mirror of
https://github.com/reactos/ccache.git
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201 lines
4.7 KiB
C
201 lines
4.7 KiB
C
/*
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* Copyright (C) 1997-1998 Andrew Tridgell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "ccache.h"
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/* NOTE: This code makes no attempt to be fast! */
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static struct mdfour *m;
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#define MASK32 (0xffffffff)
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#define F(X,Y,Z) ((((X)&(Y)) | ((~(X))&(Z))))
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#define G(X,Y,Z) ((((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z))))
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#define H(X,Y,Z) (((X)^(Y)^(Z)))
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#define lshift(x,s) (((((x)<<(s))&MASK32) | (((x)>>(32-(s)))&MASK32)))
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#define ROUND1(a,b,c,d,k,s) a = lshift((a + F(b,c,d) + M[k])&MASK32, s)
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#define ROUND2(a,b,c,d,k,s) a = lshift((a + G(b,c,d) + M[k] + 0x5A827999)&MASK32,s)
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#define ROUND3(a,b,c,d,k,s) a = lshift((a + H(b,c,d) + M[k] + 0x6ED9EBA1)&MASK32,s)
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/* this applies md4 to 64 byte chunks */
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static void
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mdfour64(uint32_t *M)
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{
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uint32_t AA, BB, CC, DD;
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uint32_t A,B,C,D;
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A = m->A; B = m->B; C = m->C; D = m->D;
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AA = A; BB = B; CC = C; DD = D;
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ROUND1(A,B,C,D, 0, 3); ROUND1(D,A,B,C, 1, 7);
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ROUND1(C,D,A,B, 2, 11); ROUND1(B,C,D,A, 3, 19);
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ROUND1(A,B,C,D, 4, 3); ROUND1(D,A,B,C, 5, 7);
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ROUND1(C,D,A,B, 6, 11); ROUND1(B,C,D,A, 7, 19);
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ROUND1(A,B,C,D, 8, 3); ROUND1(D,A,B,C, 9, 7);
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ROUND1(C,D,A,B, 10, 11); ROUND1(B,C,D,A, 11, 19);
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ROUND1(A,B,C,D, 12, 3); ROUND1(D,A,B,C, 13, 7);
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ROUND1(C,D,A,B, 14, 11); ROUND1(B,C,D,A, 15, 19);
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ROUND2(A,B,C,D, 0, 3); ROUND2(D,A,B,C, 4, 5);
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ROUND2(C,D,A,B, 8, 9); ROUND2(B,C,D,A, 12, 13);
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ROUND2(A,B,C,D, 1, 3); ROUND2(D,A,B,C, 5, 5);
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ROUND2(C,D,A,B, 9, 9); ROUND2(B,C,D,A, 13, 13);
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ROUND2(A,B,C,D, 2, 3); ROUND2(D,A,B,C, 6, 5);
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ROUND2(C,D,A,B, 10, 9); ROUND2(B,C,D,A, 14, 13);
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ROUND2(A,B,C,D, 3, 3); ROUND2(D,A,B,C, 7, 5);
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ROUND2(C,D,A,B, 11, 9); ROUND2(B,C,D,A, 15, 13);
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ROUND3(A,B,C,D, 0, 3); ROUND3(D,A,B,C, 8, 9);
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ROUND3(C,D,A,B, 4, 11); ROUND3(B,C,D,A, 12, 15);
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ROUND3(A,B,C,D, 2, 3); ROUND3(D,A,B,C, 10, 9);
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ROUND3(C,D,A,B, 6, 11); ROUND3(B,C,D,A, 14, 15);
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ROUND3(A,B,C,D, 1, 3); ROUND3(D,A,B,C, 9, 9);
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ROUND3(C,D,A,B, 5, 11); ROUND3(B,C,D,A, 13, 15);
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ROUND3(A,B,C,D, 3, 3); ROUND3(D,A,B,C, 11, 9);
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ROUND3(C,D,A,B, 7, 11); ROUND3(B,C,D,A, 15, 15);
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A += AA; B += BB;
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C += CC; D += DD;
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A &= MASK32; B &= MASK32;
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C &= MASK32; D &= MASK32;
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m->A = A; m->B = B; m->C = C; m->D = D;
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}
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static void
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copy64(uint32_t *M, const unsigned char *in)
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{
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int i;
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for (i = 0; i < 16; i++)
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M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
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(in[i*4+1]<<8) | (in[i*4+0]<<0);
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}
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static void
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copy4(unsigned char *out, uint32_t x)
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{
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out[0] = x&0xFF;
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out[1] = (x>>8)&0xFF;
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out[2] = (x>>16)&0xFF;
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out[3] = (x>>24)&0xFF;
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}
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void
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mdfour_begin(struct mdfour *md)
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{
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md->A = 0x67452301;
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md->B = 0xefcdab89;
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md->C = 0x98badcfe;
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md->D = 0x10325476;
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md->totalN = 0;
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md->tail_len = 0;
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md->finalized = 0;
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}
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static
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void mdfour_tail(const unsigned char *in, size_t n)
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{
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unsigned char buf[128] = { 0 };
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uint32_t M[16];
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uint32_t b;
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m->totalN += n;
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b = m->totalN * 8;
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if (n) memcpy(buf, in, n);
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buf[n] = 0x80;
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if (n <= 55) {
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copy4(buf+56, b);
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copy64(M, buf);
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mdfour64(M);
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} else {
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copy4(buf+120, b);
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copy64(M, buf);
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mdfour64(M);
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copy64(M, buf+64);
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mdfour64(M);
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}
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}
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void
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mdfour_update(struct mdfour *md, const unsigned char *in, size_t n)
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{
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uint32_t M[16];
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#ifdef CCACHE_DEBUG_HASH
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if (getenv("CCACHE_DEBUG_HASH")) {
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FILE* f = fopen("ccache-debug-hash.bin", "a");
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fwrite(in, 1, n, f);
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fclose(f);
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}
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#endif
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m = md;
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if (in == NULL) {
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if (!md->finalized) {
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mdfour_tail(md->tail, md->tail_len);
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md->finalized = 1;
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}
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return;
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}
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if (md->tail_len) {
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size_t len = 64 - md->tail_len;
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if (len > n) len = n;
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memcpy(md->tail+md->tail_len, in, len);
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md->tail_len += len;
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n -= len;
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in += len;
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if (md->tail_len == 64) {
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copy64(M, md->tail);
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mdfour64(M);
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m->totalN += 64;
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md->tail_len = 0;
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}
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}
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while (n >= 64) {
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copy64(M, in);
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mdfour64(M);
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in += 64;
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n -= 64;
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m->totalN += 64;
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}
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if (n) {
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memcpy(md->tail, in, n);
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md->tail_len = n;
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}
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}
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void
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mdfour_result(struct mdfour *md, unsigned char *out)
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{
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copy4(out, md->A);
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copy4(out+4, md->B);
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copy4(out+8, md->C);
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copy4(out+12, md->D);
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}
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