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crypto: x86/chacha20 - add XChaCha20 support

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Add an XChaCha20 implementation that is hooked up to the x86_64 SIMD
implementations of ChaCha20.  This can be used by Adiantum.

An SSSE3 implementation of single-block HChaCha20 is also added so that
XChaCha20 can use it rather than the generic implementation.  This
required refactoring the ChaCha permutation into its own function.

Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Eric Biggers 2018-12-04 22:20:02 -08:00 • committed by Herbert Xu
commit 4af7826187
3 changed files with 141 additions and 60 deletions
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12
crypto/Kconfig
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@ -1468,19 +1468,13 @@ config CRYPTO_CHACHA20
in some performance-sensitive scenarios.
config CRYPTO_CHACHA20_X86_64
tristate "ChaCha20 cipher algorithm (x86_64/SSSE3/AVX2)"
tristate "ChaCha stream cipher algorithms (x86_64/SSSE3/AVX2/AVX-512VL)"
depends on X86 && 64BIT
select CRYPTO_BLKCIPHER
select CRYPTO_CHACHA20
help
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 x86_64 assembler implementation using SIMD instructions.
See also:
<http://cr.yp.to/chacha/chacha-20080128.pdf>
SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20
and XChaCha20 stream ciphers.
config CRYPTO_SEED
tristate "SEED cipher algorithm"