Introduced entropy_free()
diff --git a/programs/pkey/rsa_encrypt.c b/programs/pkey/rsa_encrypt.c
index c444c1a..2ed27e2 100644
--- a/programs/pkey/rsa_encrypt.c
+++ b/programs/pkey/rsa_encrypt.c
@@ -148,6 +148,7 @@
     printf( "\n  . Done (created \"%s\")\n\n", "result-enc.txt" );
 
 exit:
+    entropy_free( &entropy );
 
 #if defined(_WIN32)
     printf( "  + Press Enter to exit this program.\n" );