[Bug] Unable to open databases (`DatabaseIntegrity(InvalidOuterHeaderEntry { entry_type: 12 })`)

[66BA9Q-ME49]

OS: Windows 11
Database format: KDBX4
Encryption algorithm: AES-256
KDF: Argon2id
Compression: Enabled

I commonly use KeePassXC and KeePassDX to open the databases, but standard KeePass can also open them.

~ > keepass-diff --same-password "<database1>.kdbx" "<database2>.kdbx"
Password for both files:


thread 'main' panicked at C:\Users\<username>\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\keepass-diff-1.2.0\src\main.rs:122:18:
Error opening database A: DatabaseIntegrity(InvalidOuterHeaderEntry { entry_type: 12 })
stack backtrace:
   0:     0x7ff62ca62402 - <unknown>
   1:     0x7ff62ca7174b - <unknown>
   2:     0x7ff62ca604f7 - <unknown>
   3:     0x7ff62ca62245 - <unknown>
   4:     0x7ff62ca63d2c - <unknown>
   5:     0x7ff62ca63ac2 - <unknown>
   6:     0x7ff62ca6490f - <unknown>
   7:     0x7ff62ca646a9 - <unknown>
   8:     0x7ff62ca62b0f - <unknown>
   9:     0x7ff62ca642ae - <unknown>
  10:     0x7ff62ca7f101 - <unknown>
  11:     0x7ff62ca7f480 - <unknown>
  12:     0x7ff62c96d0b6 - <unknown>
  13:     0x7ff62c9842a6 - <unknown>
  14:     0x7ff62c9869dc - <unknown>
  15:     0x7ff62ca5aa0c - <unknown>
  16:     0x7ff62c97802c - <unknown>
  17:     0x7ff62ca764e0 - <unknown>
  18:     0x7ff8d963dbe7 - BaseThreadInitThunk
  19:     0x7ff8dad25a6c - RtlUserThreadStart

[mlavi]

Working databases created with KeePassXC.org default setting, I get the same error on Linux.
Now I see #81 , I will try to recompile with something up to date and report back later.

OS: Linux Mint 22.2 (x86-64)
Database format: KDBX4
Encryption algorithm: AES-256
KDF: Argon2d
Compression: Enabled

$ rustc --version
rustc 1.75.0 (82e1608df 2023-12-21) (built from a source tarball)

$ keepass-diff --version
keepass-diff 1.2.0

$ RUST_BACKTRACE=full keepass-diff --same-password Mark-Professional.kdbx Mark-Professional.old.kdbx 
Password for both files: 

thread 'main' panicked at /home/mint22/.cargo/registry/src/index.crates.io-6f17d22bba15001f/keepass-diff-1.2.0/src/main.rs:122:18:
Error opening database A: DatabaseIntegrity(InvalidOuterHeaderEntry { entry_type: 12 })
stack backtrace:
0: 0x55bc9275db9b - std::backtrace_rs::backtrace::libunwind::trace::he991e66e5f22a1db
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
1: 0x55bc9275db9b - std::backtrace_rs::backtrace::trace_unsynchronized::h43f35a5576eecb13
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x55bc9275db9b - std::sys_common::backtrace::_print_fmt::hf9c799a68b2477fc
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/sys_common/backtrace.rs:67:5
3: 0x55bc9275db9b - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf2d48dfeb5948660
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/sys_common/backtrace.rs:44:22
4: 0x55bc92799b70 - core::fmt::rt::Argument::fmt::h507ca91fbb1ef494
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/core/src/fmt/rt.rs:142:9
5: 0x55bc92799b70 - core::fmt::write::h4d5f6025aa566322
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/core/src/fmt/mod.rs:1120:17
6: 0x55bc9275a9ad - std::io::Write::write_fmt::hc088b3c8cc6dcb9f
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/io/mod.rs:1762:15
7: 0x55bc9275d984 - std::sys_common::backtrace::_print::h231201f6cff8f56a
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/sys_common/backtrace.rs:47:5
8: 0x55bc9275d984 - std::sys_common::backtrace::print::h478d6be486f8cd2d
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/sys_common/backtrace.rs:34:9
9: 0x55bc9277a39a - std::panicking::default_hook::{{closure}}::hf1c55106b4d45a90
10: 0x55bc9277a03d - std::panicking::default_hook::h7b29000c631cc719
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panicking.rs:292:9
11: 0x55bc9277a7b8 - std::panicking::rust_panic_with_hook::h2a988919dd121561
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panicking.rs:779:13
12: 0x55bc9275df7e - std::panicking::begin_panic_handler::{{closure}}::h3a9eaa1d23ecf555
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panicking.rs:657:13
13: 0x55bc9275ddb6 - std::sys_common::backtrace::__rust_end_short_backtrace::h813561fdec15f700
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/sys_common/backtrace.rs:170:18
14: 0x55bc9277a4e2 - rust_begin_unwind
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panicking.rs:645:5
15: 0x55bc9267af35 - core::panicking::panic_fmt::hef0307862026e6f9
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/core/src/panicking.rs:72:14
16: 0x55bc9267b5c3 - core::result::unwrap_failed::h8393ef8d489acb45
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/core/src/result.rs:1653:5
17: 0x55bc92685e9a - keepass_diff::main::h4fc4029bfc1fcf52
18: 0x55bc92697193 - std::sys_common::backtrace::__rust_begin_short_backtrace::hbad6332c9b57bc99
19: 0x55bc926973ac - std::rt::lang_start::{{closure}}::h67d5b83664f236e3
20: 0x55bc9277a3d4 - core::ops::function::impls::<impl core::ops::function::FnOnce for &F>::call_once::h2a98286140a8c485
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/core/src/ops/function.rs:284:13
21: 0x55bc9277a3d4 - std::panicking::try::do_call::h6f884a82d660d639
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panicking.rs:552:40
22: 0x55bc9277a3d4 - std::panicking::try::h3d219ee83761ccf8
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panicking.rs:516:19
23: 0x55bc9277a3d4 - std::panic::catch_unwind::h0a8f78f1f5633cdb
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panic.rs:142:14
24: 0x55bc9277a3d4 - std::rt::lang_start_internal::{{closure}}::hd36869a5192571c4
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/rt.rs:148:48
25: 0x55bc9277a3d4 - std::panicking::try::do_call::hbfe6916f1cc74e35
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panicking.rs:552:40
26: 0x55bc9277a3d4 - std::panicking::try::h0cc643a8ace88736
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panicking.rs:516:19
27: 0x55bc9276800b - std::panic::catch_unwind::hd66d6c526b1a6302
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/panic.rs:142:14
28: 0x55bc9276800b - std::rt::lang_start_internal::h8fc8e9636333b06e
at /build/rustc-ntAYxy/rustc-1.75.0+dfsg0ubuntu1/library/std/src/rt.rs:148:20
29: 0x55bc9269739e - std::rt::lang_start::h1cd3487cfc512139
30: 0x779c8242a1ca - __libc_start_call_main
at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
31: 0x779c8242a28b - __libc_start_main_impl
at ./csu/../csu/libc-start.c:360:3
32: 0x55bc9267b6e5 - _start
33: 0x0 -

[mlavi]

Recompiled and --force installed keepass-diff with new compiler:

$ rustc --version
rustc 1.90.0 (1159e78c4 2025-09-14)

RUST_BACKTRACE=full keepass-diff --same-password Mark-Professional.kdbx Mark-Professional.old.kdbx 
Password for both files: 

thread 'main' panicked at /home/mint22/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/keepass-diff-1.2.0/src/main.rs:122:18:
Error opening database A: DatabaseIntegrity(InvalidOuterHeaderEntry { entry_type: 12 })
stack backtrace:
0: 0x603a58698d82 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hdcfcb6d4c8489523
1: 0x603a586b67b3 - core::fmt::write::h8a494366950f23bb
2: 0x603a58696613 - std::io::Write::write_fmt::h6556609fca33d0b1
3: 0x603a58698bd2 - std::sys::backtrace::BacktraceLock::print::hb2a626a81e06b2dc
4: 0x603a58699c73 - std::panicking::default_hook::{{closure}}::h4f78485264f12d10
5: 0x603a58699a55 - std::panicking::default_hook::h2c66fc99e962531d
6: 0x603a5869a645 - std::panicking::rust_panic_with_hook::h33ac55f64bbd807d
7: 0x603a5869a3da - std::panicking::begin_panic_handler::{{closure}}::h30e7cb89678a57fe
8: 0x603a58699289 - std::sys::backtrace::__rust_end_short_backtrace::hed60f27456c16ced
9: 0x603a5869a06d - __rustc[de2ca18b4c54d5b8]::rust_begin_unwind
10: 0x603a586b5780 - core::panicking::panic_fmt::h62f63d096dd276af
11: 0x603a586b5b46 - core::result::unwrap_failed::h95bc3f5a607b2c95
12: 0x603a58595314 - keepass_diff::main::hbcf2c12f4e640405
13: 0x603a585a86a3 - std::sys::backtrace::__rust_begin_short_backtrace::hc25959f6c85ffffc
14: 0x603a585a960c - std::rt::lang_start::{{closure}}::h58c5e2c5041dc696
15: 0x603a58691960 - std::rt::lang_start_internal::h34f9328d113fd60a
16: 0x603a5859cbd5 - main
17: 0x76f75fc2a1ca - __libc_start_call_main
at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
18: 0x76f75fc2a28b - __libc_start_main_impl
at ./csu/../csu/libc-start.c:360:3
19: 0x603a58589465 - _start
20: 0x0 -