def test_sign_ed25519ph_rfc8032():
# sk, pk, msg, exp_sig
# taken from RFC 8032 section 7.3. Test Vectors for Ed25519ph
sk = unhexlify(b"833fe62409237b9d62ec77587520911e"
b"9a759cec1d19755b7da901b96dca3d42")
pk = unhexlify(b"ec172b93ad5e563bf4932c70e1245034"
b"c35467ef2efd4d64ebf819683467e2bf")
msg = b"abc"
exp_sig = unhexlify(b"98a70222f0b8121aa9d30f813d683f80"
b"9e462b469c7ff87639499bb94e6dae41"
b"31f85042463c2a355a2003d062adf5aa"
b"a10b8c61e636062aaad11c2a26083406")
c_sk = sk + pk
edph = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph, msg)
sig = c.crypto_sign_ed25519ph_final_create(edph, c_sk)
assert sig == exp_sig
edph_v = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph_v, msg)
assert c.crypto_sign_ed25519ph_final_verify(edph_v, exp_sig, pk) is True
c.crypto_sign_ed25519ph_update(edph_v, msg)
with pytest.raises(BadSignatureError):
c.crypto_sign_ed25519ph_final_verify(edph_v, exp_sig, pk)
def test_sign_ed25519ph_rfc8032():
# sk, pk, msg, exp_sig
# taken from RFC 8032 section 7.3. Test Vectors for Ed25519ph
sk = unhexlify(b'833fe62409237b9d62ec77587520911e'
b'9a759cec1d19755b7da901b96dca3d42')
pk = unhexlify(b'ec172b93ad5e563bf4932c70e1245034'
b'c35467ef2efd4d64ebf819683467e2bf')
msg = b'abc'
exp_sig = unhexlify(b'98a70222f0b8121aa9d30f813d683f80'
b'9e462b469c7ff87639499bb94e6dae41'
b'31f85042463c2a355a2003d062adf5aa'
b'a10b8c61e636062aaad11c2a26083406')
c_sk = sk + pk
edph = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph, msg)
sig = c.crypto_sign_ed25519ph_final_create(edph, c_sk)
assert sig == exp_sig
edph_v = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph_v, msg)
assert c.crypto_sign_ed25519ph_final_verify(edph_v, exp_sig, pk) is True
c.crypto_sign_ed25519ph_update(edph_v, msg)
with pytest.raises(BadSignatureError):
c.crypto_sign_ed25519ph_final_verify(edph_v, exp_sig, pk)
def verify_certificate(self, cert: Certificate, usage: CertificateUsage) -> None:
"""Verify a certificate against a trust store."""
# Check the validity window and usage
now = datetime.datetime.now().timestamp()
if now < cert.valid_from or now >= cert.valid_from + cert.valid_length:
raise Exception("current timestamp is outside certificate validity window")
if usage not in cert.usages:
raise Exception("not a server certificate")
# Find the issuer cert
if not cert.HasField("issuer"):
raise Exception("no issuer")
ca_cert = self.trusted_certs.get(cert.issuer.value)
if ca_cert is None:
raise Exception("unknown issuer")
# Check the issuer's validity window and usage
if now < ca_cert.valid_from or now >= ca_cert.valid_from + ca_cert.valid_length:
raise Exception("current timestamp is outside CA certificate validity window")
if CertificateUsage.CERTIFICATE_SIGNING not in ca_cert.usages:
raise Exception("not a CA certificate")
# Verify the issuer signature
state = crypto_sign_ed25519ph_state()
self._certificate_signature_state(state, cert, False)
crypto_sign_ed25519ph_final_verify(state, cert.issuer_signature, ca_cert.signing_public_key)
def verify_server_certificate_status(self,
cert: Certificate,
status: CertificateStatusResponse,
status_subject: str) -> None:
"""Verify a server certificate status against a trust store."""
logging.debug("verifying server certificate status")
# Check that the status hash matches
if status.certificate.algorithm == HashAlgorithm.SHA256:
cert_hash = hash_certificate_sha256(cert)
elif status.certificate.algorithm == HashAlgorithm.SHA512:
cert_hash = hash_certificate_sha512(cert)
else:
raise Exception(f"unsupported hash algorithm {status.certificate.algorithm}")
if cert_hash.value != status.certificate.value:
raise Exception("certificate and status response mismatch")
# Check the validity window
now = datetime.datetime.now().timestamp()
if now < status.valid_from or now >= status.valid_from + status.valid_length:
raise Exception("current timestamp is outside status validity window")
# Check the status certificate
self.verify_status_certificate(status.status_certificate, status_subject)
# Verify the status signature
state = crypto_sign_ed25519ph_state()
self._status_signature_state(state, status)
crypto_sign_ed25519ph_final_verify(state, status.status_signature, status.status_certificate.signing_public_key)
# Finally, check the actual status
if status.status != CertificateStatus.VALID:
raise Exception(f"certificate is not valid (status={status.status}")
def test_sign_ed25519ph_libsodium():
#
_hsk, _hpk, hmsg, _hsig, _hsigmsg = ed25519_known_answers()[-1]
msg = unhexlify(hmsg)
seed = unhexlify(b"421151a459faeade3d247115f94aedae"
b"42318124095afabe4d1451a559faedee")
pk, sk = c.crypto_sign_seed_keypair(seed)
exp_sig = unhexlify(b"10c5411e40bd10170fb890d4dfdb6d33"
b"8c8cb11d2764a216ee54df10977dcdef"
b"d8ff755b1eeb3f16fce80e40e7aafc99"
b"083dbff43d5031baf04157b48423960d")
edph = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph, msg)
sig = c.crypto_sign_ed25519ph_final_create(edph, sk)
assert sig == exp_sig
edph_incr = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph_incr, b"")
c.crypto_sign_ed25519ph_update(edph_incr, msg[0:len(msg) // 2])
c.crypto_sign_ed25519ph_update(edph_incr, msg[len(msg) // 2:])
assert c.crypto_sign_ed25519ph_final_verify(edph_incr, exp_sig, pk) is True
with pytest.raises(BadSignatureError):
wrng_sig = flip_byte(exp_sig, 0)
c.crypto_sign_ed25519ph_final_verify(edph_incr, wrng_sig, pk)
with pytest.raises(BadSignatureError):
wrng_mesg = flip_byte(msg, 1022)
edph_wrng = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph_wrng, wrng_mesg)
c.crypto_sign_ed25519ph_final_verify(edph_wrng, exp_sig, pk)
def test_sign_ed25519ph_libsodium():
#
_hsk, _hpk, hmsg, _hsig, _hsigmsg = ed25519_known_answers()[-1]
msg = unhexlify(hmsg)
seed = unhexlify(b'421151a459faeade3d247115f94aedae'
b'42318124095afabe4d1451a559faedee')
pk, sk = c.crypto_sign_seed_keypair(seed)
exp_sig = unhexlify(b'10c5411e40bd10170fb890d4dfdb6d33'
b'8c8cb11d2764a216ee54df10977dcdef'
b'd8ff755b1eeb3f16fce80e40e7aafc99'
b'083dbff43d5031baf04157b48423960d')
edph = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph, msg)
sig = c.crypto_sign_ed25519ph_final_create(edph, sk)
assert sig == exp_sig
edph_incr = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph_incr, b'')
c.crypto_sign_ed25519ph_update(edph_incr, msg[0:len(msg) // 2])
c.crypto_sign_ed25519ph_update(edph_incr, msg[len(msg) // 2:])
assert c.crypto_sign_ed25519ph_final_verify(edph_incr, exp_sig, pk) is True
with pytest.raises(BadSignatureError):
wrng_sig = flip_byte(exp_sig, 0)
c.crypto_sign_ed25519ph_final_verify(edph_incr, wrng_sig, pk)
with pytest.raises(BadSignatureError):
wrng_mesg = flip_byte(msg, 1022)
edph_wrng = c.crypto_sign_ed25519ph_state()
c.crypto_sign_ed25519ph_update(edph_wrng, wrng_mesg)
c.crypto_sign_ed25519ph_final_verify(edph_wrng, exp_sig, pk)