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[Kernel] Implement XeKeysObscureKey & XeKeysAesCbcUsingKey

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emoose 2019-08-18 03:54:49 +01:00 committed by Rick Gibbed
parent b22d76f0f9
commit 06cacbb9af
1 changed files with 34 additions and 0 deletions
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34
src/xenia/kernel/xboxkrnl/xboxkrnl_crypt.cc
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@ -509,6 +509,40 @@ dword_result_t XeKeysHmacSha(dword_t key_num, lpvoid_t inp_1,
}
DECLARE_XBOXKRNL_EXPORT1(XeKeysHmacSha, kNone, kImplemented);
static const uint8_t xe_key_obfuscation_key[16] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
dword_result_t XeKeysAesCbcUsingKey(lpvoid_t obscured_key, lpvoid_t inp_ptr,
dword_t inp_size, lpvoid_t out_ptr,
lpvoid_t feed_ptr, dword_t encrypt) {
uint8_t key[16];
// Deobscure key
XECRYPT_AES_STATE aes;
XeCryptAesKey(&aes, (uint8_t*)xe_key_obfuscation_key);
XeCryptAesEcb(&aes, obscured_key, key, 0);
// Run CBC using deobscured key
XeCryptAesKey(&aes, key);
XeCryptAesCbc(&aes, inp_ptr, inp_size, out_ptr, feed_ptr, encrypt);
return X_STATUS_SUCCESS;
}
DECLARE_XBOXKRNL_EXPORT1(XeKeysAesCbcUsingKey, kNone, kImplemented);
dword_result_t XeKeysObscureKey(lpvoid_t input, lpvoid_t output) {
// Based on HvxKeysObscureKey
// Seems to encrypt input with per-console KEY_OBFUSCATION_KEY (key 0x18)
XECRYPT_AES_STATE aes;
XeCryptAesKey(&aes, (uint8_t*)xe_key_obfuscation_key);
XeCryptAesEcb(&aes, input, output, 1);
return X_STATUS_SUCCESS;
}
DECLARE_XBOXKRNL_EXPORT1(XeKeysObscureKey, kNone, kImplemented);
void RegisterCryptExports(xe::cpu::ExportResolver* export_resolver,
KernelState* kernel_state) {}