atjboottool: document more header fields and crypto code

The encryption definitely uses some standard elliptic curve encryption over
binary fields (163 and 233 bits, standard polynomials). It is still unclear
how this is used in the actual encryption, the key authentification and
derivation do not look standard.

Change-Id: I6b9180ff7e6115e1dceca8489e986a02a9ea6fc9

1 files changed, 2 insertions, 7 deletions

diff --git a/utils/atj2137/atjboottool/atj_tables.c b/utils/atj2137/atjboottool/atj_tables.c
index ab3444cbaa..579e17d52b 100644
--- a/utils/atj2137/atjboottool/atj_tables.c
+++ b/utils/atj2137/atjboottool/atj_tables.c
@@ -109,11 +109,6 @@ uint8_t g_decode_B_table[20] =
     0xf8, 0xb4, 0x36, 0x41, 0xc5, 0x51, 0xaf
 };
 
-uint32_t g_xor_key[9] =
-{
-    1, 0, 0, 0, 0, 0, 0, 0, 0
-};
-
 uint32_t g_crypto_table[8] =
 {
     0xefad6126, 0x0a4c9d6e, 0x19c26bf5, 0x149563a4, 0x29f22ff4, 0x7e731af1,
@@ -142,7 +137,7 @@ uint32_t g_crypto_key4[6] =
     0x797324f1, 0xb11c5c0c, 0xa2cdd545, 0x71a0094f, 0xd51fbc6c, 0x00000000
 };
 
-uint32_t g_crypto_data3[6] =
+uint32_t g_atj_ec163_a[6] =
 {
     0x00000001, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000
 };
@@ -152,7 +147,7 @@ uint32_t g_crypto_key5[6] =
     0x4a3205fd, 0x512f7874, 0x1481eb10, 0xb8c953ca, 0x0a601907, 0x00000002
 };
 
-uint32_t g_crypto_data[8] =
+uint32_t g_atj_ec233_a[8] =
 {
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
 };