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/*
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "inner.h"
/*
* This is the 64-bit variant of br_ghash_ctmul32(), with 64-bit operands
* and bit reversal of 64-bit words.
*/
static inline uint64_t
bmul64(uint64_t x, uint64_t y)
{
uint64_t x0, x1, x2, x3;
uint64_t y0, y1, y2, y3;
uint64_t z0, z1, z2, z3;
x0 = x & (uint64_t)0x1111111111111111;
x1 = x & (uint64_t)0x2222222222222222;
x2 = x & (uint64_t)0x4444444444444444;
x3 = x & (uint64_t)0x8888888888888888;
y0 = y & (uint64_t)0x1111111111111111;
y1 = y & (uint64_t)0x2222222222222222;
y2 = y & (uint64_t)0x4444444444444444;
y3 = y & (uint64_t)0x8888888888888888;
z0 = (x0 * y0) ^ (x1 * y3) ^ (x2 * y2) ^ (x3 * y1);
z1 = (x0 * y1) ^ (x1 * y0) ^ (x2 * y3) ^ (x3 * y2);
z2 = (x0 * y2) ^ (x1 * y1) ^ (x2 * y0) ^ (x3 * y3);
z3 = (x0 * y3) ^ (x1 * y2) ^ (x2 * y1) ^ (x3 * y0);
z0 &= (uint64_t)0x1111111111111111;
z1 &= (uint64_t)0x2222222222222222;
z2 &= (uint64_t)0x4444444444444444;
z3 &= (uint64_t)0x8888888888888888;
return z0 | z1 | z2 | z3;
}
static uint64_t
rev64(uint64_t x)
{
#define RMS(m, s) do { \
x = ((x & (uint64_t)(m)) << (s)) \
| ((x >> (s)) & (uint64_t)(m)); \
} while (0)
RMS(0x5555555555555555, 1);
RMS(0x3333333333333333, 2);
RMS(0x0F0F0F0F0F0F0F0F, 4);
RMS(0x00FF00FF00FF00FF, 8);
RMS(0x0000FFFF0000FFFF, 16);
return (x << 32) | (x >> 32);
#undef RMS
}
/* see bearssl_ghash.h */
void
br_ghash_ctmul64(void *y, const void *h, const void *data, size_t len)
{
const unsigned char *buf, *hb;
unsigned char *yb;
uint64_t y0, y1;
uint64_t h0, h1, h2, h0r, h1r, h2r;
buf = data;
yb = y;
hb = h;
y1 = br_dec64be(yb);
y0 = br_dec64be(yb + 8);
h1 = br_dec64be(hb);
h0 = br_dec64be(hb + 8);
h0r = rev64(h0);
h1r = rev64(h1);
h2 = h0 ^ h1;
h2r = h0r ^ h1r;
while (len > 0) {
const unsigned char *src;
unsigned char tmp[16];
uint64_t y0r, y1r, y2, y2r;
uint64_t z0, z1, z2, z0h, z1h, z2h;
uint64_t v0, v1, v2, v3;
if (len >= 16) {
src = buf;
buf += 16;
len -= 16;
} else {
memcpy(tmp, buf, len);
memset(tmp + len, 0, (sizeof tmp) - len);
src = tmp;
len = 0;
}
y1 ^= br_dec64be(src);
y0 ^= br_dec64be(src + 8);
y0r = rev64(y0);
y1r = rev64(y1);
y2 = y0 ^ y1;
y2r = y0r ^ y1r;
z0 = bmul64(y0, h0);
z1 = bmul64(y1, h1);
z2 = bmul64(y2, h2);
z0h = bmul64(y0r, h0r);
z1h = bmul64(y1r, h1r);
z2h = bmul64(y2r, h2r);
z2 ^= z0 ^ z1;
z2h ^= z0h ^ z1h;
z0h = rev64(z0h) >> 1;
z1h = rev64(z1h) >> 1;
z2h = rev64(z2h) >> 1;
v0 = z0;
v1 = z0h ^ z2;
v2 = z1 ^ z2h;
v3 = z1h;
v3 = (v3 << 1) | (v2 >> 63);
v2 = (v2 << 1) | (v1 >> 63);
v1 = (v1 << 1) | (v0 >> 63);
v0 = (v0 << 1);
v2 ^= v0 ^ (v0 >> 1) ^ (v0 >> 2) ^ (v0 >> 7);
v1 ^= (v0 << 63) ^ (v0 << 62) ^ (v0 << 57);
v3 ^= v1 ^ (v1 >> 1) ^ (v1 >> 2) ^ (v1 >> 7);
v2 ^= (v1 << 63) ^ (v1 << 62) ^ (v1 << 57);
y0 = v2;
y1 = v3;
}
br_enc64be(yb, y1);
br_enc64be(yb + 8, y0);
}
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