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import pytest
from moto.kms.exceptions import (
AccessDeniedException,
InvalidCiphertextException,
NotFoundException,
ValidationException,
)
from moto.kms.models import Key
from moto.kms.utils import (
MASTER_KEY_LEN,
Ciphertext,
ECDSAPrivateKey,
KeySpec,
RSAPrivateKey,
SigningAlgorithm,
_deserialize_ciphertext_blob,
_serialize_ciphertext_blob,
_serialize_encryption_context,
decrypt,
encrypt,
generate_data_key,
generate_master_key,
)
ENCRYPTION_CONTEXT_VECTORS = [
(
{"this": "is", "an": "encryption", "context": "example"},
b"anencryptioncontextexamplethisis",
),
(
{"a_this": "one", "b_is": "actually", "c_in": "order"},
b"a_thisoneb_isactuallyc_inorder",
),
]
CIPHERTEXT_BLOB_VECTORS = [
(
Ciphertext(
key_id="d25652e4-d2d2-49f7-929a-671ccda580c6",
iv=b"123456789012",
ciphertext=b"some ciphertext",
tag=b"1234567890123456",
),
b"d25652e4-d2d2-49f7-929a-671ccda580c6"
b"123456789012"
b"1234567890123456"
b"some ciphertext",
),
(
Ciphertext(
key_id="d25652e4-d2d2-49f7-929a-671ccda580c6",
iv=b"123456789012",
ciphertext=b"some ciphertext that is much longer now",
tag=b"1234567890123456",
),
b"d25652e4-d2d2-49f7-929a-671ccda580c6"
b"123456789012"
b"1234567890123456"
b"some ciphertext that is much longer now",
),
]
def test_KeySpec_Enum():
assert KeySpec.rsa_key_specs() == sorted(
[KeySpec.RSA_2048, KeySpec.RSA_3072, KeySpec.RSA_4096]
)
assert KeySpec.ecc_key_specs() == sorted(
[
KeySpec.ECC_NIST_P256,
KeySpec.ECC_SECG_P256K1,
KeySpec.ECC_NIST_P384,
KeySpec.ECC_NIST_P521,
]
)
assert KeySpec.hmac_key_specs() == sorted(
[KeySpec.HMAC_224, KeySpec.HMAC_256, KeySpec.HMAC_284, KeySpec.HMAC_512]
)
def test_SigningAlgorithm_Enum():
assert SigningAlgorithm.rsa_signing_algorithms() == sorted(
[
SigningAlgorithm.RSASSA_PSS_SHA_256,
SigningAlgorithm.RSASSA_PSS_SHA_384,
SigningAlgorithm.RSASSA_PSS_SHA_512,
SigningAlgorithm.RSASSA_PKCS1_V1_5_SHA_256,
SigningAlgorithm.RSASSA_PKCS1_V1_5_SHA_384,
SigningAlgorithm.RSASSA_PKCS1_V1_5_SHA_512,
]
)
assert SigningAlgorithm.ecc_signing_algorithms() == sorted(
[
SigningAlgorithm.ECDSA_SHA_256,
SigningAlgorithm.ECDSA_SHA_384,
SigningAlgorithm.ECDSA_SHA_512,
]
)
def test_RSAPrivateKey_invalid_key_size():
with pytest.raises(ValidationException) as ex:
_ = RSAPrivateKey(key_size=100)
assert (
ex.value.message
== "1 validation error detected: Value at 'key_size' failed to satisfy constraint: Member must satisfy enum value set: [2048, 3072, 4096]"
)
def test_ECDSAPrivateKey_invalid_key_spec():
with pytest.raises(ValidationException) as ex:
_ = ECDSAPrivateKey(key_spec="InvalidKeySpec")
assert (
ex.value.message
== "1 validation error detected: Value at 'key_spec' failed to satisfy constraint: Member must satisfy enum value set: ['ECC_NIST_P256', 'ECC_NIST_P384', 'ECC_NIST_P521', 'ECC_SECG_P256K1']"
)
def test_generate_data_key():
test = generate_data_key(123)
assert isinstance(test, bytes)
assert len(test) == 123
def test_generate_master_key():
test = generate_master_key()
assert isinstance(test, bytes)
assert len(test) == MASTER_KEY_LEN
@pytest.mark.parametrize("raw,serialized", ENCRYPTION_CONTEXT_VECTORS)
def test_serialize_encryption_context(raw, serialized):
test = _serialize_encryption_context(raw)
assert test == serialized
@pytest.mark.parametrize("raw,_serialized", CIPHERTEXT_BLOB_VECTORS)
def test_cycle_ciphertext_blob(raw, _serialized):
test_serialized = _serialize_ciphertext_blob(raw)
test_deserialized = _deserialize_ciphertext_blob(test_serialized)
assert test_deserialized == raw
@pytest.mark.parametrize("raw,serialized", CIPHERTEXT_BLOB_VECTORS)
def test_serialize_ciphertext_blob(raw, serialized):
test = _serialize_ciphertext_blob(raw)
assert test == serialized
@pytest.mark.parametrize("raw,serialized", CIPHERTEXT_BLOB_VECTORS)
def test_deserialize_ciphertext_blob(raw, serialized):
test = _deserialize_ciphertext_blob(serialized)
assert test == raw
@pytest.mark.parametrize(
"encryption_context", [ec[0] for ec in ENCRYPTION_CONTEXT_VECTORS]
)
def test_encrypt_decrypt_cycle(encryption_context):
plaintext = b"some secret plaintext"
master_key = Key("nop", "nop", "nop", "nop", "nop", "nop")
master_key_map = {master_key.id: master_key}
ciphertext_blob = encrypt(
master_keys=master_key_map,
key_id=master_key.id,
plaintext=plaintext,
encryption_context=encryption_context,
)
assert ciphertext_blob != plaintext
decrypted, decrypting_key_id = decrypt(
master_keys=master_key_map,
ciphertext_blob=ciphertext_blob,
encryption_context=encryption_context,
)
assert decrypted == plaintext
assert decrypting_key_id == master_key.id
def test_encrypt_unknown_key_id():
with pytest.raises(NotFoundException):
encrypt(
master_keys={},
key_id="anything",
plaintext=b"secrets",
encryption_context={},
)
def test_decrypt_invalid_ciphertext_format():
master_key = Key("nop", "nop", "nop", "nop", "nop", "nop")
master_key_map = {master_key.id: master_key}
with pytest.raises(InvalidCiphertextException):
decrypt(master_keys=master_key_map, ciphertext_blob=b"", encryption_context={})
def test_decrypt_unknwown_key_id():
ciphertext_blob = (
b"d25652e4-d2d2-49f7-929a-671ccda580c6"
b"123456789012"
b"1234567890123456"
b"some ciphertext"
)
with pytest.raises(AccessDeniedException):
decrypt(master_keys={}, ciphertext_blob=ciphertext_blob, encryption_context={})
def test_decrypt_invalid_ciphertext():
master_key = Key("nop", "nop", "nop", "nop", "nop", "nop")
master_key_map = {master_key.id: master_key}
ciphertext_blob = (
master_key.id.encode("utf-8") + b"1234567890121234567890123456some ciphertext"
)
with pytest.raises(InvalidCiphertextException):
decrypt(
master_keys=master_key_map,
ciphertext_blob=ciphertext_blob,
encryption_context={},
)
def test_decrypt_invalid_encryption_context():
plaintext = b"some secret plaintext"
master_key = Key("nop", "nop", "nop", "nop", "nop", "nop")
master_key_map = {master_key.id: master_key}
ciphertext_blob = encrypt(
master_keys=master_key_map,
key_id=master_key.id,
plaintext=plaintext,
encryption_context={"some": "encryption", "context": "here"},
)
with pytest.raises(InvalidCiphertextException):
decrypt(
master_keys=master_key_map,
ciphertext_blob=ciphertext_blob,
encryption_context={},
)
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