mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-21 09:21:08 +00:00
295 lines
7.4 KiB
C++
295 lines
7.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
|
|
*
|
|
* ScummVM is the legal property of its developers, whose names
|
|
* are too numerous to list here. Please refer to the COPYRIGHT
|
|
* file distributed with this source distribution.
|
|
*
|
|
* 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 2
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* RFC 1321 compliant MD5 implementation,
|
|
* by Christophe Devine <devine(at)cr0.net>
|
|
* this program is licensed under the GPL.
|
|
*/
|
|
|
|
#include "common/md5.h"
|
|
#include "common/endian.h"
|
|
#include "common/str.h"
|
|
#include "common/stream.h"
|
|
|
|
namespace Common {
|
|
|
|
struct md5_context {
|
|
uint32 total[2];
|
|
uint32 state[4];
|
|
uint8 buffer[64];
|
|
};
|
|
|
|
static void md5_starts(md5_context *ctx);
|
|
static void md5_update(md5_context *ctx, const uint8 *input, uint32 length);
|
|
static void md5_finish(md5_context *ctx, uint8 digest[16]);
|
|
|
|
|
|
#define GET_UINT32(n, b, i) (n) = READ_LE_UINT32(b + i)
|
|
#define PUT_UINT32(n, b, i) WRITE_LE_UINT32(b + i, n)
|
|
|
|
void md5_starts(md5_context *ctx) {
|
|
ctx->total[0] = 0;
|
|
ctx->total[1] = 0;
|
|
|
|
ctx->state[0] = 0x67452301;
|
|
ctx->state[1] = 0xEFCDAB89;
|
|
ctx->state[2] = 0x98BADCFE;
|
|
ctx->state[3] = 0x10325476;
|
|
}
|
|
|
|
static void md5_process(md5_context *ctx, const uint8 data[64]) {
|
|
uint32 X[16], A, B, C, D;
|
|
|
|
GET_UINT32(X[0], data, 0);
|
|
GET_UINT32(X[1], data, 4);
|
|
GET_UINT32(X[2], data, 8);
|
|
GET_UINT32(X[3], data, 12);
|
|
GET_UINT32(X[4], data, 16);
|
|
GET_UINT32(X[5], data, 20);
|
|
GET_UINT32(X[6], data, 24);
|
|
GET_UINT32(X[7], data, 28);
|
|
GET_UINT32(X[8], data, 32);
|
|
GET_UINT32(X[9], data, 36);
|
|
GET_UINT32(X[10], data, 40);
|
|
GET_UINT32(X[11], data, 44);
|
|
GET_UINT32(X[12], data, 48);
|
|
GET_UINT32(X[13], data, 52);
|
|
GET_UINT32(X[14], data, 56);
|
|
GET_UINT32(X[15], data, 60);
|
|
|
|
#define S(x, n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
|
|
|
|
#define P(a, b, c, d, k, s, t) \
|
|
{ \
|
|
a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
|
|
}
|
|
|
|
A = ctx->state[0];
|
|
B = ctx->state[1];
|
|
C = ctx->state[2];
|
|
D = ctx->state[3];
|
|
|
|
#define F(x, y, z) (z ^ (x & (y ^ z)))
|
|
|
|
P(A, B, C, D, 0, 7, 0xD76AA478);
|
|
P(D, A, B, C, 1, 12, 0xE8C7B756);
|
|
P(C, D, A, B, 2, 17, 0x242070DB);
|
|
P(B, C, D, A, 3, 22, 0xC1BDCEEE);
|
|
P(A, B, C, D, 4, 7, 0xF57C0FAF);
|
|
P(D, A, B, C, 5, 12, 0x4787C62A);
|
|
P(C, D, A, B, 6, 17, 0xA8304613);
|
|
P(B, C, D, A, 7, 22, 0xFD469501);
|
|
P(A, B, C, D, 8, 7, 0x698098D8);
|
|
P(D, A, B, C, 9, 12, 0x8B44F7AF);
|
|
P(C, D, A, B, 10, 17, 0xFFFF5BB1);
|
|
P(B, C, D, A, 11, 22, 0x895CD7BE);
|
|
P(A, B, C, D, 12, 7, 0x6B901122);
|
|
P(D, A, B, C, 13, 12, 0xFD987193);
|
|
P(C, D, A, B, 14, 17, 0xA679438E);
|
|
P(B, C, D, A, 15, 22, 0x49B40821);
|
|
|
|
#undef F
|
|
|
|
#define F(x, y, z) (y ^ (z & (x ^ y)))
|
|
|
|
P(A, B, C, D, 1, 5, 0xF61E2562);
|
|
P(D, A, B, C, 6, 9, 0xC040B340);
|
|
P(C, D, A, B, 11, 14, 0x265E5A51);
|
|
P(B, C, D, A, 0, 20, 0xE9B6C7AA);
|
|
P(A, B, C, D, 5, 5, 0xD62F105D);
|
|
P(D, A, B, C, 10, 9, 0x02441453);
|
|
P(C, D, A, B, 15, 14, 0xD8A1E681);
|
|
P(B, C, D, A, 4, 20, 0xE7D3FBC8);
|
|
P(A, B, C, D, 9, 5, 0x21E1CDE6);
|
|
P(D, A, B, C, 14, 9, 0xC33707D6);
|
|
P(C, D, A, B, 3, 14, 0xF4D50D87);
|
|
P(B, C, D, A, 8, 20, 0x455A14ED);
|
|
P(A, B, C, D, 13, 5, 0xA9E3E905);
|
|
P(D, A, B, C, 2, 9, 0xFCEFA3F8);
|
|
P(C, D, A, B, 7, 14, 0x676F02D9);
|
|
P(B, C, D, A, 12, 20, 0x8D2A4C8A);
|
|
|
|
#undef F
|
|
|
|
#define F(x, y, z) (x ^ y ^ z)
|
|
|
|
P(A, B, C, D, 5, 4, 0xFFFA3942);
|
|
P(D, A, B, C, 8, 11, 0x8771F681);
|
|
P(C, D, A, B, 11, 16, 0x6D9D6122);
|
|
P(B, C, D, A, 14, 23, 0xFDE5380C);
|
|
P(A, B, C, D, 1, 4, 0xA4BEEA44);
|
|
P(D, A, B, C, 4, 11, 0x4BDECFA9);
|
|
P(C, D, A, B, 7, 16, 0xF6BB4B60);
|
|
P(B, C, D, A, 10, 23, 0xBEBFBC70);
|
|
P(A, B, C, D, 13, 4, 0x289B7EC6);
|
|
P(D, A, B, C, 0, 11, 0xEAA127FA);
|
|
P(C, D, A, B, 3, 16, 0xD4EF3085);
|
|
P(B, C, D, A, 6, 23, 0x04881D05);
|
|
P(A, B, C, D, 9, 4, 0xD9D4D039);
|
|
P(D, A, B, C, 12, 11, 0xE6DB99E5);
|
|
P(C, D, A, B, 15, 16, 0x1FA27CF8);
|
|
P(B, C, D, A, 2, 23, 0xC4AC5665);
|
|
|
|
#undef F
|
|
|
|
#define F(x, y, z) (y ^ (x | ~z))
|
|
|
|
P(A, B, C, D, 0, 6, 0xF4292244);
|
|
P(D, A, B, C, 7, 10, 0x432AFF97);
|
|
P(C, D, A, B, 14, 15, 0xAB9423A7);
|
|
P(B, C, D, A, 5, 21, 0xFC93A039);
|
|
P(A, B, C, D, 12, 6, 0x655B59C3);
|
|
P(D, A, B, C, 3, 10, 0x8F0CCC92);
|
|
P(C, D, A, B, 10, 15, 0xFFEFF47D);
|
|
P(B, C, D, A, 1, 21, 0x85845DD1);
|
|
P(A, B, C, D, 8, 6, 0x6FA87E4F);
|
|
P(D, A, B, C, 15, 10, 0xFE2CE6E0);
|
|
P(C, D, A, B, 6, 15, 0xA3014314);
|
|
P(B, C, D, A, 13, 21, 0x4E0811A1);
|
|
P(A, B, C, D, 4, 6, 0xF7537E82);
|
|
P(D, A, B, C, 11, 10, 0xBD3AF235);
|
|
P(C, D, A, B, 2, 15, 0x2AD7D2BB);
|
|
P(B, C, D, A, 9, 21, 0xEB86D391);
|
|
|
|
#undef F
|
|
|
|
ctx->state[0] += A;
|
|
ctx->state[1] += B;
|
|
ctx->state[2] += C;
|
|
ctx->state[3] += D;
|
|
}
|
|
|
|
void md5_update(md5_context *ctx, const uint8 *input, uint32 length) {
|
|
uint32 left, fill;
|
|
|
|
if (!length)
|
|
return;
|
|
|
|
left = ctx->total[0] & 0x3F;
|
|
fill = 64 - left;
|
|
|
|
ctx->total[0] += length;
|
|
ctx->total[0] &= 0xFFFFFFFF;
|
|
|
|
if (ctx->total[0] < length)
|
|
ctx->total[1]++;
|
|
|
|
if (left && length >= fill) {
|
|
memcpy((void *)(ctx->buffer + left), (const void *)input, fill);
|
|
md5_process(ctx, ctx->buffer);
|
|
length -= fill;
|
|
input += fill;
|
|
left = 0;
|
|
}
|
|
|
|
while (length >= 64) {
|
|
md5_process(ctx, input);
|
|
length -= 64;
|
|
input += 64;
|
|
}
|
|
|
|
if (length) {
|
|
memcpy((void *)(ctx->buffer + left), (const void *)input, length);
|
|
}
|
|
}
|
|
|
|
static const uint8 md5_padding[64] = {
|
|
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
|
|
void md5_finish(md5_context *ctx, uint8 digest[16]) {
|
|
uint32 last, padn;
|
|
uint32 high, low;
|
|
uint8 msglen[8];
|
|
|
|
high = (ctx->total[0] >> 29) | (ctx->total[1] << 3);
|
|
low = (ctx->total[0] << 3);
|
|
|
|
PUT_UINT32(low, msglen, 0);
|
|
PUT_UINT32(high, msglen, 4);
|
|
|
|
last = ctx->total[0] & 0x3F;
|
|
padn = (last < 56) ? (56 - last) : (120 - last);
|
|
|
|
md5_update(ctx, md5_padding, padn);
|
|
md5_update(ctx, msglen, 8);
|
|
|
|
PUT_UINT32(ctx->state[0], digest, 0);
|
|
PUT_UINT32(ctx->state[1], digest, 4);
|
|
PUT_UINT32(ctx->state[2], digest, 8);
|
|
PUT_UINT32(ctx->state[3], digest, 12);
|
|
}
|
|
|
|
|
|
bool computeStreamMD5(ReadStream &stream, uint8 digest[16], uint32 length) {
|
|
|
|
#ifdef DISABLE_MD5
|
|
memset(digest, 0, 16);
|
|
#else
|
|
md5_context ctx;
|
|
int i;
|
|
unsigned char buf[1000];
|
|
bool restricted = (length != 0);
|
|
uint32 readlen;
|
|
|
|
if (!restricted || sizeof(buf) <= length)
|
|
readlen = sizeof(buf);
|
|
else
|
|
readlen = length;
|
|
|
|
md5_starts(&ctx);
|
|
|
|
while ((i = stream.read(buf, readlen)) > 0) {
|
|
md5_update(&ctx, buf, i);
|
|
|
|
if (restricted) {
|
|
length -= i;
|
|
if (length == 0)
|
|
break;
|
|
|
|
if (sizeof(buf) > length)
|
|
readlen = length;
|
|
}
|
|
}
|
|
|
|
md5_finish(&ctx, digest);
|
|
#endif
|
|
return true;
|
|
}
|
|
|
|
String computeStreamMD5AsString(ReadStream &stream, uint32 length) {
|
|
String md5;
|
|
uint8 digest[16];
|
|
if (computeStreamMD5(stream, digest, length)) {
|
|
for (int i = 0; i < 16; i++) {
|
|
md5 += String::format("%02x", (int)digest[i]);
|
|
}
|
|
}
|
|
|
|
return md5;
|
|
}
|
|
|
|
} // End of namespace Common
|