Make oid_get_pk_alg handle EC algorithms
diff --git a/include/polarssl/pk.h b/include/polarssl/pk.h
index d9639ee..169753d 100644
--- a/include/polarssl/pk.h
+++ b/include/polarssl/pk.h
@@ -38,6 +38,8 @@
     POLARSSL_PK_NONE=0,
     POLARSSL_PK_RSA,
     POLARSSL_PK_ECDSA,
+    POLARSSL_PK_ECKEY,
+    POLARSSL_PK_ECKEY_DH,
 } pk_type_t;
 
 #ifdef __cplusplus