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/*

 *  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 */