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https://github.com/Atmosphere-NX/Atmosphere.git
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Simplify some logic in derive_nx_keydata
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c0617982b8
commit
ab4518b9c1
1 changed files with 9 additions and 19 deletions
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@ -64,16 +64,17 @@ static bool safe_memcmp(uint8_t *a, uint8_t *b, size_t sz) {
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}
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static int decrypt_keyblob(const nx_keyblob_t *keyblobs, uint32_t revision, uint32_t available_revision) {
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nx_keyblob_t keyblob;
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uint8_t work_buffer[0x10];
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nx_keyblob_t __attribute__((aligned(16))) keyblob;
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uint8_t __attribute__((aligned(16))) work_buffer[0x10];
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unsigned int keyslot = revision == MASTERKEY_REVISION_100_230 ? 0xF : KEYSLOT_SWITCH_TEMPKEY;
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if (get_keyblob(&keyblob, revision, keyblobs, available_revision) != 0) {
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return -1;
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}
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se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[revision], 0x10);
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decrypt_data_into_keyslot(KEYSLOT_SWITCH_TEMPKEY, 0xE, work_buffer, 0x10);
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decrypt_data_into_keyslot(0xB, KEYSLOT_SWITCH_TEMPKEY, keyblob_mac_seed, 0x10);
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decrypt_data_into_keyslot(keyslot, 0xE, work_buffer, 0x10);
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decrypt_data_into_keyslot(0xB, keyslot, keyblob_mac_seed, 0x10);
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/* Validate keyblob. */
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se_compute_aes_128_cmac(0xB, work_buffer, 0x10, keyblob.mac + sizeof(keyblob.mac), sizeof(keyblob) - sizeof(keyblob.mac));
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@ -97,8 +98,7 @@ int load_package1_key(uint32_t revision) {
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/* Derive all Switch keys. */
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int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, uint32_t available_revision, const void *tsec_fw, size_t tsec_fw_size) {
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uint8_t work_buffer[0x10];
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nx_dec_keyblob_t dec_keyblob;
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uint8_t __attribute__((aligned(16))) work_buffer[0x10];
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/* TODO: Set keyslot flags properly in preparation of derivation. */
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set_aes_keyslot_flags(0xE, 0x15);
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@ -110,7 +110,7 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
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}
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set_aes_keyslot(0xD, work_buffer, 0x10);
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/* Decrypt all keyblobs. */
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/* Decrypt all keyblobs, setting keyslot 0xF correctly. */
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for (unsigned int rev = 0; rev < MASTERKEY_REVISION_MAX; rev++) {
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int ret = decrypt_keyblob(keyblobs, rev, available_revision);
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if (ret) {
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@ -118,21 +118,11 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
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}
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}
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/* Always try to set up the highest possible master key. */
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/* Derive both keyblob key 1, and keyblob key latest. */
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se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[MASTERKEY_REVISION_100_230], 0x10);
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decrypt_data_into_keyslot(0xF, 0xE, work_buffer, 0x10);
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se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[MASTERKEY_REVISION_500_CURRENT], 0x10);
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decrypt_data_into_keyslot(0xD, 0xE, work_buffer, 0x10);
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/* Clear the SBK. */
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clear_aes_keyslot(0xE);
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/* Get latest keyblob. */
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dec_keyblob = g_dec_keyblobs[MASTERKEY_REVISION_500_CURRENT];
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/* Get needed data. */
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set_aes_keyslot(0xC, dec_keyblob.keys[0], 0x10);
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set_aes_keyslot(0xC, g_dec_keyblobs[MASTERKEY_REVISION_500_CURRENT].keys[0], 0x10);
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/* Derive keys for Exosphere, lock critical keyslots. */
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switch (target_firmware) {
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