This patch exposes the crypto API x86 chacha20 implementation through zinc. Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> --- lib/zinc/Kconfig | 1 lib/zinc/chacha20/chacha20-x86_64-glue.c | 55 +++++++++++++++++++++++++++++++ lib/zinc/chacha20/chacha20.c | 4 ++ 3 files changed, 60 insertions(+) diff --git a/lib/zinc/Kconfig b/lib/zinc/Kconfig index 1fffd0a1a74c..010547fa6c9d 100644 --- a/lib/zinc/Kconfig +++ b/lib/zinc/Kconfig @@ -1,6 +1,7 @@ config ZINC_CHACHA20 tristate select CRYPTO_CHACHA20 + select CRYPTO_CHACHA20_X86_64 if ZINC_ARCH_X86_64 config ZINC_SELFTEST bool "Zinc cryptography library self-tests" diff --git a/lib/zinc/chacha20/chacha20-x86_64-glue.c b/lib/zinc/chacha20/chacha20-x86_64-glue.c new file mode 100644 index 000000000000..07f72729a64e --- /dev/null +++ b/lib/zinc/chacha20/chacha20-x86_64-glue.c @@ -0,0 +1,55 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@xxxxxxxxx>. All Rights Reserved. + */ + +#include <asm/fpu/api.h> +#include <asm/cpufeature.h> +#include <asm/processor.h> +#include <asm/intel-family.h> +#include <crypto/chacha20.h> + +static bool chacha20_use_ssse3 __ro_after_init; +static bool *const chacha20_nobs[] __initconst = { + &chacha20_use_ssse3 }; + +static void __init chacha20_fpu_init(void) +{ + chacha20_use_ssse3 = boot_cpu_has(X86_FEATURE_SSSE3); +} + +static inline bool chacha20_arch(struct chacha20_ctx *ctx, u8 *dst, + const u8 *src, size_t len, + simd_context_t *simd_context) +{ + /* SIMD disables preemption, so relax after processing each page. */ + BUILD_BUG_ON(PAGE_SIZE < CHACHA20_BLOCK_SIZE || + PAGE_SIZE % CHACHA20_BLOCK_SIZE); + + if (!IS_ENABLED(CONFIG_AS_SSSE3) || !chacha20_use_ssse3 || + len <= CHACHA20_BLOCK_SIZE || !simd_use(simd_context)) + return false; + + for (;;) { + const size_t bytes = min_t(size_t, len, PAGE_SIZE); + + crypto_chacha20_dosimd(ctx->state, dst, src, bytes); + + len -= bytes; + if (!len) + break; + dst += bytes; + src += bytes; + simd_relax(simd_context); + } + + return true; +} + +static inline bool hchacha20_arch(u32 derived_key[CHACHA20_KEY_WORDS], + const u8 nonce[HCHACHA20_NONCE_SIZE], + const u8 key[HCHACHA20_KEY_SIZE], + simd_context_t *simd_context) +{ + return false; +} diff --git a/lib/zinc/chacha20/chacha20.c b/lib/zinc/chacha20/chacha20.c index 132850d19e39..480d304cd917 100644 --- a/lib/zinc/chacha20/chacha20.c +++ b/lib/zinc/chacha20/chacha20.c @@ -17,6 +17,9 @@ #include <crypto/algapi.h> // For crypto_xor_cpy. #include <crypto/chacha20.h> +#if defined(CONFIG_ZINC_ARCH_X86_64) +#include "chacha20-x86_64-glue.c" +#else static bool *const chacha20_nobs[] __initconst = { }; static void __init chacha20_fpu_init(void) { @@ -34,6 +37,7 @@ static inline bool hchacha20_arch(u32 derived_key[CHACHA20_KEY_WORDS], { return false; } +#endif void chacha20(struct chacha20_ctx *ctx, u8 *dst, const u8 *src, u32 len, simd_context_t *simd_context)
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