def new_aes_eax_key_template(self, iv_size, key_size):
key_format = aes_eax_pb2.AesEaxKeyFormat()
key_format.params.iv_size = iv_size
key_format.key_size = key_size
key_template = tink_pb2.KeyTemplate()
key_template.type_url = 'type.googleapis.com/google.crypto.tink.AesEaxKey'
key_template.value = key_format.SerializeToString()
return key_template.SerializeToString()
def test_aes256_eax(self):
template = aead_key_templates.AES256_EAX
self.assertEqual('type.googleapis.com/google.crypto.tink.AesEaxKey',
template.type_url)
self.assertEqual(tink_pb2.TINK, template.output_prefix_type)
key_format = aes_eax_pb2.AesEaxKeyFormat()
key_format.ParseFromString(template.value)
self.assertEqual(32, key_format.key_size)
self.assertEqual(16, key_format.params.iv_size)
def create_aes_eax_key_template(key_size: int,
iv_size: int) -> tink_pb2.KeyTemplate:
"""Creates an AES EAX KeyTemplate, and fills in its values."""
key_format = aes_eax_pb2.AesEaxKeyFormat()
key_format.params.iv_size = iv_size
key_format.key_size = key_size
key_template = tink_pb2.KeyTemplate()
key_template.value = key_format.SerializeToString()
key_template.type_url = _AES_EAX_KEY_TYPE_URL
key_template.output_prefix_type = tink_pb2.TINK
return key_template
def test_create_aes_eax_key_template(self):
# Intentionally using 'weird' or invalid values for parameters,
# to test that the function correctly puts them in the resulting template.
template = aead_key_templates.create_aes_eax_key_template(key_size=42,
iv_size=72)
self.assertEqual('type.googleapis.com/google.crypto.tink.AesEaxKey',
template.type_url)
self.assertEqual(tink_pb2.TINK, template.output_prefix_type)
key_format = aes_eax_pb2.AesEaxKeyFormat()
key_format.ParseFromString(template.value)
self.assertEqual(42, key_format.key_size)
self.assertEqual(72, key_format.params.iv_size)