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[src-draft/trunk]: src/sys First pass at AES using ARMv8.0-AES on aarch64.



details:   https://anonhg.NetBSD.org/src-all/rev/808d7dd7d7d8
branches:  trunk
changeset: 934471:808d7dd7d7d8
user:      Taylor R Campbell <riastradh%NetBSD.org@localhost>
date:      Sat Jun 13 16:43:32 2020 +0000

description:
First pass at AES using ARMv8.0-AES on aarch64.

No vectorized CBC or XTS yet.

diffstat:

 sys/arch/aarch64/aarch64/cpu.c           |   24 +
 sys/arch/aarch64/conf/files.aarch64      |    3 +
 sys/crypto/aes/arch/aarch64/aes_arm.c    |  247 ++++++++++++++
 sys/crypto/aes/arch/aarch64/aes_arm.h    |   51 ++
 sys/crypto/aes/arch/aarch64/aesarmfunc.S |  541 +++++++++++++++++++++++++++++++
 sys/crypto/aes/arch/aarch64/files.aesarm |    4 +
 6 files changed, 870 insertions(+), 0 deletions(-)

diffs (truncated from 924 to 300 lines):

diff -r 9fbde457af48 -r 808d7dd7d7d8 sys/arch/aarch64/aarch64/cpu.c
--- a/sys/arch/aarch64/aarch64/cpu.c    Thu Jun 04 03:23:00 2020 +0000
+++ b/sys/arch/aarch64/aarch64/cpu.c    Sat Jun 13 16:43:32 2020 +0000
@@ -44,6 +44,8 @@
 #include <sys/sysctl.h>
 #include <sys/systm.h>
 
+#include <crypto/aes/arch/aarch64/aes_arm.h>
+
 #include <aarch64/armreg.h>
 #include <aarch64/cpu.h>
 #include <aarch64/cpufunc.h>
@@ -70,6 +72,7 @@
 static void cpu_setup_id(struct cpu_info *);
 static void cpu_setup_sysctl(device_t, struct cpu_info *);
 static void cpu_setup_rng(device_t, struct cpu_info *);
+static void cpu_setup_aes(device_t, struct cpu_info *);
 
 #ifdef MULTIPROCESSOR
 #define NCPUINFO       MAXCPUS
@@ -158,6 +161,7 @@
 
        cpu_setup_sysctl(dv, ci);
        cpu_setup_rng(dv, ci);
+       cpu_setup_aes(dv, ci);
 }
 
 struct cpuidtab {
@@ -573,6 +577,26 @@
            RND_FLAG_DEFAULT|RND_FLAG_HASCB);
 }
 
+/*
+ * setup the AES implementation
+ */
+static void
+cpu_setup_aes(device_t dv, struct cpu_info *ci)
+{
+       struct aarch64_sysctl_cpu_id *id = &ci->ci_id;
+
+       /* Verify that it is supported.  */
+       switch (__SHIFTOUT(id->ac_aa64isar0, ID_AA64ISAR0_EL1_AES)) {
+       case ID_AA64ISAR0_EL1_AES_AES:
+       case ID_AA64ISAR0_EL1_AES_PMUL:
+               break;
+       default:
+               return;
+       }
+
+       aes_md_init(&aes_arm_impl);
+}
+
 #ifdef MULTIPROCESSOR
 void
 cpu_hatch(struct cpu_info *ci)
diff -r 9fbde457af48 -r 808d7dd7d7d8 sys/arch/aarch64/conf/files.aarch64
--- a/sys/arch/aarch64/conf/files.aarch64       Thu Jun 04 03:23:00 2020 +0000
+++ b/sys/arch/aarch64/conf/files.aarch64       Sat Jun 13 16:43:32 2020 +0000
@@ -138,3 +138,6 @@
 
 # profiling support
 file   dev/tprof/tprof_armv8.c                 tprof   needs-flag
+
+# AES
+include "crypto/aes/arch/aarch64/files.aesarm"
diff -r 9fbde457af48 -r 808d7dd7d7d8 sys/crypto/aes/arch/aarch64/aes_arm.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/crypto/aes/arch/aarch64/aes_arm.c     Sat Jun 13 16:43:32 2020 +0000
@@ -0,0 +1,247 @@
+/*     $NetBSD$        */
+
+/*-
+ * Copyright (c) 2020 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(1, "$NetBSD$");
+
+#include <sys/types.h>
+#include <sys/proc.h>
+#include <sys/systm.h>
+
+#include <crypto/aes/aes.h>
+#include <crypto/aes/arch/aarch64/aes_arm.h>
+
+#include <aarch64/machdep.h>
+
+static void
+aesarm_setenckey(struct aesenc *enc, const uint8_t key[static 16],
+    uint32_t nrounds)
+{
+
+       switch (nrounds) {
+       case 10:
+               aesarm_setenckey128(enc, key);
+               break;
+       case 12:
+               aesarm_setenckey192(enc, key);
+               break;
+       case 14:
+               aesarm_setenckey256(enc, key);
+               break;
+       default:
+               panic("invalid AES rounds: %u", nrounds);
+       }
+}
+
+static void
+aesarm_setdeckey(struct aesdec *dec, const uint8_t key[static 16],
+    uint32_t nrounds)
+{
+       struct aesenc enc;
+
+       aesarm_setenckey(&enc, key, nrounds);
+       aesarm_enctodec(&enc, dec, nrounds);
+       explicit_memset(&enc, 0, sizeof enc);
+}
+
+static void
+xor(uint8_t x[static 16],
+    const uint8_t a[static 16], const uint8_t b[static 16])
+{
+       uint64_t alo, ahi;
+       uint64_t blo, bhi;
+       uint64_t xlo, xhi;
+
+       memcpy(&alo, a, 8);
+       memcpy(&ahi, a + 8, 8);
+       memcpy(&blo, b, 8);
+       memcpy(&bhi, b + 8, 8);
+       xlo = alo ^ blo;
+       xhi = ahi ^ bhi;
+       memcpy(x, &xlo, 8);
+       memcpy(x + 8, &xhi, 8);
+}
+
+static void
+aesarm_cbc_enc(const struct aesenc *enc, const uint8_t in[static 16],
+    uint8_t out[static 16], size_t nbytes, uint8_t iv[static 16],
+    uint32_t nrounds)
+{
+
+       KASSERT(nbytes % 16 == 0);
+
+       for (; nbytes; nbytes -= 16, in += 16, out += 16) {
+               xor(iv, in, iv);
+               aesarm_enc(enc, iv, out, nrounds);
+               memcpy(iv, out, 16);
+       }
+}
+
+static void
+aesarm_cbc_dec(const struct aesdec *dec, const uint8_t in[static 16],
+    uint8_t out[static 16], size_t nbytes, uint8_t iv[static 16],
+    uint32_t nrounds)
+{
+       uint8_t tmp[16];
+
+       KASSERT(nbytes % 16 == 0);
+
+       for (; nbytes; nbytes -= 16, in += 16, out += 16) {
+               memcpy(tmp, in, 16);
+               aesarm_dec(dec, in, out, nrounds);
+               xor(out, out, iv);
+               memcpy(iv, tmp, 16);
+       }
+}
+
+static inline void
+aesarm_xts_update(const uint8_t in[static 16], uint8_t out[static 16])
+{
+       uint64_t t0, t1;
+       unsigned s0, s1;
+
+       t0 = le64dec(in + 8*0);
+       t1 = le64dec(in + 8*1);
+
+       s0 = t0 >> 63;
+       s1 = t1 >> 63;
+       t0 = (t0 << 1) ^ (-s1 & 0x87);
+       t1 = (t1 << 1) ^ s0;
+
+       le64enc(out + 8*0, t0);
+       le64enc(out + 8*1, t1);
+}
+
+static int
+aesarm_xts_update_selftest(void)
+{
+       static const struct {
+               uint8_t in[16], out[16];
+       } cases[] = {
+               {{1}, {2}},
+               {{0,0,0,0x80}, {0,0,0,0,1}},
+               {{0,0,0,0,0,0,0,0x80}, {0,0,0,0,0,0,0,0,1}},
+               {{0,0,0,0x80,0,0,0,0x80}, {0,0,0,0,1,0,0,0,1}},
+               {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0x80}, {0x87}},
+               {{0,0,0,0,0,0,0,0x80,0,0,0,0,0,0,0,0x80},
+                {0x87,0,0,0,0,0,0,0,1}},
+               {{0,0,0,0x80,0,0,0,0,0,0,0,0,0,0,0,0x80}, {0x87,0,0,0,1}},
+               {{0,0,0,0x80,0,0,0,0x80,0,0,0,0,0,0,0,0x80},
+                {0x87,0,0,0,1,0,0,0,1}},
+       };
+       unsigned i;
+       uint8_t tweak[16];
+
+       for (i = 0; i < sizeof(cases)/sizeof(cases[0]); i++) {
+               aesarm_xts_update(cases[i].in, tweak);
+               if (memcmp(tweak, cases[i].out, 16))
+                       return -1;
+       }
+
+       /* Success!  */
+       return 0;
+}
+
+static void
+aesarm_xts_enc(const struct aesenc *enc, const uint8_t in[static 16],
+    uint8_t out[static 16], size_t nbytes, uint8_t tweak[static 16],
+    uint32_t nrounds)
+{
+       uint8_t tmp[16];
+
+       KASSERT(nbytes % 16 == 0);
+
+       for (; nbytes; nbytes -= 16, in += 16, out += 16) {
+               xor(tmp, in, tweak);
+               aesarm_enc(enc, tmp, tmp, nrounds);
+               xor(out, tmp, tweak);
+               aesarm_xts_update(tweak, tweak);
+       }
+
+       explicit_memset(tmp, 0, sizeof tmp);
+}
+
+static void
+aesarm_xts_dec(const struct aesdec *dec, const uint8_t in[static 16],
+    uint8_t out[static 16], size_t nbytes, uint8_t tweak[static 16],
+    uint32_t nrounds)
+{
+       uint8_t tmp[16];
+
+       KASSERT(nbytes % 16 == 0);
+
+       for (; nbytes; nbytes -= 16, in += 16, out += 16) {
+               xor(tmp, in, tweak);
+               aesarm_dec(dec, tmp, tmp, nrounds);
+               xor(out, tmp, tweak);
+               aesarm_xts_update(tweak, tweak);
+       }
+
+       explicit_memset(tmp, 0, sizeof tmp);
+}
+
+static int
+aesarm_probe(void)
+{
+       struct aarch64_sysctl_cpu_id *id = &curcpu()->ci_id;
+       int result = 0;
+
+       /* Verify that the CPU supports AES.  */
+       switch (__SHIFTOUT(id->ac_aa64isar0, ID_AA64ISAR0_EL1_AES)) {
+       case ID_AA64ISAR0_EL1_AES_AES:
+       case ID_AA64ISAR0_EL1_AES_PMUL:
+               break;
+       default:
+               return -1;
+       }
+
+       fpu_kern_enter();
+
+       /* Verify that our XTS tweak update logic works.  */
+       if (aesarm_xts_update_selftest())
+               result = -1;
+
+       fpu_kern_leave();
+
+       return result;



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