Use nid_list table to lookup curve IDs.

Reviewed-by: NMatt Caswell <matt@openssl.org>

ssl/t1_lib.c

@@ -341,67 +341,12 @@ int tls1_ec_curve_id2nid(int curve_id)
 
 int tls1_ec_nid2curve_id(int nid)
 {
-    /* ECC curves from RFC 4492 and RFC 7027 */
-    switch (nid) {
-    case NID_sect163k1:        /* sect163k1 (1) */
-        return 1;
-    case NID_sect163r1:        /* sect163r1 (2) */
-        return 2;
-    case NID_sect163r2:        /* sect163r2 (3) */
-        return 3;
-    case NID_sect193r1:        /* sect193r1 (4) */
-        return 4;
-    case NID_sect193r2:        /* sect193r2 (5) */
-        return 5;
-    case NID_sect233k1:        /* sect233k1 (6) */
-        return 6;
-    case NID_sect233r1:        /* sect233r1 (7) */
-        return 7;
-    case NID_sect239k1:        /* sect239k1 (8) */
-        return 8;
-    case NID_sect283k1:        /* sect283k1 (9) */
-        return 9;
-    case NID_sect283r1:        /* sect283r1 (10) */
-        return 10;
-    case NID_sect409k1:        /* sect409k1 (11) */
-        return 11;
-    case NID_sect409r1:        /* sect409r1 (12) */
-        return 12;
-    case NID_sect571k1:        /* sect571k1 (13) */
-        return 13;
-    case NID_sect571r1:        /* sect571r1 (14) */
-        return 14;
-    case NID_secp160k1:        /* secp160k1 (15) */
-        return 15;
-    case NID_secp160r1:        /* secp160r1 (16) */
-        return 16;
-    case NID_secp160r2:        /* secp160r2 (17) */
-        return 17;
-    case NID_secp192k1:        /* secp192k1 (18) */
-        return 18;
-    case NID_X9_62_prime192v1: /* secp192r1 (19) */
-        return 19;
-    case NID_secp224k1:        /* secp224k1 (20) */
-        return 20;
-    case NID_secp224r1:        /* secp224r1 (21) */
-        return 21;
-    case NID_secp256k1:        /* secp256k1 (22) */
-        return 22;
-    case NID_X9_62_prime256v1: /* secp256r1 (23) */
-        return 23;
-    case NID_secp384r1:        /* secp384r1 (24) */
-        return 24;
-    case NID_secp521r1:        /* secp521r1 (25) */
-        return 25;
-    case NID_brainpoolP256r1:  /* brainpoolP256r1 (26) */
-        return 26;
-    case NID_brainpoolP384r1:  /* brainpoolP384r1 (27) */
-        return 27;
-    case NID_brainpoolP512r1:  /* brainpool512r1 (28) */
-        return 28;
-    default:
-        return 0;
+    size_t i;
+    for (i = 0; i < OSSL_NELEM(nid_list); i++) {
+        if (nid_list[i].nid == nid)
+            return i + 1;
     }
+    return 0;
 }
 
 /*