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WIA: Decrypt Wii data when writing

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This commit is contained in:
JosJuice
2020-04-14 11:40:32 +02:00
parent 115edea34e
commit 3b8c44fd0e
4 changed files with 350 additions and 63 deletions
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25
Source/Core/DiscIO/VolumeWii.cpp
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@ -201,18 +201,9 @@ bool VolumeWii::Read(u64 offset, u64 length, u8* buffer, const Partition& partit
if (!m_reader->Read(block_offset_on_disc, BLOCK_TOTAL_SIZE, read_buffer.data()))
return false;
// Decrypt the block's data.
// 0x3D0 - 0x3DF in read_buffer will be overwritten,
// but that won't affect anything, because we won't
// use the content of read_buffer anymore after this
mbedtls_aes_crypt_cbc(aes_context, MBEDTLS_AES_DECRYPT, BLOCK_DATA_SIZE, &read_buffer[0x3D0],
&read_buffer[BLOCK_HEADER_SIZE], m_last_decrypted_block_data);
// Decrypt the block's data
DecryptBlockData(read_buffer.data(), m_last_decrypted_block_data, aes_context);
m_last_decrypted_block = block_offset_on_disc;
// The only thing we currently use from the 0x000 - 0x3FF part
// of the block is the IV (at 0x3D0), but it also contains SHA-1
// hashes that IOS uses to check that discs aren't tampered with.
// http://wiibrew.org/wiki/Wii_Disc#Encrypted
}
// Copy the decrypted data
@ -487,9 +478,7 @@ bool VolumeWii::CheckBlockIntegrity(u64 block_index, const std::vector<u8>& encr
encrypted_data.data(), reinterpret_cast<u8*>(&hashes));
u8 cluster_data[BLOCK_DATA_SIZE];
std::memcpy(iv, encrypted_data.data() + 0x3D0, 16);
mbedtls_aes_crypt_cbc(aes_context, MBEDTLS_AES_DECRYPT, sizeof(cluster_data), iv,
encrypted_data.data() + sizeof(HashBlock), cluster_data);
DecryptBlockData(encrypted_data.data(), cluster_data, aes_context);
for (u32 hash_index = 0; hash_index < 31; ++hash_index)
{
@ -671,4 +660,12 @@ bool VolumeWii::EncryptGroup(
return true;
}
void VolumeWii::DecryptBlockData(const u8* in, u8* out, mbedtls_aes_context* aes_context)
{
std::array<u8, 16> iv;
std::copy(&in[0x3d0], &in[0x3e0], iv.data());
mbedtls_aes_crypt_cbc(aes_context, MBEDTLS_AES_DECRYPT, BLOCK_DATA_SIZE, iv.data(),
&in[BLOCK_HEADER_SIZE], out);
}
} // namespace DiscIO