From 8d3700b76b4ce8c48ac7cc006175a0bc23994e5f Mon Sep 17 00:00:00 2001
From: CTCaer <ctcaer@gmail.com>
Date: Fri, 15 Oct 2021 16:40:06 +0300
Subject: [PATCH] hos: improve error for missing BEK or corrupt pkg1 on T210B01

---
 bootloader/hos/hos.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/bootloader/hos/hos.c b/bootloader/hos/hos.c
index e4e8585..257e8ee 100644
--- a/bootloader/hos/hos.c
+++ b/bootloader/hos/hos.c
@@ -898,8 +898,17 @@ int hos_launch(ini_sec_t *cfg)
 			if (!pkg1_decrypt(ctxt.pkg1_id, ctxt.pkg1))
 			{
 				_hos_crit_error("Pkg1 decryption failed!");
+
+				// Check if T210B01 BEK is missing or wrong.
 				if (h_cfg.t210b01)
-					EPRINTF("Is BEK missing?");
+				{
+					u32 bek_vector[4] = {0};
+					se_aes_crypt_ecb(13, ENCRYPT, bek_vector, SE_KEY_128_SIZE, bek_vector, SE_KEY_128_SIZE);
+					if (bek_vector[0] == 0x59C14895) // Encrypted zeroes first 32bits.
+						EPRINTF("Pkg1 corrupt?");
+					else
+						EPRINTF("BEK is missing!");
+				}
 				goto error;
 			}
 		}