[src/trunk]: src/sys/crypto/aes/arch/x86 Implement AES-CCM with VIA ACE.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b3d0a4ffb4a7
branches:  trunk
changeset: 936315:b3d0a4ffb4a7
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sat Jul 25 22:31:32 2020 +0000

description:
Implement AES-CCM with VIA ACE.

diffstat:

 sys/crypto/aes/arch/x86/aes_via.c |  177 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 175 insertions(+), 2 deletions(-)

diffs (203 lines):

diff -r a9f7d0f704fc -r b3d0a4ffb4a7 sys/crypto/aes/arch/x86/aes_via.c
--- a/sys/crypto/aes/arch/x86/aes_via.c Sat Jul 25 22:31:04 2020 +0000
+++ b/sys/crypto/aes/arch/x86/aes_via.c Sat Jul 25 22:31:32 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: aes_via.c,v 1.4 2020/07/25 22:12:57 riastradh Exp $    */
+/*     $NetBSD: aes_via.c,v 1.5 2020/07/25 22:31:32 riastradh Exp $    */
 
 /*-
  * Copyright (c) 2020 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(1, "$NetBSD: aes_via.c,v 1.4 2020/07/25 22:12:57 riastradh Exp $");
+__KERNEL_RCSID(1, "$NetBSD: aes_via.c,v 1.5 2020/07/25 22:31:32 riastradh Exp $");
 
 #ifdef _KERNEL
 #include <sys/types.h>
@@ -674,6 +674,176 @@
        explicit_memset(t, 0, sizeof t);
 }
 
+static struct evcnt cbcmac_aligned_evcnt = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
+    NULL, "aesvia", "cbcmac aligned");
+EVCNT_ATTACH_STATIC(cbcmac_aligned_evcnt);
+static struct evcnt cbcmac_unaligned_evcnt = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
+    NULL, "aesvia", "cbcmac unaligned");
+EVCNT_ATTACH_STATIC(cbcmac_unaligned_evcnt);
+
+static void
+aesvia_cbcmac_update1(const struct aesenc *enc, const uint8_t in[static 16],
+    size_t nbytes, uint8_t auth0[static 16], uint32_t nrounds)
+{
+       const uint32_t cw0 = aesvia_keylen_cw0(nrounds);
+       uint8_t authbuf[16] __aligned(16);
+       uint8_t *auth = auth0;
+
+       KASSERT(nbytes);
+       KASSERT(nbytes % 16 == 0);
+
+       if ((uintptr_t)auth0 & 0xf) {
+               memcpy(authbuf, auth0, 16);
+               auth = authbuf;
+               cbcmac_unaligned_evcnt.ev_count++;
+       } else {
+               cbcmac_aligned_evcnt.ev_count++;
+       }
+
+       fpu_kern_enter();
+       aesvia_reload_keys();
+       for (; nbytes; nbytes -= 16, in += 16) {
+               xor128(auth, auth, in);
+               aesvia_encN(enc, auth, auth, 1, cw0);
+       }
+       fpu_kern_leave();
+
+       if ((uintptr_t)auth0 & 0xf) {
+               memcpy(auth0, authbuf, 16);
+               explicit_memset(authbuf, 0, sizeof authbuf);
+       }
+}
+
+static struct evcnt ccmenc_aligned_evcnt = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
+    NULL, "aesvia", "ccmenc aligned");
+EVCNT_ATTACH_STATIC(ccmenc_aligned_evcnt);
+static struct evcnt ccmenc_unaligned_evcnt = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
+    NULL, "aesvia", "ccmenc unaligned");
+EVCNT_ATTACH_STATIC(ccmenc_unaligned_evcnt);
+
+static void
+aesvia_ccm_enc1(const struct aesenc *enc, const uint8_t in[static 16],
+    uint8_t out[static 16], size_t nbytes, uint8_t authctr0[static 32],
+    uint32_t nrounds)
+{
+       const uint32_t cw0 = aesvia_keylen_cw0(nrounds);
+       uint8_t authctrbuf[32] __aligned(16);
+       uint8_t *authctr;
+       uint32_t c0, c1, c2, c3;
+
+       KASSERT(nbytes);
+       KASSERT(nbytes % 16 == 0);
+
+       if ((uintptr_t)authctr0 & 0xf) {
+               memcpy(authctrbuf, authctr0, 16);
+               authctr = authctrbuf;
+               ccmenc_unaligned_evcnt.ev_count++;
+       } else {
+               ccmenc_aligned_evcnt.ev_count++;
+       }
+       c0 = le32dec(authctr0 + 16 + 4*0);
+       c1 = le32dec(authctr0 + 16 + 4*1);
+       c2 = le32dec(authctr0 + 16 + 4*2);
+       c3 = be32dec(authctr0 + 16 + 4*3);
+
+       /*
+        * In principle we could use REP XCRYPTCTR here, but that
+        * doesn't help to compute the CBC-MAC step, and certain VIA
+        * CPUs have some weird errata with REP XCRYPTCTR that make it
+        * kind of a pain to use.  So let's just use REP XCRYPTECB to
+        * simultaneously compute the CBC-MAC step and the CTR step.
+        * (Maybe some VIA CPUs will compute REP XCRYPTECB in parallel,
+        * who knows...)
+        */
+       fpu_kern_enter();
+       aesvia_reload_keys();
+       for (; nbytes; nbytes -= 16, in += 16, out += 16) {
+               xor128(authctr, authctr, in);
+               le32enc(authctr + 16 + 4*0, c0);
+               le32enc(authctr + 16 + 4*1, c1);
+               le32enc(authctr + 16 + 4*2, c2);
+               be32enc(authctr + 16 + 4*3, ++c3);
+               aesvia_encN(enc, authctr, authctr, 2, cw0);
+               xor128(out, in, authctr + 16);
+       }
+       fpu_kern_leave();
+
+       if ((uintptr_t)authctr0 & 0xf) {
+               memcpy(authctr0, authctrbuf, 16);
+               explicit_memset(authctrbuf, 0, sizeof authctrbuf);
+       }
+
+       le32enc(authctr0 + 16 + 4*0, c0);
+       le32enc(authctr0 + 16 + 4*1, c1);
+       le32enc(authctr0 + 16 + 4*2, c2);
+       be32enc(authctr0 + 16 + 4*3, c3);
+}
+
+static struct evcnt ccmdec_aligned_evcnt = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
+    NULL, "aesvia", "ccmdec aligned");
+EVCNT_ATTACH_STATIC(ccmdec_aligned_evcnt);
+static struct evcnt ccmdec_unaligned_evcnt = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
+    NULL, "aesvia", "ccmdec unaligned");
+EVCNT_ATTACH_STATIC(ccmdec_unaligned_evcnt);
+
+static void
+aesvia_ccm_dec1(const struct aesenc *enc, const uint8_t in[static 16],
+    uint8_t out[static 16], size_t nbytes, uint8_t authctr0[static 32],
+    uint32_t nrounds)
+{
+       const uint32_t cw0 = aesvia_keylen_cw0(nrounds);
+       uint8_t authctrbuf[32] __aligned(16);
+       uint8_t *authctr;
+       uint32_t c0, c1, c2, c3;
+
+       KASSERT(nbytes);
+       KASSERT(nbytes % 16 == 0);
+
+       c0 = le32dec(authctr0 + 16 + 4*0);
+       c1 = le32dec(authctr0 + 16 + 4*1);
+       c2 = le32dec(authctr0 + 16 + 4*2);
+       c3 = be32dec(authctr0 + 16 + 4*3);
+
+       if ((uintptr_t)authctr0 & 0xf) {
+               memcpy(authctrbuf, authctr0, 16);
+               authctr = authctrbuf;
+               le32enc(authctr + 16 + 4*0, c0);
+               le32enc(authctr + 16 + 4*1, c1);
+               le32enc(authctr + 16 + 4*2, c2);
+               ccmdec_unaligned_evcnt.ev_count++;
+       } else {
+               ccmdec_aligned_evcnt.ev_count++;
+       }
+
+       fpu_kern_enter();
+       aesvia_reload_keys();
+       be32enc(authctr + 16 + 4*3, ++c3);
+       aesvia_encN(enc, authctr + 16, authctr + 16, 1, cw0);
+       for (;; in += 16, out += 16) {
+               xor128(out, authctr + 16, in);
+               xor128(authctr, authctr, out);
+               if ((nbytes -= 16) == 0)
+                       break;
+               le32enc(authctr + 16 + 4*0, c0);
+               le32enc(authctr + 16 + 4*1, c1);
+               le32enc(authctr + 16 + 4*2, c2);
+               be32enc(authctr + 16 + 4*3, ++c3);
+               aesvia_encN(enc, authctr, authctr, 2, cw0);
+       }
+       aesvia_encN(enc, authctr, authctr, 1, cw0);
+       fpu_kern_leave();
+
+       if ((uintptr_t)authctr0 & 0xf) {
+               memcpy(authctr0, authctrbuf, 16);
+               explicit_memset(authctrbuf, 0, sizeof authctrbuf);
+       }
+
+       le32enc(authctr0 + 16 + 4*0, c0);
+       le32enc(authctr0 + 16 + 4*1, c1);
+       le32enc(authctr0 + 16 + 4*2, c2);
+       be32enc(authctr0 + 16 + 4*3, c3);
+}
+
 static int
 aesvia_probe(void)
 {
@@ -727,4 +897,7 @@
        .ai_cbc_dec = aesvia_cbc_dec,
        .ai_xts_enc = aesvia_xts_enc,
        .ai_xts_dec = aesvia_xts_dec,
+       .ai_cbcmac_update1 = aesvia_cbcmac_update1,
+       .ai_ccm_enc1 = aesvia_ccm_enc1,
+       .ai_ccm_dec1 = aesvia_ccm_dec1,
 };