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fix: calculation of session ticket age #5001

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fix: calculation of session ticket age #5001

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54631eb
fix: improper session ticket age calculation
Jan 3, 2025
a5e1181
fix: s2n_generate_ticket_lifetime function and tests
Jan 6, 2025
5d6cd41
Fix formats and add checks for keys in s2n_resume_test
Jan 7, 2025
91e6379
Roll back changes for s2n_resume_encrypt_session_ticket
Jan 7, 2025
5906150
refactor changes for format
Jan 7, 2025
0f47df4
Add config cleanup to fix memory issue
Jan 7, 2025
b13143e
add RESULT_ENSURE_REF check for input key
Jan 7, 2025
97f2ec1
fix the MIN comparison for min lifetime
Jan 7, 2025
bd9f4b2
address PR comments:
Jan 8, 2025
f59b6bf
refactor: record current time and retrieve key intro time for TLS1.3
Jan 10, 2025
0eb5525
make s2n_get_ticket_encrypt_decrypt_key not visible
Jan 11, 2025
b31f110
refactor: change the tls13_ticket_fields varaible names to ticket_fields
Jan 13, 2025
938eb66
fix: calculation of session ticket age for TLS1.2
Jan 13, 2025
1acad6b
refactor: prevent sending zero lifetime new session ticket for TLS1.2
Jan 9, 2025
6f2387a
refactor: prevent sending zero lifetime new session ticket for TLS1.3
Jan 13, 2025
ab28660
refactor: remove errno changes
Jan 13, 2025
7332abd
refactor: use s2n_find_ticket_key to get session ticket key
Jan 14, 2025
e80719b
fix: clang-format issue
Jan 14, 2025
15f08b2
fix: grep simple mistake error
Jan 14, 2025
edc611c
refactor: add key_intro_time to the ticket field
Jan 14, 2025
c6b7d78
refactor: improve generate lifetime ticket lifetime logic
Jan 14, 2025
e940156
address PR comments:
Jan 15, 2025
3e356d2
address PR comments:
Jan 21, 2025
1320b95
fix clang-format issue
Jan 21, 2025
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2 changes: 1 addition & 1 deletion tests/cbmc/sources/make_common_datastructures.c
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Original file line number Diff line number Diff line change
Expand Up @@ -801,7 +801,7 @@ void cbmc_populate_s2n_connection(struct s2n_connection *s2n_connection)
s2n_connection->verify_host_fn = malloc(sizeof(*(s2n_connection->verify_host_fn))); /* Function pointer. */
s2n_connection->data_for_verify_host = malloc(sizeof(*(s2n_connection->data_for_verify_host)));
cbmc_populate_s2n_blob(&(s2n_connection->client_ticket));
cbmc_populate_s2n_ticket_fields(&(s2n_connection->tls13_ticket_fields));
cbmc_populate_s2n_ticket_fields(&(s2n_connection->ticket_fields));
cbmc_populate_s2n_stuffer(&(s2n_connection->client_ticket_to_decrypt));
cbmc_populate_s2n_blob(&(s2n_connection->application_protocols_overridden));
cbmc_populate_s2n_blob(&(s2n_connection->cookie));
Expand Down
8 changes: 4 additions & 4 deletions tests/unit/s2n_client_psk_extension_test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -76,13 +76,13 @@ static int mock_time(void *data, uint64_t *nanoseconds)

static S2N_RESULT s2n_setup_encrypted_ticket(struct s2n_connection *conn, struct s2n_stuffer *output)
{
conn->tls13_ticket_fields = (struct s2n_ticket_fields){ 0 };
conn->ticket_fields = (struct s2n_ticket_fields){ 0 };
uint8_t test_secret_data[] = "test secret";
RESULT_GUARD_POSIX(s2n_alloc(&conn->tls13_ticket_fields.session_secret, sizeof(test_secret_data)));
RESULT_CHECKED_MEMCPY(conn->tls13_ticket_fields.session_secret.data, test_secret_data, sizeof(test_secret_data));
RESULT_GUARD_POSIX(s2n_alloc(&conn->ticket_fields.session_secret, sizeof(test_secret_data)));
RESULT_CHECKED_MEMCPY(conn->ticket_fields.session_secret.data, test_secret_data, sizeof(test_secret_data));

/* Create a valid resumption psk identity */
RESULT_GUARD(s2n_resume_encrypt_session_ticket(conn, output));
RESULT_GUARD(s2n_resume_encrypt_session_ticket(conn, output, NULL));
output->blob.size = s2n_stuffer_data_available(output);

return S2N_RESULT_OK;
Expand Down
6 changes: 3 additions & 3 deletions tests/unit/s2n_extended_master_secret_test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@ int main(int argc, char **argv)
EXPECT_SUCCESS(s2n_stuffer_init(&ticket, &ticket_blob));

/* Encrypt the ticket with EMS data */
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &ticket));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &ticket, NULL));

EXPECT_SUCCESS(s2n_connection_wipe(conn));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
Expand Down Expand Up @@ -89,7 +89,7 @@ int main(int argc, char **argv)
EXPECT_SUCCESS(s2n_stuffer_init(&ticket, &ticket_blob));

/* Encrypt the ticket without EMS data */
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &ticket));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &ticket, NULL));

EXPECT_SUCCESS(s2n_connection_wipe(conn));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
Expand Down Expand Up @@ -126,7 +126,7 @@ int main(int argc, char **argv)
EXPECT_SUCCESS(s2n_stuffer_init(&ticket, &ticket_blob));

/* Encrypt the ticket with EMS data */
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &ticket));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &ticket, NULL));

EXPECT_SUCCESS(s2n_connection_wipe(conn));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
Expand Down
8 changes: 4 additions & 4 deletions tests/unit/s2n_psk_offered_test.c
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Expand Up @@ -24,13 +24,13 @@

static S2N_RESULT s2n_setup_encrypted_ticket(struct s2n_connection *conn, struct s2n_stuffer *output)
{
conn->tls13_ticket_fields = (struct s2n_ticket_fields){ 0 };
conn->ticket_fields = (struct s2n_ticket_fields){ 0 };
uint8_t test_secret_data[] = "test secret";
RESULT_GUARD_POSIX(s2n_alloc(&conn->tls13_ticket_fields.session_secret, sizeof(test_secret_data)));
RESULT_CHECKED_MEMCPY(conn->tls13_ticket_fields.session_secret.data, test_secret_data, sizeof(test_secret_data));
RESULT_GUARD_POSIX(s2n_alloc(&conn->ticket_fields.session_secret, sizeof(test_secret_data)));
RESULT_CHECKED_MEMCPY(conn->ticket_fields.session_secret.data, test_secret_data, sizeof(test_secret_data));

/* Create a valid resumption psk identity */
RESULT_GUARD(s2n_resume_encrypt_session_ticket(conn, output));
RESULT_GUARD(s2n_resume_encrypt_session_ticket(conn, output, NULL));
output->blob.size = s2n_stuffer_data_available(output);

return S2N_RESULT_OK;
Expand Down
74 changes: 37 additions & 37 deletions tests/unit/s2n_resume_test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -176,7 +176,7 @@ int main(int argc, char **argv)
/* Set non-zero length secret */
uint8_t secret_size = 0;
EXPECT_SUCCESS(s2n_hmac_digest_size(conn->secure->cipher_suite->prf_alg, &secret_size));
EXPECT_SUCCESS(s2n_realloc(&conn->tls13_ticket_fields.session_secret, secret_size));
EXPECT_SUCCESS(s2n_realloc(&conn->ticket_fields.session_secret, secret_size));

/* Result matches constant */
size_t actual_size = 0;
Expand Down Expand Up @@ -206,7 +206,7 @@ int main(int argc, char **argv)
/* Set non-zero length secret */
uint8_t secret_size = 0;
EXPECT_SUCCESS(s2n_hmac_digest_size(conn->secure->cipher_suite->prf_alg, &secret_size));
EXPECT_SUCCESS(s2n_realloc(&conn->tls13_ticket_fields.session_secret, secret_size));
EXPECT_SUCCESS(s2n_realloc(&conn->ticket_fields.session_secret, secret_size));

/* Result matches constant */
size_t actual_size = 0;
Expand All @@ -232,7 +232,7 @@ int main(int argc, char **argv)
/* Set non-zero length secret */
uint8_t secret_size = 0;
EXPECT_SUCCESS(s2n_hmac_digest_size(conn->secure->cipher_suite->prf_alg, &secret_size));
EXPECT_SUCCESS(s2n_alloc(&conn->tls13_ticket_fields.session_secret, secret_size));
EXPECT_SUCCESS(s2n_alloc(&conn->ticket_fields.session_secret, secret_size));

/* Result matches constants */
size_t actual_size = 0;
Expand Down Expand Up @@ -260,7 +260,7 @@ int main(int argc, char **argv)
/* Set non-zero length secret */
uint8_t secret_size = 0;
EXPECT_SUCCESS(s2n_hmac_digest_size(conn->secure->cipher_suite->prf_alg, &secret_size));
EXPECT_SUCCESS(s2n_alloc(&conn->tls13_ticket_fields.session_secret, secret_size));
EXPECT_SUCCESS(s2n_alloc(&conn->ticket_fields.session_secret, secret_size));

/* Set early data fields */
const uint8_t data[] = "test data";
Expand Down Expand Up @@ -324,7 +324,7 @@ int main(int argc, char **argv)
/* Set non-zero length secret */
uint8_t secret_size = 0;
EXPECT_SUCCESS(s2n_hmac_digest_size(conn->secure->cipher_suite->prf_alg, &secret_size));
EXPECT_SUCCESS(s2n_alloc(&conn->tls13_ticket_fields.session_secret, secret_size));
EXPECT_SUCCESS(s2n_alloc(&conn->ticket_fields.session_secret, secret_size));
int session_length = s2n_connection_get_session_length(conn);
EXPECT_NOT_EQUAL(session_length, 0);

Expand Down Expand Up @@ -473,8 +473,8 @@ int main(int argc, char **argv)
DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));

conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->ticket_fields.session_secret));

EXPECT_OK(s2n_tls13_serialize_resumption_state(conn, &output));

Expand All @@ -496,11 +496,11 @@ int main(int argc, char **argv)

uint32_t ticket_age_add = 0;
EXPECT_SUCCESS(s2n_stuffer_read_uint32(&output, &ticket_age_add));
EXPECT_EQUAL(ticket_age_add, conn->tls13_ticket_fields.ticket_age_add);
EXPECT_EQUAL(ticket_age_add, conn->ticket_fields.ticket_age_add);

uint8_t secret_len = 0;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&output, &secret_len));
EXPECT_EQUAL(secret_len, conn->tls13_ticket_fields.session_secret.size);
EXPECT_EQUAL(secret_len, conn->ticket_fields.session_secret.size);

uint8_t session_secret[S2N_TLS_SECRET_LEN] = { 0 };
EXPECT_SUCCESS(s2n_stuffer_read_bytes(&output, session_secret, secret_len));
Expand Down Expand Up @@ -531,8 +531,8 @@ int main(int argc, char **argv)
DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));

conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->ticket_fields.session_secret));

/* New expiration time */
{
Expand Down Expand Up @@ -612,8 +612,8 @@ int main(int argc, char **argv)
DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));

conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->ticket_fields.session_secret));

/* Write ticket without early data. Save size for comparison. */
EXPECT_SUCCESS(s2n_connection_set_server_max_early_data_size(conn, 0));
Expand Down Expand Up @@ -687,10 +687,10 @@ int main(int argc, char **argv)
DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));

conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->ticket_fields.session_secret));

EXPECT_SUCCESS(s2n_realloc(&conn->tls13_ticket_fields.session_secret, test_cases[i].secret_size));
EXPECT_SUCCESS(s2n_realloc(&conn->ticket_fields.session_secret, test_cases[i].secret_size));
if (test_cases[i].success) {
EXPECT_OK(s2n_tls13_serialize_resumption_state(conn, &output));
} else {
Expand Down Expand Up @@ -1137,8 +1137,8 @@ int main(int argc, char **argv)
DEFER_CLEANUP(struct s2n_stuffer stuffer = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));

conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = TICKET_AGE_ADD };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = TICKET_AGE_ADD };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->ticket_fields.session_secret));

/* Initialize client ticket */
uint8_t client_ticket[] = { CLIENT_TICKET };
Expand Down Expand Up @@ -1194,8 +1194,8 @@ int main(int argc, char **argv)
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));

/* Initialize client ticket */
conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = TICKET_AGE_ADD };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = TICKET_AGE_ADD };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->ticket_fields.session_secret));
uint8_t client_ticket[] = { CLIENT_TICKET };
EXPECT_SUCCESS(s2n_realloc(&conn->client_ticket, sizeof(client_ticket)));
EXPECT_MEMCPY_SUCCESS(conn->client_ticket.data, client_ticket, sizeof(client_ticket));
Expand Down Expand Up @@ -1298,7 +1298,7 @@ int main(int argc, char **argv)
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(conn);
EXPECT_ERROR_WITH_ERRNO(s2n_resume_encrypt_session_ticket(conn, &conn->client_ticket_to_decrypt),
EXPECT_ERROR_WITH_ERRNO(s2n_resume_encrypt_session_ticket(conn, &conn->client_ticket_to_decrypt, NULL),
S2N_ERR_NO_TICKET_ENCRYPT_DECRYPT_KEY);
}

Expand All @@ -1315,7 +1315,7 @@ int main(int argc, char **argv)
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));

struct s2n_stuffer output = { 0 };
EXPECT_ERROR_WITH_ERRNO(s2n_resume_encrypt_session_ticket(conn, &output), S2N_ERR_STUFFER_IS_FULL);
EXPECT_ERROR_WITH_ERRNO(s2n_resume_encrypt_session_ticket(conn, &output, NULL), S2N_ERR_STUFFER_IS_FULL);
}

/* Check encrypted data can be decrypted correctly for TLS12 */
Expand All @@ -1337,7 +1337,7 @@ int main(int argc, char **argv)
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&secret_stuffer, test_master_secret.data, S2N_TLS_SECRET_LEN));
conn->secure->cipher_suite = &s2n_ecdhe_ecdsa_with_aes_128_gcm_sha256;

EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &conn->client_ticket_to_decrypt));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &conn->client_ticket_to_decrypt, NULL));
EXPECT_NOT_EQUAL(s2n_stuffer_data_available(&conn->client_ticket_to_decrypt), 0);

/* Wiping the master secret to prove that the decryption function actually writes the master secret */
Expand Down Expand Up @@ -1368,13 +1368,13 @@ int main(int argc, char **argv)

DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));
conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_session_secret, &conn->ticket_fields.session_secret));

/* This secret is smaller than the maximum secret length */
EXPECT_TRUE(conn->tls13_ticket_fields.session_secret.size < S2N_TLS_SECRET_LEN);
EXPECT_TRUE(conn->ticket_fields.session_secret.size < S2N_TLS_SECRET_LEN);

EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &output));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &output, NULL));
EXPECT_OK(s2n_resume_decrypt_session_ticket(conn, &output));

EXPECT_EQUAL(s2n_stuffer_data_available(&output), 0);
Expand Down Expand Up @@ -1404,13 +1404,13 @@ int main(int argc, char **argv)

DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));
conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_master_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_master_secret, &conn->ticket_fields.session_secret));

/* This secret is equal to the maximum secret length */
EXPECT_EQUAL(conn->tls13_ticket_fields.session_secret.size, S2N_TLS_SECRET_LEN);
EXPECT_EQUAL(conn->ticket_fields.session_secret.size, S2N_TLS_SECRET_LEN);

EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &output));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &output, NULL));
EXPECT_OK(s2n_resume_decrypt_session_ticket(conn, &output));

EXPECT_EQUAL(s2n_stuffer_data_available(&output), 0);
Expand Down Expand Up @@ -1438,7 +1438,7 @@ int main(int argc, char **argv)
conn->actual_protocol_version = S2N_TLS12;
conn->handshake.handshake_type = NEGOTIATED;

EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &conn->client_ticket_to_decrypt));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &conn->client_ticket_to_decrypt, NULL));
EXPECT_NOT_EQUAL(s2n_stuffer_data_available(&conn->client_ticket_to_decrypt), 0);

/* Modify the version number of the ticket */
Expand Down Expand Up @@ -1470,7 +1470,7 @@ int main(int argc, char **argv)

DEFER_CLEANUP(struct s2n_stuffer valid_ticket = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&valid_ticket, 0));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &valid_ticket));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &valid_ticket, NULL));
uint32_t ticket_size = s2n_stuffer_data_available(&valid_ticket);

/* Copy ticket so that we don't modify the original ticket */
Expand Down Expand Up @@ -1521,7 +1521,7 @@ int main(int argc, char **argv)
DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));

EXPECT_ERROR_WITH_ERRNO(s2n_resume_encrypt_session_ticket(conn, &output), S2N_ERR_KEY_CHECK);
EXPECT_ERROR_WITH_ERRNO(s2n_resume_encrypt_session_ticket(conn, &output, NULL), S2N_ERR_KEY_CHECK);
};

/* Check session ticket is correct when using early data with TLS1.3. */
Expand All @@ -1545,10 +1545,10 @@ int main(int argc, char **argv)

DEFER_CLEANUP(struct s2n_stuffer output = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&output, 0));
conn->tls13_ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_master_secret, &conn->tls13_ticket_fields.session_secret));
conn->ticket_fields = (struct s2n_ticket_fields){ .ticket_age_add = 1 };
EXPECT_SUCCESS(s2n_dup(&test_master_secret, &conn->ticket_fields.session_secret));

EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &output));
EXPECT_OK(s2n_resume_encrypt_session_ticket(conn, &output, NULL));
EXPECT_OK(s2n_resume_decrypt_session_ticket(conn, &output));

EXPECT_EQUAL(s2n_stuffer_data_available(&output), 0);
Expand Down
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