> Optional[str]:
+        return self._pkey_file
+
+    def get_first(self, name) -> Optional['Credentials']:
+        creds = self._store.get_credentials_for_name(name) if self._store else []
+        return creds[0] if len(creds) else None
+
+    def get_credentials_for_name(self, name) -> List['Credentials']:
+        return self._store.get_credentials_for_name(name) if self._store else []
+
+    def issue_certs(self, specs: List[CertificateSpec],
+                    chain: List['Credentials'] = None) -> List['Credentials']:
+        return [self.issue_cert(spec=spec, chain=chain) for spec in specs]
+
+    def issue_cert(self, spec: CertificateSpec, chain: List['Credentials'] = None) -> 'Credentials':
+        key_type = spec.key_type if spec.key_type else self.key_type
+        creds = None
+        if self._store:
+            creds = self._store.load_credentials(
+                name=spec.name, key_type=key_type, single_file=spec.single_file, issuer=self)
+        if creds is None:
+            creds = Ngtcp2TestCA.create_credentials(spec=spec, issuer=self, key_type=key_type,
+                                                    valid_from=spec.valid_from, valid_to=spec.valid_to)
+            if self._store:
+                self._store.save(creds, single_file=spec.single_file)
+                if spec.type == "ca":
+                    self._store.save_chain(creds, "ca", with_root=True)
+
+        if spec.sub_specs:
+            if self._store:
+                sub_store = CertStore(fpath=os.path.join(self._store.path, creds.name))
+                creds.set_store(sub_store)
+            subchain = chain.copy() if chain else []
+            subchain.append(self)
+            creds.issue_certs(spec.sub_specs, chain=subchain)
+        return creds
+
+
+class CertStore:
+
+    def __init__(self, fpath: str):
+        self._store_dir = fpath
+        if not os.path.exists(self._store_dir):
+            os.makedirs(self._store_dir)
+        self._creds_by_name = {}
+
+    @property
+    def path(self) -> str:
+        return self._store_dir
+
+    def save(self, creds: Credentials, name: str = None,
+             chain: List[Credentials] = None,
+             single_file: bool = False) -> None:
+        name = name if name is not None else creds.name
+        cert_file = self.get_cert_file(name=name, key_type=creds.key_type)
+        pkey_file = self.get_pkey_file(name=name, key_type=creds.key_type)
+        if single_file:
+            pkey_file = None
+        with open(cert_file, "wb") as fd:
+            fd.write(creds.cert_pem)
+            if chain:
+                for c in chain:
+                    fd.write(c.cert_pem)
+            if pkey_file is None:
+                fd.write(creds.pkey_pem)
+        if pkey_file is not None:
+            with open(pkey_file, "wb") as fd:
+                fd.write(creds.pkey_pem)
+        creds.set_files(cert_file, pkey_file)
+        self._add_credentials(name, creds)
+
+    def save_chain(self, creds: Credentials, infix: str, with_root=False):
+        name = creds.name
+        chain = [creds]
+        while creds.issuer is not None:
+            creds = creds.issuer
+            chain.append(creds)
+        if not with_root and len(chain) > 1:
+            chain = chain[:-1]
+        chain_file = os.path.join(self._store_dir, f'{name}-{infix}.pem')
+        with open(chain_file, "wb") as fd:
+            for c in chain:
+                fd.write(c.cert_pem)
+
+    def _add_credentials(self, name: str, creds: Credentials):
+        if name not in self._creds_by_name:
+            self._creds_by_name[name] = []
+        self._creds_by_name[name].append(creds)
+
+    def get_credentials_for_name(self, name) -> List[Credentials]:
+        return self._creds_by_name[name] if name in self._creds_by_name else []
+
+    def get_cert_file(self, name: str, key_type=None) -> str:
+        key_infix = ".{0}".format(key_type) if key_type is not None else ""
+        return os.path.join(self._store_dir, f'{name}{key_infix}.cert.pem')
+
+    def get_pkey_file(self, name: str, key_type=None) -> str:
+        key_infix = ".{0}".format(key_type) if key_type is not None else ""
+        return os.path.join(self._store_dir, f'{name}{key_infix}.pkey.pem')
+
+    def load_pem_cert(self, fpath: str) -> x509.Certificate:
+        with open(fpath) as fd:
+            return x509.load_pem_x509_certificate("".join(fd.readlines()).encode())
+
+    def load_pem_pkey(self, fpath: str):
+        with open(fpath) as fd:
+            return load_pem_private_key("".join(fd.readlines()).encode(), password=None)
+
+    def load_credentials(self, name: str, key_type=None, single_file: bool = False, issuer: Credentials = None):
+        cert_file = self.get_cert_file(name=name, key_type=key_type)
+        pkey_file = cert_file if single_file else self.get_pkey_file(name=name, key_type=key_type)
+        if os.path.isfile(cert_file) and os.path.isfile(pkey_file):
+            cert = self.load_pem_cert(cert_file)
+            pkey = self.load_pem_pkey(pkey_file)
+            creds = Credentials(name=name, cert=cert, pkey=pkey, issuer=issuer)
+            creds.set_store(self)
+            creds.set_files(cert_file, pkey_file)
+            self._add_credentials(name, creds)
+            return creds
+        return None
+
+
+class Ngtcp2TestCA:
+
+    @classmethod
+    def create_root(cls, name: str, store_dir: str, key_type: str = "rsa2048") -> Credentials:
+        store = CertStore(fpath=store_dir)
+        creds = store.load_credentials(name="ca", key_type=key_type, issuer=None)
+        if creds is None:
+            creds = Ngtcp2TestCA._make_ca_credentials(name=name, key_type=key_type)
+            store.save(creds, name="ca")
+            creds.set_store(store)
+        return creds
+
+    @staticmethod
+    def create_credentials(spec: CertificateSpec, issuer: Credentials, key_type: Any,
+                           valid_from: timedelta = timedelta(days=-1),
+                           valid_to: timedelta = timedelta(days=89),
+                           ) -> Credentials:
+        """Create a certificate signed by this CA for the given domains.
+        :returns: the certificate and private key PEM file paths
+        """
+        if spec.domains and len(spec.domains):
+            creds = Ngtcp2TestCA._make_server_credentials(name=spec.name, domains=spec.domains,
+                                                          issuer=issuer, valid_from=valid_from,
+                                                          valid_to=valid_to, key_type=key_type)
+        elif spec.client:
+            creds = Ngtcp2TestCA._make_client_credentials(name=spec.name, issuer=issuer,
+                                                          email=spec.email, valid_from=valid_from,
+                                                          valid_to=valid_to, key_type=key_type)
+        elif spec.name:
+            creds = Ngtcp2TestCA._make_ca_credentials(name=spec.name, issuer=issuer,
+                                                      valid_from=valid_from, valid_to=valid_to,
+                                                      key_type=key_type)
+        else:
+            raise Exception(f"unrecognized certificate specification: {spec}")
+        return creds
+
+    @staticmethod
+    def _make_x509_name(org_name: str = None, common_name: str = None, parent: x509.Name = None) -> x509.Name:
+        name_pieces = []
+        if org_name:
+            oid = NameOID.ORGANIZATIONAL_UNIT_NAME if parent else NameOID.ORGANIZATION_NAME
+            name_pieces.append(x509.NameAttribute(oid, org_name))
+        elif common_name:
+            name_pieces.append(x509.NameAttribute(NameOID.COMMON_NAME, common_name))
+        if parent:
+            name_pieces.extend([rdn for rdn in parent])
+        return x509.Name(name_pieces)
+
+    @staticmethod
+    def _make_csr(
+            subject: x509.Name,
+            pkey: Any,
+            issuer_subject: Optional[Credentials],
+            valid_from_delta: timedelta = None,
+            valid_until_delta: timedelta = None
+    ):
+        pubkey = pkey.public_key()
+        issuer_subject = issuer_subject if issuer_subject is not None else subject
+
+        valid_from = datetime.now()
+        if valid_until_delta is not None:
+            valid_from += valid_from_delta
+        valid_until = datetime.now()
+        if valid_until_delta is not None:
+            valid_until += valid_until_delta
+
+        return (
+            x509.CertificateBuilder()
+            .subject_name(subject)
+            .issuer_name(issuer_subject)
+            .public_key(pubkey)
+            .not_valid_before(valid_from)
+            .not_valid_after(valid_until)
+            .serial_number(x509.random_serial_number())
+            .add_extension(
+                x509.SubjectKeyIdentifier.from_public_key(pubkey),
+                critical=False,
+            )
+        )
+
+    @staticmethod
+    def _add_ca_usages(csr: Any) -> Any:
+        return csr.add_extension(
+            x509.BasicConstraints(ca=True, path_length=9),
+            critical=True,
+        ).add_extension(
+            x509.KeyUsage(
+                digital_signature=True,
+                content_commitment=False,
+                key_encipherment=False,
+                data_encipherment=False,
+                key_agreement=False,
+                key_cert_sign=True,
+                crl_sign=True,
+                encipher_only=False,
+                decipher_only=False),
+            critical=True
+        ).add_extension(
+            x509.ExtendedKeyUsage([
+                ExtendedKeyUsageOID.CLIENT_AUTH,
+                ExtendedKeyUsageOID.SERVER_AUTH,
+                ExtendedKeyUsageOID.CODE_SIGNING,
+            ]),
+            critical=True
+        )
+
+    @staticmethod
+    def _add_leaf_usages(csr: Any, domains: List[str], issuer: Credentials) -> Any:
+        return csr.add_extension(
+            x509.BasicConstraints(ca=False, path_length=None),
+            critical=True,
+        ).add_extension(
+            x509.AuthorityKeyIdentifier.from_issuer_subject_key_identifier(
+                issuer.certificate.extensions.get_extension_for_class(
+                    x509.SubjectKeyIdentifier).value),
+            critical=False
+        ).add_extension(
+            x509.SubjectAlternativeName([x509.DNSName(domain) for domain in domains]),
+            critical=True,
+        ).add_extension(
+            x509.ExtendedKeyUsage([
+                ExtendedKeyUsageOID.SERVER_AUTH,
+            ]),
+            critical=True
+        )
+
+    @staticmethod
+    def _add_client_usages(csr: Any, issuer: Credentials, rfc82name: str = None) -> Any:
+        cert = csr.add_extension(
+            x509.BasicConstraints(ca=False, path_length=None),
+            critical=True,
+        ).add_extension(
+            x509.AuthorityKeyIdentifier.from_issuer_subject_key_identifier(
+                issuer.certificate.extensions.get_extension_for_class(
+                    x509.SubjectKeyIdentifier).value),
+            critical=False
+        )
+        if rfc82name:
+            cert.add_extension(
+                x509.SubjectAlternativeName([x509.RFC822Name(rfc82name)]),
+                critical=True,
+            )
+        cert.add_extension(
+            x509.ExtendedKeyUsage([
+                ExtendedKeyUsageOID.CLIENT_AUTH,
+            ]),
+            critical=True
+        )
+        return cert
+
+    @staticmethod
+    def _make_ca_credentials(name, key_type: Any,
+                             issuer: Credentials = None,
+                             valid_from: timedelta = timedelta(days=-1),
+                             valid_to: timedelta = timedelta(days=89),
+                             ) -> Credentials:
+        pkey = _private_key(key_type=key_type)
+        if issuer is not None:
+            issuer_subject = issuer.certificate.subject
+            issuer_key = issuer.private_key
+        else:
+            issuer_subject = None
+            issuer_key = pkey
+        subject = Ngtcp2TestCA._make_x509_name(org_name=name, parent=issuer.subject if issuer else None)
+        csr = Ngtcp2TestCA._make_csr(subject=subject,
+                                     issuer_subject=issuer_subject, pkey=pkey,
+                                     valid_from_delta=valid_from, valid_until_delta=valid_to)
+        csr = Ngtcp2TestCA._add_ca_usages(csr)
+        cert = csr.sign(private_key=issuer_key,
+                        algorithm=hashes.SHA256(),
+                        backend=default_backend())
+        return Credentials(name=name, cert=cert, pkey=pkey, issuer=issuer)
+
+    @staticmethod
+    def _make_server_credentials(name: str, domains: List[str], issuer: Credentials,
+                                 key_type: Any,
+                                 valid_from: timedelta = timedelta(days=-1),
+                                 valid_to: timedelta = timedelta(days=89),
+                                 ) -> Credentials:
+        name = name
+        pkey = _private_key(key_type=key_type)
+        subject = Ngtcp2TestCA._make_x509_name(common_name=name, parent=issuer.subject)
+        csr = Ngtcp2TestCA._make_csr(subject=subject,
+                                     issuer_subject=issuer.certificate.subject, pkey=pkey,
+                                     valid_from_delta=valid_from, valid_until_delta=valid_to)
+        csr = Ngtcp2TestCA._add_leaf_usages(csr, domains=domains, issuer=issuer)
+        cert = csr.sign(private_key=issuer.private_key,
+                        algorithm=hashes.SHA256(),
+                        backend=default_backend())
+        return Credentials(name=name, cert=cert, pkey=pkey, issuer=issuer)
+
+    @staticmethod
+    def _make_client_credentials(name: str,
+                                 issuer: Credentials, email: Optional[str],
+                                 key_type: Any,
+                                 valid_from: timedelta = timedelta(days=-1),
+                                 valid_to: timedelta = timedelta(days=89),
+                                 ) -> Credentials:
+        pkey = _private_key(key_type=key_type)
+        subject = Ngtcp2TestCA._make_x509_name(common_name=name, parent=issuer.subject)
+        csr = Ngtcp2TestCA._make_csr(subject=subject,
+                                     issuer_subject=issuer.certificate.subject, pkey=pkey,
+                                     valid_from_delta=valid_from, valid_until_delta=valid_to)
+        csr = Ngtcp2TestCA._add_client_usages(csr, issuer=issuer, rfc82name=email)
+        cert = csr.sign(private_key=issuer.private_key,
+                        algorithm=hashes.SHA256(),
+                        backend=default_backend())
+        return Credentials(name=name, cert=cert, pkey=pkey, issuer=issuer)
diff --git a/examples/tests/ngtcp2test/client.py b/examples/tests/ngtcp2test/client.py
new file mode 100644
index 0000000..2676343
--- /dev/null
+++ b/examples/tests/ngtcp2test/client.py
@@ -0,0 +1,187 @@
+import logging
+import os
+import re
+import subprocess
+from typing import List
+
+import pytest
+
+from .server import ExampleServer, ServerRun
+from .certs import Credentials
+from .tls import HandShake, HSRecord
+from .env import Env, CryptoLib
+from .log import LogFile, HexDumpScanner
+
+
+log = logging.getLogger(__name__)
+
+
+class ClientRun:
+
+    def __init__(self, env: Env, returncode, logfile: LogFile, srun: ServerRun):
+        self.env = env
+        self.returncode = returncode
+        self.logfile = logfile
+        self.log_lines = logfile.get_recent()
+        self._data_recs = None
+        self._hs_recs = None
+        self._srun = srun
+        if self.env.verbose > 1:
+            log.debug(f'read {len(self.log_lines)} lines from {logfile.path}')
+
+    @property
+    def handshake(self) -> List[HSRecord]:
+        if self._data_recs is None:
+            crypto_line =  re.compile(r'Ordered CRYPTO data in \S+ crypto level')
+            scanner = HexDumpScanner(source=self.log_lines,
+                                     leading_regex=crypto_line)
+            self._data_recs = [data for data in scanner]
+            if self.env.verbose > 1:
+                log.debug(f'detected {len(self._data_recs)} crypto hexdumps '
+                          f'in {self.logfile.path}')
+        if self._hs_recs is None:
+            self._hs_recs = [hrec for hrec in HandShake(source=self._data_recs,
+                                                        verbose=self.env.verbose)]
+            if self.env.verbose > 1:
+                log.debug(f'detected {len(self._hs_recs)} crypto '
+                          f'records in {self.logfile.path}')
+        return self._hs_recs
+
+    @property
+    def hs_stripe(self) -> str:
+        return ":".join([hrec.name for hrec in self.handshake])
+
+    @property
+    def early_data_rejected(self) -> bool:
+        for l in self.log_lines:
+            if re.match(r'^Early data was rejected by server.*', l):
+                return True
+        return False
+
+    @property
+    def server(self) -> ServerRun:
+        return self._srun
+
+    def norm_exp(self, c_hs, s_hs, allow_hello_retry=True):
+        if allow_hello_retry and self.hs_stripe.startswith('HelloRetryRequest:'):
+            c_hs = "HelloRetryRequest:" + c_hs
+            s_hs = "ClientHello:" + s_hs
+        return c_hs, s_hs
+
+    def _assert_hs(self, c_hs, s_hs):
+        if not self.hs_stripe.startswith(c_hs):
+            # what happened?
+            if self.hs_stripe == '':
+                # server send nothing
+                if self.server.hs_stripe == '':
+                    # client send nothing
+                    pytest.fail(f'client did not send a ClientHello"')
+                else:
+                    # client send sth, but server did not respond
+                    pytest.fail(f'server did not respond to ClientHello: '
+                                f'{self.server.handshake[0].to_text()}"')
+            else:
+                pytest.fail(f'Expected "{c_hs}", got "{self.hs_stripe}"')
+        assert self.server.hs_stripe == s_hs, \
+            f'Expected "{s_hs}", got "{self.server.hs_stripe}"\n'
+
+    def assert_non_resume_handshake(self, allow_hello_retry=True):
+        # for client/server where KEY_SHARE do not match, the hello is retried
+        c_hs, s_hs = self.norm_exp(
+            "ServerHello:EncryptedExtensions:Certificate:CertificateVerify:Finished",
+            "ClientHello:Finished", allow_hello_retry=allow_hello_retry)
+        self._assert_hs(c_hs, s_hs)
+
+    def assert_resume_handshake(self):
+        # for client/server where KEY_SHARE do not match, the hello is retried
+        c_hs, s_hs = self.norm_exp("ServerHello:EncryptedExtensions:Finished",
+                                   "ClientHello:Finished")
+        self._assert_hs(c_hs, s_hs)
+
+    def assert_verify_null_handshake(self):
+        c_hs, s_hs = self.norm_exp(
+            "ServerHello:EncryptedExtensions:CertificateRequest:Certificate:CertificateVerify:Finished",
+            "ClientHello:Certificate:Finished")
+        self._assert_hs(c_hs, s_hs)
+
+    def assert_verify_cert_handshake(self):
+        c_hs, s_hs = self.norm_exp(
+            "ServerHello:EncryptedExtensions:CertificateRequest:Certificate:CertificateVerify:Finished",
+            "ClientHello:Certificate:CertificateVerify:Finished")
+        self._assert_hs(c_hs, s_hs)
+
+
+class ExampleClient:
+
+    def __init__(self, env: Env, crypto_lib: str):
+        self.env = env
+        self._crypto_lib = crypto_lib
+        self._path = env.client_path(self._crypto_lib)
+        self._log_path = f'{self.env.gen_dir}/{self._crypto_lib}-client.log'
+        self._qlog_path = f'{self.env.gen_dir}/{self._crypto_lib}-client.qlog'
+        self._session_path = f'{self.env.gen_dir}/{self._crypto_lib}-client.session'
+        self._tp_path = f'{self.env.gen_dir}/{self._crypto_lib}-client.tp'
+        self._data_path = f'{self.env.gen_dir}/{self._crypto_lib}-client.data'
+
+    @property
+    def path(self):
+        return self._path
+
+    @property
+    def crypto_lib(self):
+        return self._crypto_lib
+
+    @property
+    def uses_cipher_config(self):
+        return CryptoLib.uses_cipher_config(self.crypto_lib)
+
+    def supports_cipher(self, cipher):
+        return CryptoLib.supports_cipher(self.crypto_lib, cipher)
+
+    def exists(self):
+        return os.path.isfile(self.path)
+
+    def clear_session(self):
+        if os.path.isfile(self._session_path):
+            os.remove(self._session_path)
+        if os.path.isfile(self._tp_path):
+            os.remove(self._tp_path)
+
+    def http_get(self, server: ExampleServer, url: str, extra_args: List[str] = None,
+                 use_session=False, data=None,
+                 credentials: Credentials = None,
+                 ciphers: str = None):
+        args = [
+            self.path, '--exit-on-all-streams-close',
+            f'--qlog-file={self._qlog_path}'
+        ]
+        if use_session:
+            args.append(f'--session-file={self._session_path}')
+            args.append(f'--tp-file={self._tp_path}')
+        if data is not None:
+            with open(self._data_path, 'w') as fd:
+                fd.write(data)
+            args.append(f'--data={self._data_path}')
+        if ciphers is not None:
+            ciphers = CryptoLib.adjust_ciphers(self.crypto_lib, ciphers)
+            args.append(f'--ciphers={ciphers}')
+        if credentials is not None:
+            args.append(f'--key={credentials.pkey_file}')
+            args.append(f'--cert={credentials.cert_file}')
+        if extra_args is not None:
+            args.extend(extra_args)
+        args.extend([
+            'localhost', str(self.env.examples_port),
+            url
+        ])
+        if os.path.isfile(self._qlog_path):
+            os.remove(self._qlog_path)
+        with open(self._log_path, 'w') as log_file:
+            logfile = LogFile(path=self._log_path)
+            server.log.advance()
+            process = subprocess.Popen(args=args, text=True,
+                                       stdout=log_file, stderr=log_file)
+            process.wait()
+            return ClientRun(env=self.env, returncode=process.returncode,
+                             logfile=logfile, srun=server.get_run())
+
diff --git a/examples/tests/ngtcp2test/env.py b/examples/tests/ngtcp2test/env.py
new file mode 100644
index 0000000..9699d55
--- /dev/null
+++ b/examples/tests/ngtcp2test/env.py
@@ -0,0 +1,191 @@
+import logging
+import os
+from configparser import ConfigParser, ExtendedInterpolation
+from typing import Dict, Optional
+
+from .certs import CertificateSpec, Ngtcp2TestCA, Credentials
+
+log = logging.getLogger(__name__)
+
+
+class CryptoLib:
+
+    IGNORES_CIPHER_CONFIG = [
+        'picotls', 'boringssl'
+    ]
+    UNSUPPORTED_CIPHERS = {
+        'wolfssl': [
+            'TLS_AES_128_CCM_SHA256',  # no plans to
+        ],
+        'picotls': [
+            'TLS_AES_128_CCM_SHA256',  # no plans to
+        ],
+        'boringssl': [
+            'TLS_AES_128_CCM_SHA256',  # no plans to
+        ]
+    }
+    GNUTLS_CIPHERS = {
+        'TLS_AES_128_GCM_SHA256': 'AES-128-GCM',
+        'TLS_AES_256_GCM_SHA384': 'AES-256-GCM',
+        'TLS_CHACHA20_POLY1305_SHA256': 'CHACHA20-POLY1305',
+        'TLS_AES_128_CCM_SHA256': 'AES-128-CCM',
+    }
+
+    @classmethod
+    def uses_cipher_config(cls, crypto_lib):
+        return crypto_lib not in cls.IGNORES_CIPHER_CONFIG
+
+    @classmethod
+    def supports_cipher(cls, crypto_lib, cipher):
+        return crypto_lib not in cls.UNSUPPORTED_CIPHERS or \
+               cipher not in cls.UNSUPPORTED_CIPHERS[crypto_lib]
+
+    @classmethod
+    def adjust_ciphers(cls, crypto_lib, ciphers: str) -> str:
+        if crypto_lib == 'gnutls':
+            gciphers = "NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL"
+            for cipher in ciphers.split(':'):
+                gciphers += f':+{cls.GNUTLS_CIPHERS[cipher]}'
+            return gciphers
+        return ciphers
+
+
+def init_config_from(conf_path):
+    if os.path.isfile(conf_path):
+        config = ConfigParser(interpolation=ExtendedInterpolation())
+        config.read(conf_path)
+        return config
+    return None
+
+
+TESTS_PATH = os.path.dirname(os.path.dirname(__file__))
+EXAMPLES_PATH = os.path.dirname(TESTS_PATH)
+DEF_CONFIG = init_config_from(os.path.join(TESTS_PATH, 'config.ini'))
+
+
+class Env:
+
+    @classmethod
+    def get_crypto_libs(cls, configurable_ciphers=None):
+        names = [name for name in DEF_CONFIG['examples']
+                 if DEF_CONFIG['examples'][name] == 'yes']
+        if configurable_ciphers is not None:
+            names = [n for n in names if CryptoLib.uses_cipher_config(n)]
+        return names
+
+    def __init__(self, examples_dir=None, tests_dir=None, config=None,
+                 pytestconfig=None):
+        self._verbose = pytestconfig.option.verbose if pytestconfig is not None else 0
+        self._examples_dir = examples_dir if examples_dir is not None else EXAMPLES_PATH
+        self._tests_dir = examples_dir if tests_dir is not None else TESTS_PATH
+        self._gen_dir = os.path.join(self._tests_dir, 'gen')
+        self.config = config if config is not None else DEF_CONFIG
+        self._version = self.config['ngtcp2']['version']
+        self._crypto_libs = [name for name in self.config['examples']
+                             if self.config['examples'][name] == 'yes']
+        self._clients = [self.config['clients'][lib] for lib in self._crypto_libs
+                         if lib in self.config['clients']]
+        self._servers = [self.config['servers'][lib] for lib in self._crypto_libs
+                         if lib in self.config['servers']]
+        self._examples_pem = {
+            'key': 'xxx',
+            'cert': 'xxx',
+        }
+        self._htdocs_dir = os.path.join(self._gen_dir, 'htdocs')
+        self._tld = 'tests.ngtcp2.nghttp2.org'
+        self._example_domain = f"one.{self._tld}"
+        self._ca = None
+        self._cert_specs = [
+            CertificateSpec(domains=[self._example_domain], key_type='rsa2048'),
+            CertificateSpec(name="clientsX", sub_specs=[
+               CertificateSpec(name="user1", client=True),
+            ]),
+        ]
+
+    def issue_certs(self):
+        if self._ca is None:
+            self._ca = Ngtcp2TestCA.create_root(name=self._tld,
+                                               store_dir=os.path.join(self.gen_dir, 'ca'),
+                                               key_type="rsa2048")
+        self._ca.issue_certs(self._cert_specs)
+
+    def setup(self):
+        os.makedirs(self._gen_dir, exist_ok=True)
+        os.makedirs(self._htdocs_dir, exist_ok=True)
+        self.issue_certs()
+
+    def get_server_credentials(self) -> Optional[Credentials]:
+        creds = self.ca.get_credentials_for_name(self._example_domain)
+        if len(creds) > 0:
+            return creds[0]
+        return None
+
+    @property
+    def verbose(self) -> int:
+        return self._verbose
+
+    @property
+    def version(self) -> str:
+        return self._version
+
+    @property
+    def gen_dir(self) -> str:
+        return self._gen_dir
+
+    @property
+    def ca(self):
+        return self._ca
+
+    @property
+    def htdocs_dir(self) -> str:
+        return self._htdocs_dir
+
+    @property
+    def example_domain(self) -> str:
+        return self._example_domain
+
+    @property
+    def examples_dir(self) -> str:
+        return self._examples_dir
+
+    @property
+    def examples_port(self) -> int:
+        return int(self.config['examples']['port'])
+
+    @property
+    def examples_pem(self) -> Dict[str, str]:
+        return self._examples_pem
+
+    @property
+    def crypto_libs(self):
+        return self._crypto_libs
+
+    @property
+    def clients(self):
+        return self._clients
+
+    @property
+    def servers(self):
+        return self._servers
+
+    def client_name(self, crypto_lib):
+        if crypto_lib in self.config['clients']:
+            return self.config['clients'][crypto_lib]
+        return None
+
+    def client_path(self, crypto_lib):
+        cname = self.client_name(crypto_lib)
+        if cname is not None:
+            return os.path.join(self.examples_dir, cname)
+        return None
+
+    def server_name(self, crypto_lib):
+        if crypto_lib in self.config['servers']:
+            return self.config['servers'][crypto_lib]
+        return None
+
+    def server_path(self, crypto_lib):
+        sname = self.server_name(crypto_lib)
+        if sname is not None:
+            return os.path.join(self.examples_dir, sname)
+        return None
diff --git a/examples/tests/ngtcp2test/log.py b/examples/tests/ngtcp2test/log.py
new file mode 100644
index 0000000..9e8f399
--- /dev/null
+++ b/examples/tests/ngtcp2test/log.py
@@ -0,0 +1,101 @@
+import binascii
+import os
+import re
+import sys
+import time
+from datetime import timedelta, datetime
+from io import SEEK_END
+from typing import List
+
+
+class LogFile:
+
+    def __init__(self, path: str):
+        self._path = path
+        self._start_pos = 0
+        self._last_pos = self._start_pos
+
+    @property
+    def path(self) -> str:
+        return self._path
+
+    def reset(self):
+        self._start_pos = 0
+        self._last_pos = self._start_pos
+
+    def advance(self) -> None:
+        if os.path.isfile(self._path):
+            with open(self._path) as fd:
+                self._start_pos = fd.seek(0, SEEK_END)
+
+    def get_recent(self, advance=True) -> List[str]:
+        lines = []
+        if os.path.isfile(self._path):
+            with open(self._path) as fd:
+                fd.seek(self._last_pos, os.SEEK_SET)
+                for line in fd:
+                    lines.append(line)
+                if advance:
+                    self._last_pos = fd.tell()
+        return lines
+
+    def scan_recent(self, pattern: re, timeout=10) -> bool:
+        if not os.path.isfile(self.path):
+            return False
+        with open(self.path) as fd:
+            end = datetime.now() + timedelta(seconds=timeout)
+            while True:
+                fd.seek(self._last_pos, os.SEEK_SET)
+                for line in fd:
+                    if pattern.match(line):
+                        return True
+                if datetime.now() > end:
+                    raise TimeoutError(f"pattern not found in error log after {timeout} seconds")
+                time.sleep(.1)
+        return False
+
+
+class HexDumpScanner:
+
+    def __init__(self, source, leading_regex=None):
+        self._source = source
+        self._leading_regex = leading_regex
+
+    def __iter__(self):
+        data = b''
+        offset = 0 if self._leading_regex is None else -1
+        idx = 0
+        for l in self._source:
+            if offset == -1:
+                pass
+            elif offset == 0:
+                # possible start of a hex dump
+                m = re.match(r'^\s*0+(\s+-)?((\s+[0-9a-f]{2}){1,16})(\s+.*)$',
+                             l, re.IGNORECASE)
+                if m:
+                    data = binascii.unhexlify(re.sub(r'\s+', '', m.group(2)))
+                    offset = 16
+                    idx = 1
+                    continue
+            else:
+                # possible continuation of a hexdump
+                m = re.match(r'^\s*([0-9a-f]+)(\s+-)?((\s+[0-9a-f]{2}){1,16})'
+                             r'(\s+.*)$', l, re.IGNORECASE)
+                if m:
+                    loffset = int(m.group(1), 16)
+                    if loffset == offset or loffset == idx:
+                        data += binascii.unhexlify(re.sub(r'\s+', '',
+                                                          m.group(3)))
+                        offset += 16
+                        idx += 1
+                        continue
+                    else:
+                        sys.stderr.write(f'wrong offset {loffset}, expected {offset} or {idx}\n')
+            # not a hexdump line, produce any collected data
+            if len(data) > 0:
+                yield data
+                data = b''
+            offset = 0 if self._leading_regex is None \
+                or self._leading_regex.match(l) else -1
+        if len(data) > 0:
+            yield data
diff --git a/examples/tests/ngtcp2test/server.py b/examples/tests/ngtcp2test/server.py
new file mode 100644
index 0000000..9f4e9a0
--- /dev/null
+++ b/examples/tests/ngtcp2test/server.py
@@ -0,0 +1,137 @@
+import logging
+import os
+import re
+import subprocess
+import time
+from datetime import datetime, timedelta
+from threading import Thread
+
+from .tls import HandShake
+from .env import Env, CryptoLib
+from .log import LogFile, HexDumpScanner
+
+
+log = logging.getLogger(__name__)
+
+
+class ServerRun:
+
+    def __init__(self, env: Env, logfile: LogFile):
+        self.env = env
+        self._logfile = logfile
+        self.log_lines = self._logfile.get_recent()
+        self._data_recs = None
+        self._hs_recs = None
+        if self.env.verbose > 1:
+            log.debug(f'read {len(self.log_lines)} lines from {logfile.path}')
+
+    @property
+    def handshake(self):
+        if self._data_recs is None:
+            self._data_recs = [data for data in HexDumpScanner(source=self.log_lines)]
+            if self.env.verbose > 1:
+                log.debug(f'detected {len(self._data_recs)} hexdumps '
+                          f'in {self._logfile.path}')
+        if self._hs_recs is None:
+            self._hs_recs = [hrec for hrec in HandShake(source=self._data_recs,
+                                                        verbose=self.env.verbose)]
+            if self.env.verbose > 1:
+                log.debug(f'detected {len(self._hs_recs)} crypto records '
+                          f'in {self._logfile.path}')
+        return self._hs_recs
+
+    @property
+    def hs_stripe(self):
+        return ":".join([hrec.name for hrec in self.handshake])
+
+
+def monitor_proc(env: Env, proc):
+    _env = env
+    proc.wait()
+
+
+class ExampleServer:
+
+    def __init__(self, env: Env, crypto_lib: str, verify_client=False):
+        self.env = env
+        self._crypto_lib = crypto_lib
+        self._path = env.server_path(self._crypto_lib)
+        self._logpath = f'{self.env.gen_dir}/{self._crypto_lib}-server.log'
+        self._log = LogFile(path=self._logpath)
+        self._logfile = None
+        self._process = None
+        self._verify_client = verify_client
+
+    @property
+    def path(self):
+        return self._path
+
+    @property
+    def crypto_lib(self):
+        return self._crypto_lib
+
+    @property
+    def uses_cipher_config(self):
+        return CryptoLib.uses_cipher_config(self.crypto_lib)
+
+    def supports_cipher(self, cipher):
+        return CryptoLib.supports_cipher(self.crypto_lib, cipher)
+
+    @property
+    def log(self):
+        return self._log
+
+    def exists(self):
+        return os.path.isfile(self.path)
+
+    def start(self):
+        if self._process is not None:
+            return False
+        creds = self.env.get_server_credentials()
+        assert creds
+        args = [
+            self.path,
+            f'--htdocs={self.env.htdocs_dir}',
+        ]
+        if self._verify_client:
+            args.append('--verify-client')
+        args.extend([
+            '*', str(self.env.examples_port),
+            creds.pkey_file, creds.cert_file
+        ])
+        self._logfile = open(self._logpath, 'w')
+        self._process = subprocess.Popen(args=args, text=True,
+                                         stdout=self._logfile, stderr=self._logfile)
+        t = Thread(target=monitor_proc, daemon=True, args=(self.env, self._process))
+        t.start()
+        timeout = 5
+        end = datetime.now() + timedelta(seconds=timeout)
+        while True:
+            if self._process.poll():
+                return False
+            try:
+                if self.log.scan_recent(pattern=re.compile(r'^Using document root'), timeout=0.5):
+                    break
+            except TimeoutError:
+                pass
+            if datetime.now() > end:
+                raise TimeoutError(f"pattern not found in error log after {timeout} seconds")
+        self.log.advance()
+        return True
+
+    def stop(self):
+        if self._process:
+            self._process.terminate()
+            self._process = None
+        if self._logfile:
+            self._logfile.close()
+            self._logfile = None
+        return True
+
+    def restart(self):
+        self.stop()
+        self._log.reset()
+        return self.start()
+
+    def get_run(self) -> ServerRun:
+        return ServerRun(env=self.env, logfile=self.log)
diff --git a/examples/tests/ngtcp2test/tls.py b/examples/tests/ngtcp2test/tls.py
new file mode 100644
index 0000000..f9bce62
--- /dev/null
+++ b/examples/tests/ngtcp2test/tls.py
@@ -0,0 +1,983 @@
+import binascii
+import logging
+import sys
+from collections.abc import Iterator
+from typing import Dict, Any, Iterable
+
+
+log = logging.getLogger(__name__)
+
+
+class ParseError(Exception):
+    pass
+
+def _get_int(d, n):
+    if len(d) < n:
+        raise ParseError(f'get_int: {n} bytes needed, but data is {d}')
+    if n == 1:
+        dlen = d[0]
+    else:
+        dlen = int.from_bytes(d[0:n], byteorder='big')
+    return d[n:], dlen
+
+
+def _get_field(d, dlen):
+    if dlen > 0:
+        if len(d) < dlen:
+            raise ParseError(f'field len={dlen}, but data len={len(d)}')
+        field = d[0:dlen]
+        return d[dlen:], field
+    return d, b''
+
+
+def _get_len_field(d, n):
+    d, dlen = _get_int(d, n)
+    return _get_field(d, dlen)
+
+
+# d are bytes that start with a quic variable length integer
+def _get_qint(d):
+    i = d[0] & 0xc0
+    if i == 0:
+        return d[1:], int(d[0])
+    elif i == 0x40:
+        ndata = bytearray(d[0:2])
+        d = d[2:]
+        ndata[0] = ndata[0] & ~0xc0
+        return d, int.from_bytes(ndata, byteorder='big')
+    elif i == 0x80:
+        ndata = bytearray(d[0:4])
+        d = d[4:]
+        ndata[0] = ndata[0] & ~0xc0
+        return d, int.from_bytes(ndata, byteorder='big')
+    else:
+        ndata = bytearray(d[0:8])
+        d = d[8:]
+        ndata[0] = ndata[0] & ~0xc0
+        return d, int.from_bytes(ndata, byteorder='big')
+
+
+class TlsSupportedGroups:
+    NAME_BY_ID = {
+        0: 'Reserved',
+        1: 'sect163k1',
+        2: 'sect163r1',
+        3: 'sect163r2',
+        4: 'sect193r1',
+        5: 'sect193r2',
+        6: 'sect233k1',
+        7: 'sect233r1',
+        8: 'sect239k1',
+        9: 'sect283k1',
+        10: 'sect283r1',
+        11: 'sect409k1',
+        12: 'sect409r1',
+        13: 'sect571k1',
+        14: 'sect571r1',
+        15: 'secp160k1',
+        16: 'secp160r1',
+        17: 'secp160r2',
+        18: 'secp192k1',
+        19: 'secp192r1',
+        20: 'secp224k1',
+        21: 'secp224r1',
+        22: 'secp256k1',
+        23: 'secp256r1',
+        24: 'secp384r1',
+        25: 'secp521r1',
+        26: 'brainpoolP256r1',
+        27: 'brainpoolP384r1',
+        28: 'brainpoolP512r1',
+        29: 'x25519',
+        30: 'x448',
+        31: 'brainpoolP256r1tls13',
+        32: 'brainpoolP384r1tls13',
+        33: 'brainpoolP512r1tls13',
+        34: 'GC256A',
+        35: 'GC256B',
+        36: 'GC256C',
+        37: 'GC256D',
+        38: 'GC512A',
+        39: 'GC512B',
+        40: 'GC512C',
+        41: 'curveSM2',
+    }
+
+    @classmethod
+    def name(cls, gid):
+        if gid in cls.NAME_BY_ID:
+            return f'{cls.NAME_BY_ID[gid]}(0x{gid:0x})'
+        return f'0x{gid:0x}'
+
+
+class TlsSignatureScheme:
+    NAME_BY_ID = {
+        0x0201: 'rsa_pkcs1_sha1',
+        0x0202: 'Reserved',
+        0x0203:	'ecdsa_sha1',
+        0x0401: 'rsa_pkcs1_sha256',
+        0x0403: 'ecdsa_secp256r1_sha256',
+        0x0420:	'rsa_pkcs1_sha256_legacy',
+        0x0501: 'rsa_pkcs1_sha384',
+        0x0503:	'ecdsa_secp384r1_sha384',
+        0x0520: 'rsa_pkcs1_sha384_legacy',
+        0x0601:	'rsa_pkcs1_sha512',
+        0x0603: 'ecdsa_secp521r1_sha512',
+        0x0620:	'rsa_pkcs1_sha512_legacy',
+        0x0704: 'eccsi_sha256',
+        0x0705:	'iso_ibs1',
+        0x0706: 'iso_ibs2',
+        0x0707:	'iso_chinese_ibs',
+        0x0708: 'sm2sig_sm3',
+        0x0709:	'gostr34102012_256a',
+        0x070A: 'gostr34102012_256b',
+        0x070B:	'gostr34102012_256c',
+        0x070C: 'gostr34102012_256d',
+        0x070D:	'gostr34102012_512a',
+        0x070E: 'gostr34102012_512b',
+        0x070F:	'gostr34102012_512c',
+        0x0804: 'rsa_pss_rsae_sha256',
+        0x0805:	'rsa_pss_rsae_sha384',
+        0x0806: 'rsa_pss_rsae_sha512',
+        0x0807:	'ed25519',
+        0x0808: 'ed448',
+        0x0809:	'rsa_pss_pss_sha256',
+        0x080A: 'rsa_pss_pss_sha384',
+        0x080B:	'rsa_pss_pss_sha512',
+        0x081A: 'ecdsa_brainpoolP256r1tls13_sha256',
+        0x081B:	'ecdsa_brainpoolP384r1tls13_sha384',
+        0x081C: 'ecdsa_brainpoolP512r1tls13_sha512',
+    }
+
+    @classmethod
+    def name(cls, gid):
+        if gid in cls.NAME_BY_ID:
+            return f'{cls.NAME_BY_ID[gid]}(0x{gid:0x})'
+        return f'0x{gid:0x}'
+
+
+class TlsCipherSuites:
+    NAME_BY_ID = {
+        0x1301: 'TLS_AES_128_GCM_SHA256',
+        0x1302: 'TLS_AES_256_GCM_SHA384',
+        0x1303: 'TLS_CHACHA20_POLY1305_SHA256',
+        0x1304: 'TLS_AES_128_CCM_SHA256',
+        0x1305: 'TLS_AES_128_CCM_8_SHA256',
+        0x00ff: 'TLS_EMPTY_RENEGOTIATION_INFO_SCSV',
+    }
+
+    @classmethod
+    def name(cls, cid):
+        if cid in cls.NAME_BY_ID:
+            return f'{cls.NAME_BY_ID[cid]}(0x{cid:0x})'
+        return f'Cipher(0x{cid:0x})'
+
+
+class PskKeyExchangeMode:
+    NAME_BY_ID = {
+        0x00: 'psk_ke',
+        0x01: 'psk_dhe_ke',
+    }
+
+    @classmethod
+    def name(cls, gid):
+        if gid in cls.NAME_BY_ID:
+            return f'{cls.NAME_BY_ID[gid]}(0x{gid:0x})'
+        return f'0x{gid:0x}'
+
+
+class QuicTransportParam:
+    NAME_BY_ID = {
+        0x00: 'original_destination_connection_id',
+        0x01: 'max_idle_timeout',
+        0x02: 'stateless_reset_token',
+        0x03: 'max_udp_payload_size',
+        0x04: 'initial_max_data',
+        0x05: 'initial_max_stream_data_bidi_local',
+        0x06: 'initial_max_stream_data_bidi_remote',
+        0x07: 'initial_max_stream_data_uni',
+        0x08: 'initial_max_streams_bidi',
+        0x09: 'initial_max_streams_uni',
+        0x0a: 'ack_delay_exponent',
+        0x0b: 'max_ack_delay',
+        0x0c: 'disable_active_migration',
+        0x0d: 'preferred_address',
+        0x0e: 'active_connection_id_limit',
+        0x0f: 'initial_source_connection_id',
+        0x10: 'retry_source_connection_id',
+    }
+    TYPE_BY_ID = {
+        0x00: bytes,
+        0x01: int,
+        0x02: bytes,
+        0x03: int,
+        0x04: int,
+        0x05: int,
+        0x06: int,
+        0x07: int,
+        0x08: int,
+        0x09: int,
+        0x0a: int,
+        0x0b: int,
+        0x0c: int,
+        0x0d: bytes,
+        0x0e: int,
+        0x0f: bytes,
+        0x10: bytes,
+    }
+
+    @classmethod
+    def name(cls, cid):
+        if cid in cls.NAME_BY_ID:
+            return f'{cls.NAME_BY_ID[cid]}(0x{cid:0x})'
+        return f'QuicTP(0x{cid:0x})'
+
+    @classmethod
+    def is_qint(cls, cid):
+        if cid in cls.TYPE_BY_ID:
+            return cls.TYPE_BY_ID[cid] == int
+        return False
+
+
+class Extension:
+
+    def __init__(self, eid, name, edata, hsid):
+        self._eid = eid
+        self._name = name
+        self._edata = edata
+        self._hsid = hsid
+
+    @property
+    def data(self):
+        return self._edata
+
+    @property
+    def hsid(self):
+        return self._hsid
+
+    def to_json(self):
+        jdata = {
+            'id': self._eid,
+            'name': self._name,
+        }
+        if len(self.data) > 0:
+            jdata['data'] = binascii.hexlify(self.data).decode()
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        s = f'{ind}{self._name}(0x{self._eid:0x})'
+        if len(self._edata):
+            s += f'\n{ind}  data({len(self._edata)}): ' \
+                   f'{binascii.hexlify(self._edata).decode()}'
+        return s
+
+
+class ExtSupportedGroups(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        d = edata
+        self._groups = []
+        while len(d) > 0:
+            d, gid = _get_int(d, 2)
+            self._groups.append(gid)
+
+    def to_json(self):
+        jdata = {
+            'id': self._eid,
+            'name': self._name,
+        }
+        if len(self._groups):
+            jdata['groups'] = [TlsSupportedGroups.name(gid)
+                               for gid in self._groups]
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        gnames = [TlsSupportedGroups.name(gid) for gid in self._groups]
+        s = f'{ind}{self._name}(0x{self._eid:0x}): {", ".join(gnames)}'
+        return s
+
+
+class ExtKeyShare(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        d = self.data
+        self._keys = []
+        self._group = None
+        self._pubkey = None
+        if self.hsid == 2:  # ServerHello
+            # single key share (group, pubkey)
+            d, self._group = _get_int(d, 2)
+            d, self._pubkey = _get_len_field(d, 2)
+        elif self.hsid == 6:  # HelloRetryRequest
+            assert len(d) == 2
+            d, self._group = _get_int(d, 2)
+        else:
+            # list if key shares (group, pubkey)
+            d, shares = _get_len_field(d, 2)
+            while len(shares) > 0:
+                shares, group = _get_int(shares, 2)
+                shares, pubkey = _get_len_field(shares, 2)
+                self._keys.append({
+                    'group': TlsSupportedGroups.name(group),
+                    'pubkey': binascii.hexlify(pubkey).decode()
+                })
+
+    def to_json(self):
+        jdata = super().to_json()
+        if self._group is not None:
+            jdata['group'] = TlsSupportedGroups.name(self._group)
+        if self._pubkey is not None:
+            jdata['pubkey'] = binascii.hexlify(self._pubkey).decode()
+        if len(self._keys) > 0:
+            jdata['keys'] = self._keys
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        s = f'{ind}{self._name}(0x{self._eid:0x})'
+        if self._group is not None:
+            s += f'\n{ind}  group: {TlsSupportedGroups.name(self._group)}'
+        if self._pubkey is not None:
+            s += f'\n{ind}  pubkey: {binascii.hexlify(self._pubkey).decode()}'
+        if len(self._keys) > 0:
+            for idx, key in enumerate(self._keys):
+                s += f'\n{ind}    {idx}: {key["group"]}, {key["pubkey"]}'
+        return s
+
+
+class ExtSNI(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        d = self.data
+        self._indicators = []
+        while len(d) > 0:
+            d, entry = _get_len_field(d, 2)
+            entry, stype = _get_int(entry, 1)
+            entry, sname = _get_len_field(entry, 2)
+            self._indicators.append({
+                'type': stype,
+                'name': sname.decode()
+            })
+
+    def to_json(self):
+        jdata = super().to_json()
+        for i in self._indicators:
+            if i['type'] == 0:
+                jdata['host_name'] = i['name']
+            else:
+                jdata[f'0x{i["type"]}'] = i['name']
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        s = f'{ind}{self._name}(0x{self._eid:0x})'
+        if len(self._indicators) == 1 and self._indicators[0]['type'] == 0:
+            s += f': {self._indicators[0]["name"]}'
+        else:
+            for i in self._indicators:
+                ikey = 'host_name' if i["type"] == 0 else f'type(0x{i["type"]:0x}'
+                s += f'\n{ind}    {ikey}: {i["name"]}'
+        return s
+
+
+class ExtALPN(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        d = self.data
+        d, list_len = _get_int(d, 2)
+        self._protocols = []
+        while len(d) > 0:
+            d, proto = _get_len_field(d, 1)
+            self._protocols.append(proto.decode())
+
+    def to_json(self):
+        jdata = super().to_json()
+        if len(self._protocols) == 1:
+            jdata['alpn'] = self._protocols[0]
+        else:
+            jdata['alpn'] = self._protocols
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return f'{ind}{self._name}(0x{self._eid:0x}): {", ".join(self._protocols)}'
+
+
+class ExtEarlyData(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        self._max_size = None
+        d = self.data
+        if hsid == 4:  # SessionTicket
+            assert len(d) == 4, f'expected 4, len is {len(d)} data={d}'
+            d, self._max_size = _get_int(d, 4)
+        else:
+            assert len(d) == 0
+
+    def to_json(self):
+        jdata = super().to_json()
+        if self._max_size is not None:
+            jdata['max_size'] = self._max_size
+        return jdata
+
+
+class ExtSignatureAlgorithms(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        d = self.data
+        d, list_len = _get_int(d, 2)
+        self._algos = []
+        while len(d) > 0:
+            d, algo = _get_int(d, 2)
+            self._algos.append(TlsSignatureScheme.name(algo))
+
+    def to_json(self):
+        jdata = super().to_json()
+        if len(self._algos) > 0:
+            jdata['algorithms'] = self._algos
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return f'{ind}{self._name}(0x{self._eid:0x}): {", ".join(self._algos)}'
+
+
+class ExtPSKExchangeModes(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        d = self.data
+        d, list_len = _get_int(d, 1)
+        self._modes = []
+        while len(d) > 0:
+            d, mode = _get_int(d, 1)
+            self._modes.append(PskKeyExchangeMode.name(mode))
+
+    def to_json(self):
+        jdata = super().to_json()
+        jdata['modes'] = self._modes
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return f'{ind}{self._name}(0x{self._eid:0x}): {", ".join(self._modes)}'
+
+
+class ExtPreSharedKey(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        self._kid = None
+        self._identities = None
+        self._binders = None
+        d = self.data
+        if hsid == 1:  # client hello
+            d, idata = _get_len_field(d, 2)
+            self._identities = []
+            while len(idata):
+                idata, identity = _get_len_field(idata, 2)
+                idata, obfs_age = _get_int(idata, 4)
+                self._identities.append({
+                    'id': binascii.hexlify(identity).decode(),
+                    'age': obfs_age,
+                })
+            d, binders = _get_len_field(d, 2)
+            self._binders = []
+            while len(binders) > 0:
+                binders, hmac = _get_len_field(binders, 1)
+                self._binders.append(binascii.hexlify(hmac).decode())
+            assert len(d) == 0
+        else:
+            d, self._kid = _get_int(d, 2)
+
+    def to_json(self):
+        jdata = super().to_json()
+        if self.hsid == 1:
+            jdata['identities'] = self._identities
+            jdata['binders'] = self._binders
+        else:
+            jdata['identity'] = self._kid
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        s = f'{ind}{self._name}(0x{self._hsid:0x})'
+        if self.hsid == 1:
+            for idx, i in enumerate(self._identities):
+                s += f'\n{ind}  {idx}: {i["id"]} ({i["age"]})'
+            s += f'\n{ind}  binders: {self._binders}'
+        else:
+            s += f'\n{ind}  identity: {self._kid}'
+        return s
+
+
+class ExtSupportedVersions(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        d = self.data
+        self._versions = []
+        if hsid == 1:  # client hello
+            d, list_len = _get_int(d, 1)
+            while len(d) > 0:
+                d, version = _get_int(d, 2)
+                self._versions.append(f'0x{version:0x}')
+        else:
+            d, version = _get_int(d, 2)
+            self._versions.append(f'0x{version:0x}')
+
+    def to_json(self):
+        jdata = super().to_json()
+        if len(self._versions) == 1:
+            jdata['version'] = self._versions[0]
+        else:
+            jdata['versions'] = self._versions
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return f'{ind}{self._name}(0x{self._eid:0x}): {", ".join(self._versions)}'
+
+
+class ExtQuicTP(Extension):
+
+    def __init__(self, eid, name, edata, hsid):
+        super().__init__(eid=eid, name=name, edata=edata, hsid=hsid)
+        d = self.data
+        self._params = []
+        while len(d) > 0:
+            d, ptype = _get_qint(d)
+            d, plen = _get_qint(d)
+            d, pvalue = _get_field(d, plen)
+            if QuicTransportParam.is_qint(ptype):
+                _, pvalue = _get_qint(pvalue)
+            else:
+                pvalue = binascii.hexlify(pvalue).decode()
+            self._params.append({
+                'key': QuicTransportParam.name(ptype),
+                'value': pvalue,
+            })
+
+    def to_json(self):
+        jdata = super().to_json()
+        jdata['params'] = self._params
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        s = f'{ind}{self._name}(0x{self._eid:0x})'
+        for p in self._params:
+            s += f'\n{ind}  {p["key"]}: {p["value"]}'
+        return s
+
+
+class TlsExtensions:
+
+    EXT_TYPES = [
+        (0x00, 'SNI', ExtSNI),
+        (0x01, 'MAX_FRAGMENT_LENGTH', Extension),
+        (0x03, 'TRUSTED_CA_KEYS', Extension),
+        (0x04, 'TRUNCATED_HMAC', Extension),
+        (0x05, 'OSCP_STATUS_REQUEST', Extension),
+        (0x0a, 'SUPPORTED_GROUPS', ExtSupportedGroups),
+        (0x0b, 'EC_POINT_FORMATS', Extension),
+        (0x0d, 'SIGNATURE_ALGORITHMS', ExtSignatureAlgorithms),
+        (0x0e, 'USE_SRTP', Extension),
+        (0x10, 'ALPN', ExtALPN),
+        (0x11, 'STATUS_REQUEST_V2', Extension),
+        (0x16, 'ENCRYPT_THEN_MAC', Extension),
+        (0x17, 'EXTENDED_MASTER_SECRET', Extension),
+        (0x23, 'SESSION_TICKET', Extension),
+        (0x29, 'PRE_SHARED_KEY', ExtPreSharedKey),
+        (0x2a, 'EARLY_DATA', ExtEarlyData),
+        (0x2b, 'SUPPORTED_VERSIONS', ExtSupportedVersions),
+        (0x2c, 'COOKIE', Extension),
+        (0x2d, 'PSK_KEY_EXCHANGE_MODES', ExtPSKExchangeModes),
+        (0x31, 'POST_HANDSHAKE_AUTH', Extension),
+        (0x32, 'SIGNATURE_ALGORITHMS_CERT', Extension),
+        (0x33, 'KEY_SHARE', ExtKeyShare),
+        (0x39, 'QUIC_TP_PARAMS', ExtQuicTP),
+        (0xff01, 'RENEGOTIATION_INFO', Extension),
+        (0xffa5, 'QUIC_TP_PARAMS_DRAFT', ExtQuicTP),
+    ]
+    NAME_BY_ID = {}
+    CLASS_BY_ID = {}
+
+    @classmethod
+    def init(cls):
+        for (eid, name, ecls) in cls.EXT_TYPES:
+            cls.NAME_BY_ID[eid] = name
+            cls.CLASS_BY_ID[eid] = ecls
+
+    @classmethod
+    def from_data(cls, hsid, data):
+        exts = []
+        d = data
+        while len(d):
+            d, eid = _get_int(d, 2)
+            d, elen = _get_int(d, 2)
+            d, edata = _get_field(d, elen)
+            if eid in cls.NAME_BY_ID:
+                ename = cls.NAME_BY_ID[eid]
+                ecls = cls.CLASS_BY_ID[eid]
+                exts.append(ecls(eid=eid, name=ename, edata=edata, hsid=hsid))
+            else:
+                exts.append(Extension(eid=eid, name=f'(0x{eid:0x})',
+                                      edata=edata, hsid=hsid))
+        return exts
+
+
+TlsExtensions.init()
+
+
+class HSRecord:
+
+    def __init__(self, hsid: int, name: str, data):
+        self._hsid = hsid
+        self._name = name
+        self._data = data
+
+    @property
+    def hsid(self):
+        return self._hsid
+
+    @property
+    def name(self):
+        return self._name
+
+    @name.setter
+    def name(self, value):
+        self._name = value
+
+    @property
+    def data(self):
+        return self._data
+
+    def __repr__(self):
+        return f'{self.name}[{binascii.hexlify(self._data).decode()}]'
+
+    def to_json(self) -> Dict[str, Any]:
+        return {
+            'name': self.name,
+            'data': binascii.hexlify(self._data).decode(),
+        }
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return f'{ind}{self._name}\n'\
+               f'{ind}  id: 0x{self._hsid:0x}\n'\
+               f'{ind}  data({len(self._data)}): '\
+               f'{binascii.hexlify(self._data).decode()}'
+
+
+class ClientHello(HSRecord):
+
+    def __init__(self, hsid: int, name: str, data):
+        super().__init__(hsid=hsid, name=name, data=data)
+        d = data
+        d, self._version = _get_int(d, 2)
+        d, self._random = _get_field(d, 32)
+        d, self._session_id = _get_len_field(d, 1)
+        self._ciphers = []
+        d, ciphers = _get_len_field(d, 2)
+        while len(ciphers):
+            ciphers, cipher = _get_int(ciphers, 2)
+            self._ciphers.append(TlsCipherSuites.name(cipher))
+        d, comps = _get_len_field(d, 1)
+        self._compressions = [int(c) for c in comps]
+        d, edata = _get_len_field(d, 2)
+        self._extensions = TlsExtensions.from_data(hsid, edata)
+
+    def to_json(self):
+        jdata = super().to_json()
+        jdata['version'] = f'0x{self._version:0x}'
+        jdata['random'] = f'{binascii.hexlify(self._random).decode()}'
+        jdata['session_id'] = binascii.hexlify(self._session_id).decode()
+        jdata['ciphers'] = self._ciphers
+        jdata['compressions'] = self._compressions
+        jdata['extensions'] = [ext.to_json() for ext in self._extensions]
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return super().to_text(indent=indent) + '\n'\
+            f'{ind}  version: 0x{self._version:0x}\n'\
+            f'{ind}  random: {binascii.hexlify(self._random).decode()}\n' \
+            f'{ind}  session_id: {binascii.hexlify(self._session_id).decode()}\n' \
+            f'{ind}  ciphers: {", ".join(self._ciphers)}\n'\
+            f'{ind}  compressions: {self._compressions}\n'\
+            f'{ind}  extensions: \n' + '\n'.join(
+                [ext.to_text(indent=indent+4) for ext in self._extensions])
+
+
+class ServerHello(HSRecord):
+
+    HELLO_RETRY_RANDOM = binascii.unhexlify(
+        'CF21AD74E59A6111BE1D8C021E65B891C2A211167ABB8C5E079E09E2C8A8339C'
+    )
+
+    def __init__(self, hsid: int, name: str, data):
+        super().__init__(hsid=hsid, name=name, data=data)
+        d = data
+        d, self._version = _get_int(d, 2)
+        d, self._random = _get_field(d, 32)
+        if self._random == self.HELLO_RETRY_RANDOM:
+            self.name = 'HelloRetryRequest'
+            hsid = 6
+        d, self._session_id = _get_len_field(d, 1)
+        d, cipher = _get_int(d, 2)
+        self._cipher = TlsCipherSuites.name(cipher)
+        d, self._compression = _get_int(d, 1)
+        d, edata = _get_len_field(d, 2)
+        self._extensions = TlsExtensions.from_data(hsid, edata)
+
+    def to_json(self):
+        jdata = super().to_json()
+        jdata['version'] = f'0x{self._version:0x}'
+        jdata['random'] = f'{binascii.hexlify(self._random).decode()}'
+        jdata['session_id'] = binascii.hexlify(self._session_id).decode()
+        jdata['cipher'] = self._cipher
+        jdata['compression'] = int(self._compression)
+        jdata['extensions'] = [ext.to_json() for ext in self._extensions]
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return super().to_text(indent=indent) + '\n'\
+            f'{ind}  version: 0x{self._version:0x}\n'\
+            f'{ind}  random: {binascii.hexlify(self._random).decode()}\n' \
+            f'{ind}  session_id: {binascii.hexlify(self._session_id).decode()}\n' \
+            f'{ind}  cipher: {self._cipher}\n'\
+            f'{ind}  compression: {int(self._compression)}\n'\
+            f'{ind}  extensions: \n' + '\n'.join(
+                [ext.to_text(indent=indent+4) for ext in self._extensions])
+
+
+class EncryptedExtensions(HSRecord):
+
+    def __init__(self, hsid: int, name: str, data):
+        super().__init__(hsid=hsid, name=name, data=data)
+        d = data
+        d, edata = _get_len_field(d, 2)
+        self._extensions = TlsExtensions.from_data(hsid, edata)
+
+    def to_json(self):
+        jdata = super().to_json()
+        jdata['extensions'] = [ext.to_json() for ext in self._extensions]
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return super().to_text(indent=indent) + '\n'\
+            f'{ind}  extensions: \n' + '\n'.join(
+                [ext.to_text(indent=indent+4) for ext in self._extensions])
+
+
+class CertificateRequest(HSRecord):
+
+    def __init__(self, hsid: int, name: str, data):
+        super().__init__(hsid=hsid, name=name, data=data)
+        d = data
+        d, self._context = _get_int(d, 1)
+        d, edata = _get_len_field(d, 2)
+        self._extensions = TlsExtensions.from_data(hsid, edata)
+
+    def to_json(self):
+        jdata = super().to_json()
+        jdata['context'] = self._context
+        jdata['extensions'] = [ext.to_json() for ext in self._extensions]
+        return jdata
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return super().to_text(indent=indent) + '\n'\
+            f'{ind}  context: {self._context}\n'\
+            f'{ind}  extensions: \n' + '\n'.join(
+                [ext.to_text(indent=indent+4) for ext in self._extensions])
+
+
+class Certificate(HSRecord):
+
+    def __init__(self, hsid: int, name: str, data):
+        super().__init__(hsid=hsid, name=name, data=data)
+        d = data
+        d, self._context = _get_int(d, 1)
+        d, clist = _get_len_field(d, 3)
+        self._cert_entries = []
+        while len(clist) > 0:
+            clist, cert_data = _get_len_field(clist, 3)
+            clist, cert_exts = _get_len_field(clist, 2)
+            exts = TlsExtensions.from_data(hsid, cert_exts)
+            self._cert_entries.append({
+                'cert': binascii.hexlify(cert_data).decode(),
+                'extensions': exts,
+            })
+
+    def to_json(self):
+        jdata = super().to_json()
+        jdata['context'] = self._context
+        jdata['certificate_list'] = [{
+            'cert': e['cert'],
+            'extensions': [x.to_json() for x in e['extensions']],
+        } for e in self._cert_entries]
+        return jdata
+
+    def _enxtry_text(self, e, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return f'{ind} cert: {e["cert"]}\n'\
+               f'{ind}  extensions: \n' + '\n'.join(
+            [x.to_text(indent=indent + 4) for x in e['extensions']])
+
+    def to_text(self, indent: int = 0):
+        ind = ' ' * (indent + 2)
+        return super().to_text(indent=indent) + '\n'\
+            f'{ind}  context: {self._context}\n'\
+            f'{ind}  certificate_list: \n' + '\n'.join(
+                [self._enxtry_text(e, indent+4) for e in self._cert_entries])
+
+
+class SessionTicket(HSRecord):
+
+    def __init__(self, hsid: int, name: str, data):
+        super().__init__(hsid=hsid, name=name, data=data)
+        d = data
+        d, self._lifetime = _get_int(d, 4)
+        d, self._age = _get_int(d, 4)
+        d, self._nonce = _get_len_field(d, 1)
+        d, self._ticket = _get_len_field(d, 2)
+        d, edata = _get_len_field(d, 2)
+        self._extensions = TlsExtensions.from_data(hsid, edata)
+
+    def to_json(self):
+        jdata = super().to_json()
+        jdata['lifetime'] = self._lifetime
+        jdata['age'] = self._age
+        jdata['nonce'] = binascii.hexlify(self._nonce).decode()
+        jdata['ticket'] = binascii.hexlify(self._ticket).decode()
+        jdata['extensions'] = [ext.to_json() for ext in self._extensions]
+        return jdata
+
+
+class HSIterator(Iterator):
+
+    def __init__(self, recs):
+        self._recs = recs
+        self._index = 0
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        try:
+            result = self._recs[self._index]
+        except IndexError:
+            raise StopIteration
+        self._index += 1
+        return result
+
+
+class HandShake:
+    REC_TYPES = [
+        (1, 'ClientHello', ClientHello),
+        (2, 'ServerHello', ServerHello),
+        (3, 'HelloVerifyRequest', HSRecord),
+        (4, 'SessionTicket', SessionTicket),
+        (5, 'EndOfEarlyData', HSRecord),
+        (6, 'HelloRetryRequest', ServerHello),
+        (8, 'EncryptedExtensions', EncryptedExtensions),
+        (11, 'Certificate', Certificate),
+        (12, 'ServerKeyExchange ', HSRecord),
+        (13, 'CertificateRequest', CertificateRequest),
+        (14, 'ServerHelloDone', HSRecord),
+        (15, 'CertificateVerify', HSRecord),
+        (16, 'ClientKeyExchange', HSRecord),
+        (20, 'Finished', HSRecord),
+        (22, 'CertificateStatus', HSRecord),
+        (24, 'KeyUpdate', HSRecord),
+    ]
+    RT_NAME_BY_ID = {}
+    RT_CLS_BY_ID = {}
+
+    @classmethod
+    def _parse_rec(cls, data):
+        d, hsid = _get_int(data, 1)
+        if hsid not in cls.RT_CLS_BY_ID:
+            raise ParseError(f'unknown type {hsid}')
+        d, rec_len = _get_int(d, 3)
+        if rec_len > len(d):
+            # incomplete, need more data
+            return data, None
+        d, rec_data = _get_field(d, rec_len)
+        if hsid in cls.RT_CLS_BY_ID:
+            name = cls.RT_NAME_BY_ID[hsid]
+            rcls = cls.RT_CLS_BY_ID[hsid]
+        else:
+            name = f'CryptoRecord(0x{hsid:0x})'
+            rcls = HSRecord
+        return d, rcls(hsid=hsid, name=name, data=rec_data)
+
+    @classmethod
+    def _parse(cls, source, strict=False, verbose: int = 0):
+        d = b''
+        hsid = 0
+        hsrecs = []
+        if verbose > 0:
+            log.debug(f'scanning for handshake records')
+        blocks = [d for d in source]
+        while len(blocks) > 0:
+            try:
+                total_data = b''.join(blocks)
+                remain, r = cls._parse_rec(total_data)
+                if r is None:
+                    # if we could not recognize a record, skip the first
+                    # data block and try again
+                    blocks = blocks[1:]
+                    continue
+                hsrecs.append(r)
+                cons_len = len(total_data) - len(remain)
+                while cons_len > 0 and len(blocks) > 0:
+                    if cons_len >= len(blocks[0]):
+                        cons_len -= len(blocks[0])
+                        blocks = blocks[1:]
+                    else:
+                        blocks[0] = blocks[0][cons_len:]
+                        cons_len = 0
+                if verbose > 2:
+                    log.debug(f'added record: {r.to_text()}')
+            except ParseError as err:
+                # if we could not recognize a record, skip the first
+                # data block and try again
+                blocks = blocks[1:]
+        if len(blocks) > 0 and strict:
+            raise Exception(f'possibly incomplete handshake record '
+                            f'id={hsid}, from raw={blocks}\n')
+        return hsrecs
+
+
+
+    @classmethod
+    def init(cls):
+        for (hsid, name, rcls) in cls.REC_TYPES:
+            cls.RT_NAME_BY_ID[hsid] = name
+            cls.RT_CLS_BY_ID[hsid] = rcls
+
+    def __init__(self, source: Iterable[bytes], strict: bool = False,
+                 verbose: int = 0):
+        self._source = source
+        self._strict = strict
+        self._verbose = verbose
+
+    def __iter__(self):
+        return HSIterator(recs=self._parse(self._source, strict=self._strict,
+                                           verbose=self._verbose))
+
+
+HandShake.init()