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WiiSave: Reuse IOSC::Sign for signing

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leoetlino committed May 13, 2018
1 parent 07caac1 commit a2ffe010f3f6d5903400f6e09dbeec632c3f0c40
Showing with 15 additions and 65 deletions.
  1. +15 −63 Source/Core/Core/HW/WiiSave.cpp
  2. +0 −2 Source/Core/Core/HW/WiiSave.h
@@ -14,7 +14,6 @@
#include <cstdio>
#include <cstring>
#include <mbedtls/md5.h>
#include <mbedtls/sha1.h>
#include <memory>
#include <string>
#include <vector>
@@ -28,6 +27,7 @@
#include "Common/MsgHandler.h"
#include "Common/NandPaths.h"
#include "Common/StringUtil.h"
#include "Core/CommonTitles.h"
#include "Core/IOS/IOS.h"
#include "Core/IOS/IOSC.h"
#include "Core/IOS/Uids.h"
@@ -461,95 +461,47 @@ void WiiSave::do_sig()
if (!m_valid)
u8 sig[0x40];
u8 ng_cert[0x180];
u8 ap_cert[0x180];
u8 hash[0x14];
u8 ap_priv[30];
u8 ap_sig[60];
char signer[64];
char name[64];
u32 data_size;
const u32 ng_key_id = 0x6AAB8C59;
const u8 ng_priv[30] = {0, 0xAB, 0xEE, 0xC1, 0xDD, 0xB4, 0xA6, 0x16, 0x6B, 0x70,
0xFD, 0x7E, 0x56, 0x67, 0x70, 0x57, 0x55, 0x27, 0x38, 0xA3,
0x26, 0xC5, 0x46, 0x16, 0xF7, 0x62, 0xC9, 0xED, 0x73, 0xF2};
const u8 ng_sig[0x3C] = {0, 0xD8, 0x81, 0x63, 0xB2, 0x00, 0x6B, 0x0B, 0x54, 0x82, 0x88, 0x63,
0x81, 0x1C, 0x00, 0x71, 0x12, 0xED, 0xB7, 0xFD, 0x21, 0xAB, 0x0E, 0x50,
0x0E, 0x1F, 0xBF, 0x78, 0xAD, 0x37, 0x00, 0x71, 0x8D, 0x82, 0x41, 0xEE,
0x45, 0x11, 0xC7, 0x3B, 0xAC, 0x08, 0xB6, 0x83, 0xDC, 0x05, 0xB8, 0xA8,
0x90, 0x1F, 0xA8, 0x2A, 0x0E, 0x4E, 0x76, 0xEF, 0x44, 0x72, 0x99, 0xF8};
sprintf(signer, "Root-CA00000001-MS00000002");
sprintf(name, "NG%08x", s_ng_id);
make_ec_cert(ng_cert, ng_sig, signer, name, ng_priv, ng_key_id);
memset(ap_priv, 0, sizeof ap_priv);
ap_priv[10] = 1;
memset(ap_sig, 81, sizeof ap_sig); // temp
sprintf(signer, "Root-CA00000001-MS00000002-NG%08x", s_ng_id);
sprintf(name, "AP%08x%08x", 1, 2);
make_ec_cert(ap_cert, ap_sig, signer, name, ap_priv, 0);
mbedtls_sha1(ap_cert + 0x80, 0x100, hash);
generate_ecdsa(ap_sig, ap_sig + 30, ng_priv, hash);
make_ec_cert(ap_cert, ap_sig, signer, name, ap_priv, 0);
data_size = m_bk_hdr.size_of_files + 0x80;
File::IOFile data_file(m_encrypted_save_path, "rb");
if (!data_file)
m_valid = false;
auto data = std::make_unique<u8[]>(data_size);
// Read data to sign.
const u32 data_size = m_bk_hdr.size_of_files + 0x80;
auto data = std::make_unique<u8[]>(data_size);
data_file.Seek(0xf0c0, SEEK_SET);
if (!data_file.ReadBytes(data.get(), data_size))
m_valid = false;
mbedtls_sha1(data.get(), data_size, hash);
mbedtls_sha1(hash, 20, hash);
// Sign the data.
IOS::Certificate ap_cert;
IOS::ECCSignature ap_sig;
m_ios.GetIOSC().Sign(,, Titles::SYSTEM_MENU, data.get(), data_size);
// Write signatures.
data_file.Open(m_encrypted_save_path, "ab");
if (!data_file)
m_valid = false;
generate_ecdsa(sig, sig + 30, ap_priv, hash);
*(u32*)(sig + 60) = Common::swap32(0x2f536969);
data_file.WriteArray(sig, sizeof(sig));
data_file.WriteArray(ng_cert, sizeof(ng_cert));
data_file.WriteArray(ap_cert, sizeof(ap_cert));
data_file.WriteArray(, ap_sig.size());
const u32 SIGNATURE_END_MAGIC = Common::swap32(0x2f536969);
data_file.WriteArray(&SIGNATURE_END_MAGIC, sizeof(SIGNATURE_END_MAGIC));
const IOS::Certificate device_certificate = m_ios.GetIOSC().GetDeviceCertificate();
data_file.WriteArray(, device_certificate.size());
data_file.WriteArray(, ap_cert.size());
m_valid = data_file.IsGood();
void WiiSave::make_ec_cert(u8* cert, const u8* sig, const char* signer, const char* name,
const u8* priv, const u32 key_id)
memset(cert, 0, 0x180);
*(u32*)cert = Common::swap32(0x10002);
memcpy(cert + 4, sig, 60);
strcpy((char*)cert + 0x80, signer);
*(u32*)(cert + 0xc0) = Common::swap32(2);
strcpy((char*)cert + 0xc4, name);
*(u32*)(cert + 0x104) = Common::swap32(key_id);
ec_priv_to_pub(priv, cert + 0x108);
bool WiiSave::getPaths(bool for_export)
if (m_title_id)
@@ -45,8 +45,6 @@ class WiiSave
void ImportWiiSaveFiles();
void ExportWiiSaveFiles();
void do_sig();
void make_ec_cert(u8* cert, const u8* sig, const char* signer, const char* name, const u8* priv,
const u32 key_id);
bool getPaths(bool for_export = false);
void ScanForFiles(const std::string& save_directory, std::vector<std::string>& file_list,
u32* num_files, u32* size_files);

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