diff --git a/ndn-cpp/c/key.h b/ndn-cpp/c/key.h
index 814c200..a933489 100644
--- a/ndn-cpp/c/key.h
+++ b/ndn-cpp/c/key.h
@@ -31,7 +31,7 @@
  */
 struct ndn_KeyLocator {
   ndn_KeyLocatorType type;     /**< -1 for none */
-  uint8_t *keyData;            /**< A pointer to a pre-allocated buffer for the key data as follows:
+  struct ndn_Blob keyData;            /**< A Blob whose value is a pointer to a pre-allocated buffer for the key data as follows:
     *   If type is ndn_KeyLocatorType_KEY, the key data.
     *   If type is ndn_KeyLocatorType_CERTIFICATE, the certificate data. 
     *   If type is ndn_KeyLocatorType_KEYNAME and keyNameType is ndn_KeyNameType_PUBLISHER_PUBLIC_KEY_DIGEST, the publisher public key digest. 
@@ -39,7 +39,6 @@
     *   If type is ndn_KeyLocatorType_KEYNAME and keyNameType is ndn_KeyNameType_PUBLISHER_ISSUER_KEY_DIGEST, the publisher issuer key digest. 
     *   If type is ndn_KeyLocatorType_KEYNAME and keyNameType is ndn_KeyNameType_PUBLISHER_ISSUER_CERTIFICATE_DIGEST, the publisher issuer certificate digest. 
     */
-  size_t keyDataLength;        /**< The length of keyData. */
   struct ndn_Name keyName;     /**< The key name (only used if type is ndn_KeyLocatorType_KEYNAME.) */
   ndn_KeyNameType keyNameType; /**< The type of data for keyName, -1 for none. (only used if type is ndn_KeyLocatorType_KEYNAME.) */
 };
@@ -53,8 +52,7 @@
 static inline void ndn_KeyLocator_initialize
   (struct ndn_KeyLocator *self, struct ndn_NameComponent *keyNameComponents, size_t maxKeyNameComponents) {
   self->type = (ndn_KeyLocatorType)-1;
-  self->keyData = 0;
-  self->keyDataLength = 0;
+  ndn_Blob_initialize(&self->keyData, 0, 0);
   ndn_Name_initialize(&self->keyName, keyNameComponents, maxKeyNameComponents);
   self->keyNameType = (ndn_KeyNameType)-1;
 }