@@ -306,6 +306,11 @@ config CRYPTO_AEGIS128
help
Support for the AEGIS-128 dedicated AEAD algorithm.
+config CRYPTO_AEGIS128_SIMD
+ bool "Support SIMD acceleration for AEGIS-128"
+ depends on CRYPTO_AEGIS128 && ((ARM || ARM64) && KERNEL_MODE_NEON)
+ default y
+
config CRYPTO_AEGIS128L
tristate "AEGIS-128L AEAD algorithm"
select CRYPTO_AEAD
@@ -91,6 +91,17 @@ obj-$(CONFIG_CRYPTO_CCM) += ccm.o
obj-$(CONFIG_CRYPTO_CHACHA20POLY1305) += chacha20poly1305.o
obj-$(CONFIG_CRYPTO_AEGIS128) += aegis128.o
aegis128-y := aegis128-core.o
+
+ifeq ($(ARCH),arm)
+CFLAGS_aegis128-neon-inner.o += -ffreestanding -march=armv7-a -mfloat-abi=softfp -mfpu=crypto-neon-fp-armv8
+aegis128-$(CONFIG_CRYPTO_AEGIS128_SIMD) += aegis128-neon.o aegis128-neon-inner.o
+endif
+ifeq ($(ARCH),arm64)
+CFLAGS_aegis128-neon-inner.o += -ffreestanding -mcpu=generic+crypto
+CFLAGS_REMOVE_aegis128-neon-inner.o += -mgeneral-regs-only
+aegis128-$(CONFIG_CRYPTO_AEGIS128_SIMD) += aegis128-neon.o aegis128-neon-inner.o
+endif
+
obj-$(CONFIG_CRYPTO_PCRYPT) += pcrypt.o
obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o
obj-$(CONFIG_CRYPTO_DES) += des_generic.o
new file mode 100644
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
+ */
+
+#ifdef CONFIG_ARM64
+#include <asm/neon-intrinsics.h>
+#else
+#include <arm_neon.h>
+#endif
+
+#define AEGIS_BLOCK_SIZE 16
+
+#include <stddef.h>
+
+void *memcpy(void *dest, const void *src, size_t n);
+void *memset(void *s, int c, size_t n);
+
+struct aegis128_state {
+ uint8x16_t v[5];
+};
+
+static struct aegis128_state aegis128_load_state_neon(const void *state)
+{
+ return (struct aegis128_state){ {
+ vld1q_u8(state),
+ vld1q_u8(state + 16),
+ vld1q_u8(state + 32),
+ vld1q_u8(state + 48),
+ vld1q_u8(state + 64)
+ } };
+}
+
+static void aegis128_save_state_neon(struct aegis128_state st, void *state)
+{
+ vst1q_u8(state, st.v[0]);
+ vst1q_u8(state + 16, st.v[1]);
+ vst1q_u8(state + 32, st.v[2]);
+ vst1q_u8(state + 48, st.v[3]);
+ vst1q_u8(state + 64, st.v[4]);
+}
+
+static struct aegis128_state aegis128_update_neon(struct aegis128_state st,
+ uint8x16_t m)
+{
+ uint8x16_t z = {};
+ uint8x16_t t;
+
+ t = vaesmcq_u8(vaeseq_u8(st.v[3], z));
+ st.v[3] ^= vaesmcq_u8(vaeseq_u8(st.v[2], z));
+ st.v[2] ^= vaesmcq_u8(vaeseq_u8(st.v[1], z));
+ st.v[1] ^= vaesmcq_u8(vaeseq_u8(st.v[0], z));
+ st.v[0] ^= vaesmcq_u8(vaeseq_u8(st.v[4], z)) ^ m;
+ st.v[4] ^= t;
+
+ return st;
+}
+
+void crypto_aegis128_update_neon(void *state, const void *msg)
+{
+ struct aegis128_state st = aegis128_load_state_neon(state);
+
+ st = aegis128_update_neon(st, vld1q_u8(msg));
+
+ aegis128_save_state_neon(st, state);
+}
+
+void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
+ unsigned int size)
+{
+ struct aegis128_state st = aegis128_load_state_neon(state);
+ uint8x16_t tmp;
+
+ while (size >= AEGIS_BLOCK_SIZE) {
+ uint8x16_t s = vld1q_u8(src);
+
+ tmp = s ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
+ st = aegis128_update_neon(st, s);
+ vst1q_u8(dst, tmp);
+
+ size -= AEGIS_BLOCK_SIZE;
+ src += AEGIS_BLOCK_SIZE;
+ dst += AEGIS_BLOCK_SIZE;
+ }
+
+ if (size > 0) {
+ uint8_t buf[AEGIS_BLOCK_SIZE] = {};
+ uint8x16_t msg;
+
+ memcpy(buf, src, size);
+ msg = vld1q_u8(buf);
+ tmp = msg ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
+ st = aegis128_update_neon(st, msg);
+ vst1q_u8(buf, tmp);
+ memcpy(dst, buf, size);
+ }
+
+ aegis128_save_state_neon(st, state);
+}
+
+void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
+ unsigned int size)
+{
+ struct aegis128_state st = aegis128_load_state_neon(state);
+ uint8x16_t tmp;
+
+ while (size >= AEGIS_BLOCK_SIZE) {
+ tmp = vld1q_u8(src) ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
+ st = aegis128_update_neon(st, tmp);
+ vst1q_u8(dst, tmp);
+
+ size -= AEGIS_BLOCK_SIZE;
+ src += AEGIS_BLOCK_SIZE;
+ dst += AEGIS_BLOCK_SIZE;
+ }
+
+ if (size > 0) {
+ uint8_t buf[AEGIS_BLOCK_SIZE] = {};
+ uint8x16_t msg;
+
+ memcpy(buf, src, size);
+ msg = vld1q_u8(buf) ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
+ vst1q_u8(buf, msg);
+ memcpy(dst, buf, size);
+
+ memset(buf + size, 0, AEGIS_BLOCK_SIZE - size);
+ msg = vld1q_u8(buf);
+ st = aegis128_update_neon(st, msg);
+ }
+
+ aegis128_save_state_neon(st, state);
+}
new file mode 100644
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2019 Linaro Ltd <ard.biesheuvel@linaro.org>
+ */
+
+#include <asm/cpufeature.h>
+#include <asm/neon.h>
+
+#include "aegis.h"
+
+void crypto_aegis128_update_neon(void *state, const void *msg);
+void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
+ unsigned int size);
+void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
+ unsigned int size);
+
+bool crypto_aegis128_have_simd(void)
+{
+ return cpu_have_feature(cpu_feature(AES));
+}
+
+void crypto_aegis128_update_simd(union aegis_block *state, const void *msg)
+{
+ kernel_neon_begin();
+ crypto_aegis128_update_neon(state, msg);
+ kernel_neon_end();
+}
+
+void crypto_aegis128_encrypt_chunk_simd(union aegis_block *state, u8 *dst,
+ const u8 *src, unsigned int size)
+{
+ kernel_neon_begin();
+ crypto_aegis128_encrypt_chunk_neon(state, dst, src, size);
+ kernel_neon_end();
+}
+
+void crypto_aegis128_decrypt_chunk_simd(union aegis_block *state, u8 *dst,
+ const u8 *src, unsigned int size)
+{
+ kernel_neon_begin();
+ crypto_aegis128_decrypt_chunk_neon(state, dst, src, size);
+ kernel_neon_end();
+}
Provide an accelerated implementation of aegis128 by wiring up the SIMD hooks in the generic driver to an implementation based on NEON intrinsics, which can be compiled to both ARM and arm64 code. This results in a performance of 2.2 cycles per byte on Cortex-A53, which is a performance increase of ~11x compared to the generic code. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- crypto/Kconfig | 5 + crypto/Makefile | 11 ++ crypto/aegis128-neon-inner.c | 132 ++++++++++++++++++++ crypto/aegis128-neon.c | 43 +++++++ 4 files changed, 191 insertions(+)