Add Tumbleweed LUKS2 Argon2id post

content/post/tumbleweed-luks2.md

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+title = "Tumbleweed with LUKS2 and Argon2"
+date = 2024-03-31T16:01:47+02:00
+draft = false
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+
+The steps below show you how to install openSUSE Tumbleweed with [LUKS2](https://gitlab.com/cryptsetup/LUKS2-docs/blob/main/luks2_doc_wip.pdf) and [Argon2id](https://datatracker.ietf.org/doc/html/rfc9106) as Password-Based Key Derivation Function (PBKDF) when using [systemd-boot](https://news.opensuse.org/2024/03/05/systemd-boot-integration-in-os) instead of GRUB2 as bootloader.
+
+1. Perform an installation with full disk encryption
+1. Select `Guided Setup` during partitioning the disk and use LVM
+    ![Image LVM](/post/tw_luks2/lvm.png)
+1. Change the bootloader by selecting 'Booting' at the top ot the summary screen
+    ![Image summary page](/post/tw_luks2/confirmation.png)
+1. Select `Systemd Boot` as bootloader
+    ![Image systemd-boot](/post/tw_luks2/systemd-boot.png)
+1. After the installation is finished, boot into the rescue system of the installation medium.
+  The LUKS conversion cannot be done while the device is in use.
+    ![Image rescue system 1](/post/tw_luks2/rescue_1.png)
+    ![Image rescue system 2](/post/tw_luks2/rescue_2.png)
+1. Login as `root`
+1. Convert `LUKS1` to `LUKS2` with:
+
+    ```bash
+    cryptsetup convert --type luks2 /dev/sdaX
+    ```
+
+1. Check the result with:
+
+    ```bash
+    $ cryptsetup luksDump /dev/sdaX
+
+    LUKS header information
+    Version:        2
+    Epoch:          4
+    Metadata area:  16384 [bytes]
+    Keyslots area:  2064384 [bytes]
+    UUID:           XXXXXXXXXXXXXXXXXXXXX
+    Label:          (no label)
+    Subsystem:      (no subsystem)
+    Flags:          (no flags)
+
+    Data segments:
+    0: crypt
+            offset: 2097152 [bytes]
+            length: (whole device)
+            cipher: aes-xts-plain64
+            sector: 512 [bytes]
+
+    Keyslots:
+    0: luks2
+            Key:        512 bits
+            Priority:   normal
+            Cipher:     aes-xts-plain64
+            Cipher key: 512 bits
+            PBKDF:      PBKDF2
+            Time cost:  7
+            Memory:     1048576
+            Threads:    4
+            Salt:       XXXXXXXXXXXXXXXXXX
+            AF stripes: 4000
+            AF hash:    sha256
+            Area offset:290816 [bytes]
+            Area length:258048 [bytes]
+            Digest ID:  0
+    Tokens:
+    Digests:
+    0: pbkdf2
+            Hash:       sha256
+            Iterations: 129774
+            Salt:       XXXXXXXXXXXXXXXXXX
+            Digest:     XXXXXXXXXXXXXXXXXX
+    ```
+
+1. Change the PBKDF:
+
+    ```bash
+    cryptsetup luksConvertKey --pbkdf argon2id /dev/sdaX
+    ```
+
+1. Check the result again with:
+
+    ```bash
+    $ cryptsetup luksDump /dev/sdaX
+
+    LUKS header information
+    Version:        2
+    Epoch:          4
+    Metadata area:  16384 [bytes]
+    Keyslots area:  2064384 [bytes]
+    UUID:           XXXXXXXXXXXXXXXXXXXXX
+    Label:          (no label)
+    Subsystem:      (no subsystem)
+    Flags:          (no flags)
+
+    Data segments:
+    0: crypt
+            offset: 2097152 [bytes]
+            length: (whole device)
+            cipher: aes-xts-plain64
+            sector: 512 [bytes]
+
+    Keyslots:
+    0: luks2
+            Key:        512 bits
+            Priority:   normal
+            Cipher:     aes-xts-plain64
+            Cipher key: 512 bits
+            PBKDF:      argon2id
+            Time cost:  7
+            Memory:     1048576
+            Threads:    4
+            Salt:       XXXXXXXXXXXXXXXXXX
+            AF stripes: 4000
+            AF hash:    sha256
+            Area offset:290816 [bytes]
+            Area length:258048 [bytes]
+            Digest ID:  0
+    Tokens:
+    Digests:
+    0: pbkdf2
+            Hash:       sha256
+            Iterations: 129774
+            Salt:       XXXXXXXXXXXXXXXXXX
+            Digest:     XXXXXXXXXXXXXXXXXX
+    ```
+
+1. Reboot into your system
+
+Regarding the used cipher, you can benchmark the available ones with
+
+```bash
+$ cryptsetup benchmark
+
+# Tests are approximate using memory only (no storage IO).
+PBKDF2-sha1      1528536 iterations per second for 256-bit key
+PBKDF2-sha256    2092966 iterations per second for 256-bit key
+PBKDF2-sha512    1546572 iterations per second for 256-bit key
+PBKDF2-ripemd160  897753 iterations per second for 256-bit key
+PBKDF2-whirlpool  691672 iterations per second for 256-bit key
+argon2i       7 iterations, 1048576 memory, 4 parallel threads (CPUs) for 256-bit key (requested 2000 ms time)
+argon2id      7 iterations, 1048576 memory, 4 parallel threads (CPUs) for 256-bit key (requested 2000 ms time)
+#     Algorithm |       Key |      Encryption |      Decryption
+        aes-cbc        128b      1282.2 MiB/s      3857.8 MiB/s
+    serpent-cbc        128b       104.2 MiB/s       820.8 MiB/s
+    twofish-cbc        128b       242.6 MiB/s       435.4 MiB/s
+        aes-cbc        256b       962.9 MiB/s      3095.0 MiB/s
+    serpent-cbc        256b       107.9 MiB/s       819.7 MiB/s
+    twofish-cbc        256b       248.5 MiB/s       426.4 MiB/s
+        aes-xts        256b      3825.8 MiB/s      3821.4 MiB/s
+    serpent-xts        256b       715.6 MiB/s       723.8 MiB/s
+    twofish-xts        256b       388.7 MiB/s       390.9 MiB/s
+        aes-xts        512b      3086.5 MiB/s      3083.5 MiB/s
+    serpent-xts        512b       710.5 MiB/s       710.8 MiB/s
+    twofish-xts        512b       384.4 MiB/s       385.9 MiB/s
+```
+
+and decide if you want a different cipher instead of `aes-xts-plain64`. The results above represent an Intel i7-8665U.