change BOOST_THROW to NDN_THROW

Change-Id: Ic5a0192302dd2965258d616fe163f3539b2104ea
diff --git a/src/crypto-support/crypto-helper.cpp b/src/crypto-support/crypto-helper.cpp
index 916bee4..2920fdb 100644
--- a/src/crypto-support/crypto-helper.cpp
+++ b/src/crypto-support/crypto-helper.cpp
@@ -378,7 +378,7 @@
 handleErrors(const std::string& errorInfo)
 {
   NDN_LOG_DEBUG("Error in CRYPTO SUPPORT " << errorInfo);
-  BOOST_THROW_EXCEPTION(CryptoError("Error in CRYPTO SUPPORT: " + errorInfo));
+  NDN_THROW(CryptoError("Error in CRYPTO SUPPORT: " + errorInfo));
 }
 
 } // namespace ndncert