diff --git b/rules.mk a/rules.mk
index c7476cb..0257d05 100644
--- b/rules.mk
+++ a/rules.mk
@@ -13,9 +13,6 @@ MODULE_RUSTFLAGS += \
 
 MODULE_LIBRARY_DEPS := \
 	external/rust/crates/der \
-	external/rust/crates/pkcs5 \
-	external/rust/crates/rand_core \
 	external/rust/crates/spki \
-	external/rust/crates/subtle \
 
 include make/library.mk