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add wycheproof gcm tests (#4349)

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* add wycheproof gcm tests

* add AEAD test
This commit is contained in:
Paul Kehrer 2018-07-18 00:44:55 +08:00 committed by Alex Gaynor
parent c563b576b3
commit 4de004955b
1 changed files with 54 additions and 0 deletions
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54
tests/wycheproof/test_aes.py
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@ -13,6 +13,7 @@ from cryptography.hazmat.primitives import padding
from cryptography.hazmat.primitives.ciphers import (
Cipher, algorithms, modes
)
from cryptography.hazmat.primitives.ciphers.aead import AESGCM
@pytest.mark.requires_backend_interface(interface=CipherBackend)
@ -40,3 +41,56 @@ def test_aes_cbc_pkcs5(backend, wycheproof):
assert computed_ct != ct
with pytest.raises(ValueError):
unpadder.update(padded_msg) + unpadder.finalize()
@pytest.mark.requires_backend_interface(interface=CipherBackend)
@pytest.mark.wycheproof_tests("aes_gcm_test.json")
def test_aes_gcm(backend, wycheproof):
key = binascii.unhexlify(wycheproof.testcase["key"])
iv = binascii.unhexlify(wycheproof.testcase["iv"])
aad = binascii.unhexlify(wycheproof.testcase["aad"])
msg = binascii.unhexlify(wycheproof.testcase["msg"])
ct = binascii.unhexlify(wycheproof.testcase["ct"])
tag = binascii.unhexlify(wycheproof.testcase["tag"])
if wycheproof.valid or wycheproof.acceptable:
enc = Cipher(algorithms.AES(key), modes.GCM(iv), backend).encryptor()
enc.authenticate_additional_data(aad)
computed_ct = enc.update(msg) + enc.finalize()
computed_tag = enc.tag
assert computed_ct == ct
assert computed_tag == tag
dec = Cipher(
algorithms.AES(key),
modes.GCM(iv, tag, min_tag_length=len(tag)),
backend
).decryptor()
dec.authenticate_additional_data(aad)
computed_msg = dec.update(ct) + dec.finalize()
assert computed_msg == msg
else:
# All invalid GCM tests are IV len 0 right now
assert len(iv) == 0
with pytest.raises(ValueError):
Cipher(algorithms.AES(key), modes.GCM(iv), backend)
@pytest.mark.requires_backend_interface(interface=CipherBackend)
@pytest.mark.wycheproof_tests("aes_gcm_test.json")
def test_aes_gcm_aead_api(backend, wycheproof):
key = binascii.unhexlify(wycheproof.testcase["key"])
iv = binascii.unhexlify(wycheproof.testcase["iv"])
aad = binascii.unhexlify(wycheproof.testcase["aad"])
msg = binascii.unhexlify(wycheproof.testcase["msg"])
ct = binascii.unhexlify(wycheproof.testcase["ct"])
tag = binascii.unhexlify(wycheproof.testcase["tag"])
aesgcm = AESGCM(key)
if wycheproof.valid or wycheproof.acceptable:
computed_ct = aesgcm.encrypt(iv, msg, aad)
assert computed_ct == ct + tag
computed_msg = aesgcm.decrypt(iv, ct + tag, aad)
assert computed_msg == msg
else:
# All invalid GCM tests are IV len 0 right now
assert len(iv) == 0
with pytest.raises(ValueError):
aesgcm.encrypt(iv, msg, aad)