From 4bf5a80a7a87eb445640989fde3b47cca962b5e8 Mon Sep 17 00:00:00 2001
From: Pol Henarejos <pol.henarejos@cttc.es>
Date: Fri, 3 Jun 2022 20:13:18 +0200
Subject: [PATCH] Added key usage counter to decryption operations.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
---
 src/hsm/sc_hsm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/hsm/sc_hsm.c b/src/hsm/sc_hsm.c
index a753305..b321f82 100644
--- a/src/hsm/sc_hsm.c
+++ b/src/hsm/sc_hsm.c
@@ -1637,6 +1637,8 @@ static int cmd_decrypt_asym() {
     file_t *ef = search_dynamic_file((KEY_PREFIX << 8) | key_id);
     if (!ef)
         return SW_FILE_NOT_FOUND();
+    if (get_key_counter(ef) == 0)
+        return SW_FILE_FULL();
     if (P2(apdu) == ALGO_RSA_DECRYPT) {
         mbedtls_rsa_context ctx;
         mbedtls_rsa_init(&ctx);
@@ -1702,6 +1704,7 @@ static int cmd_decrypt_asym() {
     }
     else
         return SW_WRONG_P1P2();
+    decrement_key_counter(ef);
     return SW_OK();
 }