def test_key_rotation(self, enc_lang, dec_lang, old_key_tmpl,
new_key_tmpl):
# Do a key rotation from an old key generated from old_key_tmpl to a new
# key generated from new_key_tmpl. Encryption and decryption are done
# in languages enc_lang and dec_lang.
builder = keyset_builder.new_keyset_builder()
older_key_id = builder.add_new_key(old_key_tmpl)
builder.set_primary_key(older_key_id)
enc_aead1 = testing_servers.aead(enc_lang, builder.keyset())
dec_aead1 = testing_servers.aead(dec_lang, builder.keyset())
newer_key_id = builder.add_new_key(new_key_tmpl)
enc_aead2 = testing_servers.aead(enc_lang, builder.keyset())
dec_aead2 = testing_servers.aead(dec_lang, builder.keyset())
builder.set_primary_key(newer_key_id)
enc_aead3 = testing_servers.aead(enc_lang, builder.keyset())
dec_aead3 = testing_servers.aead(dec_lang, builder.keyset())
builder.disable_key(older_key_id)
enc_aead4 = testing_servers.aead(enc_lang, builder.keyset())
dec_aead4 = testing_servers.aead(dec_lang, builder.keyset())
self.assertNotEqual(older_key_id, newer_key_id)
# 1 encrypts with the older key. So 1, 2 and 3 can decrypt it, but not 4.
ciphertext1 = enc_aead1.encrypt(b'plaintext', b'ad')
self.assertEqual(dec_aead1.decrypt(ciphertext1, b'ad'), b'plaintext')
self.assertEqual(dec_aead2.decrypt(ciphertext1, b'ad'), b'plaintext')
self.assertEqual(dec_aead3.decrypt(ciphertext1, b'ad'), b'plaintext')
with self.assertRaises(tink.TinkError):
_ = dec_aead4.decrypt(ciphertext1, b'ad')
# 2 encrypts with the older key. So 1, 2 and 3 can decrypt it, but not 4.
ciphertext2 = enc_aead2.encrypt(b'plaintext', b'ad')
self.assertEqual(dec_aead1.decrypt(ciphertext2, b'ad'), b'plaintext')
self.assertEqual(dec_aead2.decrypt(ciphertext2, b'ad'), b'plaintext')
self.assertEqual(dec_aead3.decrypt(ciphertext2, b'ad'), b'plaintext')
with self.assertRaises(tink.TinkError):
_ = dec_aead4.decrypt(ciphertext2, b'ad')
# 3 encrypts with the newer key. So 2, 3 and 4 can decrypt it, but not 1.
ciphertext3 = enc_aead3.encrypt(b'plaintext', b'ad')
with self.assertRaises(tink.TinkError):
_ = dec_aead1.decrypt(ciphertext3, b'ad')
self.assertEqual(dec_aead2.decrypt(ciphertext3, b'ad'), b'plaintext')
self.assertEqual(dec_aead3.decrypt(ciphertext3, b'ad'), b'plaintext')
self.assertEqual(dec_aead4.decrypt(ciphertext3, b'ad'), b'plaintext')
# 4 encrypts with the newer key. So 2, 3 and 4 can decrypt it, but not 1.
ciphertext4 = enc_aead4.encrypt(b'plaintext', b'ad')
with self.assertRaises(tink.TinkError):
_ = dec_aead1.decrypt(ciphertext4, b'ad')
self.assertEqual(dec_aead2.decrypt(ciphertext4, b'ad'), b'plaintext')
self.assertEqual(dec_aead3.decrypt(ciphertext4, b'ad'), b'plaintext')
self.assertEqual(dec_aead4.decrypt(ciphertext4, b'ad'), b'plaintext')
def test_key_rotation(self, compute_lang, verify_lang, old_key_tmpl,
new_key_tmpl):
# Do a key rotation from an old key generated from old_key_tmpl to a new
# key generated from new_key_tmpl. MAC computation and verification are done
# in languages compute_lang and verify_lang.
builder = keyset_builder.new_keyset_builder()
older_key_id = builder.add_new_key(old_key_tmpl)
builder.set_primary_key(older_key_id)
compute_mac1 = testing_servers.mac(compute_lang, builder.keyset())
verify_mac1 = testing_servers.mac(verify_lang, builder.keyset())
newer_key_id = builder.add_new_key(new_key_tmpl)
compute_mac2 = testing_servers.mac(compute_lang, builder.keyset())
verify_mac2 = testing_servers.mac(verify_lang, builder.keyset())
builder.set_primary_key(newer_key_id)
compute_mac3 = testing_servers.mac(compute_lang, builder.keyset())
verify_mac3 = testing_servers.mac(verify_lang, builder.keyset())
builder.disable_key(older_key_id)
compute_mac4 = testing_servers.mac(compute_lang, builder.keyset())
verify_mac4 = testing_servers.mac(verify_lang, builder.keyset())
self.assertNotEqual(older_key_id, newer_key_id)
# 1 uses the older key. So 1, 2 and 3 can verify the mac, but not 4.
mac_value1 = compute_mac1.compute_mac(b'plaintext')
verify_mac1.verify_mac(mac_value1, b'plaintext')
verify_mac2.verify_mac(mac_value1, b'plaintext')
verify_mac3.verify_mac(mac_value1, b'plaintext')
with self.assertRaises(tink.TinkError):
verify_mac4.verify_mac(mac_value1, b'plaintext')
# 2 uses the older key. So 1, 2 and 3 can verify the mac, but not 4.
mac_value2 = compute_mac2.compute_mac(b'plaintext')
verify_mac1.verify_mac(mac_value2, b'plaintext')
verify_mac2.verify_mac(mac_value2, b'plaintext')
verify_mac3.verify_mac(mac_value2, b'plaintext')
with self.assertRaises(tink.TinkError):
verify_mac4.verify_mac(mac_value2, b'plaintext')
# 3 uses the newer key. So 2, 3 and 4 can verify the mac, but not 1.
mac_value3 = compute_mac3.compute_mac(b'plaintext')
with self.assertRaises(tink.TinkError):
verify_mac1.verify_mac(mac_value3, b'plaintext')
verify_mac2.verify_mac(mac_value3, b'plaintext')
verify_mac3.verify_mac(mac_value3, b'plaintext')
verify_mac4.verify_mac(mac_value3, b'plaintext')
# 4 uses the newer key. So 2, 3 and 4 can verify the mac, but not 1.
mac_value4 = compute_mac4.compute_mac(b'plaintext')
with self.assertRaises(tink.TinkError):
verify_mac1.verify_mac(mac_value4, b'plaintext')
verify_mac2.verify_mac(mac_value4, b'plaintext')
verify_mac3.verify_mac(mac_value4, b'plaintext')
verify_mac4.verify_mac(mac_value4, b'plaintext')
def test_key_rotation(self):
builder = keyset_builder.new_keyset_builder()
older_key_id = builder.add_new_key(aead.aead_key_templates.AES128_GCM)
builder.set_primary_key(older_key_id)
p1 = builder.keyset_handle().primitive(aead.Aead)
newer_key_id = builder.add_new_key(aead.aead_key_templates.AES128_GCM)
p2 = builder.keyset_handle().primitive(aead.Aead)
builder.set_primary_key(newer_key_id)
p3 = builder.keyset_handle().primitive(aead.Aead)
builder.disable_key(older_key_id)
p4 = builder.keyset_handle().primitive(aead.Aead)
builder.delete_key(older_key_id)
self.assertNotEqual(older_key_id, newer_key_id)
# p1 encrypts with the older key. So p1, p2 and p3 can decrypt it,
# but not p4.
ciphertext1 = p1.encrypt(b'plaintext', b'ad')
self.assertEqual(p1.decrypt(ciphertext1, b'ad'), b'plaintext')
self.assertEqual(p2.decrypt(ciphertext1, b'ad'), b'plaintext')
self.assertEqual(p3.decrypt(ciphertext1, b'ad'), b'plaintext')
with self.assertRaises(tink.TinkError):
_ = p4.decrypt(ciphertext1, b'ad')
# p2 encrypts with the older key. So p1, p2 and p3 can decrypt it,
# but not p4.
ciphertext2 = p2.encrypt(b'plaintext', b'ad')
self.assertEqual(p1.decrypt(ciphertext2, b'ad'), b'plaintext')
self.assertEqual(p2.decrypt(ciphertext2, b'ad'), b'plaintext')
self.assertEqual(p3.decrypt(ciphertext2, b'ad'), b'plaintext')
with self.assertRaises(tink.TinkError):
_ = p4.decrypt(ciphertext2, b'ad')
# p3 encrypts with the newer key. So p2, p3 and p4 can decrypt it,
# but not p1.
ciphertext3 = p3.encrypt(b'plaintext', b'ad')
with self.assertRaises(tink.TinkError):
_ = p1.decrypt(ciphertext3, b'ad')
self.assertEqual(p2.decrypt(ciphertext3, b'ad'), b'plaintext')
self.assertEqual(p3.decrypt(ciphertext3, b'ad'), b'plaintext')
self.assertEqual(p4.decrypt(ciphertext3, b'ad'), b'plaintext')
# p4 encrypts with the newer key. So p2, p3 and p4 can decrypt it,
# but not p1.
ciphertext4 = p3.encrypt(b'plaintext', b'ad')
with self.assertRaises(tink.TinkError):
_ = p1.decrypt(ciphertext4, b'ad')
self.assertEqual(p2.decrypt(ciphertext4, b'ad'), b'plaintext')
self.assertEqual(p3.decrypt(ciphertext4, b'ad'), b'plaintext')
self.assertEqual(p4.decrypt(ciphertext4, b'ad'), b'plaintext')
def test_operation_on_unknown_key_fails(self):
builder = keyset_builder.new_keyset_builder()
key_id = builder.add_new_key(aead.aead_key_templates.AES128_GCM)
unknown_key_id = key_id + 1
with self.assertRaises(tink.TinkError):
builder.set_primary_key(unknown_key_id)
with self.assertRaises(tink.TinkError):
builder.enable_key(unknown_key_id)
with self.assertRaises(tink.TinkError):
builder.disable_key(unknown_key_id)
with self.assertRaises(tink.TinkError):
builder.delete_key(unknown_key_id)
def test_keyset_conversion(self):
builder1 = keyset_builder.new_keyset_builder()
new_key_id = builder1.add_new_key(aead.aead_key_templates.AES128_GCM)
builder1.set_primary_key(new_key_id)
keyset = builder1.keyset()
keyset_handle1 = builder1.keyset_handle()
p1 = keyset_handle1.primitive(aead.Aead)
builder2 = keyset_builder.from_keyset(keyset)
keyset_handle2 = builder2.keyset_handle()
p2 = keyset_handle2.primitive(aead.Aead)
ciphertext = p1.encrypt(b'plaintext', b'ad')
self.assertEqual(p2.decrypt(ciphertext, b'ad'), b'plaintext')
def test_set_primary_success(self):
builder = keyset_builder.new_keyset_builder()
secondary_key_id = builder.add_new_key(
aead.aead_key_templates.AES128_GCM)
builder.set_primary_key(secondary_key_id)
def test_add_new_key_new_id(self):
builder = keyset_builder.new_keyset_builder()
key_id1 = builder.add_new_key(aead.aead_key_templates.AES128_GCM)
key_id2 = builder.add_new_key(aead.aead_key_templates.AES128_GCM)
self.assertNotEqual(key_id1, key_id2)
def gen_keyset_with_2_prfs() -> bytes:
builder = keyset_builder.new_keyset_builder()
builder.add_new_key(prf.prf_key_templates.HMAC_SHA256)
primary_key_id = builder.add_new_key(prf.prf_key_templates.HKDF_SHA256)
builder.set_primary_key(primary_key_id)
return builder.keyset()
def gen_keyset(key_template_name: Text) -> bytes:
builder = keyset_builder.new_keyset_builder()
primary_key_id = builder.add_new_key(
supported_key_types.KEY_TEMPLATE[key_template_name])
builder.set_primary_key(primary_key_id)
return builder.keyset()
def test_key_rotation(self, enc_lang, dec_lang):
# Do a key rotation from an old key to a new key.
# Encryption and decryption are done in languages enc_lang and dec_lang.
builder = keyset_builder.new_keyset_builder()
older_key_id = builder.add_new_key(
streaming_aead.streaming_aead_key_templates.AES128_GCM_HKDF_4KB)
builder.set_primary_key(older_key_id)
enc1 = testing_servers.streaming_aead(enc_lang, builder.keyset())
dec1 = testing_servers.streaming_aead(dec_lang, builder.keyset())
newer_key_id = builder.add_new_key(
streaming_aead.streaming_aead_key_templates.AES256_GCM_HKDF_4KB)
enc2 = testing_servers.streaming_aead(enc_lang, builder.keyset())
dec2 = testing_servers.streaming_aead(dec_lang, builder.keyset())
builder.set_primary_key(newer_key_id)
enc3 = testing_servers.streaming_aead(enc_lang, builder.keyset())
dec3 = testing_servers.streaming_aead(dec_lang, builder.keyset())
builder.disable_key(older_key_id)
enc4 = testing_servers.streaming_aead(enc_lang, builder.keyset())
dec4 = testing_servers.streaming_aead(dec_lang, builder.keyset())
self.assertNotEqual(older_key_id, newer_key_id)
# 1 encrypts with the older key. So 1, 2 and 3 can decrypt it, but not 4.
plaintext = LONG_PLAINTEXT
ad = b'associated_data'
ciphertext1 = enc1.new_encrypting_stream(io.BytesIO(plaintext),
ad).read()
self.assertEqual(
dec1.new_decrypting_stream(io.BytesIO(ciphertext1), ad).read(),
plaintext)
self.assertEqual(
dec2.new_decrypting_stream(io.BytesIO(ciphertext1), ad).read(),
plaintext)
self.assertEqual(
dec3.new_decrypting_stream(io.BytesIO(ciphertext1), ad).read(),
plaintext)
with self.assertRaises(tink.TinkError):
_ = dec4.new_decrypting_stream(io.BytesIO(ciphertext1), ad).read()
# 2 encrypts with the older key. So 1, 2 and 3 can decrypt it, but not 4.
ciphertext2 = enc2.new_encrypting_stream(io.BytesIO(plaintext),
ad).read()
self.assertEqual(
dec1.new_decrypting_stream(io.BytesIO(ciphertext2), ad).read(),
plaintext)
self.assertEqual(
dec2.new_decrypting_stream(io.BytesIO(ciphertext2), ad).read(),
plaintext)
self.assertEqual(
dec3.new_decrypting_stream(io.BytesIO(ciphertext2), ad).read(),
plaintext)
with self.assertRaises(tink.TinkError):
_ = dec4.new_decrypting_stream(io.BytesIO(ciphertext2), ad).read()
# 3 encrypts with the newer key. So 2, 3 and 4 can decrypt it, but not 1.
ciphertext3 = enc3.new_encrypting_stream(io.BytesIO(plaintext),
ad).read()
with self.assertRaises(tink.TinkError):
_ = dec1.new_decrypting_stream(io.BytesIO(ciphertext3), ad).read()
self.assertEqual(
dec2.new_decrypting_stream(io.BytesIO(ciphertext3), ad).read(),
plaintext)
self.assertEqual(
dec3.new_decrypting_stream(io.BytesIO(ciphertext3), ad).read(),
plaintext)
self.assertEqual(
dec4.new_decrypting_stream(io.BytesIO(ciphertext3), ad).read(),
plaintext)
# 4 encrypts with the newer key. So 2, 3 and 4 can decrypt it, but not 1.
ciphertext4 = enc4.new_encrypting_stream(io.BytesIO(plaintext),
ad).read()
with self.assertRaises(tink.TinkError):
_ = dec1.new_decrypting_stream(io.BytesIO(ciphertext4), ad).read()
self.assertEqual(
dec2.new_decrypting_stream(io.BytesIO(ciphertext4), ad).read(),
plaintext)
self.assertEqual(
dec3.new_decrypting_stream(io.BytesIO(ciphertext4), ad).read(),
plaintext)
self.assertEqual(
dec4.new_decrypting_stream(io.BytesIO(ciphertext4), ad).read(),
plaintext)
