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// Copyright (C) 1997-1998 Andrew Tridgell
// Copyright (C) 2009-2016 Joel Rosdahl
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#include "ccache.h"
// NOTE: This code makes no attempt to be fast!
static struct mdfour *m;
#define MASK32 (0xffffffff)
#define F(X, Y, Z) ((((X)&(Y)) | ((~(X))&(Z))))
#define G(X, Y, Z) ((((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z))))
#define H(X, Y, Z) (((X)^(Y)^(Z)))
#define lshift(x, s) (((((x)<<(s))&MASK32) | (((x)>>(32-(s)))&MASK32)))
#define ROUND1(a, b, c, d, k, s) \
a = lshift((a + F(b, c, d) + M[k])&MASK32, s)
#define ROUND2(a, b, c, d, k, s) \
a = lshift((a + G(b, c, d) + M[k] + 0x5A827999)&MASK32, s)
#define ROUND3(a, b, c, d, k, s) \
a = lshift((a + H(b, c, d) + M[k] + 0x6ED9EBA1)&MASK32, s)
// This applies md4 to 64 byte chunks.
static void
mdfour64(uint32_t *M)
{
uint32_t AA, BB, CC, DD;
uint32_t A, B, C, D;
A = m->A;
B = m->B;
C = m->C;
D = m->D;
AA = A;
BB = B;
CC = C;
DD = D;
ROUND1(A, B, C, D, 0, 3); ROUND1(D, A, B, C, 1, 7);
ROUND1(C, D, A, B, 2, 11); ROUND1(B, C, D, A, 3, 19);
ROUND1(A, B, C, D, 4, 3); ROUND1(D, A, B, C, 5, 7);
ROUND1(C, D, A, B, 6, 11); ROUND1(B, C, D, A, 7, 19);
ROUND1(A, B, C, D, 8, 3); ROUND1(D, A, B, C, 9, 7);
ROUND1(C, D, A, B, 10, 11); ROUND1(B, C, D, A, 11, 19);
ROUND1(A, B, C, D, 12, 3); ROUND1(D, A, B, C, 13, 7);
ROUND1(C, D, A, B, 14, 11); ROUND1(B, C, D, A, 15, 19);
ROUND2(A, B, C, D, 0, 3); ROUND2(D, A, B, C, 4, 5);
ROUND2(C, D, A, B, 8, 9); ROUND2(B, C, D, A, 12, 13);
ROUND2(A, B, C, D, 1, 3); ROUND2(D, A, B, C, 5, 5);
ROUND2(C, D, A, B, 9, 9); ROUND2(B, C, D, A, 13, 13);
ROUND2(A, B, C, D, 2, 3); ROUND2(D, A, B, C, 6, 5);
ROUND2(C, D, A, B, 10, 9); ROUND2(B, C, D, A, 14, 13);
ROUND2(A, B, C, D, 3, 3); ROUND2(D, A, B, C, 7, 5);
ROUND2(C, D, A, B, 11, 9); ROUND2(B, C, D, A, 15, 13);
ROUND3(A, B, C, D, 0, 3); ROUND3(D, A, B, C, 8, 9);
ROUND3(C, D, A, B, 4, 11); ROUND3(B, C, D, A, 12, 15);
ROUND3(A, B, C, D, 2, 3); ROUND3(D, A, B, C, 10, 9);
ROUND3(C, D, A, B, 6, 11); ROUND3(B, C, D, A, 14, 15);
ROUND3(A, B, C, D, 1, 3); ROUND3(D, A, B, C, 9, 9);
ROUND3(C, D, A, B, 5, 11); ROUND3(B, C, D, A, 13, 15);
ROUND3(A, B, C, D, 3, 3); ROUND3(D, A, B, C, 11, 9);
ROUND3(C, D, A, B, 7, 11); ROUND3(B, C, D, A, 15, 15);
A += AA;
B += BB;
C += CC;
D += DD;
A &= MASK32;
B &= MASK32;
C &= MASK32;
D &= MASK32;
m->A = A;
m->B = B;
m->C = C;
m->D = D;
}
static void
copy64(uint32_t *M, const unsigned char *in)
{
#ifdef WORDS_BIGENDIAN
for (int i = 0; i < 16; i++) {
M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
(in[i*4+1]<<8) | (in[i*4+0]<<0);
}
#else
memcpy(M, in, 16*4);
#endif
}
static void
copy4(unsigned char *out, uint32_t x)
{
#ifdef WORDS_BIGENDIAN
out[0] = x&0xFF;
out[1] = (x>>8)&0xFF;
out[2] = (x>>16)&0xFF;
out[3] = (x>>24)&0xFF;
#else
memcpy(out, &x, 4);
#endif
}
void
mdfour_begin(struct mdfour *md)
{
md->A = 0x67452301;
md->B = 0xefcdab89;
md->C = 0x98badcfe;
md->D = 0x10325476;
md->totalN = 0;
md->tail_len = 0;
md->finalized = 0;
}
static
void mdfour_tail(const unsigned char *in, size_t n)
{
m->totalN += n;
uint32_t b = m->totalN * 8;
unsigned char buf[128] = { 0 };
uint32_t M[16];
if (n) {
memcpy(buf, in, n);
}
buf[n] = 0x80;
if (n <= 55) {
copy4(buf+56, b);
copy64(M, buf);
mdfour64(M);
} else {
copy4(buf+120, b);
copy64(M, buf);
mdfour64(M);
copy64(M, buf+64);
mdfour64(M);
}
}
void
mdfour_update(struct mdfour *md, const unsigned char *in, size_t n)
{
#ifdef CCACHE_DEBUG_HASH
if (getenv("CCACHE_DEBUG_HASH")) {
FILE *f = fopen("ccache-debug-hash.bin", "a");
fwrite(in, 1, n, f);
fclose(f);
}
#endif
m = md;
if (!in) {
if (!md->finalized) {
mdfour_tail(md->tail, md->tail_len);
md->finalized = 1;
}
return;
}
uint32_t M[16];
if (md->tail_len) {
size_t len = 64 - md->tail_len;
if (len > n) {
len = n;
}
memcpy(md->tail+md->tail_len, in, len);
md->tail_len += len;
n -= len;
in += len;
if (md->tail_len == 64) {
copy64(M, md->tail);
mdfour64(M);
m->totalN += 64;
md->tail_len = 0;
}
}
while (n >= 64) {
copy64(M, in);
mdfour64(M);
in += 64;
n -= 64;
m->totalN += 64;
}
if (n) {
memcpy(md->tail, in, n);
md->tail_len = n;
}
}
void
mdfour_result(struct mdfour *md, unsigned char *out)
{
copy4(out, md->A);
copy4(out+4, md->B);
copy4(out+8, md->C);
copy4(out+12, md->D);
}
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