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Share the spare ephemeral key size and note the key stays in RAM until consumed

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This commit is contained in:
J. Nick Koston
2026-09-07 17:02:04 +02:00
parent 5cc758dea3
commit 6aa6b682df
3 changed files with 13 additions and 13 deletions
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tests/components/noise/test_noise_handshake.cpp
+7 -7
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@@ -161,7 +161,7 @@ TEST(NoiseResponderHandshakeTest, FullHandshakeAndTransportRoundTrip) {
// responder_e receives the ephemeral public key the responder put on the
// wire (the clear text start of its message, taken before the initiator
// consumes the buffer in place)
static void run_handshake(NoiseResponderHandshake &responder, uint8_t responder_e[32]) {
static void run_handshake(NoiseResponderHandshake &responder, uint8_t responder_e[SPARE_EPHEMERAL_KEY_SIZE]) {
const psk_t psk = make_psk(7);
ASSERT_EQ(responder.init(ctx_for(psk), PROLOGUE, sizeof(PROLOGUE)), 0);
Initiator initiator(psk, PROLOGUE, sizeof(PROLOGUE));
@@ -170,8 +170,8 @@ static void run_handshake(NoiseResponderHandshake &responder, uint8_t responder_
ASSERT_EQ(responder.read_message(msg, msg_len), 0);
size_t reply_len = 0;
ASSERT_EQ(responder.write_message(msg, sizeof(msg), reply_len), 0);
ASSERT_GE(reply_len, 32u);
std::memcpy(responder_e, msg, 32);
ASSERT_GE(reply_len, SPARE_EPHEMERAL_KEY_SIZE);
std::memcpy(responder_e, msg, SPARE_EPHEMERAL_KEY_SIZE);
ASSERT_EQ(initiator.read_message(msg, reply_len), 0);
ASSERT_EQ(responder.action(), Action::ACTION_SPLIT);
}
@@ -179,7 +179,7 @@ static void run_handshake(NoiseResponderHandshake &responder, uint8_t responder_
TEST(SpareEphemeralTest, EmptySlotLeavesHandshakeToGenerate) {
ASSERT_FALSE(has_spare_ephemeral());
NoiseResponderHandshake responder;
uint8_t responder_e[32];
uint8_t responder_e[SPARE_EPHEMERAL_KEY_SIZE];
run_handshake(responder, responder_e);
EXPECT_FALSE(has_spare_ephemeral());
}
@@ -209,11 +209,11 @@ TEST(SpareEphemeralTest, ConsumeHandsTheKeyToANewState) {
TEST(SpareEphemeralTest, SlotKeyIsOnTheWireAndConsumedOnce) {
prepare_spare_ephemeral();
ASSERT_TRUE(has_spare_ephemeral());
uint8_t expected_pub[32];
std::memcpy(expected_pub, spare_ephemeral + 32, sizeof(expected_pub));
uint8_t expected_pub[SPARE_EPHEMERAL_KEY_SIZE];
std::memcpy(expected_pub, spare_ephemeral + SPARE_EPHEMERAL_KEY_SIZE, sizeof(expected_pub));
NoiseResponderHandshake first;
uint8_t responder_e[32];
uint8_t responder_e[SPARE_EPHEMERAL_KEY_SIZE];
run_handshake(first, responder_e);
// The spare, not a generated key, went out; and it went out once
EXPECT_EQ(std::memcmp(responder_e, expected_pub, sizeof(expected_pub)), 0);