[RFC PATCH 03/20] crypto: arm64/chacha - expose arm64 ChaCha routine as library function
STALE2560d
From: Ard Biesheuvel <hidden>
Date: 2019-09-29 17:39:07
Also in:
linux-crypto
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Expose the accelerated NEON ChaCha routine directly as a symbol export so that users of the ChaCha library can use it directly. Signed-off-by: Ard Biesheuvel <redacted> --- arch/arm64/crypto/Kconfig | 1 + arch/arm64/crypto/chacha-neon-glue.c | 12 ++++++++++++ 2 files changed, 13 insertions(+)
diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
index 4922c4451e7c..09aa69ccc792 100644
--- a/arch/arm64/crypto/Kconfig
+++ b/arch/arm64/crypto/Kconfig@@ -104,6 +104,7 @@ config CRYPTO_CHACHA20_NEON depends on KERNEL_MODE_NEON select CRYPTO_BLKCIPHER select CRYPTO_CHACHA20 + select CRYPTO_ARCH_HAVE_LIB_CHACHA config CRYPTO_NHPOLY1305_NEON tristate "NHPoly1305 hash function using NEON instructions (for Adiantum)"
diff --git a/arch/arm64/crypto/chacha-neon-glue.c b/arch/arm64/crypto/chacha-neon-glue.c
index d4cc61bfe79d..26c12b19a4ad 100644
--- a/arch/arm64/crypto/chacha-neon-glue.c
+++ b/arch/arm64/crypto/chacha-neon-glue.c@@ -59,6 +59,18 @@ static void chacha_doneon(u32 *state, u8 *dst, const u8 *src, } } +void chacha_crypt(u32 *state, u8 *dst, const u8 *src, unsigned int bytes, + int nrounds) +{ + if (bytes <= CHACHA_BLOCK_SIZE || !crypto_simd_usable()) + return chacha_crypt_generic(state, dst, src, bytes, nrounds); + + kernel_neon_begin(); + chacha_doneon(state, dst, src, bytes, nrounds); + kernel_neon_end(); +} +EXPORT_SYMBOL(chacha_crypt); + static int chacha_neon_stream_xor(struct skcipher_request *req, const struct chacha_ctx *ctx, const u8 *iv) {
--
2.17.1
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