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-rw-r--r--code/qcommon/md4.c375
1 files changed, 182 insertions, 193 deletions
diff --git a/code/qcommon/md4.c b/code/qcommon/md4.c
index 9b04401..1b491be 100644
--- a/code/qcommon/md4.c
+++ b/code/qcommon/md4.c
@@ -1,238 +1,227 @@
-/*
- * Cryptographic API.
- *
- * MD4 Message Digest Algorithm (RFC1320).
- *
- * Implementation derived from Andrew Tridgell and Steve French's
- * CIFS MD4 implementation, and the cryptoapi implementation
- * originally based on the public domain implementation written
- * by Colin Plumb in 1993.
- *
- * Copyright (c) Andrew Tridgell 1997-1998.
- * Modified by Steve French (sfrench@us.ibm.com) 2002
- * Copyright (c) Cryptoapi developers.
- * Copyright (c) 2002 David S. Miller (davem@redhat.com)
- * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
- *
- * 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.
- *
- */
+/*
+ mdfour.c
+
+ An implementation of MD4 designed for use in the samba SMB
+ authentication protocol
+
+ Copyright (C) 1997-1998 Andrew Tridgell
+
+ 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:
+
+ Free Software Foundation, Inc.
+ 59 Temple Place - Suite 330
+ Boston, MA 02111-1307, USA
+
+ $Id: mdfour.c,v 1.1 2002/08/23 22:03:27 abster Exp $
+*/
#include "q_shared.h"
#include "qcommon.h"
-typedef unsigned int u32;
-#define MD4_DIGEST_SIZE 16
-#define MD4_HMAC_BLOCK_SIZE 64
-#define MD4_BLOCK_WORDS 16
-#define MD4_HASH_WORDS 4
+#ifndef int32
+#define int32 int
+#endif
+
+#if SIZEOF_INT > 4
+#define LARGE_INT32
+#endif
+
+#ifndef uint32
+#define uint32 unsigned int32
+#endif
-struct md4_ctx {
- u32 hash[MD4_HASH_WORDS];
- u32 block[MD4_BLOCK_WORDS];
- u32 byte_count;
+struct mdfour {
+ uint32 A, B, C, D;
+ uint32 totalN;
};
-static ID_INLINE u32 lshift(u32 x, unsigned int s)
-{
- x &= 0xFFFFFFFF;
- return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
-}
-static ID_INLINE u32 F(u32 x, u32 y, u32 z)
-{
- return (x & y) | ((~x) & z);
-}
+/* NOTE: This code makes no attempt to be fast!
-static ID_INLINE u32 G(u32 x, u32 y, u32 z)
-{
- return (x & y) | (x & z) | (y & z);
-}
+ It assumes that a int is at least 32 bits long
+*/
+
+static struct mdfour *m;
+
+#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))
+#ifdef LARGE_INT32
+#define lshift(x,s) ((((x)<<(s))&0xFFFFFFFF) | (((x)>>(32-(s)))&0xFFFFFFFF))
+#else
+#define lshift(x,s) (((x)<<(s)) | ((x)>>(32-(s))))
+#endif
+
+#define ROUND1(a,b,c,d,k,s) a = lshift(a + F(b,c,d) + X[k], s)
+#define ROUND2(a,b,c,d,k,s) a = lshift(a + G(b,c,d) + X[k] + 0x5A827999,s)
+#define ROUND3(a,b,c,d,k,s) a = lshift(a + H(b,c,d) + X[k] + 0x6ED9EBA1,s)
-static ID_INLINE u32 H(u32 x, u32 y, u32 z)
+/* this applies md4 to 64 byte chunks */
+static void mdfour64(uint32 *M)
{
- return x ^ y ^ z;
+ int j;
+ uint32 AA, BB, CC, DD;
+ uint32 X[16];
+ uint32 A,B,C,D;
+
+ for (j=0;j<16;j++)
+ X[j] = M[j];
+
+ 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;
+
+#ifdef LARGE_INT32
+ A &= 0xFFFFFFFF; B &= 0xFFFFFFFF;
+ C &= 0xFFFFFFFF; D &= 0xFFFFFFFF;
+#endif
+
+ for (j=0;j<16;j++)
+ X[j] = 0;
+
+ m->A = A; m->B = B; m->C = C; m->D = D;
}
-
-#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
-#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s))
-#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))
-static ID_INLINE void LittleLongArray(u32 *buf, unsigned int words)
+static void copy64(uint32 *M, byte *in)
{
- while (words--) {
- *buf = LittleLong(*buf);
- buf++;
- }
+ int i;
+
+ for (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);
}
-static void md4_transform(u32 *hash, u32 const *in)
+static void copy4(byte *out,uint32 x)
{
- u32 a, b, c, d;
-
- a = hash[0];
- b = hash[1];
- c = hash[2];
- d = hash[3];
-
- ROUND1(a, b, c, d, in[0], 3);
- ROUND1(d, a, b, c, in[1], 7);
- ROUND1(c, d, a, b, in[2], 11);
- ROUND1(b, c, d, a, in[3], 19);
- ROUND1(a, b, c, d, in[4], 3);
- ROUND1(d, a, b, c, in[5], 7);
- ROUND1(c, d, a, b, in[6], 11);
- ROUND1(b, c, d, a, in[7], 19);
- ROUND1(a, b, c, d, in[8], 3);
- ROUND1(d, a, b, c, in[9], 7);
- ROUND1(c, d, a, b, in[10], 11);
- ROUND1(b, c, d, a, in[11], 19);
- ROUND1(a, b, c, d, in[12], 3);
- ROUND1(d, a, b, c, in[13], 7);
- ROUND1(c, d, a, b, in[14], 11);
- ROUND1(b, c, d, a, in[15], 19);
-
- ROUND2(a, b, c, d,in[ 0], 3);
- ROUND2(d, a, b, c, in[4], 5);
- ROUND2(c, d, a, b, in[8], 9);
- ROUND2(b, c, d, a, in[12], 13);
- ROUND2(a, b, c, d, in[1], 3);
- ROUND2(d, a, b, c, in[5], 5);
- ROUND2(c, d, a, b, in[9], 9);
- ROUND2(b, c, d, a, in[13], 13);
- ROUND2(a, b, c, d, in[2], 3);
- ROUND2(d, a, b, c, in[6], 5);
- ROUND2(c, d, a, b, in[10], 9);
- ROUND2(b, c, d, a, in[14], 13);
- ROUND2(a, b, c, d, in[3], 3);
- ROUND2(d, a, b, c, in[7], 5);
- ROUND2(c, d, a, b, in[11], 9);
- ROUND2(b, c, d, a, in[15], 13);
-
- ROUND3(a, b, c, d,in[ 0], 3);
- ROUND3(d, a, b, c, in[8], 9);
- ROUND3(c, d, a, b, in[4], 11);
- ROUND3(b, c, d, a, in[12], 15);
- ROUND3(a, b, c, d, in[2], 3);
- ROUND3(d, a, b, c, in[10], 9);
- ROUND3(c, d, a, b, in[6], 11);
- ROUND3(b, c, d, a, in[14], 15);
- ROUND3(a, b, c, d, in[1], 3);
- ROUND3(d, a, b, c, in[9], 9);
- ROUND3(c, d, a, b, in[5], 11);
- ROUND3(b, c, d, a, in[13], 15);
- ROUND3(a, b, c, d, in[3], 3);
- ROUND3(d, a, b, c, in[11], 9);
- ROUND3(c, d, a, b, in[7], 11);
- ROUND3(b, c, d, a, in[15], 15);
-
- hash[0] += a;
- hash[1] += b;
- hash[2] += c;
- hash[3] += d;
+ out[0] = x&0xFF;
+ out[1] = (x>>8)&0xFF;
+ out[2] = (x>>16)&0xFF;
+ out[3] = (x>>24)&0xFF;
}
-static ID_INLINE void md4_transform_helper(struct md4_ctx *ctx)
+void mdfour_begin(struct mdfour *md)
{
- LittleLongArray(ctx->block, sizeof(ctx->block) / 4);
- md4_transform(ctx->hash, ctx->block);
+ md->A = 0x67452301;
+ md->B = 0xefcdab89;
+ md->C = 0x98badcfe;
+ md->D = 0x10325476;
+ md->totalN = 0;
}
-static void md4_init(void *ctx)
-{
- struct md4_ctx *mctx = ctx;
- mctx->hash[0] = 0x67452301;
- mctx->hash[1] = 0xefcdab89;
- mctx->hash[2] = 0x98badcfe;
- mctx->hash[3] = 0x10325476;
- mctx->byte_count = 0;
+static void mdfour_tail(byte *in, int n)
+{
+ byte buf[128];
+ uint32 M[16];
+ uint32 b;
+
+ m->totalN += n;
+
+ b = m->totalN * 8;
+
+ Com_Memset(buf, 0, 128);
+ if (n) Com_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);
+ }
}
-static void md4_update(void *ctx, const byte *data, unsigned int len)
+static void mdfour_update(struct mdfour *md, byte *in, int n)
{
- struct md4_ctx *mctx = ctx;
- const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
+ uint32 M[16];
- mctx->byte_count += len;
+ if (n == 0) mdfour_tail(in, n);
- if (avail > len) {
- Com_Memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
- data, len);
- return;
+ m = md;
+
+ while (n >= 64) {
+ copy64(M, in);
+ mdfour64(M);
+ in += 64;
+ n -= 64;
+ m->totalN += 64;
}
- Com_Memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
- data, avail);
+ mdfour_tail(in, n);
+}
- md4_transform_helper(mctx);
- data += avail;
- len -= avail;
- while (len >= sizeof(mctx->block)) {
- Com_Memcpy(mctx->block, data, sizeof(mctx->block));
- md4_transform_helper(mctx);
- data += sizeof(mctx->block);
- len -= sizeof(mctx->block);
- }
+static void mdfour_result(struct mdfour *md, byte *out)
+{
+ m = md;
- Com_Memcpy(mctx->block, data, len);
+ copy4(out, m->A);
+ copy4(out+4, m->B);
+ copy4(out+8, m->C);
+ copy4(out+12, m->D);
}
-static void md4_final(void *ctx, byte *out)
+static void mdfour(byte *out, byte *in, int n)
{
- struct md4_ctx *mctx = ctx;
- const unsigned int offset = mctx->byte_count & 0x3f;
- char *p = (char *)mctx->block + offset;
- int padding = 56 - (offset + 1);
-
- *p++ = 0x80;
- if (padding < 0) {
- Com_Memset(p, 0x00, padding + 8);
- md4_transform_helper(mctx);
- p = (char *)mctx->block;
- padding = 56;
- }
-
- Com_Memset(p, 0, padding);
- mctx->block[14] = mctx->byte_count << 3;
- mctx->block[15] = mctx->byte_count >> 29;
- LittleLongArray(mctx->block, (sizeof(mctx->block) - 8) / 4);
- md4_transform(mctx->hash, mctx->block);
- Com_Memcpy(out, mctx->hash, sizeof(mctx->hash));
- Com_Memset(mctx, 0, sizeof(*mctx));
+ struct mdfour md;
+ mdfour_begin(&md);
+ mdfour_update(&md, in, n);
+ mdfour_result(&md, out);
}
//===================================================================
-unsigned Com_BlockChecksum( const void *buffer, int length )
+unsigned Com_BlockChecksum (const void *buffer, int length)
{
- int digest[4];
- unsigned val;
- struct md4_ctx ctx;
-
- md4_init( &ctx );
- md4_update( &ctx, (byte *)buffer, length );
- md4_final( &ctx, (byte *)digest );
-
- val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
+ int digest[4];
+ unsigned val;
- return val;
-}
-
-unsigned Com_BlockChecksumKey( const void *buffer, int length, int key )
-{
- int digest[4];
- unsigned val;
- struct md4_ctx ctx;
-
- md4_init( &ctx );
- md4_update( &ctx, (byte *)&key, 4 );
- md4_update( &ctx, (byte *)buffer, length );
- md4_final( &ctx, (byte *)digest );
+ mdfour( (byte *)digest, (byte *)buffer, length );
val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
generated by cgit v1.2.3 (git 2.39.1) at 2025-11-04 03:38:32 +0000