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