Beyond Linux® From Scratch (systemd Edition) - Version 12.2

Chapter 4. Security

cryptsetup-2.7.4

Introduction to cryptsetup

cryptsetup is used to set up transparent encryption of block devices using the kernel crypto API.

This package is known to build and work properly using an LFS 12.2 platform.

Package Information

cryptsetup Dependencies

Required

JSON-C-0.17, LVM2-2.03.26, and popt-1.19

Optional

asciidoctor-2.0.23, libpwquality-1.4.5, argon2, libssh, and passwdqc

Kernel Configuration

Encrypted block devices require kernel support. To use it, the appropriate kernel configuration parameters need to be set: 

Device Drivers --->
  [*] Multiple devices driver support (RAID and LVM) --->                   [MD]
    <*/M> Device mapper support                                     [BLK_DEV_DM]
    <*/M>   Crypt target support                                      [DM_CRYPT]

-*- Cryptographic API --->                                              [CRYPTO]
  Block ciphers --->
    <*/M> AES (Advanced Encryption Standard)                        [CRYPTO_AES]
    # For tests:
    <*/M> Twofish                                               [CRYPTO_TWOFISH]
  Length-preserving ciphers and modes --->
    <*/M> XTS (XOR Encrypt XOR with ciphertext stealing)            [CRYPTO_XTS]
  Hashes, digests, and MACs --->
    <*/M> SHA-224 and SHA-256                                    [CRYPTO_SHA256]
  Userspace interface --->
    <*/M> Symmetric key cipher algorithms             [CRYPTO_USER_API_SKCIPHER]

Installation of cryptsetup

Install cryptsetup by running the following commands: 

./configure --prefix=/usr       \
            --disable-ssh-token \
            --disable-asciidoc  &&
make

To test the result, issue as the root user: make check. Some tests will fail if appropriate kernel configuration options are not set. Some additional options that may be needed for tests are: 

CONFIG_SCSI_LOWLEVEL,
CONFIG_SCSI_DEBUG,
CONFIG_BLK_DEV_DM_BUILTIN,
CONFIG_CRYPTO_USER,
CONFIG_CRYPTO_CRYPTD,
CONFIG_CRYPTO_LRW,
CONFIG_CRYPTO_XTS,
CONFIG_CRYPTO_ESSIV,
CONFIG_CRYPTO_CRCT10DIF,
CONFIG_CRYPTO_AES_TI,
CONFIG_CRYPTO_AES_NI_INTEL,
CONFIG_CRYPTO_BLOWFISH,
CONFIG_CRYPTO_CAST5,
CONFIG_CRYPTO_SERPENT,
CONFIG_CRYPTO_SERPENT_SSE2_X86_64,
CONFIG_CRYPTO_SERPENT_AVX_X86_64,
CONFIG_CRYPTO_SERPENT_AVX2_X86_64, and
CONFIG_CRYPTO_TWOFISH_X86_64

Now, as the root user: 

make install

Command Explanations

--disable-ssh-token: This switch is required if the optional libssh dependency is not installed.

--disable-asciidoc: This switch disables regeneration of the man pages. Remove this switch if you have