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CONFIG_CRYPTO_CHACHA20: ChaCha stream cipher algorithms

General informations

The Linux kernel configuration item CONFIG_CRYPTO_CHACHA20 has multiple definitions:

ChaCha stream cipher algorithms found in crypto/Kconfig

The configuration item CONFIG_CRYPTO_CHACHA20:

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: http://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:

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

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