The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ncpfs/ncpsign_kernel.c

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    1 /*
    2  *  ncpsign_kernel.c
    3  *
    4  *  Arne de Bruijn (arne@knoware.nl), 1997
    5  *
    6  */
    7 
    8 #include <linux/config.h>
    9 
   10 #ifdef CONFIG_NCPFS_PACKET_SIGNING
   11 
   12 #include <linux/string.h>
   13 #include <linux/ncp.h>
   14 #include "ncpsign_kernel.h"
   15 
   16 #define rol32(i,c) (((((i)&0xffffffff)<<c)&0xffffffff)| \
   17                     (((i)&0xffffffff)>>(32-c)))
   18 /* i386: 32-bit, little endian, handles mis-alignment */
   19 #ifdef __i386__
   20 #define GET_LE32(p) (*(int *)(p))
   21 #define PUT_LE32(p,v) { *(int *)(p)=v; }
   22 #else
   23 /* from include/ncplib.h */
   24 #define BVAL(buf,pos) (((__u8 *)(buf))[pos])
   25 #define PVAL(buf,pos) ((unsigned)BVAL(buf,pos))
   26 #define BSET(buf,pos,val) (BVAL(buf,pos) = (val))
   27 
   28 static inline __u16
   29 WVAL_LH(__u8 * buf, int pos)
   30 {
   31         return PVAL(buf, pos) | PVAL(buf, pos + 1) << 8;
   32 }
   33 static inline __u32
   34 DVAL_LH(__u8 * buf, int pos)
   35 {
   36         return WVAL_LH(buf, pos) | WVAL_LH(buf, pos + 2) << 16;
   37 }
   38 static inline void
   39 WSET_LH(__u8 * buf, int pos, __u16 val)
   40 {
   41         BSET(buf, pos, val & 0xff);
   42         BSET(buf, pos + 1, val >> 8);
   43 }
   44 static inline void
   45 DSET_LH(__u8 * buf, int pos, __u32 val)
   46 {
   47         WSET_LH(buf, pos, val & 0xffff);
   48         WSET_LH(buf, pos + 2, val >> 16);
   49 }
   50 
   51 #define GET_LE32(p) DVAL_LH(p,0)
   52 #define PUT_LE32(p,v) DSET_LH(p,0,v)
   53 #endif
   54 
   55 static void nwsign(char *r_data1, char *r_data2, char *outdata) {
   56  int i;
   57  unsigned int w0,w1,w2,w3;
   58  static int rbit[4]={0, 2, 1, 3};
   59 #ifdef __i386__
   60  unsigned int *data2=(int *)r_data2;
   61 #else
   62  unsigned int data2[16];
   63  for (i=0;i<16;i++)
   64   data2[i]=GET_LE32(r_data2+(i<<2));
   65 #endif 
   66  w0=GET_LE32(r_data1);
   67  w1=GET_LE32(r_data1+4);
   68  w2=GET_LE32(r_data1+8);
   69  w3=GET_LE32(r_data1+12);
   70  for (i=0;i<16;i+=4) {
   71   w0=rol32(w0 + ((w1 & w2) | ((~w1) & w3)) + data2[i+0],3);
   72   w3=rol32(w3 + ((w0 & w1) | ((~w0) & w2)) + data2[i+1],7);
   73   w2=rol32(w2 + ((w3 & w0) | ((~w3) & w1)) + data2[i+2],11);
   74   w1=rol32(w1 + ((w2 & w3) | ((~w2) & w0)) + data2[i+3],19);
   75  }
   76  for (i=0;i<4;i++) {
   77   w0=rol32(w0 + (((w2 | w3) & w1) | (w2 & w3)) + 0x5a827999 + data2[i+0],3);
   78   w3=rol32(w3 + (((w1 | w2) & w0) | (w1 & w2)) + 0x5a827999 + data2[i+4],5);
   79   w2=rol32(w2 + (((w0 | w1) & w3) | (w0 & w1)) + 0x5a827999 + data2[i+8],9);
   80   w1=rol32(w1 + (((w3 | w0) & w2) | (w3 & w0)) + 0x5a827999 + data2[i+12],13);
   81  }
   82  for (i=0;i<4;i++) {
   83   w0=rol32(w0 + ((w1 ^ w2) ^ w3) + 0x6ed9eba1 + data2[rbit[i]+0],3);
   84   w3=rol32(w3 + ((w0 ^ w1) ^ w2) + 0x6ed9eba1 + data2[rbit[i]+8],9);
   85   w2=rol32(w2 + ((w3 ^ w0) ^ w1) + 0x6ed9eba1 + data2[rbit[i]+4],11);
   86   w1=rol32(w1 + ((w2 ^ w3) ^ w0) + 0x6ed9eba1 + data2[rbit[i]+12],15);
   87  }
   88  PUT_LE32(outdata,(w0+GET_LE32(r_data1)) & 0xffffffff);
   89  PUT_LE32(outdata+4,(w1+GET_LE32(r_data1+4)) & 0xffffffff);
   90  PUT_LE32(outdata+8,(w2+GET_LE32(r_data1+8)) & 0xffffffff);
   91  PUT_LE32(outdata+12,(w3+GET_LE32(r_data1+12)) & 0xffffffff);
   92 }
   93 
   94 /* Make a signature for the current packet and add it at the end of the */
   95 /* packet. */
   96 void sign_packet(struct ncp_server *server, int *size) {
   97  char data[64];
   98 
   99  memset(data,0,64);
  100  memcpy(data,server->sign_root,8);
  101  PUT_LE32(data+8,(*size));
  102  memcpy(data+12,server->packet+sizeof(struct ncp_request_header)-1,
  103   min_t(unsigned int,(*size)-sizeof(struct ncp_request_header)+1,52));
  104 
  105  nwsign(server->sign_last,data,server->sign_last);
  106 
  107  memcpy(server->packet+(*size),server->sign_last,8);
  108  (*size)+=8;
  109 }
  110 
  111 #endif  /* CONFIG_NCPFS_PACKET_SIGNING */
  112 

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