tls: code shrink

function                                             old     new   delta
tls_handshake                                       1643    1619     -24

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 4 insertions, 8 deletions

diff --git a/networking/tls.c b/networking/tls.c
index 7cd6a61ba..0f637a3d7 100644
--- a/networking/tls.c
+++ b/networking/tls.c
@@ -1115,8 +1115,6 @@ static void find_key_in_der_cert(tls_state_t *tls, uint8_t *der, int len)
  * We need Certificate.tbsCertificate.subjectPublicKeyInfo.publicKey
  */
         uint8_t *end = der + len;
-        uint8_t tag_class, pc, tag_number;
-        int version_present;
 
         /* enter "Certificate" item: [der, end) will be only Cert */
         der = enter_der_item(der, &end);
@@ -1133,13 +1131,11 @@ static void find_key_in_der_cert(tls_state_t *tls, uint8_t *der, int len)
          * (constructed), and a tag number of 0 (see ITU-T X.690 sections 8.1.2
          * and 8.14).
          */
-        tag_class = der[0] >> 6; /* bits 8-7 */
-        pc = (der[0] & 32) >> 5; /* bit 6 */
-        tag_number = der[0] & 31; /* bits 5-1 */
-        version_present = tag_class == 2 && pc == 1 && tag_number == 0;
-        if (version_present) {
+        /* bits 7-6: 10 */
+        /* bit 5: 1 */
+        /* bits 4-0: 00000 */
+        if (der[0] == 0xa0)
                 der = skip_der_item(der, end); /* version */
-        }
 
         /* skip up to subjectPublicKeyInfo */
         der = skip_der_item(der, end); /* serialNumber */