patch-2.0.37 linux/fs/ncpfs/ncpsign_kernel.c

• Lines: 126
• Date: Sun Jun 13 10:21:03 1999
• Orig file: v2.0.36/linux/fs/ncpfs/ncpsign_kernel.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.36/linux/fs/ncpfs/ncpsign_kernel.c linux/fs/ncpfs/ncpsign_kernel.c
@@ -0,0 +1,125 @@
+/*
+ *  ncpsign_kernel.c
+ *
+ *  Arne de Bruijn (arne@knoware.nl), 1997
+ *
+ */
+
+#include <linux/config.h>
+
+#ifdef CONFIG_NCPFS_PACKET_SIGNING
+
+#if 0
+#ifdef MODULE
+#include <linux/module.h>
+#include <linux/version.h>
+#endif
+#endif
+
+#include <linux/string.h>
+#include <linux/ncp.h>
+#if 0
+#include <linux/ncp_fs.h>
+#include <linux/ncp_fs_sb.h>
+#endif
+#include "ncpsign_kernel.h"
+
+#define rol32(i,c) (((((i)&0xffffffff)<<c)&0xffffffff)| \
+                    (((i)&0xffffffff)>>(32-c)))
+/* i386: 32-bit, little endian, handles mis-alignment */
+#ifdef __i386__
+#define GET_LE32(p) (*(int *)(p))
+#define PUT_LE32(p,v) { *(int *)(p)=v; }
+#else
+/* from include/ncplib.h */
+#define BVAL(buf,pos) (((__u8 *)(buf))[pos])
+#define PVAL(buf,pos) ((unsigned)BVAL(buf,pos))
+#define BSET(buf,pos,val) (BVAL(buf,pos) = (val))
+
+static inline word
+WVAL_LH(__u8 * buf, int pos)
+{
+	return PVAL(buf, pos) | PVAL(buf, pos + 1) << 8;
+}
+static inline dword
+DVAL_LH(__u8 * buf, int pos)
+{
+	return WVAL_LH(buf, pos) | WVAL_LH(buf, pos + 2) << 16;
+}
+static inline void
+WSET_LH(__u8 * buf, int pos, word val)
+{
+	BSET(buf, pos, val & 0xff);
+	BSET(buf, pos + 1, val >> 8);
+}
+static inline void
+DSET_LH(__u8 * buf, int pos, dword val)
+{
+	WSET_LH(buf, pos, val & 0xffff);
+	WSET_LH(buf, pos + 2, val >> 16);
+}
+
+#define GET_LE32(p) DVAL_LH(p,0)
+#define PUT_LE32(p,v) DSET_LH(p,0,v)
+#endif
+
+#define min(a,b) ((a)<(b)?(a):(b))
+
+static void nwsign(char *r_data1, char *r_data2, char *outdata) {
+ int i;
+ unsigned int w0,w1,w2,w3;
+ static int rbit[4]={0, 2, 1, 3};
+#ifdef __i386__
+ unsigned int *data2=(int *)r_data2;
+#else
+ unsigned int data2[16];
+ for (i=0;i<16;i++)
+  data2[i]=GET_LE32(r_data2+(i<<2));
+#endif 
+ w0=GET_LE32(r_data1);
+ w1=GET_LE32(r_data1+4);
+ w2=GET_LE32(r_data1+8);
+ w3=GET_LE32(r_data1+12);
+ for (i=0;i<16;i+=4) {
+  w0=rol32(w0 + ((w1 & w2) | ((~w1) & w3)) + data2[i+0],3);
+  w3=rol32(w3 + ((w0 & w1) | ((~w0) & w2)) + data2[i+1],7);
+  w2=rol32(w2 + ((w3 & w0) | ((~w3) & w1)) + data2[i+2],11);
+  w1=rol32(w1 + ((w2 & w3) | ((~w2) & w0)) + data2[i+3],19);
+ }
+ for (i=0;i<4;i++) {
+  w0=rol32(w0 + (((w2 | w3) & w1) | (w2 & w3)) + 0x5a827999 + data2[i+0],3);
+  w3=rol32(w3 + (((w1 | w2) & w0) | (w1 & w2)) + 0x5a827999 + data2[i+4],5);
+  w2=rol32(w2 + (((w0 | w1) & w3) | (w0 & w1)) + 0x5a827999 + data2[i+8],9);
+  w1=rol32(w1 + (((w3 | w0) & w2) | (w3 & w0)) + 0x5a827999 + data2[i+12],13);
+ }
+ for (i=0;i<4;i++) {
+  w0=rol32(w0 + ((w1 ^ w2) ^ w3) + 0x6ed9eba1 + data2[rbit[i]+0],3);
+  w3=rol32(w3 + ((w0 ^ w1) ^ w2) + 0x6ed9eba1 + data2[rbit[i]+8],9);
+  w2=rol32(w2 + ((w3 ^ w0) ^ w1) + 0x6ed9eba1 + data2[rbit[i]+4],11);
+  w1=rol32(w1 + ((w2 ^ w3) ^ w0) + 0x6ed9eba1 + data2[rbit[i]+12],15);
+ }
+ PUT_LE32(outdata,(w0+GET_LE32(r_data1)) & 0xffffffff);
+ PUT_LE32(outdata+4,(w1+GET_LE32(r_data1+4)) & 0xffffffff);
+ PUT_LE32(outdata+8,(w2+GET_LE32(r_data1+8)) & 0xffffffff);
+ PUT_LE32(outdata+12,(w3+GET_LE32(r_data1+12)) & 0xffffffff);
+}
+
+/* Make a signature for the current packet and add it at the end of the */
+/* packet. */
+void sign_packet(struct ncp_server *server, int *size) {
+ char data[64];
+
+ memset(data,0,64);
+ memcpy(data,server->sign_root,8);
+ PUT_LE32(data+8,(*size));
+ memcpy(data+12,server->packet+sizeof(struct ncp_request_header)-1,
+  min((*size)-sizeof(struct ncp_request_header)+1,52));
+
+ nwsign(server->sign_last,data,server->sign_last);
+
+ memcpy(server->packet+(*size),server->sign_last,8);
+ (*size)+=8;
+}
+
+#endif	/* CONFIG_NCPFS_PACKET_SIGNING */
+