/* *  ncpsign_kernel.c * *  Arne de Bruijn (arne@knoware.nl), 1997 * */  #ifdef CONFIG_NCPFS_PACKET_SIGNING #include <linux/string.h>#include <linux/ncp.h>#include <linux/bitops.h>#include "ncp_fs.h"#include "ncpsign_kernel.h" /* i386: 32-bit, little endian, handles mis-alignment */#ifdef __i386__#define GET_LE32(p) (*(const int *)(p))#define PUT_LE32(p,v) { *(int *)(p)=v; }#else/* from include/ncplib.h */#define BVAL(buf,pos) (((const __u8 *)(buf))[pos])#define PVAL(buf,pos) ((unsigned)BVAL(buf,pos))#define BSET(buf,pos,val) (((__u8 *)(buf))[pos] = (val)) static inline __u16WVAL_LH(const __u8 * buf, int pos){	return PVAL(buf, pos) | PVAL(buf, pos + 1) << 8;}static inline __u32DVAL_LH(const __u8 * buf, int pos){	return WVAL_LH(buf, pos) | WVAL_LH(buf, pos + 2) << 16;}static inline voidWSET_LH(__u8 * buf, int pos, __u16 val){	BSET(buf, pos, val & 0xff);	BSET(buf, pos + 1, val >> 8);}static inline voidDSET_LH(__u8 * buf, int pos, __u32 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 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=(unsigned 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, const char *packet, size_t size, __u32 totalsize, void *sign_buff) {	unsigned char data[64]; 	memcpy(data, server->sign_root, 8);	*(__u32*)(data + 8) = totalsize;	if (size < 52) {		memcpy(data + 12, packet, size);		memset(data + 12 + size, 0, 52 - size);	} else {		memcpy(data + 12, packet, 52);	}	nwsign(server->sign_last, data, server->sign_last);	memcpy(sign_buff, server->sign_last, 8);} int sign_verify_reply(struct ncp_server *server, const char *packet, size_t size, __u32 totalsize, const void *sign_buff) {	unsigned char data[64];	unsigned char hash[16]; 	memcpy(data, server->sign_root, 8);	*(__u32*)(data + 8) = totalsize;	if (size < 52) {		memcpy(data + 12, packet, size);		memset(data + 12 + size, 0, 52 - size);	} else {		memcpy(data + 12, packet, 52);	}	nwsign(server->sign_last, data, hash);	return memcmp(sign_buff, hash, 8);} #endif	/* CONFIG_NCPFS_PACKET_SIGNING */