#### Beyond Linux® From Scratch (System V Edition) - Version 12.3

### Chapter 4. Security

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# cryptsetup-2.7.5

## 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 12.3 platform.

### Package Information

- Download (HTTP): https://www.kernel.org/pub/linux/utils/cryptsetup/v2.7/cryptsetup-2.7.5.tar.xz

- Download MD5 sum: f663f37dd478484f61ace54902c17274

- Download size: 11 MB

- Estimated disk space required: 33 MB (add 5 MB for tests)

- Estimated build time: 0.2 SBU (add 8.1 SBU for tests)

### cryptsetup Dependencies

#### Required

JSON-C-0.18, LVM2-2.03.30, 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 asciidoctor-2.0.23 installed and wish to regenerate the man pages. Note that even if this switch is used, the pre-generated man pages are shipped in the tarball and they'll still be installed.

## Configuring cryptsetup

Because of the number of possible configurations, setup of encrypted volumes is beyond the scope of the BLFS book. Please see the configuration guide in the cryptsetup FAQ.

## Contents

Installed Programs: cryptsetup, cryptsetup-reencrypt, integritysetup, and veritysetup
Installed Libraries: libcryptsetup.so
Installed Directories: None

### Short Descriptions

cryptsetup | is used to setup dm-crypt managed device-mapper mappings
cryptsetup-reencrypt | is a tool for offline LUKS device re-encryption
integritysetup | is a tool to manage dm-integrity (block level integrity) volumes
veritysetup | is used to configure dm-verity managed device-mapper mappings. The Device-mapper verity target provides read-only transparent integrity checking of block devices using the kernel crypto API

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