diff --git a/src/security/detail/openssl-helper.cpp b/src/security/detail/openssl-helper.cpp
index 12d1106..27177e2 100644
--- a/src/security/detail/openssl-helper.cpp
+++ b/src/security/detail/openssl-helper.cpp
@@ -36,6 +36,17 @@
   }
 }
 
+int
+getEvpPkeyType(EVP_PKEY* key)
+{
+  return
+#if OPENSSL_VERSION_NUMBER < 0x1010000fL
+    EVP_PKEY_type(key->type);
+#else
+    EVP_PKEY_base_id(key);
+#endif // OPENSSL_VERSION_NUMBER < 0x1010000fL
+}
+
 EvpPkeyCtx::EvpPkeyCtx(EVP_PKEY* key)
   : m_ctx(EVP_PKEY_CTX_new(key, nullptr))
 {
diff --git a/src/security/detail/openssl-helper.hpp b/src/security/detail/openssl-helper.hpp
index ddd1ea6..dfc630d 100644
--- a/src/security/detail/openssl-helper.hpp
+++ b/src/security/detail/openssl-helper.hpp
@@ -32,6 +32,9 @@
 const EVP_MD*
 toDigestEvpMd(DigestAlgorithm algo);
 
+int
+getEvpPkeyType(EVP_PKEY* key);
+
 class EvpPkeyCtx : noncopyable
 {
 public:
diff --git a/src/security/transform/private-key.cpp b/src/security/transform/private-key.cpp
index b7820c3..3ec0ff6 100644
--- a/src/security/transform/private-key.cpp
+++ b/src/security/transform/private-key.cpp
@@ -265,13 +265,7 @@
 {
   ENSURE_PRIVATE_KEY_LOADED(m_impl->key);
 
-  int keyType =
-#if OPENSSL_VERSION_NUMBER < 0x1010000fL
-    EVP_PKEY_type(m_impl->key->type);
-#else
-    EVP_PKEY_base_id(m_impl->key);
-#endif // OPENSSL_VERSION_NUMBER < 0x1010000fL
-
+  int keyType = detail::getEvpPkeyType(m_impl->key);
   switch (keyType) {
     case EVP_PKEY_NONE:
       BOOST_THROW_EXCEPTION(Error("Failed to determine key type"));
diff --git a/src/security/transform/public-key.cpp b/src/security/transform/public-key.cpp
index 3240cee..13b8f00 100644
--- a/src/security/transform/public-key.cpp
+++ b/src/security/transform/public-key.cpp
@@ -73,20 +73,13 @@
 {
   ENSURE_PUBLIC_KEY_LOADED(m_impl->key);
 
-  int keyType =
-#if OPENSSL_VERSION_NUMBER < 0x1010000fL
-    EVP_PKEY_type(m_impl->key->type);
-#else
-    EVP_PKEY_base_id(m_impl->key);
-#endif // OPENSSL_VERSION_NUMBER < 0x1010000fL
-
-  switch (keyType) {
+  switch (detail::getEvpPkeyType(m_impl->key)) {
   case EVP_PKEY_RSA:
     return KeyType::RSA;
   case EVP_PKEY_EC:
     return KeyType::EC;
   default:
-    BOOST_THROW_EXCEPTION(Error("Unrecognized public key type"));
+    return KeyType::NONE;
   }
 }
 
@@ -140,13 +133,7 @@
 {
   ENSURE_PUBLIC_KEY_LOADED(m_impl->key);
 
-  int keyType =
-#if OPENSSL_VERSION_NUMBER < 0x1010000fL
-    EVP_PKEY_type(m_impl->key->type);
-#else
-    EVP_PKEY_base_id(m_impl->key);
-#endif // OPENSSL_VERSION_NUMBER < 0x1010000fL
-
+  int keyType = detail::getEvpPkeyType(m_impl->key);
   switch (keyType) {
     case EVP_PKEY_NONE:
       BOOST_THROW_EXCEPTION(Error("Failed to determine key type"));