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[Kernel] Add XeCryptRc4* funcs

This commit is contained in:
emoose 2019-04-14 05:46:57 +01:00 committed by Triang3l
parent 5a6b42c611
commit 88bb173c9d
1 changed files with 51 additions and 0 deletions
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51
src/xenia/kernel/xboxkrnl/xboxkrnl_crypt.cc
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@ -25,11 +25,62 @@ namespace xe {
namespace kernel {
namespace xboxkrnl {
typedef struct {
uint8_t S[256]; // 0x0
uint8_t i; // 0x100
uint8_t j; // 0x101
} XECRYPT_RC4_STATE;
static_assert_size(XECRYPT_RC4_STATE, 0x102);
void XeCryptRc4Key(pointer_t<XECRYPT_RC4_STATE> rc4_ctx, lpvoid_t key,
dword_t key_size) {
// Setup RC4 state
rc4_ctx->i = rc4_ctx->j = 0;
for (uint32_t x = 0; x < 0x100; x++) {
rc4_ctx->S[x] = (uint8_t)x;
}
uint32_t idx = 0;
for (uint32_t x = 0; x < 0x100; x++) {
idx = (idx + rc4_ctx->S[x] + key[x % 0x10]) % 0x100;
uint8_t temp = rc4_ctx->S[idx];
rc4_ctx->S[idx] = rc4_ctx->S[x];
rc4_ctx->S[x] = temp;
}
}
DECLARE_XBOXKRNL_EXPORT1(XeCryptRc4Key, kNone, kImplemented);
void XeCryptRc4Ecb(pointer_t<XECRYPT_RC4_STATE> rc4_ctx, lpvoid_t data,
dword_t size) {
// Crypt data
for (uint32_t idx = 0; idx < size; idx++) {
rc4_ctx->i = (rc4_ctx->i + 1) % 0x100;
rc4_ctx->j = (rc4_ctx->j + rc4_ctx->S[rc4_ctx->i]) % 0x100;
uint8_t temp = rc4_ctx->S[rc4_ctx->i];
rc4_ctx->S[rc4_ctx->i] = rc4_ctx->S[rc4_ctx->j];
rc4_ctx->S[rc4_ctx->j] = temp;
uint8_t a = data[idx];
uint8_t b =
rc4_ctx->S[(rc4_ctx->S[rc4_ctx->i] + rc4_ctx->S[rc4_ctx->j]) % 0x100];
data[idx] = (uint8_t)(a ^ b);
}
}
DECLARE_XBOXKRNL_EXPORT1(XeCryptRc4Ecb, kNone, kImplemented);
void XeCryptRc4(lpvoid_t key, dword_t key_size, lpvoid_t data, dword_t size) {
XECRYPT_RC4_STATE rc4_ctx;
XeCryptRc4Key(&rc4_ctx, key, key_size);
XeCryptRc4Ecb(&rc4_ctx, data, size);
}
DECLARE_XBOXKRNL_EXPORT1(XeCryptRc4, kNone, kImplemented);
typedef struct {
xe::be<uint32_t> count; // 0x0
xe::be<uint32_t> state[5]; // 0x4
uint8_t buffer[64]; // 0x18
} XECRYPT_SHA_STATE;
static_assert_size(XECRYPT_SHA_STATE, 0x58);
void InitSha1(sha1::SHA1* sha, const XECRYPT_SHA_STATE* state) {
uint32_t digest[5];