Method LoadMetadata

rpcs3/Crypto/unself.cpp:623–687

}

bool SCEDecrypter::LoadMetadata(const u8 erk[32], const u8 riv[16])
{
	aes_context aes;
	const auto metadata_info = std::make_unique<u8[]>(sizeof(meta_info));
	const auto metadata_headers_size = sce_hdr.se_hsize - (sizeof(sce_hdr) + sce_hdr.se_meta + sizeof(meta_info));
	const auto metadata_headers = std::make_unique<u8[]>(metadata_headers_size);

	// Locate and read the encrypted metadata info.
	sce_f.seek(sce_hdr.se_meta + sizeof(sce_hdr));
	sce_f.read(metadata_info.get(), sizeof(meta_info));

	// Locate and read the encrypted metadata header and section header.
	sce_f.seek(sce_hdr.se_meta + sizeof(sce_hdr) + sizeof(meta_info));
	sce_f.read(metadata_headers.get(), metadata_headers_size);

	// Copy the necessary parameters.
	u8 metadata_key[0x20];
	u8 metadata_iv[0x10];
	memcpy(metadata_key, erk, 0x20);
	memcpy(metadata_iv, riv, 0x10);

	// Check DEBUG flag.
	if ((sce_hdr.se_flags & 0x8000) != 0x8000)
	{
		// Decrypt the metadata info.
		aes_setkey_dec(&aes, metadata_key, 256); // AES-256
		aes_crypt_cbc(&aes, AES_DECRYPT, sizeof(meta_info), metadata_iv, metadata_info.get(), metadata_info.get());
	}

	// Load the metadata info.
	meta_info.Load(metadata_info.get());

	// If the padding is not NULL for the key or iv fields, the metadata info
	// is not properly decrypted.
	if ((meta_info.key_pad[0] != 0x00) ||
		(meta_info.iv_pad[0] != 0x00))
	{
		self_log.error("Failed to decrypt SCE metadata info!");
		return false;
	}

	// Perform AES-CTR encryption on the metadata headers.
	usz ctr_nc_off = 0;
	u8 ctr_stream_block[0x10];
	aes_setkey_enc(&aes, meta_info.key, 128);
	aes_crypt_ctr(&aes, metadata_headers_size, &ctr_nc_off, meta_info.iv, ctr_stream_block, metadata_headers.get(), metadata_headers.get());

	// Load the metadata header.
	meta_hdr.Load(metadata_headers.get());

	// Load the metadata section headers.
	meta_shdr.clear();
	for (unsigned int i = 0; i < meta_hdr.section_count; i++)
	{
		meta_shdr.emplace_back();
		meta_shdr.back().Load(metadata_headers.get() + sizeof(meta_hdr) + sizeof(MetadataSectionHeader) * i);
	}