CONFIG_CRYPTO_CHACHA20: ChaCha

General informations

The Linux kernel configuration item CONFIG_CRYPTO_CHACHA20 has multiple definitions:

ChaCha found in crypto/Kconfig

The configuration item CONFIG_CRYPTO_CHACHA20:

• prompt: ChaCha
• type: tristate
• depends on: (none)
• defined in crypto/Kconfig
• found in Linux kernels: 6.1–6.8, 6.9-rc+HEAD
• modules built: chacha20_generic, chacha_generic

Help text

The ChaCha20, XChaCha20, and XChaCha12 stream cipher algorithms

ChaCha20 is a 256-bit high-speed stream cipher designed by Daniel J. Bernstein and further specified in RFC7539 for use in IETF protocols. This is the portable C implementation of ChaCha20. See https://cr.yp.to/chacha/chacha-20080128.pdf for further information.

XChaCha20 is the application of the XSalsa20 construction to ChaCha20 rather than to Salsa20. XChaCha20 extends ChaCha20's nonce length from 64 bits (or 96 bits using the RFC7539 convention) to 192 bits, while provably retaining ChaCha20's security. See https://cr.yp.to/snuffle/xsalsa-20081128.pdf for further information.

XChaCha12 is XChaCha20 reduced to 12 rounds, with correspondingly reduced security margin but increased performance. It can be needed in some performance-sensitive scenarios.

ChaCha stream cipher algorithms found in crypto/Kconfig

The configuration item CONFIG_CRYPTO_CHACHA20:

• prompt: ChaCha stream cipher algorithms
• type: tristate
• depends on: (none)
• defined in crypto/Kconfig
• found in Linux kernels: 5.0–5.19, 6.0, 6.0+HEAD
• modules built: chacha20_generic, chacha_generic

Help text

The ChaCha20, XChaCha20, and XChaCha12 stream cipher algorithms.

ChaCha20 is a 256-bit high-speed stream cipher designed by Daniel J. Bernstein and further specified in RFC7539 for use in IETF protocols. This is the portable C implementation of ChaCha20. See also: https://cr.yp.to/chacha/chacha-20080128.pdf

XChaCha20 is the application of the XSalsa20 construction to ChaCha20 rather than to Salsa20. XChaCha20 extends ChaCha20's nonce length from 64 bits (or 96 bits using the RFC7539 convention) to 192 bits, while provably retaining ChaCha20's security. See also: https://cr.yp.to/snuffle/xsalsa-20081128.pdf

XChaCha12 is XChaCha20 reduced to 12 rounds, with correspondingly reduced security margin but increased performance. It can be needed in some performance-sensitive scenarios.

ChaCha20 cipher algorithm found in crypto/Kconfig

The configuration item CONFIG_CRYPTO_CHACHA20:

• prompt: ChaCha20 cipher algorithm
• type: tristate
• depends on: (none)
• defined in crypto/Kconfig
• found in Linux kernels: 4.2–4.20
• modules built: chacha20_generic, chacha_generic

Help text

ChaCha20 cipher algorithm, RFC7539.

ChaCha20 is a 256-bit high-speed stream cipher designed by Daniel J. Bernstein and further specified in RFC7539 for use in IETF protocols. This is the portable C implementation of ChaCha20.

See also: http://cr.yp.to/chacha/chacha-20080128.pdf

Hardware

LKDDb

Raw data from LKDDb:

• lkddb module chacha20_generic CONFIG_CRYPTO_CHACHA20 : crypto/Kconfig : "ChaCha20 cipher algorithm" # in 4.2–4.20
• lkddb module chacha_generic CONFIG_CRYPTO_CHACHA20 : crypto/Kconfig : "ChaCha" # in 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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