1 files changed, 144 insertions, 0 deletions
diff --git a/tests/wycheproof/test_aes.py b/tests/wycheproof/test_aes.py
new file mode 100644
index 00000000..55e45454
--- /dev/null
+++ b/tests/wycheproof/test_aes.py
@@ -0,0 +1,144 @@
+# 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.
+
+from __future__ import absolute_import, division, print_function
+
+import binascii
+
+import pytest
+
+from cryptography.exceptions import InvalidTag
+from cryptography.hazmat.backends.interfaces import CipherBackend
+from cryptography.hazmat.primitives import padding
+from cryptography.hazmat.primitives.ciphers import (
+    Cipher, algorithms, modes
+)
+from cryptography.hazmat.primitives.ciphers.aead import AESCCM, AESGCM
+
+from ..hazmat.primitives.test_aead import _aead_supported
+
+
+@pytest.mark.requires_backend_interface(interface=CipherBackend)
+@pytest.mark.wycheproof_tests("aes_cbc_pkcs5_test.json")
+def test_aes_cbc_pkcs5(backend, wycheproof):
+    key = binascii.unhexlify(wycheproof.testcase["key"])
+    iv = binascii.unhexlify(wycheproof.testcase["iv"])
+    msg = binascii.unhexlify(wycheproof.testcase["msg"])
+    ct = binascii.unhexlify(wycheproof.testcase["ct"])
+
+    padder = padding.PKCS7(128).padder()
+
+    cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend)
+    enc = cipher.encryptor()
+    computed_ct = enc.update(
+        padder.update(msg) + padder.finalize()) + enc.finalize()
+    dec = cipher.decryptor()
+    padded_msg = dec.update(ct) + dec.finalize()
+    unpadder = padding.PKCS7(128).unpadder()
+    if wycheproof.valid or wycheproof.acceptable:
+        assert computed_ct == ct
+        computed_msg = unpadder.update(padded_msg) + unpadder.finalize()
+        assert computed_msg == msg
+    else:
+        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
+    elif len(iv) == 0:
+        with pytest.raises(ValueError):
+            Cipher(algorithms.AES(key), modes.GCM(iv), backend)
+    else:
+        dec = Cipher(
+            algorithms.AES(key),
+            modes.GCM(iv, tag, min_tag_length=len(tag)),
+            backend
+        ).decryptor()
+        dec.authenticate_additional_data(aad)
+        dec.update(ct)
+        with pytest.raises(InvalidTag):
+            dec.finalize()
+
+
+@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
+    elif len(iv) == 0:
+        with pytest.raises(ValueError):
+            aesgcm.encrypt(iv, msg, aad)
+    else:
+        with pytest.raises(InvalidTag):
+            aesgcm.decrypt(iv, ct + tag, aad)
+
+
+@pytest.mark.skipif(
+    not _aead_supported(AESCCM),
+    reason="Requires OpenSSL with AES-CCM support",
+)
+@pytest.mark.requires_backend_interface(interface=CipherBackend)
+@pytest.mark.wycheproof_tests("aes_ccm_test.json")
+def test_aes_ccm_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"])
+
+    if (
+        wycheproof.invalid and
+        wycheproof.testcase["comment"] == "Invalid tag size"
+    ):
+        with pytest.raises(ValueError):
+            AESCCM(key, tag_length=wycheproof.testgroup["tagSize"] // 8)
+        return
+
+    aesccm = AESCCM(key, tag_length=wycheproof.testgroup["tagSize"] // 8)
+    if wycheproof.valid or wycheproof.acceptable:
+        computed_ct = aesccm.encrypt(iv, msg, aad)
+        assert computed_ct == ct + tag
+        computed_msg = aesccm.decrypt(iv, ct + tag, aad)
+        assert computed_msg == msg
+    elif not 7 <= len(iv) <= 13:
+        with pytest.raises(ValueError):
+            aesccm.decrypt(iv, ct + tag, aad)
+    else:
+        with pytest.raises(InvalidTag):
+            aesccm.decrypt(iv, ct + tag, aad)