encoding: remove duplicate buf() and get() methods from Buffer class

Change-Id: If885d4199d6c9df9b9b46664c3641c9a14a77eab
diff --git a/tests/unit-tests/security/transform/public-key.t.cpp b/tests/unit-tests/security/transform/public-key.t.cpp
index fee246f..20e071c 100644
--- a/tests/unit-tests/security/transform/public-key.t.cpp
+++ b/tests/unit-tests/security/transform/public-key.t.cpp
@@ -73,7 +73,7 @@
   OBufferStream os;
   bufferSource(pKeyPkcs8Base64, pKeyPkcs8Base64Len) >> base64Decode() >> streamSink(os);
   ConstBufferPtr pKeyPkcs8Buf = os.buf();
-  const uint8_t* pKeyPkcs8 = pKeyPkcs8Buf->buf();
+  const uint8_t* pKeyPkcs8 = pKeyPkcs8Buf->data();
   size_t pKeyPkcs8Len = pKeyPkcs8Buf->size();
 
   PublicKey pKey1;
@@ -119,7 +119,7 @@
   OBufferStream os;
   bufferSource("Y2lhbyFob2xhIWhlbGxvIQ==") >> base64Decode() >> streamSink(os);
 
-  BOOST_CHECK_THROW(pKey.encrypt(os.buf()->buf(), os.buf()->size()), PublicKey::Error);
+  BOOST_CHECK_THROW(pKey.encrypt(os.buf()->data(), os.buf()->size()), PublicKey::Error);
 }
 
 BOOST_AUTO_TEST_SUITE_END() // TestPublicKey