- Updated the address for the FSF in the opening comment.

[rsync/rsync.git] / lib / mdfour.c

diff --git a/lib/mdfour.c b/lib/mdfour.c
index c7bc7ab..d231a3e 100644 (file)
--- a/lib/mdfour.c
+++ b/lib/mdfour.c
@@ -1,30 +1,31 @@
 /* 
-   Unix SMB/Netbios implementation.
-   Version 1.9.
-   a implementation of MD4 designed for use in the SMB authentication protocol
-   Copyright (C) Andrew Tridgell 1997-1998.
-   
-   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., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
+ * Unix SMB/Netbios implementation.
+ * Version 1.9.
+ * An implementation of MD4 designed for use in the SMB authentication protocol.
+ *
+ * Copyright (C) 1997-1998 Andrew Tridgell
+ * Copyright (C) 2005 Wayne Davison
+ * 
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
 
 #include "rsync.h"
 
 /* NOTE: This code makes no attempt to be fast! 
-
-   It assumes that a int is at least 32 bits long
-*/
+ *
+ * It assumes that a int is at least 32 bits long. */
 
 static struct mdfour *m;
 
@@ -109,29 +110,53 @@ void mdfour_begin(struct mdfour *md)
        md->C = 0x98badcfe;
        md->D = 0x10325476;
        md->totalN = 0;
+       md->totalN2 = 0;
 }
 
 
-static void mdfour_tail(unsigned char *in, int n)
+static void mdfour_tail(unsigned char *in, uint32 n)
 {
        unsigned char buf[128];
        uint32 M[16];
-       uint32 b;
-
-       m->totalN += n;
-
-       b = m->totalN * 8;
+       extern int protocol_version;
+
+       /*
+        * Count total number of bits, modulo 2^64
+        */
+       m->totalN += n << 3;
+       if (m->totalN < (n << 3)) {
+               m->totalN2++;
+       }
+       m->totalN2 += n >> 29;
 
        memset(buf, 0, 128);
        if (n) memcpy(buf, in, n);
        buf[n] = 0x80;
 
        if (n <= 55) {
-               copy4(buf+56, b);
+               copy4(buf+56, m->totalN);
+               /*
+                * Prior to protocol version 27 only the number of bits
+                * modulo 2^32 was included.  MD4 requires the number
+                * of bits modulo 2^64, which was fixed starting with
+                * protocol version 27.
+                */
+               if (protocol_version >= 27) {
+                       copy4(buf+60, m->totalN2);
+               }
                copy64(M, buf);
                mdfour64(M);
        } else {
-               copy4(buf+120, b); 
+               copy4(buf+120, m->totalN); 
+               /*
+                * Prior to protocol version 27 only the number of bits
+                * modulo 2^32 was included.  MD4 requires the number
+                * of bits modulo 2^64, which was fixed starting with
+                * protocol version 27.
+                */
+               if (protocol_version >= 27) {
+                       copy4(buf+124, m->totalN2); 
+               }
                copy64(M, buf);
                mdfour64(M);
                copy64(M, buf+64);
@@ -139,20 +164,23 @@ static void mdfour_tail(unsigned char *in, int n)
        }
 }
 
-void mdfour_update(struct mdfour *md, unsigned char *in, int n)
+void mdfour_update(struct mdfour *md, unsigned char *in, uint32 n)
 {
        uint32 M[16];
 
-       if (n == 0) mdfour_tail(in, n);
-
        m = md;
 
+       if (n == 0) mdfour_tail(in, n);
+
        while (n >= 64) {
                copy64(M, in);
                mdfour64(M);
                in += 64;
                n -= 64;
-               m->totalN += 64;
+               m->totalN += 64 << 3;
+               if (m->totalN < 64 << 3) {
+                       m->totalN2++;
+               }
        }
 
        if (n) mdfour_tail(in, n);
@@ -179,9 +207,11 @@ void mdfour(unsigned char *out, unsigned char *in, int n)
 }
 
 #ifdef TEST_MDFOUR
+int protocol_version = 28;
+
 static void file_checksum1(char *fname)
 {
-       int fd, i;
+       int fd, i, was_multiple_of_64 = 1;
        struct mdfour md;
        unsigned char buf[64*1024], sum[16];
        
@@ -195,9 +225,13 @@ static void file_checksum1(char *fname)
 
        while (1) {
                int n = read(fd, buf, sizeof(buf));
-               if (n <= 0) break;
+               if (n <= 0)
+                       break;
+               was_multiple_of_64 = !(n % 64);
                mdfour_update(&md, buf, n);
        }
+       if (was_multiple_of_64 && protocol_version >= 27)
+               mdfour_update(&md, buf, 0);
 
        close(fd);