[Util] Added crypto utils required for decrypting/encrypting account data.

Thanks Emoose for implementation

src/xenia/kernel/util/crypto_utils.cc

@@ -0,0 +1,130 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2024 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+#include <algorithm>
+
+#include "xenia/kernel/util/crypto_utils.h"
+#include "xenia/xbox.h"
+
+#include "third_party/crypto/TinySHA1.hpp"
+
+namespace xe {
+namespace kernel {
+namespace util {
+
+uint8_t xekey_0x19[] = {0xE1, 0xBC, 0x15, 0x9C, 0x73, 0xB1, 0xEA, 0xE9,
+                        0xAB, 0x31, 0x70, 0xF3, 0xAD, 0x47, 0xEB, 0xF3};
+
+uint8_t xekey_0x19_devkit[] = {0xDA, 0xB6, 0x9A, 0xD9, 0x8E, 0x28, 0x76, 0x4F,
+                               0x97, 0x7E, 0xE2, 0x48, 0x7E, 0x4F, 0x3F, 0x68};
+
+const uint8_t* GetXeKey(uint32_t idx, bool devkit) {
+  if (idx != 0x19) {
+    return nullptr;
+  }
+
+  return devkit ? xekey_0x19_devkit : xekey_0x19;
+}
+
+void HmacSha(const uint8_t* key, uint32_t key_size_in, const uint8_t* inp_1,
+             uint32_t inp_1_size, const uint8_t* inp_2, uint32_t inp_2_size,
+             const uint8_t* inp_3, uint32_t inp_3_size, uint8_t* out,
+             uint32_t out_size) {
+  uint32_t key_size = key_size_in;
+  sha1::SHA1 sha;
+  uint8_t kpad_i[0x40];
+  uint8_t kpad_o[0x40];
+  uint8_t tmp_key[0x40];
+  std::memset(kpad_i, 0x36, 0x40);
+  std::memset(kpad_o, 0x5C, 0x40);
+
+  // Setup HMAC key
+  // If > block size, use its hash
+  if (key_size > 0x40) {
+    sha1::SHA1 sha_key;
+    sha_key.processBytes(key, key_size);
+    sha_key.finalize((uint8_t*)tmp_key);
+
+    key_size = 0x14u;
+  } else {
+    std::memcpy(tmp_key, key, key_size);
+  }
+
+  for (uint32_t i = 0; i < key_size; i++) {
+    kpad_i[i] = tmp_key[i] ^ 0x36;
+    kpad_o[i] = tmp_key[i] ^ 0x5C;
+  }
+
+  // Inner
+  sha.processBytes(kpad_i, 0x40);
+
+  if (inp_1_size) {
+    sha.processBytes(inp_1, inp_1_size);
+  }
+
+  if (inp_2_size) {
+    sha.processBytes(inp_2, inp_2_size);
+  }
+
+  if (inp_3_size) {
+    sha.processBytes(inp_3, inp_3_size);
+  }
+
+  uint8_t digest[0x14];
+  sha.finalize(digest);
+  sha.reset();
+
+  // Outer
+  sha.processBytes(kpad_o, 0x40);
+  sha.processBytes(digest, 0x14);
+  sha.finalize(digest);
+
+  std::memcpy(out, digest, std::min((uint32_t)out_size, 0x14u));
+}
+
+void RC4(const uint8_t* key, uint32_t key_size_in, const uint8_t* data,
+         uint32_t data_size, uint8_t* out, uint32_t out_size) {
+  uint8_t tmp_key[0x10];
+  uint32_t sbox_size;
+  uint8_t sbox[0x100];
+  uint32_t i;
+  uint32_t j;
+
+  // Setup RC4 session...
+  std::memcpy(tmp_key, key, 0x10);
+  i = j = 0;
+  sbox_size = 0x100;
+  for (uint32_t x = 0; x < sbox_size; x++) {
+    sbox[x] = (uint8_t)x;
+  }
+
+  uint32_t idx = 0;
+  for (uint32_t x = 0; x < sbox_size; x++) {
+    idx = (idx + sbox[x] + key[x % 0x10]) % sbox_size;
+    uint8_t temp = sbox[idx];
+    sbox[idx] = sbox[x];
+    sbox[x] = temp;
+  }
+
+  // Crypt data
+  for (uint32_t idx = 0; idx < data_size; idx++) {
+    i = (i + 1) % sbox_size;
+    j = (j + sbox[i]) % sbox_size;
+    uint8_t temp = sbox[i];
+    sbox[i] = sbox[j];
+    sbox[j] = temp;
+
+    uint8_t a = data[idx];
+    uint8_t b = sbox[(sbox[i] + sbox[j]) % sbox_size];
+    out[idx] = (uint8_t)(a ^ b);
+  }
+}
+
+}  // namespace util
+}  // namespace kernel
+}  // namespace xe

src/xenia/kernel/util/crypto_utils.h

@@ -0,0 +1,28 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2024 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/xbox.h"
+
+namespace xe {
+namespace kernel {
+namespace util {
+
+const uint8_t* GetXeKey(uint32_t idx, bool devkit = false);
+
+void HmacSha(const uint8_t* key, uint32_t key_size_in, const uint8_t* inp_1,
+             uint32_t inp_1_size, const uint8_t* inp_2, uint32_t inp_2_size,
+             const uint8_t* inp_3, uint32_t inp_3_size, uint8_t* out,
+             uint32_t out_size);
+
+void RC4(const uint8_t* key, uint32_t key_size_in, const uint8_t* data,
+         uint32_t data_size, uint8_t* out, uint32_t out_size);
+
+}  // namespace util
+}  // namespace kernel
+}  // namespace xe