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initial AES decryption for Wii Discs

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This commit is contained in:
Jack Andersen
2015-06-28 19:35:25 -10:00
parent 03a371b7bf
commit f297c7ff37
6 changed files with 759 additions and 7 deletions
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72
lib/DiscWii.cpp
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@@ -1,9 +1,15 @@
#include <stdio.h>
#include "DiscWii.hpp"
#include "aes.hpp"
namespace NOD
{
static const uint8_t COMMON_KEY[] = {0xeb, 0xe4, 0x2a, 0x22,
0x5e, 0x85, 0x93, 0xe4,
0x48, 0xd9, 0xc5, 0x45,
0x73, 0x81, 0xaa, 0xf7};
class PartitionWii : public DiscBase::IPartition
{
struct Ticket
@@ -156,6 +162,9 @@ class PartitionWii : public DiscBase::IPartition
Certificate m_tmdCert;
Certificate m_ticketCert;
size_t m_dataOff;
uint8_t m_decKey[16];
public:
PartitionWii(const DiscWii& parent, Kind kind, size_t offset)
: IPartition(parent, kind, offset)
@@ -184,6 +193,7 @@ public:
uint32_t dataOff;
s->read(&dataOff, 4);
dataOff = SBig(dataOff) << 2;
m_dataOff = offset + dataOff;
uint32_t dataSize;
s->read(&dataSize, 4);
dataSize = SBig(dataSize) << 2;
@@ -196,6 +206,68 @@ public:
m_tmdCert.read(*s.get());
m_ticketCert.read(*s.get());
/* Decrypt title key */
std::unique_ptr<IAES> aes = NewAES();
uint8_t iv[16] = {};
memcpy(iv, m_ticket.titleId, 8);
aes->setKey(COMMON_KEY);
aes->decrypt(iv, m_ticket.encKey, m_decKey, 16);
parseFST();
}
class PartReadStream : public DiscBase::IPartReadStream
{
std::unique_ptr<IAES> m_aes;
const PartitionWii& m_parent;
size_t m_baseOffset;
size_t m_offset;
std::unique_ptr<IDiscIO::IReadStream> m_dio;
uint8_t m_encBuf[0x8000];
uint8_t m_decBuf[0x7c00];
void decryptBlock()
{
m_dio->read(m_encBuf, 0x8000);
m_aes->decrypt(&m_encBuf[0x3d0], &m_encBuf[0x400], m_decBuf, 0x7c00);
}
public:
PartReadStream(const PartitionWii& parent, size_t baseOffset, size_t offset)
: m_aes(NewAES()), m_parent(parent), m_baseOffset(baseOffset), m_offset(offset)
{
m_aes->setKey(parent.m_decKey);
size_t block = m_offset / 0x7c00;
m_dio = m_parent.m_parent.getDiscIO().beginReadStream(m_baseOffset + block * 0x8000);
}
size_t read(void* buf, size_t length)
{
size_t cacheOffset = m_offset % 0x7c00;
size_t cacheSize;
uint8_t* dst = (uint8_t*)buf;
while (length)
{
decryptBlock();
cacheSize = length;
if (cacheSize + cacheOffset > 0x7c00)
cacheSize = 0x7c00 - cacheOffset;
memcpy(dst, m_decBuf + cacheOffset, cacheSize);
dst += cacheSize;
length -= cacheSize;
cacheOffset = 0;
}
m_offset += length;
return dst - (uint8_t*)buf;
}
};
std::unique_ptr<DiscBase::IPartReadStream> beginReadStream(size_t offset) const
{
return std::unique_ptr<DiscBase::IPartReadStream>(new PartReadStream(*this, m_dataOff, offset));
}
};