Set service indicator for TLS 1.3 KDF.

Change-Id: Ia6fffb4c1fbe9edc62a4c22b45408e41ac6ae086
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/67547
Reviewed-by: David Benjamin <davidben@google.com>
Auto-Submit: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>

2 files changed, 22 insertions, 0 deletions

diff --git a/crypto/fipsmodule/service_indicator/service_indicator_test.cc b/crypto/fipsmodule/service_indicator/service_indicator_test.cc
index a3f06eb..e7221fa 100644
--- a/crypto/fipsmodule/service_indicator/service_indicator_test.cc
+++ b/crypto/fipsmodule/service_indicator/service_indicator_test.cc
@@ -1800,6 +1800,21 @@ TEST_P(KDF_ServiceIndicatorTest, TLSKDF) {
   EXPECT_EQ(approved, test.expect_approved);
 }
 
+TEST_P(KDF_ServiceIndicatorTest, TLS13KDF) {
+  const KDFTestVector &test = GetParam();
+
+  FIPSStatus approved = FIPSStatus::NOT_APPROVED;
+
+  uint8_t output[32];
+  ASSERT_TRUE(CALL_SERVICE_AND_CHECK_APPROVED(
+      approved, CRYPTO_tls13_hkdf_expand_label(
+                    output, sizeof(output), test.func(), kTLSSecret,
+                    sizeof(kTLSSecret), /*label=*/kTLSSeed1, sizeof(kTLSSeed1),
+                    /*hash=*/kTLSSeed2, sizeof(kTLSSeed2))));
+
+  EXPECT_EQ(approved, test.expect_approved);
+}
+
 TEST(ServiceIndicatorTest, CMAC) {
   FIPSStatus approved = FIPSStatus::NOT_APPROVED;
 
diff --git a/crypto/fipsmodule/tls/kdf.c b/crypto/fipsmodule/tls/kdf.c
index c4f4976..7a7d12d 100644
--- a/crypto/fipsmodule/tls/kdf.c
+++ b/crypto/fipsmodule/tls/kdf.c
@@ -189,6 +189,7 @@ int CRYPTO_tls13_hkdf_expand_label(uint8_t *out, size_t out_len,
   uint8_t *hkdf_label = NULL;
   size_t hkdf_label_len;
 
+  FIPS_service_indicator_lock_state();
   CBB_zero(&cbb);
   if (!CBB_init(&cbb, 2 + 1 + sizeof(kProtocolLabel) - 1 + label_len + 1 +
                           hash_len) ||
@@ -200,12 +201,18 @@ int CRYPTO_tls13_hkdf_expand_label(uint8_t *out, size_t out_len,
       !CBB_add_bytes(&child, hash, hash_len) ||
       !CBB_finish(&cbb, &hkdf_label, &hkdf_label_len)) {
     CBB_cleanup(&cbb);
+    FIPS_service_indicator_unlock_state();
     return 0;
   }
 
   const int ret = HKDF_expand(out, out_len, digest, secret, secret_len,
                               hkdf_label, hkdf_label_len);
   OPENSSL_free(hkdf_label);
+
+  FIPS_service_indicator_unlock_state();
+  if (ret) {
+    TLSKDF_verify_service_indicator(digest);
+  }
   return ret;
 }