* cipher/Makefile.am: Add 'cipher-gcm-aarch64-simd.c'.
* cipher/cipher-gcm-aarch64-simd.c: New.
* cipher/cipher-gcm.c [GCM_USE_AARCH64]: Add function
prototypes for AArch64/SIMD implementation.
(setupM) [GCM_USE_AARCH64]: Add setup for AArch64/SIMD
implementation.
* cipher/cipher-internal.h (GCM_USE_AARCH64): New.
* configure.ac: Add 'cipher-gcm-aarch64-simd.c'.
--
Patch adds GHASH/GCM intrinsics implementation for
AArch64. This is for CPUs without crypto extensions
instruction set support.
Benchmark on Cortex-A53 (1152 Mhz):
Before:
| nanosecs/byte mebibytes/sec cycles/byte
GMAC_AES | 12.22 ns/B 78.07 MiB/s 14.07 c/B
After:
| nanosecs/byte mebibytes/sec cycles/byte
GMAC_AES | 7.38 ns/B 129.2 MiB/s 8.50 c/B
Signed-off-by: Jussi Kivilinna <jussi.kivili...@iki.fi>
---
cipher/Makefile.am | 9 +-
cipher/cipher-gcm-aarch64-simd.c | 320 +++++++++++++++++++++++++++++++
cipher/cipher-gcm.c | 14 ++
cipher/cipher-internal.h | 6 +
configure.ac | 1 +
5 files changed, 349 insertions(+), 1 deletion(-)
create mode 100644 cipher/cipher-gcm-aarch64-simd.c
diff --git a/cipher/Makefile.am b/cipher/Makefile.am
index 2528bc39..633c53ed 100644
--- a/cipher/Makefile.am
+++ b/cipher/Makefile.am
@@ -89,7 +89,8 @@ EXTRA_libcipher_la_SOURCES = \
chacha20-amd64-avx512.S chacha20-armv7-neon.S chacha20-aarch64.S \
chacha20-ppc.c chacha20-s390x.S \
chacha20-p10le-8x.s \
- cipher-gcm-ppc.c cipher-gcm-intel-pclmul.c cipher-gcm-armv7-neon.S \
+ cipher-gcm-ppc.c cipher-gcm-intel-pclmul.c \
+ cipher-gcm-aarch64-simd.c cipher-gcm-armv7-neon.S \
cipher-gcm-armv8-aarch32-ce.S cipher-gcm-armv8-aarch64-ce.S \
crc.c crc-intel-pclmul.c crc-armv8-ce.c \
crc-armv8-aarch64-ce.S \
@@ -325,6 +326,12 @@ camellia-aarch64-ce.o: $(srcdir)/camellia-aarch64-ce.c
Makefile
camellia-aarch64-ce.lo: $(srcdir)/camellia-aarch64-ce.c Makefile
`echo $(LTCOMPILE) $(aarch64_crypto_cflags) -c $< |
$(instrumentation_munging) `
+cipher-gcm-aarch64-simd.o: $(srcdir)/cipher-gcm-aarch64-simd.c Makefile
+ `echo $(COMPILE) $(aarch64_simd_cflags) -c $< |
$(instrumentation_munging) `
+
+cipher-gcm-aarch64-simd.lo: $(srcdir)/cipher-gcm-aarch64-simd.c Makefile
+ `echo $(LTCOMPILE) $(aarch64_simd_cflags) -c $< |
$(instrumentation_munging) `
+
rijndael-vp-aarch64.o: $(srcdir)/rijndael-vp-aarch64.c Makefile
`echo $(COMPILE) $(aarch64_simd_cflags) -c $< |
$(instrumentation_munging) `
diff --git a/cipher/cipher-gcm-aarch64-simd.c b/cipher/cipher-gcm-aarch64-simd.c
new file mode 100644
index 00000000..ecb55a9f
--- /dev/null
+++ b/cipher/cipher-gcm-aarch64-simd.c
@@ -0,0 +1,320 @@
+/* cipher-gcm-aarch64-simd.c - ARM/NEON accelerated GHASH
+ * Copyright (C) 2019-2024 Jussi Kivilinna <jussi.kivili...@iki.fi>
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+
+#include "types.h"
+#include "g10lib.h"
+#include "cipher.h"
+#include "bufhelp.h"
+#include "./cipher-internal.h"
+
+#ifdef GCM_USE_AARCH64
+
+#include "simd-common-aarch64.h"
+#include <arm_neon.h>
+
+#define ALWAYS_INLINE inline __attribute__((always_inline))
+#define NO_INLINE __attribute__((noinline))
+#define NO_INSTRUMENT_FUNCTION __attribute__((no_instrument_function))
+
+#define ASM_FUNC_ATTR NO_INSTRUMENT_FUNCTION
+#define ASM_FUNC_ATTR_INLINE ASM_FUNC_ATTR ALWAYS_INLINE
+#define ASM_FUNC_ATTR_NOINLINE ASM_FUNC_ATTR NO_INLINE
+
+static ASM_FUNC_ATTR_INLINE uint64x2_t
+byteswap_u64x2(uint64x2_t vec)
+{
+ vec = (uint64x2_t)vrev64q_u8((uint8x16_t)vec);
+ vec = (uint64x2_t)vextq_u8((uint8x16_t)vec, (uint8x16_t)vec, 8);
+ return vec;
+}
+
+static ASM_FUNC_ATTR_INLINE uint64x2_t
+veor_u64x2(uint64x2_t va, uint64x2_t vb)
+{
+ return (uint64x2_t)veorq_u8((uint8x16_t)va, (uint8x16_t)vb);
+}
+
+static ASM_FUNC_ATTR_INLINE uint64x1_t
+veor_u64x1(uint64x1_t va, uint64x1_t vb)
+{
+ return (uint64x1_t)veor_u8((uint8x8_t)va, (uint8x8_t)vb);
+}
+
+static ASM_FUNC_ATTR_INLINE uint64x1_t
+vand_u64x1(uint64x1_t va, uint64x1_t vb)
+{
+ return (uint64x1_t)vand_u8((uint8x8_t)va, (uint8x8_t)vb);
+}
+
+static ASM_FUNC_ATTR_INLINE uint64x1_t
+vorr_u64x1(uint64x1_t va, uint64x1_t vb)
+{
+ return (uint64x1_t)vorr_u8((uint8x8_t)va, (uint8x8_t)vb);
+}
+
+/* 64x64=>128 carry-less multiplication using vmull.p8 instruction.
+ *
+ * From "Câmara, D.; Gouvêa, C. P. L.; López, J. & Dahab, R. Fast Software
+ * Polynomial Multiplication on ARM Processors using the NEON Engine. The
+ * Second International Workshop on Modern Cryptography and Security
+ * Engineering — MoCrySEn, 2013". */
+static ASM_FUNC_ATTR_INLINE uint64x2_t
+emulate_vmull_p64(uint64x1_t ad, uint64x1_t bd)
+{
+ static const uint64x1_t k0 = { 0 };
+ static const uint64x1_t k16 = { U64_C(0xffff) };
+ static const uint64x1_t k32 = { U64_C(0xffffffff) };
+ static const uint64x1_t k48 = { U64_C(0xffffffffffff) };
+ uint64x1_t rl;
+ uint64x2_t rq;
+ uint64x1_t t0l;
+ uint64x1_t t0h;
+ uint64x2_t t0q;
+ uint64x1_t t1l;
+ uint64x1_t t1h;
+ uint64x2_t t1q;
+ uint64x1_t t2l;
+ uint64x1_t t2h;
+ uint64x2_t t2q;
+ uint64x1_t t3l;
+ uint64x1_t t3h;
+ uint64x2_t t3q;
+
+ t0l = (uint64x1_t)vext_u8((uint8x8_t)ad, (uint8x8_t)ad, 1);
+ t0q = (uint64x2_t)vmull_p8((poly8x8_t)t0l, (poly8x8_t)bd);
+
+ rl = (uint64x1_t)vext_u8((uint8x8_t)bd, (uint8x8_t)bd, 1);
+ rq = (uint64x2_t)vmull_p8((poly8x8_t)ad, (poly8x8_t)rl);
+
+ t1l = (uint64x1_t)vext_u8((uint8x8_t)ad, (uint8x8_t)ad, 2);
+ t1q = (uint64x2_t)vmull_p8((poly8x8_t)t1l, (poly8x8_t)bd);
+
+ t3l = (uint64x1_t)vext_u8((uint8x8_t)bd, (uint8x8_t)bd, 2);
+ t3q = (uint64x2_t)vmull_p8((poly8x8_t)ad, (poly8x8_t)t3l);
+
+ t2l = (uint64x1_t)vext_u8((uint8x8_t)ad, (uint8x8_t)ad, 3);
+ t2q = (uint64x2_t)vmull_p8((poly8x8_t)t2l, (poly8x8_t)bd);
+
+ t0q = veor_u64x2(t0q, rq);
+ t0l = vget_low_u64(t0q);
+ t0h = vget_high_u64(t0q);
+
+ rl = (uint64x1_t)vext_u8((uint8x8_t)bd, (uint8x8_t)bd, 3);
+ rq = (uint64x2_t)vmull_p8((poly8x8_t)ad, (poly8x8_t)rl);
+
+ t1q = veor_u64x2(t1q, t3q);
+ t1l = vget_low_u64(t1q);
+ t1h = vget_high_u64(t1q);
+
+ t3l = (uint64x1_t)vext_u8((uint8x8_t)bd, (uint8x8_t)bd, 4);
+ t3q = (uint64x2_t)vmull_p8((poly8x8_t)ad, (poly8x8_t)t3l);
+ t3l = vget_low_u64(t3q);
+ t3h = vget_high_u64(t3q);
+
+ t0l = veor_u64x1(t0l, t0h);
+ t0h = vand_u64x1(t0h, k48);
+ t1l = veor_u64x1(t1l, t1h);
+ t1h = vand_u64x1(t1h, k32);
+ t2q = veor_u64x2(t2q, rq);
+ t2l = vget_low_u64(t2q);
+ t2h = vget_high_u64(t2q);
+ t0l = veor_u64x1(t0l, t0h);
+ t1l = veor_u64x1(t1l, t1h);
+ t2l = veor_u64x1(t2l, t2h);
+ t2h = vand_u64x1(t2h, k16);
+ t3l = veor_u64x1(t3l, t3h);
+ t3h = k0;
+ t0q = vcombine_u64(t0l, t0h);
+ t0q = (uint64x2_t)vextq_u8((uint8x16_t)t0q, (uint8x16_t)t0q, 15);
+ t2l = veor_u64x1(t2l, t2h);
+ t1q = vcombine_u64(t1l, t1h);
+ t1q = (uint64x2_t)vextq_u8((uint8x16_t)t1q, (uint8x16_t)t1q, 14);
+ rq = (uint64x2_t)vmull_p8((poly8x8_t)ad, (poly8x8_t)bd);
+ t2q = vcombine_u64(t2l, t2h);
+ t2q = (uint64x2_t)vextq_u8((uint8x16_t)t2q, (uint8x16_t)t2q, 13);
+ t3q = vcombine_u64(t3l, t3h);
+ t3q = (uint64x2_t)vextq_u8((uint8x16_t)t3q, (uint8x16_t)t3q, 12);
+ t0q = veor_u64x2(t0q, t1q);
+ t2q = veor_u64x2(t2q, t3q);
+ rq = veor_u64x2(rq, t0q);
+ rq = veor_u64x2(rq, t2q);
+ return rq;
+}
+
+/* GHASH functions.
+ *
+ * See "Gouvêa, C. P. L. & López, J. Implementing GCM on ARMv8. Topics in
+ * Cryptology — CT-RSA 2015" for details.
+ */
+static ASM_FUNC_ATTR_INLINE uint64x2x2_t
+pmul_128x128(uint64x2_t a, uint64x2_t b)
+{
+ uint64x1_t a_l = vget_low_u64(a);
+ uint64x1_t a_h = vget_high_u64(a);
+ uint64x1_t b_l = vget_low_u64(b);
+ uint64x1_t b_h = vget_high_u64(b);
+ uint64x1_t t1_h = veor_u64x1(b_l, b_h);
+ uint64x1_t t1_l = veor_u64x1(a_l, a_h);
+ uint64x2_t r0 = emulate_vmull_p64(a_l, b_l);
+ uint64x2_t r1 = emulate_vmull_p64(a_h, b_h);
+ uint64x2_t t2 = emulate_vmull_p64(t1_h, t1_l);
+ uint64x1_t t2_l, t2_h;
+ uint64x1_t r0_l, r0_h;
+ uint64x1_t r1_l, r1_h;
+
+ t2 = veor_u64x2(t2, r0);
+ t2 = veor_u64x2(t2, r1);
+
+ r0_l = vget_low_u64(r0);
+ r0_h = vget_high_u64(r0);
+ r1_l = vget_low_u64(r1);
+ r1_h = vget_high_u64(r1);
+ t2_l = vget_low_u64(t2);
+ t2_h = vget_high_u64(t2);
+
+ r0_h = veor_u64x1(r0_h, t2_l);
+ r1_l = veor_u64x1(r1_l, t2_h);
+
+ r0 = vcombine_u64(r0_l, r0_h);
+ r1 = vcombine_u64(r1_l, r1_h);
+
+ return (const uint64x2x2_t){ .val = { r0, r1 } };
+}
+
+/* Reduction using Xor and Shift.
+ *
+ * See "Shay Gueron, Michael E. Kounavis. Intel Carry-Less Multiplication
+ * Instruction and its Usage for Computing the GCM Mode" for details.
+ */
+static ASM_FUNC_ATTR_INLINE uint64x2_t
+reduction(uint64x2x2_t r0r1)
+{
+ static const uint64x2_t k0 = { U64_C(0), U64_C(0) };
+ uint64x2_t r0 = r0r1.val[0];
+ uint64x2_t r1 = r0r1.val[1];
+ uint64x2_t t0q;
+ uint64x2_t t1q;
+ uint64x2_t t2q;
+ uint64x2_t t;
+
+ t0q = (uint64x2_t)vshlq_n_u32((uint32x4_t)r0, 31);
+ t1q = (uint64x2_t)vshlq_n_u32((uint32x4_t)r0, 30);
+ t2q = (uint64x2_t)vshlq_n_u32((uint32x4_t)r0, 25);
+ t0q = veor_u64x2(t0q, t1q);
+ t0q = veor_u64x2(t0q, t2q);
+ t = (uint64x2_t)vextq_u8((uint8x16_t)t0q, (uint8x16_t)k0, 4);
+ t0q = (uint64x2_t)vextq_u8((uint8x16_t)k0, (uint8x16_t)t0q, 16 - 12);
+ r0 = veor_u64x2(r0, t0q);
+ t0q = (uint64x2_t)vshrq_n_u32((uint32x4_t)r0, 1);
+ t1q = (uint64x2_t)vshrq_n_u32((uint32x4_t)r0, 2);
+ t2q = (uint64x2_t)vshrq_n_u32((uint32x4_t)r0, 7);
+ t0q = veor_u64x2(t0q, t1q);
+ t0q = veor_u64x2(t0q, t2q);
+ t0q = veor_u64x2(t0q, t);
+ r0 = veor_u64x2(r0, t0q);
+ return veor_u64x2(r0, r1);
+}
+
+ASM_FUNC_ATTR_NOINLINE unsigned int
+_gcry_ghash_aarch64_simd(gcry_cipher_hd_t c, byte *result, const byte *buf,
+ size_t nblocks)
+{
+ uint64x2_t rhash;
+ uint64x2_t rh1;
+ uint64x2_t rbuf;
+ uint64x2x2_t rr0rr1;
+
+ if (nblocks == 0)
+ return 0;
+
+ rhash = vld1q_u64((const void *)result);
+ rh1 = vld1q_u64((const void *)c->u_mode.gcm.u_ghash_key.key);
+
+ rhash = byteswap_u64x2(rhash);
+
+ rbuf = vld1q_u64((const void *)buf);
+ buf += 16;
+ nblocks--;
+
+ rbuf = byteswap_u64x2(rbuf);
+
+ rhash = veor_u64x2(rhash, rbuf);
+
+ while (nblocks)
+ {
+ rbuf = vld1q_u64((const void *)buf);
+ buf += 16;
+ nblocks--;
+
+ rr0rr1 = pmul_128x128(rhash, rh1);
+
+ rbuf = byteswap_u64x2(rbuf);
+
+ rhash = reduction(rr0rr1);
+
+ rhash = veor_u64x2(rhash, rbuf);
+ }
+
+ rr0rr1 = pmul_128x128(rhash, rh1);
+ rhash = reduction(rr0rr1);
+
+ rhash = byteswap_u64x2(rhash);
+
+ vst1q_u64((void *)result, rhash);
+
+ clear_vec_regs();
+
+ return 0;
+}
+
+static ASM_FUNC_ATTR_INLINE void
+gcm_lsh_1(void *r_out, uint64x2_t i)
+{
+ static const uint64x1_t const_d = { U64_C(0xc200000000000000) };
+ uint64x1_t ia = vget_low_u64(i);
+ uint64x1_t ib = vget_high_u64(i);
+ uint64x1_t oa, ob, ma;
+
+ ma = (uint64x1_t)vshr_n_s64((int64x1_t)ib, 63);
+ oa = vshr_n_u64(ib, 63);
+ ob = vshr_n_u64(ia, 63);
+ ma = vand_u64x1(ma, const_d);
+ ib = vshl_n_u64(ib, 1);
+ ia = vshl_n_u64(ia, 1);
+ ob = vorr_u64x1(ob, ib);
+ oa = vorr_u64x1(oa, ia);
+ ob = veor_u64x1(ob, ma);
+ vst2_u64(r_out, (const uint64x1x2_t){ .val = { oa, ob } });
+}
+
+ASM_FUNC_ATTR_NOINLINE void
+_gcry_ghash_setup_aarch64_simd(gcry_cipher_hd_t c)
+{
+ uint64x2_t rhash = vld1q_u64((const void *)c->u_mode.gcm.u_ghash_key.key);
+
+ rhash = byteswap_u64x2(rhash);
+
+ gcm_lsh_1(c->u_mode.gcm.u_ghash_key.key, rhash);
+
+ clear_vec_regs();
+}
+
+#endif /* GCM_USE_AARCH64 */
diff --git a/cipher/cipher-gcm.c b/cipher/cipher-gcm.c
index d3c04d58..9fbdb02e 100644
--- a/cipher/cipher-gcm.c
+++ b/cipher/cipher-gcm.c
@@ -102,6 +102,13 @@ ghash_armv7_neon (gcry_cipher_hd_t c, byte *result, const
byte *buf,
}
#endif /* GCM_USE_ARM_NEON */
+#ifdef GCM_USE_AARCH64
+extern void _gcry_ghash_setup_aarch64_simd(gcry_cipher_hd_t c);
+
+extern unsigned int _gcry_ghash_aarch64_simd(gcry_cipher_hd_t c, byte *result,
+ const byte *buf, size_t nblocks);
+#endif /* GCM_USE_AARCH64 */
+
#ifdef GCM_USE_S390X_CRYPTO
#include "asm-inline-s390x.h"
@@ -607,6 +614,13 @@ setupM (gcry_cipher_hd_t c)
ghash_setup_armv7_neon (c);
}
#endif
+#ifdef GCM_USE_AARCH64
+ else if (features & HWF_ARM_NEON)
+ {
+ c->u_mode.gcm.ghash_fn = _gcry_ghash_aarch64_simd;
+ _gcry_ghash_setup_aarch64_simd (c);
+ }
+#endif
#ifdef GCM_USE_PPC_VPMSUM
else if (features & HWF_PPC_VCRYPTO)
{
diff --git a/cipher/cipher-internal.h b/cipher/cipher-internal.h
index cd8ff788..ddf8fbb5 100644
--- a/cipher/cipher-internal.h
+++ b/cipher/cipher-internal.h
@@ -112,6 +112,12 @@
#endif
#endif /* GCM_USE_ARM_NEON */
+/* GCM_USE_AARCH64 indicates whether to compile GCM with AArch64 SIMD code. */
+#undef GCM_USE_AARCH64
+#if defined(__AARCH64EL__) && defined(HAVE_COMPATIBLE_GCC_AARCH64_PLATFORM_AS)
+# define GCM_USE_AARCH64 1
+#endif
+
/* GCM_USE_S390X_CRYPTO indicates whether to enable zSeries code. */
#undef GCM_USE_S390X_CRYPTO
#if defined(HAVE_GCC_INLINE_ASM_S390X)
diff --git a/configure.ac b/configure.ac
index 6347ea25..a7f922b1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3644,6 +3644,7 @@ case "${host}" in
GCRYPT_ASM_DIGESTS="$GCRYPT_ASM_DIGESTS cipher-gcm-armv8-aarch32-ce.lo"
;;
aarch64-*-*)
+ GCRYPT_ASM_DIGESTS="$GCRYPT_ASM_DIGESTS cipher-gcm-aarch64-simd.lo"
GCRYPT_ASM_DIGESTS="$GCRYPT_ASM_DIGESTS cipher-gcm-armv8-aarch64-ce.lo"
;;
powerpc64le-*-* | powerpc64-*-* | powerpc-*-*)
--
2.45.2
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