diff --git a/src/KeyKeeper/PasswordStore/FileFormatConstants.cs b/src/KeyKeeper/PasswordStore/FileFormatConstants.cs
index c45e49e..71bf840 100644
--- a/src/KeyKeeper/PasswordStore/FileFormatConstants.cs
+++ b/src/KeyKeeper/PasswordStore/FileFormatConstants.cs
@@ -12,4 +12,23 @@ static class FileFormatConstants
     public const byte ENCRYPT_ALGO_AES = 14;
     public const byte KDF_TYPE_AESKDF = 195;
     public const int HMAC_SIZE = HMACSHA3_512.HashSizeInBytes;
+    public const uint FILE_FIELD_BEGIN = 0x7853dbd5;
+    public const uint FILE_FIELD_INNER_CRYPTO = 0x613e91e4;
+    public const uint FILE_FIELD_CONFIG = 0xd36a53c0;
+    public const uint FILE_FIELD_STORE = 0x981f9bc8;
+    public const uint FILE_FIELD_END = 0x010ba81a;
+    public const byte ENTRY_PASS_ID = 0x00;
+    public const byte ENTRY_GROUP_ID = 0x01;
+    public const byte LOGIN_FIELD_PASSWORD_ID = 0x00;
+    public const byte LOGIN_FIELD_USERNAME_ID = 0x01;
+    public const byte LOGIN_FIELD_EMAIL_ID = 0x02;
+    public const byte LOGIN_FIELD_ACCOUNT_NUMBER_ID = 0x03;
+    public const byte LOGIN_FIELD_NOTES_ID = 0x04;
+    public const byte LOGIN_FIELD_CUSTOM_ID = 0xff; // пока не используется
+    public const byte GROUP_TYPE_ROOT = 0x00;
+    public const byte GROUP_TYPE_DEFAULT = 0x01;
+    public const byte GROUP_TYPE_FAVOURITES = 0x02;
+    public const byte GROUP_TYPE_SIMPLE = 0x03;
+    public const byte GROUP_TYPE_CUSTOM = 0xff; // пока не используется
+    public static readonly byte[] BEGIN_MARKER = [0x5f, 0x4f, 0xcf, 0x67, 0xc0, 0x90, 0xd0];
 }
\ No newline at end of file