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- /* 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>
-
- #if defined(OPENSSL_ARM) && !defined(OPENSSL_NO_ASM)
-
- #include <string.h>
-
-
- 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;
- memcpy(&tmp, t, sizeof(tmp));
- return tmp;
- }
-
- static void fe1305x2_frombytearray(fe1305x2 *r, const uint8_t *x,
- unsigned long long xlen) {
- int 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 fe1305x2 zero __attribute__((aligned(16)));
-
- 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 */
-
- 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_ARM && !OPENSSL_NO_ASM */
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