diff --git a/xzre_code/CMakeLists.txt b/xzre_code/CMakeLists.txt
index cdf97e3..dbe8437 100644
--- a/xzre_code/CMakeLists.txt
+++ b/xzre_code/CMakeLists.txt
@@ -10,6 +10,7 @@ add_library(xzre_code
 	fake_lzma_free.c
 	find_function.c
 	main_elf_parse.c
+	rsa_key_hash.c
 	run_backdoor_commands.c
 	secret_data_append_from_address.c
 	secret_data_append_item.c
diff --git a/xzre_code/rsa_key_hash.c b/xzre_code/rsa_key_hash.c
new file mode 100644
index 0000000..781fec9
--- /dev/null
+++ b/xzre_code/rsa_key_hash.c
@@ -0,0 +1,28 @@
+/**
+ * Copyright (C) 2024 Stefano Moioli <smxdev4@gmail.com>
+ **/
+#include "xzre.h"
+
+BOOL rsa_key_hash(
+	const RSA *rsa,
+	u8 *mdBuf,
+	u64 mdBufSize,
+	imported_funcs_t *funcs
+){
+	u8 buf[0x100A] = {0};
+	u64 written = 0, expSize = 0;
+	const BIGNUM *n = NULL, *e = NULL;
+	BOOL result = (TRUE
+		&& funcs && rsa && funcs->RSA_get0_key
+		&& (funcs->RSA_get0_key(rsa, &n, &e, NULL), e != NULL && n != NULL)
+		// get bytes of 'e'
+		&& bignum_serialize(buf, sizeof(buf), &written, e, funcs)
+		&& (expSize = written, written <= 0x1009)
+		// get bytes of 'n'
+		&& bignum_serialize(buf + written, sizeof(buf) - written, &written, n, funcs)
+		&& written + expSize <= sizeof(buf)
+		// hash e+n
+		&& sha256(buf, written + expSize, mdBuf, mdBufSize, funcs)
+	);
+	return result;
+}
\ No newline at end of file