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[RFC,03/20] crypto: arm64/chacha - expose arm64 ChaCha routine as library function

Message ID 20190929173850.26055-4-ard.biesheuvel@linaro.org
State New
Headers show
Series crypto: wireguard with crypto API library interface | expand

Commit Message

Ard Biesheuvel Sept. 29, 2019, 5:38 p.m. UTC 
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 <ard.biesheuvel@linaro.org>

---
 arch/arm64/crypto/Kconfig            |  1 +
 arch/arm64/crypto/chacha-neon-glue.c | 12 ++++++++++++
 2 files changed, 13 insertions(+)

-- 
2.17.1
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Patch

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)
 {