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/*
* fontconfig/src/fchash.c
*
* Copyright © 2003 Keith Packard
* Copyright © 2013 Red Hat, Inc.
* Copyright © 2014 Google, Inc.
* Red Hat Author(s): Akira TAGOH
* Google Author(s): Behdad Esfahbod
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the author(s) not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. The authors make no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, 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.
*/
#include "fcint.h"
#include <stdio.h>
#include <string.h>
/* SHA256 */
#define ROTRN(w, v, n) ((((FcChar32)v) >> n) | (((FcChar32)v) << (w - n)))
#define ROTR32(v, n) ROTRN(32, v, n)
#define SHR(v, n) (v >> n)
#define Ch(x, y, z) ((x & y) ^ (~x & z))
#define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
#define SS0(x) (ROTR32(x, 2) ^ ROTR32(x, 13) ^ ROTR32(x, 22))
#define SS1(x) (ROTR32(x, 6) ^ ROTR32(x, 11) ^ ROTR32(x, 25))
#define ss0(x) (ROTR32(x, 7) ^ ROTR32(x, 18) ^ SHR(x, 3))
#define ss1(x) (ROTR32(x, 17) ^ ROTR32(x, 19) ^ SHR(x, 10))
void
FcHashInitDigest (FcHashDigest digest)
{
static const FcHashDigest init = {
0x6a09e667UL, 0xbb67ae85UL, 0x3c6ef372UL, 0xa54ff53aUL,
0x510e527fUL, 0x9b05688cUL, 0x1f83d9abUL, 0x5be0cd19UL
};
memcpy (digest, init, sizeof (FcHashDigest));
}
void
FcHashDigestAddBlock (FcHashDigest digest,
const char block[64])
{
static const FcChar32 k[] = {
0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
};
FcChar32 w[64], i, j, t1, t2;
FcChar32 a, b, c, d, e, f, g, h;
#define H(n) (digest[n])
a = H(0);
b = H(1);
c = H(2);
d = H(3);
e = H(4);
f = H(5);
g = H(6);
h = H(7);
for (i = 0; i < 16; i++)
{
j = (block[(i * 4) + 0] & 0xff) << (8 * 3);
j |= (block[(i * 4) + 1] & 0xff) << (8 * 2);
j |= (block[(i * 4) + 2] & 0xff) << (8 * 1);
j |= (block[(i * 4) + 3] & 0xff);
w[i] = j;
}
for (i = 16; i < 64; i++)
w[i] = ss1(w[i - 2]) + w[i - 7] + ss0(w[i - 15]) + w[i - 16];
for (i = 0; i < 64; i++)
{
t1 = h + SS1(e) + Ch(e, f, g) + k[i] + w[i];
t2 = SS0(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + t1;
d = c;
c = b;
b = a;
a = t1 + t2;
}
H(0) += a;
H(1) += b;
H(2) += c;
H(3) += d;
H(4) += e;
H(5) += f;
H(6) += g;
H(7) += h;
#undef H
}
void
FcHashDigestFinish (FcHashDigest digest,
const char *residual, /* < 64 bytes */
size_t total_len)
{
char ibuf[64];
unsigned int len = total_len % 64;
uint64_t v;
if (!len)
return;
memcpy (ibuf, residual, len);
memset (ibuf + len, 0, 64 - len);
ibuf[len] = 0x80;
if ((64 - len) < 9)
{
FcHashDigestAddBlock (digest, ibuf);
memset (ibuf, 0, 64);
}
/* set input size at the end */
v = (uint64_t) total_len * 8;
ibuf[63 - 0] = v & 0xff;
ibuf[63 - 1] = (v >> 8) & 0xff;
ibuf[63 - 2] = (v >> 16) & 0xff;
ibuf[63 - 3] = (v >> 24) & 0xff;
ibuf[63 - 4] = (v >> 32) & 0xff;
ibuf[63 - 5] = (v >> 40) & 0xff;
ibuf[63 - 6] = (v >> 48) & 0xff;
ibuf[63 - 7] = (v >> 56) & 0xff;
FcHashDigestAddBlock (digest, ibuf);
}
FcChar8 *
FcHashToString (const FcHashDigest digest)
{
FcChar8 *ret = NULL;
static const char hex[] = "0123456789abcdef";
int i, j;
ret = malloc (sizeof (FcChar8) * (8 * 8 + 7 + 1));
if (!ret)
return NULL;
memcpy (ret, "sha256:", 7);
#define H(n) digest[n]
for (i = 0; i < 8; i++)
{
FcChar32 v = H(i);
for (j = 0; j < 8; j++)
ret[7 + (i * 8) + j] = hex[(v >> (28 - j * 4)) & 0xf];
}
ret[7 + i * 8] = 0;
#undef H
return ret;
}
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