Use indexed ECC info table

Rework `stse_ecc_info_table` to use explicit indexing via
`stse_ecc_key_type_t` values instead of relying on positional ordering.
This improves readability, maintains a direct mapping between key types
and table entries, and prevents potential issues caused by
configuration-dependent ordering.

Author: parmi93

core/stse_generic_typedef.c

@@ -26,7 +26,7 @@ const stse_ecc_info_t stse_ecc_info_table[] =
 #else
     {
 #ifdef STSE_CONF_ECC_NIST_P_256
-        {/* NIST P 256 */
+        [STSE_ECC_KT_NIST_P_256] = {/* NIST P 256 */
          .curve_id_total_length = (STSE_NIST_P_256_ID_VALUE_SIZE + STSE_ECC_CURVE_ID_LENGTH_SIZE),
          .curve_id = {{UI16_B1(STSE_NIST_P_256_ID_VALUE_SIZE), UI16_B0(STSE_NIST_P_256_ID_VALUE_SIZE)},
                       STSE_NIST_P_256_ID_VALUE},
@@ -37,7 +37,7 @@ const stse_ecc_info_t stse_ecc_info_table[] =
          .signature_size = (STSE_NIST_P_256_SIGNATURE_R_VALUE_SIZE + STSE_NIST_P_256_SIGNATURE_S_VALUE_SIZE)},
 #endif
 #ifdef STSE_CONF_ECC_NIST_P_384
-        {/* NIST P_384 */
+        [STSE_ECC_KT_NIST_P_384] = {/* NIST P_384 */
          .curve_id_total_length = (STSE_NIST_P_384_ID_VALUE_SIZE + STSE_ECC_CURVE_ID_LENGTH_SIZE),
          .curve_id = {{UI16_B1(STSE_NIST_P_384_ID_VALUE_SIZE), UI16_B0(STSE_NIST_P_384_ID_VALUE_SIZE)},
                       STSE_NIST_P_384_ID_VALUE},
@@ -48,7 +48,7 @@ const stse_ecc_info_t stse_ecc_info_table[] =
          .signature_size = (STSE_NIST_P_384_SIGNATURE_R_VALUE_SIZE + STSE_NIST_P_384_SIGNATURE_S_VALUE_SIZE)},
 #endif
 #ifdef STSE_CONF_ECC_NIST_P_521
-        {/* NIST P 521 */
+        [STSE_ECC_KT_NIST_P_521] = {/* NIST P 521 */
          .curve_id_total_length = (STSE_NIST_P_521_ID_VALUE_SIZE + STSE_ECC_CURVE_ID_LENGTH_SIZE),
          .curve_id = {{UI16_B1(STSE_NIST_P_521_ID_VALUE_SIZE), UI16_B0(STSE_NIST_P_521_ID_VALUE_SIZE)},
                       STSE_NIST_P_521_ID_VALUE},
@@ -59,7 +59,7 @@ const stse_ecc_info_t stse_ecc_info_table[] =
          .signature_size = (STSE_NIST_P_521_SIGNATURE_R_VALUE_SIZE + STSE_NIST_P_521_SIGNATURE_S_VALUE_SIZE)},
 #endif
 #ifdef STSE_CONF_ECC_BRAINPOOL_P_256
-        {/* BRAINPOOL P 256 */
+        [STSE_ECC_KT_BP_P_256] = {/* BRAINPOOL P 256 */
          .curve_id_total_length = (STSE_BRAINPOOL_P_256_ID_VALUE_SIZE + STSE_ECC_CURVE_ID_LENGTH_SIZE),
          .curve_id = {{UI16_B1(STSE_BRAINPOOL_P_256_ID_VALUE_SIZE), UI16_B0(STSE_BRAINPOOL_P_256_ID_VALUE_SIZE)},
                       STSE_BRAINPOOL_P_256_ID_VALUE},
@@ -70,7 +70,7 @@ const stse_ecc_info_t stse_ecc_info_table[] =
          .signature_size = (STSE_BRAINPOOL_P_256_SIGNATURE_R_VALUE_SIZE + STSE_BRAINPOOL_P_256_SIGNATURE_S_VALUE_SIZE)},
 #endif
 #ifdef STSE_CONF_ECC_BRAINPOOL_P_384
-        {/* BRAINPOOL P 384 */
+        [STSE_ECC_KT_BP_P_384] = {/* BRAINPOOL P 384 */
          .curve_id_total_length = (STSE_BRAINPOOL_P_384_ID_VALUE_SIZE + STSE_ECC_CURVE_ID_LENGTH_SIZE),
          .curve_id = {{UI16_B1(STSE_BRAINPOOL_P_384_ID_VALUE_SIZE), UI16_B0(STSE_BRAINPOOL_P_384_ID_VALUE_SIZE)},
                       STSE_BRAINPOOL_P_384_ID_VALUE},
@@ -81,7 +81,7 @@ const stse_ecc_info_t stse_ecc_info_table[] =
          .signature_size = (STSE_BRAINPOOL_P_384_SIGNATURE_R_VALUE_SIZE + STSE_BRAINPOOL_P_384_SIGNATURE_S_VALUE_SIZE)},
 #endif
 #ifdef STSE_CONF_ECC_BRAINPOOL_P_512
-        {/* BRAINPOOL P 512 */
+        [STSE_ECC_KT_BP_P_512] = {/* BRAINPOOL P 512 */
          .curve_id_total_length = (STSE_BRAINPOOL_P_512_ID_VALUE_SIZE + STSE_ECC_CURVE_ID_LENGTH_SIZE),
          .curve_id = {{UI16_B1(STSE_BRAINPOOL_P_512_ID_VALUE_SIZE), UI16_B0(STSE_BRAINPOOL_P_512_ID_VALUE_SIZE)},
                       STSE_BRAINPOOL_P_512_ID_VALUE},
@@ -92,7 +92,7 @@ const stse_ecc_info_t stse_ecc_info_table[] =
          .signature_size = (STSE_BRAINPOOL_P_512_SIGNATURE_R_VALUE_SIZE + STSE_BRAINPOOL_P_512_SIGNATURE_S_VALUE_SIZE)},
 #endif
 #ifdef STSE_CONF_ECC_CURVE_25519
-        {/* X25519 */
+        [STSE_ECC_KT_CURVE25519] = {/* X25519 */
          .curve_id_total_length = (STSE_X25519_ID_VALUE_SIZE + STSE_ECC_CURVE_ID_LENGTH_SIZE),
          .curve_id = {{UI16_B1(STSE_X25519_ID_VALUE_SIZE), UI16_B0(STSE_X25519_ID_VALUE_SIZE)},
                       STSE_X25519_ID_VALUE},
@@ -103,7 +103,7 @@ const stse_ecc_info_t stse_ecc_info_table[] =
          .signature_size = 0},
 #endif
 #ifdef STSE_CONF_ECC_EDWARD_25519
-        {/* ED25519 */
+        [STSE_ECC_KT_ED25519] = {/* ED25519 */
          .curve_id_total_length = (STSE_ED25519_ID_VALUE_SIZE + STSE_ECC_CURVE_ID_LENGTH_SIZE),
          .curve_id = {{UI16_B1(STSE_ED25519_ID_VALUE_SIZE), UI16_B0(STSE_ED25519_ID_VALUE_SIZE)},
                       STSE_ED25519_ID_VALUE},

core/stse_generic_typedef.h

@@ -71,6 +71,8 @@
 /*!
  * \enum stse_ecc_key_type_t
  * \brief STSE ECC key type
+ *
+ * \note Do not assign any value to these enumerators, as they are used as indices in the `stse_ecc_info_table` array.
  */
 typedef enum stse_ecc_key_type_t {
 #ifdef STSE_CONF_ECC_NIST_P_256