Commit 7a507d62 authored by Eric Biggers's avatar Eric Biggers Committed by Herbert Xu
Browse files

crypto: x86/chacha - add XChaCha12 support 



Now that the x86_64 SIMD implementations of ChaCha20 and XChaCha20 have
been refactored to support varying the number of rounds, add support for
XChaCha12.  This is identical to XChaCha20 except for the number of
rounds, which is 12 instead of 20.  This can be used by Adiantum.

Reviewed-by: default avatarMartin Willi <martin@strongswan.org>
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 8b65f34c

arch/x86/crypto/chacha_glue.c

+17 −0
Original line number Diff line number Diff line
@@ -232,6 +232,21 @@ static struct skcipher_alg algs[] = { 
		.setkey			= crypto_chacha20_setkey,

		.encrypt		= xchacha_simd,

		.decrypt		= xchacha_simd,

	}, {

		.base.cra_name		= "xchacha12",

		.base.cra_driver_name	= "xchacha12-simd",

		.base.cra_priority	= 300,

		.base.cra_blocksize	= 1,

		.base.cra_ctxsize	= sizeof(struct chacha_ctx),

		.base.cra_module	= THIS_MODULE,



		.min_keysize		= CHACHA_KEY_SIZE,

		.max_keysize		= CHACHA_KEY_SIZE,

		.ivsize			= XCHACHA_IV_SIZE,

		.chunksize		= CHACHA_BLOCK_SIZE,

		.setkey			= crypto_chacha12_setkey,

		.encrypt		= xchacha_simd,

		.decrypt		= xchacha_simd,

	},

};
@@ -268,3 +283,5 @@ MODULE_ALIAS_CRYPTO("chacha20"); 
MODULE_ALIAS_CRYPTO("chacha20-simd");

MODULE_ALIAS_CRYPTO("xchacha20");

MODULE_ALIAS_CRYPTO("xchacha20-simd");

MODULE_ALIAS_CRYPTO("xchacha12");

MODULE_ALIAS_CRYPTO("xchacha12-simd");

crypto/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -1473,8 +1473,8 @@ config CRYPTO_CHACHA20_X86_64 
	select CRYPTO_BLKCIPHER

	select CRYPTO_CHACHA20

	help

	  SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20

	  and XChaCha20 stream ciphers.

	  SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20,

	  XChaCha20, and XChaCha12 stream ciphers.



config CRYPTO_SEED

	tristate "SEED cipher algorithm"

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