forked from len0rd/rockbox
e232f69214
Added fw modifications required to unpack real world player dumps. Documented more fwu header fields, magic numbers and finite field arithmetics (extended Euclidean for inverse, long division for reducing modulo field_poly). v3 encryption used is standard RC4 with the key additionally ciphered by the Elliptic Curve Integrated Encryption Scheme. Either sect233k1 (NIST K-233) or sect163r2 (NIST B-163) curves can be used, with the former overwhelmingly prevailing, being hardwired in SDK's maker.exe. Using a private/public key scheme is superfluous because both are stored in the firmware, with the added level of complexity likely serving the purpose of obfuscation. The private key is generated at random with each invokation. None of KDF or MAC from ECIES are used, RC4 key is directly xored with the shared secret. The random number r used to calculate rG isn't stored, but that's unimportant since only krG == rkG is actually used in the encryption. Change-Id: Ieacf8cc744bc90c7c5582dd724b2c10a41bfc191
35 lines
1.4 KiB
C
35 lines
1.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2012 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __ATJ_TABLES__
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#define __ATJ_TABLES__
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extern uint8_t g_decode_A_table[1024];
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extern uint8_t g_decode_B_table[20];
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extern uint32_t g_sect233k1_G_x[8];
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extern uint32_t g_sect233k1_G_y[8];
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extern uint32_t g_sect233k1_b[8];
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extern uint32_t g_sect163r2_G_x[6];
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extern uint32_t g_sect163r2_G_y[6];
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extern uint32_t g_sect163r2_a[6];
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extern uint32_t g_sect163r2_b[6];
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extern uint32_t g_sect233k1_a[8];
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#endif // __ATJ_TABLES__
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