Commit 19c11c97 authored by Eric Biggers's avatar Eric Biggers Committed by Herbert Xu
Browse files

crypto: arm64/chacha - add XChaCha12 support 



Now that the ARM64 NEON implementation of ChaCha20 and XChaCha20 has
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 avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 95a34b77

arch/arm64/crypto/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -101,7 +101,7 @@ config CRYPTO_AES_ARM64_NEON_BLK 
	select CRYPTO_SIMD



config CRYPTO_CHACHA20_NEON

	tristate "ChaCha20 and XChaCha20 stream ciphers using NEON instructions"

	tristate "ChaCha20, XChaCha20, and XChaCha12 stream ciphers using NEON instructions"

	depends on KERNEL_MODE_NEON

	select CRYPTO_BLKCIPHER

	select CRYPTO_CHACHA20

arch/arm64/crypto/chacha-neon-glue.c

+18 −0
Original line number Diff line number Diff line
@@ -161,6 +161,22 @@ static struct skcipher_alg algs[] = { 
		.setkey			= crypto_chacha20_setkey,

		.encrypt		= xchacha_neon,

		.decrypt		= xchacha_neon,

	}, {

		.base.cra_name		= "xchacha12",

		.base.cra_driver_name	= "xchacha12-neon",

		.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,

		.walksize		= 4 * CHACHA_BLOCK_SIZE,

		.setkey			= crypto_chacha12_setkey,

		.encrypt		= xchacha_neon,

		.decrypt		= xchacha_neon,

	}

};
@@ -187,3 +203,5 @@ MODULE_ALIAS_CRYPTO("chacha20"); 
MODULE_ALIAS_CRYPTO("chacha20-neon");

MODULE_ALIAS_CRYPTO("xchacha20");

MODULE_ALIAS_CRYPTO("xchacha20-neon");

MODULE_ALIAS_CRYPTO("xchacha12");

MODULE_ALIAS_CRYPTO("xchacha12-neon");

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