--- /dev/null
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+// This implementation was taken from the public domain, neon2 version in
+// SUPERCOP by D. J. Bernstein and Peter Schwabe.
+
+#include <openssl/poly1305.h>
+
+#include <string.h>
+
+#include "../internal.h"
+#include "internal.h"
+
+
+#if defined(OPENSSL_POLY1305_NEON)
+
+typedef struct {
+ uint32_t v[12]; // for alignment; only using 10
+} fe1305x2;
+
+#define addmulmod openssl_poly1305_neon2_addmulmod
+#define blocks openssl_poly1305_neon2_blocks
+
+extern void addmulmod(fe1305x2 *r, const fe1305x2 *x, const fe1305x2 *y,
+ const fe1305x2 *c);
+
+extern int blocks(fe1305x2 *h, const fe1305x2 *precomp, const uint8_t *in,
+ unsigned int inlen);
+
+static void freeze(fe1305x2 *r) {
+ int i;
+
+ uint32_t x0 = r->v[0];
+ uint32_t x1 = r->v[2];
+ uint32_t x2 = r->v[4];
+ uint32_t x3 = r->v[6];
+ uint32_t x4 = r->v[8];
+ uint32_t y0;
+ uint32_t y1;
+ uint32_t y2;
+ uint32_t y3;
+ uint32_t y4;
+ uint32_t swap;
+
+ for (i = 0; i < 3; ++i) {
+ x1 += x0 >> 26;
+ x0 &= 0x3ffffff;
+ x2 += x1 >> 26;
+ x1 &= 0x3ffffff;
+ x3 += x2 >> 26;
+ x2 &= 0x3ffffff;
+ x4 += x3 >> 26;
+ x3 &= 0x3ffffff;
+ x0 += 5 * (x4 >> 26);
+ x4 &= 0x3ffffff;
+ }
+
+ y0 = x0 + 5;
+ y1 = x1 + (y0 >> 26);
+ y0 &= 0x3ffffff;
+ y2 = x2 + (y1 >> 26);
+ y1 &= 0x3ffffff;
+ y3 = x3 + (y2 >> 26);
+ y2 &= 0x3ffffff;
+ y4 = x4 + (y3 >> 26);
+ y3 &= 0x3ffffff;
+ swap = -(y4 >> 26);
+ y4 &= 0x3ffffff;
+
+ y0 ^= x0;
+ y1 ^= x1;
+ y2 ^= x2;
+ y3 ^= x3;
+ y4 ^= x4;
+
+ y0 &= swap;
+ y1 &= swap;
+ y2 &= swap;
+ y3 &= swap;
+ y4 &= swap;
+
+ y0 ^= x0;
+ y1 ^= x1;
+ y2 ^= x2;
+ y3 ^= x3;
+ y4 ^= x4;
+
+ r->v[0] = y0;
+ r->v[2] = y1;
+ r->v[4] = y2;
+ r->v[6] = y3;
+ r->v[8] = y4;
+}
+
+static void fe1305x2_tobytearray(uint8_t *r, fe1305x2 *x) {
+ uint32_t x0 = x->v[0];
+ uint32_t x1 = x->v[2];
+ uint32_t x2 = x->v[4];
+ uint32_t x3 = x->v[6];
+ uint32_t x4 = x->v[8];
+
+ x1 += x0 >> 26;
+ x0 &= 0x3ffffff;
+ x2 += x1 >> 26;
+ x1 &= 0x3ffffff;
+ x3 += x2 >> 26;
+ x2 &= 0x3ffffff;
+ x4 += x3 >> 26;
+ x3 &= 0x3ffffff;
+
+ *(uint32_t *)r = x0 + (x1 << 26);
+ *(uint32_t *)(r + 4) = (x1 >> 6) + (x2 << 20);
+ *(uint32_t *)(r + 8) = (x2 >> 12) + (x3 << 14);
+ *(uint32_t *)(r + 12) = (x3 >> 18) + (x4 << 8);
+}
+
+// load32 exists to avoid breaking strict aliasing rules in
+// fe1305x2_frombytearray.
+static uint32_t load32(uint8_t *t) {
+ uint32_t tmp;
+ OPENSSL_memcpy(&tmp, t, sizeof(tmp));
+ return tmp;
+}
+
+static void fe1305x2_frombytearray(fe1305x2 *r, const uint8_t *x,
+ unsigned long long xlen) {
+ unsigned i;
+ uint8_t t[17];
+
+ for (i = 0; (i < 16) && (i < xlen); i++) {
+ t[i] = x[i];
+ }
+ xlen -= i;
+ x += i;
+ t[i++] = 1;
+ for (; i < 17; i++) {
+ t[i] = 0;
+ }
+
+ r->v[0] = 0x3ffffff & load32(t);
+ r->v[2] = 0x3ffffff & (load32(t + 3) >> 2);
+ r->v[4] = 0x3ffffff & (load32(t + 6) >> 4);
+ r->v[6] = 0x3ffffff & (load32(t + 9) >> 6);
+ r->v[8] = load32(t + 13);
+
+ if (xlen) {
+ for (i = 0; (i < 16) && (i < xlen); i++) {
+ t[i] = x[i];
+ }
+ t[i++] = 1;
+ for (; i < 17; i++) {
+ t[i] = 0;
+ }
+
+ r->v[1] = 0x3ffffff & load32(t);
+ r->v[3] = 0x3ffffff & (load32(t + 3) >> 2);
+ r->v[5] = 0x3ffffff & (load32(t + 6) >> 4);
+ r->v[7] = 0x3ffffff & (load32(t + 9) >> 6);
+ r->v[9] = load32(t + 13);
+ } else {
+ r->v[1] = r->v[3] = r->v[5] = r->v[7] = r->v[9] = 0;
+ }
+}
+
+static const alignas(16) fe1305x2 zero;
+
+struct poly1305_state_st {
+ uint8_t data[sizeof(fe1305x2[5]) + 128];
+ uint8_t buf[32];
+ unsigned int buf_used;
+ uint8_t key[16];
+};
+
+void CRYPTO_poly1305_init_neon(poly1305_state *state, const uint8_t key[32]) {
+ struct poly1305_state_st *st = (struct poly1305_state_st *)(state);
+ fe1305x2 *const r = (fe1305x2 *)(st->data + (15 & (-(int)st->data)));
+ fe1305x2 *const h = r + 1;
+ fe1305x2 *const c = h + 1;
+ fe1305x2 *const precomp = c + 1;
+ unsigned int j;
+
+ r->v[1] = r->v[0] = 0x3ffffff & *(uint32_t *)key;
+ r->v[3] = r->v[2] = 0x3ffff03 & ((*(uint32_t *)(key + 3)) >> 2);
+ r->v[5] = r->v[4] = 0x3ffc0ff & ((*(uint32_t *)(key + 6)) >> 4);
+ r->v[7] = r->v[6] = 0x3f03fff & ((*(uint32_t *)(key + 9)) >> 6);
+ r->v[9] = r->v[8] = 0x00fffff & ((*(uint32_t *)(key + 12)) >> 8);
+
+ for (j = 0; j < 10; j++) {
+ h->v[j] = 0; // XXX: should fast-forward a bit
+ }
+
+ addmulmod(precomp, r, r, &zero); // precompute r^2
+ addmulmod(precomp + 1, precomp, precomp, &zero); // precompute r^4
+
+ OPENSSL_memcpy(st->key, key + 16, 16);
+ st->buf_used = 0;
+}
+
+void CRYPTO_poly1305_update_neon(poly1305_state *state, const uint8_t *in,
+ size_t in_len) {
+ struct poly1305_state_st *st = (struct poly1305_state_st *)(state);
+ fe1305x2 *const r = (fe1305x2 *)(st->data + (15 & (-(int)st->data)));
+ fe1305x2 *const h = r + 1;
+ fe1305x2 *const c = h + 1;
+ fe1305x2 *const precomp = c + 1;
+ unsigned int i;
+
+ if (st->buf_used) {
+ unsigned int todo = 32 - st->buf_used;
+ if (todo > in_len) {
+ todo = in_len;
+ }
+ for (i = 0; i < todo; i++) {
+ st->buf[st->buf_used + i] = in[i];
+ }
+ st->buf_used += todo;
+ in_len -= todo;
+ in += todo;
+
+ if (st->buf_used == sizeof(st->buf) && in_len) {
+ addmulmod(h, h, precomp, &zero);
+ fe1305x2_frombytearray(c, st->buf, sizeof(st->buf));
+ for (i = 0; i < 10; i++) {
+ h->v[i] += c->v[i];
+ }
+ st->buf_used = 0;
+ }
+ }
+
+ while (in_len > 32) {
+ unsigned int tlen = 1048576;
+ if (in_len < tlen) {
+ tlen = in_len;
+ }
+ tlen -= blocks(h, precomp, in, tlen);
+ in_len -= tlen;
+ in += tlen;
+ }
+
+ if (in_len) {
+ for (i = 0; i < in_len; i++) {
+ st->buf[i] = in[i];
+ }
+ st->buf_used = in_len;
+ }
+}
+
+void CRYPTO_poly1305_finish_neon(poly1305_state *state, uint8_t mac[16]) {
+ struct poly1305_state_st *st = (struct poly1305_state_st *)(state);
+ fe1305x2 *const r = (fe1305x2 *)(st->data + (15 & (-(int)st->data)));
+ fe1305x2 *const h = r + 1;
+ fe1305x2 *const c = h + 1;
+ fe1305x2 *const precomp = c + 1;
+
+ addmulmod(h, h, precomp, &zero);
+
+ if (st->buf_used > 16) {
+ fe1305x2_frombytearray(c, st->buf, st->buf_used);
+ precomp->v[1] = r->v[1];
+ precomp->v[3] = r->v[3];
+ precomp->v[5] = r->v[5];
+ precomp->v[7] = r->v[7];
+ precomp->v[9] = r->v[9];
+ addmulmod(h, h, precomp, c);
+ } else if (st->buf_used > 0) {
+ fe1305x2_frombytearray(c, st->buf, st->buf_used);
+ r->v[1] = 1;
+ r->v[3] = 0;
+ r->v[5] = 0;
+ r->v[7] = 0;
+ r->v[9] = 0;
+ addmulmod(h, h, r, c);
+ }
+
+ h->v[0] += h->v[1];
+ h->v[2] += h->v[3];
+ h->v[4] += h->v[5];
+ h->v[6] += h->v[7];
+ h->v[8] += h->v[9];
+ freeze(h);
+
+ fe1305x2_frombytearray(c, st->key, 16);
+ c->v[8] ^= (1 << 24);
+
+ h->v[0] += c->v[0];
+ h->v[2] += c->v[2];
+ h->v[4] += c->v[4];
+ h->v[6] += c->v[6];
+ h->v[8] += c->v[8];
+ fe1305x2_tobytearray(mac, h);
+}
+
+#endif // OPENSSL_POLY1305_NEON
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