From: Eric Biggers Date: Sat, 17 Nov 2018 01:26:26 +0000 (-0800) Subject: FROMGIT: crypto: arm/chacha - add XChaCha12 support X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=398ff9d18d706a03e6bdf9dd566a14f2e3a8773c;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git FROMGIT: crypto: arm/chacha - add XChaCha12 support Now that the 32-bit ARM 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. XChaCha12 is faster than XChaCha20 but has a lower security margin, though still greater than AES-256's since the best known attacks make it through only 7 rounds. See the patch "crypto: chacha - add XChaCha12 support" for more details about why we need XChaCha12 support. Reviewed-by: Ard Biesheuvel Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu (cherry picked from commit bdb063a79f6da589af1de3f10a7c8f654fba9ae8 https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master) Bug: 112008522 Test: As series, see Ic61c13b53facfd2173065be715a7ee5f3af8760b Change-Id: I08fba7f6f8bc9f1d08a75f5e6f6b73ceba6b8109 Signed-off-by: Eric Biggers --- diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig index 686eae8c9355..8284a40edf5a 100644 --- a/arch/arm/crypto/Kconfig +++ b/arch/arm/crypto/Kconfig @@ -125,7 +125,7 @@ config CRYPTO_CRC32_ARM_CE select CRYPTO_HASH config CRYPTO_CHACHA20_NEON - tristate "NEON accelerated ChaCha20 stream cipher algorithms" + tristate "NEON accelerated ChaCha stream cipher algorithms" depends on KERNEL_MODE_NEON select CRYPTO_BLKCIPHER select CRYPTO_CHACHA20 diff --git a/arch/arm/crypto/chacha-neon-glue.c b/arch/arm/crypto/chacha-neon-glue.c index 385557d38634..9d6fda81986d 100644 --- a/arch/arm/crypto/chacha-neon-glue.c +++ b/arch/arm/crypto/chacha-neon-glue.c @@ -1,5 +1,6 @@ /* - * ChaCha20 (RFC7539) and XChaCha20 stream ciphers, NEON accelerated + * ARM NEON accelerated ChaCha and XChaCha stream ciphers, + * including ChaCha20 (RFC7539) * * Copyright (C) 2016 Linaro, Ltd. * @@ -154,6 +155,22 @@ 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, } }; @@ -180,3 +197,5 @@ 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");