From efba39adc5dab4403108395606bc85110c4d33bd Mon Sep 17 00:00:00 2001
From: Pol Henarejos <pol.henarejos@cttc.es>
Date: Mon, 20 Mar 2023 17:58:01 +0100
Subject: [PATCH] Add SW_WRONG_DATA return on bad tag for Chachapoly.

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

diff --git a/src/hsm/cmd_cipher_sym.c b/src/hsm/cmd_cipher_sym.c
index 3d51e2e..e25e14d 100644
--- a/src/hsm/cmd_cipher_sym.c
+++ b/src/hsm/cmd_cipher_sym.c
@@ -308,6 +308,9 @@ int cmd_cipher_sym() {
             mbedtls_platform_zeroize(kdata, sizeof(kdata));
             mbedtls_chachapoly_free(&ctx);
             if (r != 0) {
+                if (r == MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED) {
+                    return SW_WRONG_DATA();
+                }
                 return SW_EXEC_ERROR();
             }
             if (algo == ALGO_EXT_CIPHER_ENCRYPT) {