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/*
* Copyright (c) 2015, Vsevolod Stakhov
* Copyright (c) 2015, Andrew Moon
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "blake2.h"
#include "blake2-internal.h"
typedef uint64_t blake2b_uint64;
static const unsigned char blake2b_sigma[12][16] = {
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
{14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3},
{11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4},
{7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8},
{9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13},
{2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9},
{12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11},
{13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10},
{6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5},
{10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0},
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
{14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3}
};
static blake2b_uint64
ROTR64 (blake2b_uint64 x, int k)
{
return ((x >> k) | (x << (64 - k)));
}
static blake2b_uint64
U8TO64 (const unsigned char *p)
{
return
((blake2b_uint64) p[0]) |
((blake2b_uint64) p[1] << 8) |
((blake2b_uint64) p[2] << 16) |
((blake2b_uint64) p[3] << 24) |
((blake2b_uint64) p[4] << 32) |
((blake2b_uint64) p[5] << 40) |
((blake2b_uint64) p[6] << 48) |
((blake2b_uint64) p[7] << 56);
}
static void
U64TO8 (unsigned char *p, blake2b_uint64 v)
{
p[0] = (v) & 0xff;
p[1] = (v >> 8) & 0xff;
p[2] = (v >> 16) & 0xff;
p[3] = (v >> 24) & 0xff;
p[4] = (v >> 32) & 0xff;
p[5] = (v >> 40) & 0xff;
p[6] = (v >> 48) & 0xff;
p[7] = (v >> 56) & 0xff;
}
void
blake2b_blocks_ref (blake2b_state_internal *S,
const unsigned char *in,
size_t bytes,
size_t stride)
{
const blake2b_uint64 f0 = U8TO64 (&S->f[0]);
const blake2b_uint64 f1 = U8TO64 (&S->f[8]);
const blake2b_uint64 w8 = 0x6a09e667f3bcc908ull;
const blake2b_uint64 w9 = 0xbb67ae8584caa73bull;
const blake2b_uint64 w10 = 0x3c6ef372fe94f82bull;
const blake2b_uint64 w11 = 0xa54ff53a5f1d36f1ull;
const blake2b_uint64 w12 = 0x510e527fade682d1ull;
const blake2b_uint64 w13 = 0x9b05688c2b3e6c1full;
const blake2b_uint64 w14 = 0x1f83d9abfb41bd6bull ^f0;
const blake2b_uint64 w15 = 0x5be0cd19137e2179ull ^f1;
const size_t inc = (bytes >= 128) ? 128 : bytes;
blake2b_uint64 t0 = U8TO64 (&S->t[0]);
blake2b_uint64 t1 = U8TO64 (&S->t[8]);
blake2b_uint64 h[8];
blake2b_uint64 v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, v13, v14, v15;
unsigned char buffer[128];
size_t i;
if (f0) {
memset (buffer, 0, sizeof (buffer));
memcpy (buffer, in, bytes);
in = buffer;
}
for (i = 0; i < 8; i++)
h[i] = U8TO64 (&S->h[i * 8]);
while (1) {
blake2b_uint64 m[16];
t0 += inc;
if (t0 < inc)
t1 += 1;
for (i = 0; i < 16; i++)
m[i] = U8TO64 (in + (i * 8));
v0 = h[0];
v1 = h[1];
v2 = h[2];
v3 = h[3];
v4 = h[4];
v5 = h[5];
v6 = h[6];
v7 = h[7];
v8 = w8;
v9 = w9;
v10 = w10;
v11 = w11;
v12 = w12 ^ t0;
v13 = w13 ^ t1;
v14 = w14;
v15 = w15;
#define G(r, x, a, b, c, d) \
a += b + m[blake2b_sigma[r][2*x+0]]; \
d = ROTR64(d ^ a, 32); \
c += d; \
b = ROTR64(b ^ c, 24); \
a += b + m[blake2b_sigma[r][2*x+1]]; \
d = ROTR64(d ^ a, 16); \
c += d; \
b = ROTR64(b ^ c, 63);
for (i = 0; i < 12; i++) {
G(i, 0, v0, v4, v8, v12);
G(i, 1, v1, v5, v9, v13);
G(i, 2, v2, v6, v10, v14);
G(i, 3, v3, v7, v11, v15);
G(i, 4, v0, v5, v10, v15);
G(i, 5, v1, v6, v11, v12);
G(i, 6, v2, v7, v8, v13);
G(i, 7, v3, v4, v9, v14);
}
h[0] ^= (v0 ^ v8);
h[1] ^= (v1 ^ v9);
h[2] ^= (v2 ^ v10);
h[3] ^= (v3 ^ v11);
h[4] ^= (v4 ^ v12);
h[5] ^= (v5 ^ v13);
h[6] ^= (v6 ^ v14);
h[7] ^= (v7 ^ v15);
if (bytes <= 128)
break;
in += stride;
bytes -= 128;
}
for (i = 0; i < 8; i++)
U64TO8 (&S->h[i * 8], h[i]);
U64TO8 (&S->t[0], t0);
U64TO8 (&S->t[8], t1);
}
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