| /* 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) |
| |
| 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 */ |