55 lines
2.5 KiB
C
55 lines
2.5 KiB
C
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/*
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* Copyright (c) 2022 shchmue
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "nfc_crypto.h"
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#include <mem/minerva.h>
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#include <sec/se.h>
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#include <string.h>
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void nfc_decrypt_amiibo_keys(key_storage_t *keys, nfc_save_key_t out_nfc_save_keys[2], bool is_dev) {
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const u8 *encrypted_keys = is_dev ? encrypted_nfc_keys_dev : encrypted_nfc_keys;
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u32 kek[SE_KEY_128_SIZE / 4] = {0};
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decrypt_aes_key(KS_AES_ECB, keys, kek, nfc_key_source, 0, 0);
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nfc_keyblob_t __attribute__((aligned(4))) nfc_keyblob;
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static const u8 nfc_iv[SE_KEY_128_SIZE] = {
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0xB9, 0x1D, 0xC1, 0xCF, 0x33, 0x5F, 0xA6, 0x13, 0x2A, 0xEF, 0x90, 0x99, 0xAA, 0xCA, 0x93, 0xC8};
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se_aes_key_set(KS_AES_CTR, kek, SE_KEY_128_SIZE);
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se_aes_crypt_ctr(KS_AES_CTR, &nfc_keyblob, sizeof(nfc_keyblob), encrypted_keys, sizeof(nfc_keyblob), &nfc_iv);
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minerva_periodic_training();
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u32 xor_pad[0x20 / 4] = {0};
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se_aes_key_set(KS_AES_CTR, nfc_keyblob.ctr_key, SE_KEY_128_SIZE);
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se_aes_crypt_ctr(KS_AES_CTR, xor_pad, sizeof(xor_pad), xor_pad, sizeof(xor_pad), nfc_keyblob.ctr_iv);
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minerva_periodic_training();
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memcpy(out_nfc_save_keys[0].hmac_key, nfc_keyblob.hmac_key, sizeof(nfc_keyblob.hmac_key));
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memcpy(out_nfc_save_keys[0].phrase, nfc_keyblob.phrase, sizeof(nfc_keyblob.phrase));
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out_nfc_save_keys[0].seed_size = sizeof(nfc_keyblob.seed);
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memcpy(out_nfc_save_keys[0].seed, nfc_keyblob.seed, sizeof(nfc_keyblob.seed));
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memcpy(out_nfc_save_keys[0].xor_pad, xor_pad, sizeof(xor_pad));
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memcpy(out_nfc_save_keys[1].hmac_key, nfc_keyblob.hmac_key_for_verif, sizeof(nfc_keyblob.hmac_key_for_verif));
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memcpy(out_nfc_save_keys[1].phrase, nfc_keyblob.phrase_for_verif, sizeof(nfc_keyblob.phrase_for_verif));
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out_nfc_save_keys[1].seed_size = sizeof(nfc_keyblob.seed_for_verif);
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memcpy(out_nfc_save_keys[1].seed, nfc_keyblob.seed_for_verif, sizeof(nfc_keyblob.seed_for_verif));
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memcpy(out_nfc_save_keys[1].xor_pad, xor_pad, sizeof(xor_pad));
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}
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