fix: incorrect str fmt

src/unlocker/dbdcrypt.cpp

@@ -112,6 +112,8 @@ std::string DBDCrypt::decType1(const std::string& data, const std::string& key,
     std::vector<uint8_t> body(decoded.begin() + 4, decoded.end());
     std::string decompressed = zlibDecompress(body);
 
+    if (decompressed.length() >= 2 && decompressed[1] == '\0') decompressed = utf16ToUtf8(decompressed);
+
     if (decompressed.starts_with("DbdD")) return decrypt(decompressed, key, outType);
     return decompressed;
 }
@@ -133,10 +135,11 @@ std::string DBDCrypt::decType2(const std::string& data, const std::string& key,
     for (char& c : decrypted)
         c = (char)((unsigned char)c + 1);
 
+    if (decrypted.length() >= 2 && decrypted[1] == '\0') decrypted = utf16ToUtf8(decrypted);
+
     decrypted.erase(std::remove(decrypted.begin(), decrypted.end(), (char)0x01), decrypted.end());
     decrypted.erase(std::remove(decrypted.begin(), decrypted.end(), (char)0x00), decrypted.end());
 
-
     for (size_t offset : {0ULL, 4ULL})
     {
         if (offset + 1 < decrypted.size() && (unsigned char)decrypted[offset] == 0x78)
@@ -175,6 +178,9 @@ std::string DBDCrypt::decType3(const std::string& data, const std::string& key,
     for (char& c : decrypted)
         c = (char)((unsigned char)c + 1);
 
+    if (decrypted.length() >= 2 && decrypted.at(1) == '\0')
+        decrypted = utf16ToUtf8(decrypted);
+
     decrypted.erase(std::remove(decrypted.begin(), decrypted.end(), (char)0x01), decrypted.end());
     decrypted.erase(std::remove(decrypted.begin(), decrypted.end(), (char)0x00), decrypted.end());
 
@@ -389,3 +395,28 @@ std::string DBDCrypt::shiftKeyID(const std::string& id, int shift)
         c = (char)((unsigned char)c + shift);
     return res;
 }
+
+std::string DBDCrypt::utf16ToUtf8(const std::string& utf16)
+{
+    if (utf16.empty()) return "";
+    std::string utf8;
+    for (size_t i = 0; i < utf16.length(); i += 2)
+    {
+        uint16_t cp = *(uint16_t*)(utf16.data() + i);
+        if (cp == 0) break;
+        if (cp < 0x80)
+            utf8 += (char)cp;
+        else if (cp < 0x800)
+        {
+            utf8 += (char)(0xC0 | (cp >> 6));
+            utf8 += (char)(0x80 | (cp & 0x3F));
+        }
+        else
+        {
+            utf8 += (char)(0xE0 | (cp >> 12));
+            utf8 += (char)(0x80 | ((cp >> 6) & 0x3F));
+            utf8 += (char)(0x80 | (cp & 0x3F));
+        }
+    }
+    return utf8;
+}

src/unlocker/dbdcrypt.h

@@ -46,4 +46,6 @@ class DBDCrypt
 
         static std::vector<uint8_t> transformCDNKey(const std::string& b64CDNKey);
         static std::string shiftKeyID(const std::string& id, int shift);
+        static std::string utf16ToUtf8(const std::string& utf16);
+
 };