key_manager: Add keyblob support

1 files changed, 10 insertions, 0 deletions

diff --git a/src/core/crypto/key_manager.cpp b/src/core/crypto/key_manager.cpp
index 85776cdcbd..0f1a86d1ee 100644
--- a/src/core/crypto/key_manager.cpp
+++ b/src/core/crypto/key_manager.cpp
@@ -21,6 +21,8 @@
 
 namespace Core::Crypto {
 
+constexpr u64 CURRENT_CRYPTO_REVISION = 0x5;
+
 Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, Key128 key_seed) {
     Key128 out{};
 
@@ -37,6 +39,14 @@ Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, K
     return out;
 }
 
+Key128 DeriveKeyblobKey(Key128 sbk, Key128 tsec, Key128 source) {
+    AESCipher<Key128> sbk_cipher(sbk, Mode::ECB);
+    AESCipher<Key128> tsec_cipher(tsec, Mode::ECB);
+    tsec_cipher.Transcode(source.data(), source.size(), source.data(), Op::Decrypt);
+    sbk_cipher.Transcode(source.data(), source.size(), source.data(), Op::Decrypt);
+    return source;
+}
+
 boost::optional<Key128> DeriveSDSeed() {
     const FileUtil::IOFile save_43(FileUtil::GetUserPath(FileUtil::UserPath::NANDDir) +
                                        "/system/save/8000000000000043",