Add type specific ECC public key encode/deocde handling ECC X9.63 public key format

Author: ColtonWilley

src/wp_ecc_kmgmt.c

@@ -1995,6 +1995,28 @@ static int wp_ecc_decode_params(wp_Ecc* ecc, unsigned char* data, word32 len)
     return ok;
 }
 
+static int wp_ecc_decode_x963_pub(wp_Ecc* ecc, unsigned char* data, word32 len)
+{
+    int ok = 1;
+    int rc;
+
+    rc = wc_ecc_import_x963((const byte *)data, len, &ecc->key);
+    if (rc != 0) {
+        ok = 0;
+    }
+    if (ok) {
+        ecc->curveId = ecc->key.dp->id;
+        ecc->hasPub = 1;
+        /* Needs curveId set. */
+        if (!wp_ecc_set_bits(ecc)) {
+            ok = 0;
+        }
+    }
+
+    WOLFPROV_LEAVE(WP_LOG_PK, __FILE__ ":" WOLFPROV_STRINGIZE(__LINE__), ok);
+    return ok;
+}
+
 /**
  * Decode the SubjectPublicInfo DER encoded ECC key into the ECC key object.
  *
@@ -2160,6 +2182,12 @@ static int wp_ecc_decode(wp_EccEncDecCtx* ctx, OSSL_CORE_BIO *cBio,
                 decoded = 0;
             }
         }
+        else if (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) {
+            if (!wp_ecc_decode_x963_pub(ecc, data, len)) {
+                ok = 0;
+                decoded = 0;
+            }
+        }
         else {
             if (!wp_ecc_decode_params(ecc, data, len)) {
                 ok = 0;
@@ -2253,6 +2281,61 @@ static int wp_ecc_encode_params(const wp_Ecc *ecc, unsigned char* keyData,
     return ok;
 }
 
+/**
+ * Get the public key encoding size.
+ *
+ * @param [in]  ecc     ECC key object.
+ * @param [out] keyLen  Length of encoding in bytes.
+ * @return  1 on success.
+ * @return  0 on failure.
+ */
+static int wp_ecc_encode_pub_size(const wp_Ecc *ecc, size_t* keyLen)
+{
+    int ok = 1;
+    int rc;
+    word32 len;
+
+    rc = wc_ecc_export_x963_ex((ecc_key*)&ecc->key, NULL, &len, 0);
+    if (rc != LENGTH_ONLY_E) {
+        ok = 0;
+    }
+    if (ok) {
+        *keyLen = len;
+    }
+
+    WOLFPROV_LEAVE(WP_LOG_PK, __FILE__ ":" WOLFPROV_STRINGIZE(__LINE__), ok);
+    return ok;
+}
+
+/**
+ * Encode the ECC public key.
+ *
+ * @param [in]      ecc      ECC key object.
+ * @param [out]     keyData  Buffer to hold encoded data.
+ * @param [in, out] keyLen   On in, length of buffer in bytes.
+ *                           On out, length of encoding in bytes.
+ * @return  1 on success.
+ * @return  0 on failure.
+ */
+static int wp_ecc_encode_pub(const wp_Ecc *ecc, unsigned char* keyData,
+    size_t* keyLen)
+{
+    int ok = 1;
+    int rc;
+    word32 len = (word32)*keyLen;
+
+    rc = wc_ecc_export_x963_ex((ecc_key*)&ecc->key, keyData, &len, 0);
+    if (rc != 0) {
+        ok = 0;
+    }
+    if (ok) {
+        *keyLen = len;
+    }
+
+    WOLFPROV_LEAVE(WP_LOG_PK, __FILE__ ":" WOLFPROV_STRINGIZE(__LINE__), ok);
+    return ok;
+}
+
 /**
  * Get the PKCS#8 encoding size for the key.
  *
@@ -2548,6 +2631,11 @@ static int wp_ecc_encode(wp_EccEncDecCtx* ctx, OSSL_CORE_BIO *cBio,
                 ok = 0;
             }
         }
+        else if (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) {
+            if (!wp_ecc_encode_pub_size(key, &derLen)) {
+                ok = 0;
+            }
+        }
         else if (selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) {
             if (!wp_ecc_encode_params_size(key, &derLen)) {
                 ok = 0;
@@ -2591,6 +2679,12 @@ static int wp_ecc_encode(wp_EccEncDecCtx* ctx, OSSL_CORE_BIO *cBio,
                 ok = 0;
             }
         }
+        else if (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) {
+            pemType = PUBLICKEY_TYPE;
+            if (!wp_ecc_encode_pub(key, derData, &derLen)) {
+                ok = 0;
+            }
+        }
         else if (selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) {
             pemType = DH_PARAM_TYPE;
             if (!wp_ecc_encode_params(key, derData, &derLen)) {