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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
import base64
import binascii
import os
import pytest
from cryptography.exceptions import AlreadyFinalized, InvalidKey
from cryptography.hazmat.primitives.kdf.argon2 import Argon2id
from tests.utils import (
load_nist_vectors,
load_vectors_from_file,
raises_unsupported_algorithm,
)
vectors = load_vectors_from_file(
os.path.join("KDF", "argon2id.txt"), load_nist_vectors
)
@pytest.mark.supported(
only_if=lambda backend: not backend.argon2_supported(),
skip_message="Supports argon2 so can't test unsupported path",
)
def test_unsupported_backend(backend):
with raises_unsupported_algorithm(None):
Argon2id(
salt=b"salt" * 2, length=32, iterations=1, lanes=1, memory_cost=32
)
@pytest.mark.supported(
only_if=lambda backend: backend.argon2_supported(),
skip_message="Argon2id not supported by this version of OpenSSL",
)
class TestArgon2id:
@pytest.mark.parametrize("params", vectors)
def test_derive(self, params, backend):
salt = binascii.unhexlify(params["salt"])
ad = binascii.unhexlify(params["ad"]) if "ad" in params else None
secret = (
binascii.unhexlify(params["secret"])
if "secret" in params
else None
)
length = int(params["length"])
iterations = int(params["iter"])
lanes = int(params["lanes"])
memory_cost = int(params["memcost"])
password = binascii.unhexlify(params["pass"])
derived_key = params["output"].lower()
argon2id = Argon2id(
salt=salt,
length=length,
iterations=iterations,
lanes=lanes,
memory_cost=memory_cost,
ad=ad,
secret=secret,
)
assert binascii.hexlify(argon2id.derive(password)) == derived_key
def test_invalid_types(self, backend):
with pytest.raises(TypeError):
Argon2id(
salt="notbytes", # type: ignore[arg-type]
length=32,
iterations=1,
lanes=1,
memory_cost=32,
ad=None,
secret=None,
)
with pytest.raises(TypeError):
Argon2id(
salt=b"b" * 8,
length=32,
iterations=1,
lanes=1,
memory_cost=32,
ad="string", # type: ignore[arg-type]
secret=None,
)
with pytest.raises(TypeError):
Argon2id(
salt=b"b" * 8,
length=32,
iterations=1,
lanes=1,
memory_cost=32,
ad=None,
secret="string", # type: ignore[arg-type]
)
@pytest.mark.parametrize(
"params",
[
(b"b" * 7, 3, 1, 1, 32), # salt < 8
(b"b" * 8, 3, 1, 1, 32), # length < 4
(b"b" * 8, 32, 0, 1, 32), # iterations < 1
(b"b" * 8, 32, 1, 0, 32), # lanes < 1
(b"b" * 8, 32, 1, 1, 7), # memory_cost < 8 * lanes
(b"b" * 8, 32, 1, 32, 200), # memory_cost < 8 * lanes
],
)
def test_invalid_values(self, params, backend):
(salt, length, iterations, lanes, memory_cost) = params
with pytest.raises(ValueError):
Argon2id(
salt=salt,
length=length,
iterations=iterations,
lanes=lanes,
memory_cost=memory_cost,
)
def test_already_finalized(self, backend):
argon2id = Argon2id(
salt=b"salt" * 2, length=32, iterations=1, lanes=1, memory_cost=32
)
argon2id.derive(b"password")
with pytest.raises(AlreadyFinalized):
argon2id.derive(b"password")
def test_already_finalized_verify(self, backend):
argon2id = Argon2id(
salt=b"salt" * 2, length=32, iterations=1, lanes=1, memory_cost=32
)
digest = argon2id.derive(b"password")
with pytest.raises(AlreadyFinalized):
argon2id.verify(b"password", digest)
@pytest.mark.parametrize("digest", [b"invalidkey", b"0" * 32])
def test_invalid_verify(self, digest, backend):
argon2id = Argon2id(
salt=b"salt" * 2, length=32, iterations=1, lanes=1, memory_cost=32
)
with pytest.raises(InvalidKey):
argon2id.verify(b"password", digest)
def test_verify(self, backend):
argon2id = Argon2id(
salt=b"salt" * 2,
length=32,
iterations=1,
lanes=1,
memory_cost=32,
ad=None,
secret=None,
)
digest = argon2id.derive(b"password")
Argon2id(
salt=b"salt" * 2, length=32, iterations=1, lanes=1, memory_cost=32
).verify(b"password", digest)
def test_derive_phc_encoded(self, backend):
# Test that we can generate a PHC formatted string
argon2id = Argon2id(
salt=b"0" * 8,
length=32,
iterations=2,
lanes=2,
memory_cost=64,
)
encoded = argon2id.derive_phc_encoded(b"password")
# Verify the general format is correct
assert encoded == (
"$argon2id$v=19$m=64,t=2,p=2$"
"MDAwMDAwMDA$"
"jFn1qYAgmfVKFWVeUGQcVK4d8RSiQJFTS7R7VII+fRk"
)
def test_verify_phc_encoded(self):
# First generate a PHC string
argon2id = Argon2id(
salt=b"0" * 8,
length=32,
iterations=1,
lanes=1,
memory_cost=32,
)
encoded = argon2id.derive_phc_encoded(b"password")
Argon2id.verify_phc_encoded(b"password", encoded)
Argon2id(
salt=b"0" * 8,
length=32,
iterations=1,
lanes=1,
memory_cost=32,
).verify(b"password", base64.b64decode(encoded.split("$")[-1] + "="))
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(b"wrong_password", encoded)
def test_verify_phc_vector(self):
# From https://github.com/P-H-C/phc-string-format/blob/master/phc-sf-spec.md#example
Argon2id.verify_phc_encoded(
b"hunter2",
"$argon2id$v=19$m=65536,t=2,p=1$gZiV/M1gPc22ElAH/Jh1Hw$CWOrkoo7oJBQ/iyh7uJ0LO2aLEfrHwTWllSAxT0zRno",
secret=b"pepper",
)
def test_verify_phc_encoded_invalid_format(self):
# Totally invalid string
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(b"password", "not-a-valid-format")
# Invalid algorithm
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password", "$argon2i$v=19$m=32,t=1,p=1$c2FsdHNhbHQ$hash"
)
# Invalid version
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password", "$argon2id$v=18$m=32,t=1,p=1$c2FsdHNhbHQ$hash"
)
# Missing parameters
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password", "$argon2id$v=19$m=32,t=1$c2FsdHNhbHQ$hash"
)
# Parameters in wrong order
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password", "$argon2id$v=19$t=1,m=32,p=1$c2FsdHNhbHQ$hash"
)
# Invalid memory cost
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password", "$argon2id$v=19$m=abc,t=1,p=1$!invalid!$hash"
)
# Invalid iterations
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password", "$argon2id$v=19$m=32,t=abc,p=1$!invalid!$hash"
)
# Invalid lanes
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password", "$argon2id$v=19$m=32,t=1,p=abc$!invalid!$hash"
)
# Invalid base64 in salt
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password", "$argon2id$v=19$m=32,t=1,p=1$!invalid!$hash"
)
# Invalid base64 in hash
with pytest.raises(InvalidKey):
Argon2id.verify_phc_encoded(
b"password",
"$argon2id$v=19$m=32,t=1,p=1$c2FsdHNhbHQ$!invalid!",
)
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