def test_ecdh_direct_hkdf_apply_with_ecdh_ss_p256(self):
rec = Recipient.from_jwk({
"kty":
"EC",
"alg":
"ECDH-SS+HKDF-256",
"d":
"kwibx3gas6Kz1V2fyQHKSnr-ybflddSjN0eOnbmLmyo",
"crv":
"P-256",
"kid":
"01",
"x":
"-eZXC6nV-xgthy8zZMCN8pcYSeE2XfWWqckA2fsxHPc",
"y":
"BGU5soLgsu_y7GN2I3EPUXS9EZ7Sw0qif-V70JtInFI",
})
with open(key_path("public_key_es256.pem")) as key_file:
pub_key = COSEKey.from_pem(key_file.read(), kid="01")
enc_key = rec.apply(recipient_key=pub_key,
salt=token_bytes(32),
context={"alg": "A128GCM"})
ctx = COSE.new(alg_auto_inclusion=True)
encoded = ctx.encode_and_encrypt(b"Hello world!",
enc_key,
recipients=[rec])
with open(key_path("private_key_es256.pem")) as key_file:
priv_key = COSEKey.from_pem(key_file.read(),
kid="01",
alg="ECDH-SS+HKDF-256")
assert b"Hello world!" == ctx.decode(encoded,
priv_key,
context={"alg": "A128GCM"})
def test_ecdh_direct_hkdf_apply_with_party_u_nonce(self):
nonce = token_bytes(32)
rec = Recipient.from_jwk({
"kty": "EC",
"crv": "P-256",
"alg": "ECDH-ES+HKDF-256"
})
with open(key_path("public_key_es256.pem")) as key_file:
pub_key = COSEKey.from_pem(key_file.read(), kid="01")
context = [
1,
[None, nonce, None],
[None, None, None],
[128, cbor2.dumps({1: -25})],
]
enc_key = rec.apply(recipient_key=pub_key, context=context)
assert nonce == rec._unprotected[-22]
ctx = COSE.new(alg_auto_inclusion=True)
encoded = ctx.encode_and_encrypt(b"Hello world!",
enc_key,
recipients=[rec])
with open(key_path("private_key_es256.pem")) as key_file:
priv_key = COSEKey.from_pem(key_file.read(),
kid="01",
alg="ECDH-ES+HKDF-256")
assert b"Hello world!" == ctx.decode(encoded,
priv_key,
context=context)
def test_ecdh_direct_hkdf_apply_without_salt(self):
rec = Recipient.from_jwk({
"kty": "EC",
"crv": "P-256",
"alg": "ECDH-ES+HKDF-256"
})
with open(key_path("public_key_es256.pem")) as key_file:
pub_key = COSEKey.from_pem(key_file.read(), kid="01")
enc_key = rec.apply(
recipient_key=pub_key,
context=[
1,
[None, None, None],
[None, None, None],
[128, cbor2.dumps({1: -25})],
],
)
ctx = COSE.new(alg_auto_inclusion=True)
encoded = ctx.encode_and_encrypt(b"Hello world!",
enc_key,
recipients=[rec])
with open(key_path("private_key_es256.pem")) as key_file:
priv_key = COSEKey.from_pem(key_file.read(),
kid="01",
alg="ECDH-ES+HKDF-256")
assert b"Hello world!" == ctx.decode(encoded,
priv_key,
context={"alg": "A128GCM"})
def test_ecdh_direct_hkdf_apply_with_ecdh_ss_p521_with_default_salt(self):
rec = Recipient.from_jwk({
"kty": "EC",
"alg": "ECDH-SS+HKDF-512",
"d":
"ADYyo73ZKicOjwGDYQ_ybZKnVzdAcxGm9OVAxQjzgVM4jaS-Iwtkz90oLdDz3shgKlDgtRK2Aa9lMhqR94hBo4IE",
"crv": "P-521",
"kid": "01",
"x":
"APkZitSJMJUMB-iPCt47sWu_CrnUHg6IAR4qjmHON-2u41Rjg6DNOS0LZYJJt-AVH5NgGVi8ElIfjo71b9HXCTOc",
"y":
"ASx-Cb--149HJ-e1KlSaY-1BOhwOdcTkxSt8BGbW7_hnGfzHsoXM3ywwNcp1Yad-FHUKwmCyMelMQEn2Rh4V2l3I",
"salt": "aabbccddeeff",
})
with open(key_path("public_key_es512.pem")) as key_file:
pub_key = COSEKey.from_pem(key_file.read(), kid="01")
enc_key = rec.apply(recipient_key=pub_key, context={"alg": "A128GCM"})
ctx = COSE.new(alg_auto_inclusion=True)
encoded = ctx.encode_and_encrypt(b"Hello world!",
enc_key,
recipients=[rec])
with open(key_path("private_key_es512.pem")) as key_file:
priv_key = COSEKey.from_pem(key_file.read(),
kid="01",
alg="ECDH-SS+HKDF-512")
assert b"Hello world!" == ctx.decode(encoded,
priv_key,
context={"alg": "A128GCM"})
def test_okp_key_derive_key_without_public_key(self):
with open(key_path("private_key_x25519.pem")) as key_file:
private_key = COSEKey.from_pem(key_file.read(),
alg="ECDH-SS+HKDF-256")
with pytest.raises(ValueError) as err:
private_key.derive_key({"alg": "A128GCM"})
assert "public_key should be set." in str(err.value)
def test_okp_key_derive_key_with_raw_context(self):
with open(key_path("private_key_x25519.pem")) as key_file:
private_key = COSEKey.from_pem(key_file.read(),
alg="ECDH-SS+HKDF-256")
pub_key = COSEKey.from_jwk({
"kty":
"OKP",
"alg":
"ECDH-ES+HKDF-256",
"kid":
"01",
"crv":
"X25519",
"x":
"y3wJq3uXPHeoCO4FubvTc7VcBuqpvUrSvU6ZMbHDTCI",
# "d": "vsJ1oX5NNi0IGdwGldiac75r-Utmq3Jq4LGv48Q_Qc4",
})
context = [
1,
[None, None, None],
[None, None, None],
[128, cbor2.dumps({1: -25})],
]
try:
private_key.derive_key(context, public_key=pub_key)
except Exception:
pytest.fail("derive_key() should not fail.")
def test_ecdh_direct_hkdf_through_cose_api_with_ecdh_es(
self, alg, crv, private_key_path, public_key_path):
sender_key = COSEKey.new({1: 2, -1: crv, 3: alg})
rec = Recipient.new(protected={1: alg}, sender_key=sender_key)
with open(key_path(public_key_path)) as key_file:
pub_key = COSEKey.from_pem(key_file.read(), kid="01")
enc_key = rec.apply(recipient_key=pub_key, context={"alg": "A128GCM"})
ctx = COSE.new(alg_auto_inclusion=True)
encoded = ctx.encode_and_encrypt(b"Hello world!",
enc_key,
recipients=[rec])
with open(key_path(private_key_path)) as key_file:
priv_key = COSEKey.from_pem(key_file.read(), kid="01", alg=alg)
assert b"Hello world!" == ctx.decode(encoded,
priv_key,
context={"alg": "A128GCM"})
def test_ec2_key_derive_key_with_invalid_private_key(self):
private_key = EC2Key({
1: 2,
-2:
b"\xa7\xddc*\xff\xc2?\x8b\xf8\x9c:\xad\xccDF\x9cZ \x04P\xef\x99\x0c=\xe6 w1\x08&\xba\xd9",
-3:
b"\xe2\xdb\xef\xfe\xb8\x8a\x12\xf27\xcb\x15:\x8a\xb9\x1a90B\x1a\x19^\xbc\xdc\xde\r\xb9s\xc1P\xf3\xaa\xdd",
-4:
b'\xe9\x16\x0c\xa96\x8d\xfa\xbc\xd5\xda"ua\xec\xf7\x96\r\x15\xf7_\xf3rb{\xb1\xde;\x99\x88\xafNh',
-1: 1,
3: -7, # signature algorithm.
})
with open(key_path("public_key_es256.pem")) as key_file:
public_key = COSEKey.from_pem(key_file.read())
with pytest.raises(ValueError) as err:
private_key.derive_key({"alg": "A128GCM"}, public_key=public_key)
assert "Invalid alg for key derivation: -7." in str(err.value)
def test_okp_key_derive_key_with_ed25519_key(self):
with open(key_path("private_key_x25519.pem")) as key_file:
private_key = COSEKey.from_pem(key_file.read(),
alg="ECDH-SS+HKDF-256")
pub_key = COSEKey.from_jwk({
"kty":
"EC",
"kid":
"01",
"crv":
"P-256",
"x":
"usWxHK2PmfnHKwXPS54m0kTcGJ90UiglWiGahtagnv8",
"y":
"IBOL-C3BttVivg-lSreASjpkttcsz-1rb7btKLv8EX4",
# "d": "V8kgd2ZBRuh2dgyVINBUqpPDr7BOMGcF22CQMIUHtNM",
})
with pytest.raises(ValueError) as err:
private_key.derive_key({"alg": "A128GCM"}, public_key=pub_key)
assert "public_key should be x25519/x448 public key." in str(err.value)
def test_ecdh_direct_hkdf_apply_with_supp_pub_other(self):
nonce = token_bytes(32)
rec = Recipient.from_jwk({
"kty": "EC",
"crv": "P-256",
"alg": "ECDH-ES+HKDF-256"
})
with open(key_path("public_key_es256.pem")) as key_file:
pub_key = COSEKey.from_pem(key_file.read(), kid="01")
enc_key = rec.apply(
recipient_key=pub_key,
context=[
1,
[None, None, None],
[None, nonce, None],
[128, cbor2.dumps({1: -25}), b"other"],
],
)
assert enc_key.alg == 1
assert nonce == rec._unprotected[-25]
def test_okp_key_derive_key_with_public_key(self):
with open(key_path("public_key_x25519.pem")) as key_file:
public_key = COSEKey.from_pem(key_file.read(),
alg="ECDH-SS+HKDF-256")
pub_key = COSEKey.from_jwk({
"kty":
"OKP",
"alg":
"ECDH-ES+HKDF-256",
"kid":
"01",
"crv":
"X25519",
"x":
"y3wJq3uXPHeoCO4FubvTc7VcBuqpvUrSvU6ZMbHDTCI",
# "d": "vsJ1oX5NNi0IGdwGldiac75r-Utmq3Jq4LGv48Q_Qc4",
})
with pytest.raises(ValueError) as err:
public_key.derive_key({"alg": "A128GCM"}, public_key=pub_key)
assert "Public key cannot be used for key derivation." in str(
err.value)
def test_okp_key_to_cose_key_with_invalid_key(self):
with open(key_path("private_key_es256.pem")) as key_file:
private_key = COSEKey.from_pem(key_file.read())
with pytest.raises(ValueError) as err:
OKPKey.to_cose_key(private_key.key)
assert "Unsupported or unknown key for OKP." in str(err.value)