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pl_u, applets/web: Decrypt shared fonts to TTF files

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This commit is contained in:
Morph
2020-11-29 10:54:09 -05:00
parent 46183294b2
commit d46ca5a015
3 changed files with 117 additions and 18 deletions
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30
src/core/hle/service/ns/pl_u.cpp
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@@ -27,29 +27,11 @@
namespace Service::NS {
enum class FontArchives : u64 {
Extension = 0x0100000000000810,
Standard = 0x0100000000000811,
Korean = 0x0100000000000812,
ChineseTraditional = 0x0100000000000813,
ChineseSimple = 0x0100000000000814,
};
struct FontRegion {
u32 offset;
u32 size;
};
constexpr std::array<std::pair<FontArchives, const char*>, 7> SHARED_FONTS{
std::make_pair(FontArchives::Standard, "nintendo_udsg-r_std_003.bfttf"),
std::make_pair(FontArchives::ChineseSimple, "nintendo_udsg-r_org_zh-cn_003.bfttf"),
std::make_pair(FontArchives::ChineseSimple, "nintendo_udsg-r_ext_zh-cn_003.bfttf"),
std::make_pair(FontArchives::ChineseTraditional, "nintendo_udjxh-db_zh-tw_003.bfttf"),
std::make_pair(FontArchives::Korean, "nintendo_udsg-r_ko_003.bfttf"),
std::make_pair(FontArchives::Extension, "nintendo_ext_003.bfttf"),
std::make_pair(FontArchives::Extension, "nintendo_ext2_003.bfttf"),
};
// The below data is specific to shared font data dumped from Switch on f/w 2.2
// Virtual address and offsets/sizes likely will vary by dump
[[maybe_unused]] constexpr VAddr SHARED_FONT_MEM_VADDR{0x00000009d3016000ULL};
@@ -80,6 +62,18 @@ static void DecryptSharedFont(const std::vector<u32>& input, Kernel::PhysicalMem
offset += transformed_font.size() * sizeof(u32);
}
void DecryptSharedFontToTTF(const std::vector<u32>& input, std::vector<u8>& output) {
ASSERT_MSG(input[0] == EXPECTED_MAGIC, "Failed to derive key, unexpected magic number");
const u32 KEY = input[0] ^ EXPECTED_RESULT; // Derive key using an inverse xor
std::vector<u32> transformed_font(input.size());
// TODO(ogniK): Figure out a better way to do this
std::transform(input.begin(), input.end(), transformed_font.begin(),
[&KEY](u32 font_data) { return Common::swap32(font_data ^ KEY); });
transformed_font[1] = Common::swap32(transformed_font[1]) ^ KEY; // "re-encrypt" the size
std::memcpy(output.data(), transformed_font.data() + 2, transformed_font.size() * sizeof(u32));
}
void EncryptSharedFont(const std::vector<u32>& input, std::vector<u8>& output,
std::size_t& offset) {
ASSERT_MSG(offset + (input.size() * sizeof(u32)) < SHARED_FONT_MEM_SIZE,

19
src/core/hle/service/ns/pl_u.h
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@@ -16,6 +16,25 @@ class FileSystemController;
namespace NS {
enum class FontArchives : u64 {
Extension = 0x0100000000000810,
Standard = 0x0100000000000811,
Korean = 0x0100000000000812,
ChineseTraditional = 0x0100000000000813,
ChineseSimple = 0x0100000000000814,
};
constexpr std::array<std::pair<FontArchives, const char*>, 7> SHARED_FONTS{
std::make_pair(FontArchives::Standard, "nintendo_udsg-r_std_003.bfttf"),
std::make_pair(FontArchives::ChineseSimple, "nintendo_udsg-r_org_zh-cn_003.bfttf"),
std::make_pair(FontArchives::ChineseSimple, "nintendo_udsg-r_ext_zh-cn_003.bfttf"),
std::make_pair(FontArchives::ChineseTraditional, "nintendo_udjxh-db_zh-tw_003.bfttf"),
std::make_pair(FontArchives::Korean, "nintendo_udsg-r_ko_003.bfttf"),
std::make_pair(FontArchives::Extension, "nintendo_ext_003.bfttf"),
std::make_pair(FontArchives::Extension, "nintendo_ext2_003.bfttf"),
};
void DecryptSharedFontToTTF(const std::vector<u32>& input, std::vector<u8>& output);
void EncryptSharedFont(const std::vector<u32>& input, std::vector<u8>& output, std::size_t& offset);
class PL_U final : public ServiceFramework<PL_U> {