def test_only_tink_output_prefix_type_encodes_a_kid_header(self): handle = tink.new_keyset_handle(jwt.raw_jwt_es256_template()) sign = handle.primitive(jwt.JwtPublicKeySign) verify = handle.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) tink_handle = _change_output_prefix_to_tink(handle) tink_sign = tink_handle.primitive(jwt.JwtPublicKeySign) tink_verify = tink_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) raw_jwt = jwt.new_raw_jwt(issuer='issuer', without_expiration=True) token = sign.sign_and_encode(raw_jwt) token_with_kid = tink_sign.sign_and_encode(raw_jwt) _, header, _, _ = _jwt_format.split_signed_compact(token) self.assertNotIn('kid', _json_util.json_loads(header)) _, header_with_kid, _, _ = _jwt_format.split_signed_compact(token_with_kid) self.assertIn('kid', _json_util.json_loads(header_with_kid)) validator = jwt.new_validator( expected_issuer='issuer', allow_missing_expiration=True) verify.verify_and_decode(token, validator) tink_verify.verify_and_decode(token_with_kid, validator) other_handle = _change_key_id(tink_handle) other_verify = other_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) verify.verify_and_decode(token_with_kid, validator) # For output prefix type TINK, the kid header is required. with self.assertRaises(tink.TinkError): tink_verify.verify_and_decode(token, validator) # This should fail because value of the kid header is wrong. with self.assertRaises(tink.TinkError): other_verify.verify_and_decode(token_with_kid, validator)
def test_es256_key_with_custom_kid_header(self): keyset_handle = tink.new_keyset_handle(jwt.raw_jwt_es256_template()) # Add a custom kid to the key in keyset_handle value = keyset_handle._keyset.key[0].key_data.value ecdsa_key = jwt_ecdsa_pb2.JwtEcdsaPrivateKey.FromString(value) ecdsa_key.public_key.custom_kid.value = 'my kid' keyset_handle._keyset.key[ 0].key_data.value = ecdsa_key.SerializeToString() sign = keyset_handle.primitive(jwt.JwtPublicKeySign) raw_jwt = jwt.new_raw_jwt(issuer='issuer', without_expiration=True) signed_compact = sign.sign_and_encode(raw_jwt) _, json_header, _, _ = _jwt_format.split_signed_compact(signed_compact) header = _jwt_format.json_loads(json_header) self.assertEqual(header['kid'], 'my kid') # Now, change the output prefix type to TINK. This should fail. keyset_handle._keyset.key[0].output_prefix_type = tink_pb2.TINK with self.assertRaises(tink.TinkError): tink_sign = keyset_handle.primitive(jwt.JwtPublicKeySign) tink_sign.sign_and_encode(raw_jwt)
'AES_CMAC_PRF': prf.prf_key_templates.AES_CMAC, 'HMAC_PRF_SHA256': prf.prf_key_templates.HMAC_SHA256, 'HMAC_PRF_SHA512': prf.prf_key_templates.HMAC_SHA512, 'HKDF_PRF_SHA256': prf.prf_key_templates.HKDF_SHA256, 'JWT_HS256': jwt.jwt_hs256_template(), 'JWT_HS256_RAW': jwt.raw_jwt_hs256_template(), 'JWT_HS384': jwt.jwt_hs384_template(), 'JWT_HS384_RAW': jwt.raw_jwt_hs384_template(), 'JWT_HS512': jwt.jwt_hs512_template(), 'JWT_HS512_RAW': jwt.raw_jwt_hs512_template(), 'JWT_ES256': jwt.jwt_es256_template(), 'JWT_ES256_RAW': jwt.raw_jwt_es256_template(), 'JWT_ES384': jwt.jwt_es384_template(), 'JWT_ES384_RAW': jwt.raw_jwt_es384_template(), 'JWT_ES512': jwt.jwt_es512_template(), 'JWT_ES512_RAW': jwt.raw_jwt_es512_template(), 'JWT_RS256_2048_F4': jwt.jwt_rs256_2048_f4_template(), 'JWT_RS256_2048_F4_RAW': jwt.raw_jwt_rs256_2048_f4_template(), 'JWT_RS256_3072_F4': jwt.jwt_rs256_3072_f4_template(), 'JWT_RS256_3072_F4_RAW': jwt.raw_jwt_rs256_3072_f4_template(), 'JWT_RS384_3072_F4': jwt.jwt_rs384_3072_f4_template(), 'JWT_RS384_3072_F4_RAW': jwt.raw_jwt_rs384_3072_f4_template(), 'JWT_RS512_4096_F4': jwt.jwt_rs512_4096_f4_template(), 'JWT_RS512_4096_F4_RAW': jwt.raw_jwt_rs512_4096_f4_template(), 'JWT_PS256_2048_F4': jwt.jwt_ps256_2048_f4_template(), 'JWT_PS256_2048_F4_RAW': jwt.raw_jwt_ps256_2048_f4_template(), 'JWT_PS256_3072_F4': jwt.jwt_ps256_3072_f4_template(),
class JwtKeyTemplatesTest(parameterized.TestCase): @parameterized.named_parameters([ ('JWT_HS256', jwt.jwt_hs256_template()), ('JWT_HS256_RAW', jwt.raw_jwt_hs256_template()), ('JWT_HS384', jwt.jwt_hs384_template()), ('JWT_HS384_RAW', jwt.raw_jwt_hs384_template()), ('JWT_HS512', jwt.jwt_hs512_template()), ('JWT_HS512_RAW', jwt.raw_jwt_hs512_template()), ]) def test_mac_success(self, key_template): keyset_handle = tink.new_keyset_handle(key_template) jwt_hmac = keyset_handle.primitive(jwt.JwtMac) token = jwt.new_raw_jwt(issuer='issuer', subject='subject', without_expiration=True) compact = jwt_hmac.compute_mac_and_encode(token) output_token = jwt_hmac.verify_mac_and_decode( compact, jwt.new_validator(expected_issuer='issuer', allow_missing_expiration=True)) self.assertEqual(output_token.issuer(), token.issuer()) self.assertEqual(output_token.subject(), token.subject()) @parameterized.named_parameters([ ('JWT_ES256', jwt.jwt_es256_template()), ('JWT_ES256_RAW', jwt.raw_jwt_es256_template()), ('JWT_ES384', jwt.jwt_es384_template()), ('JWT_ES384_RAW', jwt.raw_jwt_es384_template()), ('JWT_ES512', jwt.jwt_es512_template()), ('JWT_ES512_RAW', jwt.raw_jwt_es512_template()), ('JWT_RS256_2048_F4', jwt.jwt_rs256_2048_f4_template()), ('JWT_RS256_2048_F4_RAW', jwt.raw_jwt_rs256_2048_f4_template()), ('JWT_RS256_3072_F4', jwt.jwt_rs256_3072_f4_template()), ('JWT_RS256_3072_F4_RAW', jwt.raw_jwt_rs256_3072_f4_template()), ('JWT_RS384_3072_F4', jwt.jwt_rs384_3072_f4_template()), ('JWT_RS384_3072_F4_RAW', jwt.raw_jwt_rs384_3072_f4_template()), ('JWT_RS512_4096_F4', jwt.jwt_rs512_4096_f4_template()), ('JWT_RS512_4096_F4_RAW', jwt.raw_jwt_rs512_4096_f4_template()), ('JWT_PS256_2048_F4', jwt.jwt_ps256_2048_f4_template()), ('JWT_PS256_2048_F4_RAW', jwt.raw_jwt_ps256_2048_f4_template()), ('JWT_PS256_3072_F4', jwt.jwt_ps256_3072_f4_template()), ('JWT_PS256_3072_F4_RAW', jwt.raw_jwt_ps256_3072_f4_template()), ('JWT_PS384_3072_F4', jwt.jwt_ps384_3072_f4_template()), ('JWT_PS384_3072_F4_RAW', jwt.raw_jwt_ps384_3072_f4_template()), ('JWT_PS512_4096_F4', jwt.jwt_ps512_4096_f4_template()), ('JWT_PS512_4096_F4_RAW', jwt.raw_jwt_ps512_4096_f4_template()), ]) def test_new_keydata_primitive_success(self, template): private_handle = tink.new_keyset_handle(template) sign = private_handle.primitive(jwt.JwtPublicKeySign) verify = private_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) raw_jwt = jwt.new_raw_jwt(issuer='issuer', subject='subject', without_expiration=True) compact = sign.sign_and_encode(raw_jwt) verified_jwt = verify.verify_and_decode( compact, jwt.new_validator(expected_issuer='issuer', allow_missing_expiration=True)) self.assertEqual(verified_jwt.issuer(), 'issuer') self.assertEqual(verified_jwt.subject(), 'subject')
'JWT_HS256': jwt.jwt_hs256_template(), 'JWT_HS256_RAW': jwt.raw_jwt_hs256_template(), 'JWT_HS384': jwt.jwt_hs384_template(), 'JWT_HS384_RAW': jwt.raw_jwt_hs384_template(), 'JWT_HS512': jwt.jwt_hs512_template(), 'JWT_HS512_RAW': jwt.raw_jwt_hs512_template(), 'JWT_ES256': jwt.jwt_es256_template(), 'JWT_ES256_RAW': jwt.raw_jwt_es256_template(), 'JWT_ES384': jwt.jwt_es384_template(), 'JWT_ES384_RAW': jwt.raw_jwt_es384_template(), 'JWT_ES512': jwt.jwt_es512_template(), 'JWT_ES512_RAW': jwt.raw_jwt_es512_template(), 'JWT_RS256_2048_F4': jwt.jwt_rs256_2048_f4_template(), 'JWT_RS256_2048_F4_RAW': jwt.raw_jwt_rs256_2048_f4_template(), 'JWT_RS256_3072_F4': jwt.jwt_rs256_3072_f4_template(), 'JWT_RS256_3072_F4_RAW':
def test_weird_tokens_with_valid_signatures(self): handle = tink.new_keyset_handle(jwt.raw_jwt_es256_template()) sign = handle.primitive(jwt.JwtPublicKeySign) # Get the internal PublicKeySign primitive to create valid signatures. wrapped = cast(_jwt_signature_wrappers._WrappedJwtPublicKeySign, sign) raw_sign = cast( _jwt_signature_key_manager._JwtPublicKeySign, wrapped._primitive_set.primary().primitive)._public_key_sign verify = handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) validator = jwt.new_validator(expected_issuer='issuer', allow_missing_expiration=True) # Normal token. valid = gen_compact('{"alg":"ES256"}', '{"iss":"issuer"}', raw_sign) verified_jwt = verify.verify_and_decode(valid, validator) self.assertEqual(verified_jwt.issuer(), 'issuer') # Token with unknown header is valid. unknown_header = gen_compact( '{"alg":"ES256","unknown_header":"abc"} \n ', '{"iss":"issuer" }', raw_sign) verified_jwt = verify.verify_and_decode(unknown_header, validator) self.assertEqual(verified_jwt.issuer(), 'issuer') # Token with unknown kid is valid, since primitives with output prefix type # RAW ignore kid headers. unknown_header = gen_compact('{"alg":"ES256","kid":"unknown"} \n ', '{"iss":"issuer" }', raw_sign) verified_jwt = verify.verify_and_decode(unknown_header, validator) self.assertEqual(verified_jwt.issuer(), 'issuer') # Token with invalid alg header alg_invalid = gen_compact('{"alg":"ES384"}', '{"iss":"issuer"}', raw_sign) with self.assertRaises(tink.TinkError): verify.verify_and_decode(alg_invalid, validator) # Token with empty header empty_header = gen_compact('{}', '{"iss":"issuer"}', raw_sign) with self.assertRaises(tink.TinkError): verify.verify_and_decode(empty_header, validator) # Token header is not valid JSON header_invalid = gen_compact('{"alg":"ES256"', '{"iss":"issuer"}', raw_sign) with self.assertRaises(tink.TinkError): verify.verify_and_decode(header_invalid, validator) # Token payload is not valid JSON payload_invalid = gen_compact('{"alg":"ES256"}', '{"iss":"issuer"', raw_sign) with self.assertRaises(tink.TinkError): verify.verify_and_decode(payload_invalid, validator) # Token with whitespace in header JSON string is valid. whitespace_in_header = gen_compact(' {"alg": \n "ES256"} \n ', '{"iss":"issuer" }', raw_sign) verified_jwt = verify.verify_and_decode(whitespace_in_header, validator) self.assertEqual(verified_jwt.issuer(), 'issuer') # Token with whitespace in payload JSON string is valid. whitespace_in_payload = gen_compact('{"alg":"ES256"}', ' {"iss": \n"issuer" } \n', raw_sign) verified_jwt = verify.verify_and_decode(whitespace_in_payload, validator) self.assertEqual(verified_jwt.issuer(), 'issuer') # Token with whitespace in base64-encoded header is invalid. with_whitespace = (_jwt_format.encode_header('{"alg":"ES256"}') + b' .' + _jwt_format.encode_payload('{"iss":"issuer"}')) token_with_whitespace = _jwt_format.create_signed_compact( with_whitespace, raw_sign.sign(with_whitespace)) with self.assertRaises(tink.TinkError): verify.verify_and_decode(token_with_whitespace, validator) # Token with invalid character is invalid. with_invalid_char = (_jwt_format.encode_header('{"alg":"ES256"}') + b'.?' + _jwt_format.encode_payload('{"iss":"issuer"}')) token_with_invalid_char = _jwt_format.create_signed_compact( with_invalid_char, raw_sign.sign(with_invalid_char)) with self.assertRaises(tink.TinkError): verify.verify_and_decode(token_with_invalid_char, validator) # Token with additional '.' is invalid. with_dot = (_jwt_format.encode_header('{"alg":"ES256"}') + b'.' + _jwt_format.encode_payload('{"iss":"issuer"}') + b'.') token_with_dot = _jwt_format.create_signed_compact( with_dot, raw_sign.sign(with_dot)) with self.assertRaises(tink.TinkError): verify.verify_and_decode(token_with_dot, validator) # num_recursions has been chosen such that parsing of this token fails # in all languages. We want to make sure that the algorithm does not # hang or crash in this case, but only returns a parsing error. num_recursions = 10000 rec_payload = ('{"a":' * num_recursions) + '""' + ('}' * num_recursions) rec_token = gen_compact('{"alg":"ES256"}', rec_payload, raw_sign) with self.assertRaises(tink.TinkError): verify.verify_and_decode( rec_token, validator=jwt.new_validator(allow_missing_expiration=True)) # test wrong types with self.assertRaises(tink.TinkError): verify.verify_and_decode(cast(str, None), validator) with self.assertRaises(tink.TinkError): verify.verify_and_decode(cast(str, 123), validator) with self.assertRaises(tink.TinkError): valid_bytes = valid.encode('utf8') verify.verify_and_decode(cast(str, valid_bytes), validator)
class JwtSignatureWrapperTest(parameterized.TestCase): def test_interesting_error(self): private_handle = tink.new_keyset_handle(jwt.jwt_es256_template()) sign = private_handle.primitive(jwt.JwtPublicKeySign) verify = private_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) raw_jwt = jwt.new_raw_jwt(issuer='issuer', without_expiration=True) compact = sign.sign_and_encode(raw_jwt) with self.assertRaisesRegex(jwt.JwtInvalidError, 'invalid JWT; expected issuer'): verify.verify_and_decode(compact, jwt.new_validator( expected_issuer='unknown', allow_missing_expiration=True)) @parameterized.parameters([ (jwt.raw_jwt_es256_template(), jwt.raw_jwt_es256_template()), (jwt.raw_jwt_es256_template(), jwt.jwt_es256_template()), (jwt.jwt_es256_template(), jwt.raw_jwt_es256_template()), (jwt.jwt_es256_template(), jwt.jwt_es256_template()), ]) def test_key_rotation(self, old_key_tmpl, new_key_tmpl): builder = keyset_builder.new_keyset_builder() older_key_id = builder.add_new_key(old_key_tmpl) builder.set_primary_key(older_key_id) handle1 = builder.keyset_handle() sign1 = handle1.primitive(jwt.JwtPublicKeySign) verify1 = handle1.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) newer_key_id = builder.add_new_key(new_key_tmpl) handle2 = builder.keyset_handle() sign2 = handle2.primitive(jwt.JwtPublicKeySign) verify2 = handle2.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) builder.set_primary_key(newer_key_id) handle3 = builder.keyset_handle() sign3 = handle3.primitive(jwt.JwtPublicKeySign) verify3 = handle3.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) builder.disable_key(older_key_id) handle4 = builder.keyset_handle() sign4 = handle4.primitive(jwt.JwtPublicKeySign) verify4 = handle4.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) raw_jwt = jwt.new_raw_jwt(issuer='a', without_expiration=True) validator = jwt.new_validator( expected_issuer='a', allow_missing_expiration=True) self.assertNotEqual(older_key_id, newer_key_id) # 1 uses the older key. So 1, 2 and 3 can verify the signature, but not 4. compact1 = sign1.sign_and_encode(raw_jwt) self.assertEqual( verify1.verify_and_decode(compact1, validator).issuer(), 'a') self.assertEqual( verify2.verify_and_decode(compact1, validator).issuer(), 'a') self.assertEqual( verify3.verify_and_decode(compact1, validator).issuer(), 'a') with self.assertRaises(tink.TinkError): verify4.verify_and_decode(compact1, validator) # 2 uses the older key. So 1, 2 and 3 can verify the signature, but not 4. compact2 = sign2.sign_and_encode(raw_jwt) self.assertEqual( verify1.verify_and_decode(compact2, validator).issuer(), 'a') self.assertEqual( verify2.verify_and_decode(compact2, validator).issuer(), 'a') self.assertEqual( verify3.verify_and_decode(compact2, validator).issuer(), 'a') with self.assertRaises(tink.TinkError): verify4.verify_and_decode(compact2, validator) # 3 uses the newer key. So 2, 3 and 4 can verify the signature, but not 1. compact3 = sign3.sign_and_encode(raw_jwt) with self.assertRaises(tink.TinkError): verify1.verify_and_decode(compact3, validator) self.assertEqual( verify2.verify_and_decode(compact3, validator).issuer(), 'a') self.assertEqual( verify3.verify_and_decode(compact3, validator).issuer(), 'a') self.assertEqual( verify4.verify_and_decode(compact3, validator).issuer(), 'a') # 4 uses the newer key. So 2, 3 and 4 can verify the signature, but not 1. compact4 = sign4.sign_and_encode(raw_jwt) with self.assertRaises(tink.TinkError): verify1.verify_and_decode(compact4, validator) self.assertEqual( verify2.verify_and_decode(compact4, validator).issuer(), 'a') self.assertEqual( verify3.verify_and_decode(compact4, validator).issuer(), 'a') self.assertEqual( verify4.verify_and_decode(compact4, validator).issuer(), 'a') def test_only_tink_output_prefix_type_encodes_a_kid_header(self): handle = tink.new_keyset_handle(jwt.raw_jwt_es256_template()) sign = handle.primitive(jwt.JwtPublicKeySign) verify = handle.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) tink_handle = _change_output_prefix_to_tink(handle) tink_sign = tink_handle.primitive(jwt.JwtPublicKeySign) tink_verify = tink_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) raw_jwt = jwt.new_raw_jwt(issuer='issuer', without_expiration=True) token = sign.sign_and_encode(raw_jwt) token_with_kid = tink_sign.sign_and_encode(raw_jwt) _, header, _, _ = _jwt_format.split_signed_compact(token) self.assertNotIn('kid', _json_util.json_loads(header)) _, header_with_kid, _, _ = _jwt_format.split_signed_compact(token_with_kid) self.assertIn('kid', _json_util.json_loads(header_with_kid)) validator = jwt.new_validator( expected_issuer='issuer', allow_missing_expiration=True) verify.verify_and_decode(token, validator) tink_verify.verify_and_decode(token_with_kid, validator) other_handle = _change_key_id(tink_handle) other_verify = other_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) verify.verify_and_decode(token_with_kid, validator) # For output prefix type TINK, the kid header is required. with self.assertRaises(tink.TinkError): tink_verify.verify_and_decode(token, validator) # This should fail because value of the kid header is wrong. with self.assertRaises(tink.TinkError): other_verify.verify_and_decode(token_with_kid, validator) @parameterized.named_parameters([ ('JWT_ES256_RAW', jwt.raw_jwt_es256_template()), ('JWT_RS256_RAW', jwt.raw_jwt_rs256_2048_f4_template()), ('JWT_PS256_RAW', jwt.raw_jwt_ps256_3072_f4_template()), ]) def test_raw_key_with_custom_kid_header(self, template): # normal key with output prefix RAW handle = tink.new_keyset_handle(template) raw_jwt = jwt.new_raw_jwt(issuer='issuer', without_expiration=True) validator = jwt.new_validator( expected_issuer='issuer', allow_missing_expiration=True) sign = handle.primitive(jwt.JwtPublicKeySign) token = sign.sign_and_encode(raw_jwt) verify = handle.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) verify.verify_and_decode(token, validator) _, json_header, _, _ = _jwt_format.split_signed_compact(token) self.assertNotIn('kid', _json_util.json_loads(json_header)) # key with a custom_kid set custom_kid_handle = _set_custom_kid(handle, custom_kid=LONG_CUSTOM_KID) custom_kid_sign = custom_kid_handle.primitive(jwt.JwtPublicKeySign) token_with_kid = custom_kid_sign.sign_and_encode(raw_jwt) custom_kid_verify = custom_kid_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) custom_kid_verify.verify_and_decode(token_with_kid, validator) _, header_with_kid, _, _ = _jwt_format.split_signed_compact(token_with_kid) self.assertEqual(_json_util.json_loads(header_with_kid)['kid'], LONG_CUSTOM_KID) # The primitive with a custom_kid set accepts tokens without kid header. custom_kid_verify.verify_and_decode(token, validator) # The primitive without a custom_kid set ignores the kid header. verify.verify_and_decode(token_with_kid, validator) # key with a different custom_kid set other_handle = _set_custom_kid(handle, custom_kid='other kid') other_verify = other_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) # Fails because the kid value do not match. with self.assertRaises(tink.TinkError): other_verify.verify_and_decode(token_with_kid, validator) tink_handle = _change_output_prefix_to_tink(custom_kid_handle) tink_sign = tink_handle.primitive(jwt.JwtPublicKeySign) tink_verify = tink_handle.public_keyset_handle().primitive( jwt.JwtPublicKeyVerify) # Having custom_kid set with output prefix TINK is not allowed. with self.assertRaises(tink.TinkError): tink_sign.sign_and_encode(raw_jwt) with self.assertRaises(tink.TinkError): tink_verify.verify_and_decode(token, validator) with self.assertRaises(tink.TinkError): tink_verify.verify_and_decode(token_with_kid, validator) def test_legacy_template_fails(self): template = keyset_builder.legacy_template(jwt.jwt_es256_template()) builder = keyset_builder.new_keyset_builder() key_id = builder.add_new_key(template) builder.set_primary_key(key_id) handle = builder.keyset_handle() with self.assertRaises(tink.TinkError): handle.primitive(jwt.JwtPublicKeySign) with self.assertRaises(tink.TinkError): handle.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) def test_legacy_non_primary_key_fails(self): builder = keyset_builder.new_keyset_builder() old_template = keyset_builder.legacy_template(jwt.jwt_es256_template()) _ = builder.add_new_key(old_template) current_key_id = builder.add_new_key(jwt.jwt_es256_template()) builder.set_primary_key(current_key_id) handle = builder.keyset_handle() with self.assertRaises(tink.TinkError): handle.primitive(jwt.JwtPublicKeySign) with self.assertRaises(tink.TinkError): handle.public_keyset_handle().primitive(jwt.JwtPublicKeyVerify) def test_jwt_mac_from_keyset_without_primary_fails(self): builder = keyset_builder.new_keyset_builder() builder.add_new_key(jwt.jwt_es256_template()) with self.assertRaises(tink.TinkError): builder.keyset_handle()