1/* 2 * ncpsign_kernel.c 3 * 4 * Arne de Bruijn (arne@knoware.nl), 1997 5 * 6 */ 7 8 9#ifdef CONFIG_NCPFS_PACKET_SIGNING 10 11#include <linux/string.h> 12#include <linux/ncp.h> 13#include <linux/bitops.h> 14#include "ncpsign_kernel.h" 15 16/* i386: 32-bit, little endian, handles mis-alignment */ 17#ifdef __i386__ 18#define GET_LE32(p) (*(int *)(p)) 19#define PUT_LE32(p,v) { *(int *)(p)=v; } 20#else 21/* from include/ncplib.h */ 22#define BVAL(buf,pos) (((__u8 *)(buf))[pos]) 23#define PVAL(buf,pos) ((unsigned)BVAL(buf,pos)) 24#define BSET(buf,pos,val) (BVAL(buf,pos) = (val)) 25 26static inline __u16 27WVAL_LH(__u8 * buf, int pos) 28{ 29 return PVAL(buf, pos) | PVAL(buf, pos + 1) << 8; 30} 31static inline __u32 32DVAL_LH(__u8 * buf, int pos) 33{ 34 return WVAL_LH(buf, pos) | WVAL_LH(buf, pos + 2) << 16; 35} 36static inline void 37WSET_LH(__u8 * buf, int pos, __u16 val) 38{ 39 BSET(buf, pos, val & 0xff); 40 BSET(buf, pos + 1, val >> 8); 41} 42static inline void 43DSET_LH(__u8 * buf, int pos, __u32 val) 44{ 45 WSET_LH(buf, pos, val & 0xffff); 46 WSET_LH(buf, pos + 2, val >> 16); 47} 48 49#define GET_LE32(p) DVAL_LH(p,0) 50#define PUT_LE32(p,v) DSET_LH(p,0,v) 51#endif 52 53static void nwsign(char *r_data1, char *r_data2, char *outdata) { 54 int i; 55 unsigned int w0,w1,w2,w3; 56 static int rbit[4]={0, 2, 1, 3}; 57#ifdef __i386__ 58 unsigned int *data2=(int *)r_data2; 59#else 60 unsigned int data2[16]; 61 for (i=0;i<16;i++) 62 data2[i]=GET_LE32(r_data2+(i<<2)); 63#endif 64 w0=GET_LE32(r_data1); 65 w1=GET_LE32(r_data1+4); 66 w2=GET_LE32(r_data1+8); 67 w3=GET_LE32(r_data1+12); 68 for (i=0;i<16;i+=4) { 69 w0=rol32(w0 + ((w1 & w2) | ((~w1) & w3)) + data2[i+0],3); 70 w3=rol32(w3 + ((w0 & w1) | ((~w0) & w2)) + data2[i+1],7); 71 w2=rol32(w2 + ((w3 & w0) | ((~w3) & w1)) + data2[i+2],11); 72 w1=rol32(w1 + ((w2 & w3) | ((~w2) & w0)) + data2[i+3],19); 73 } 74 for (i=0;i<4;i++) { 75 w0=rol32(w0 + (((w2 | w3) & w1) | (w2 & w3)) + 0x5a827999 + data2[i+0],3); 76 w3=rol32(w3 + (((w1 | w2) & w0) | (w1 & w2)) + 0x5a827999 + data2[i+4],5); 77 w2=rol32(w2 + (((w0 | w1) & w3) | (w0 & w1)) + 0x5a827999 + data2[i+8],9); 78 w1=rol32(w1 + (((w3 | w0) & w2) | (w3 & w0)) + 0x5a827999 + data2[i+12],13); 79 } 80 for (i=0;i<4;i++) { 81 w0=rol32(w0 + ((w1 ^ w2) ^ w3) + 0x6ed9eba1 + data2[rbit[i]+0],3); 82 w3=rol32(w3 + ((w0 ^ w1) ^ w2) + 0x6ed9eba1 + data2[rbit[i]+8],9); 83 w2=rol32(w2 + ((w3 ^ w0) ^ w1) + 0x6ed9eba1 + data2[rbit[i]+4],11); 84 w1=rol32(w1 + ((w2 ^ w3) ^ w0) + 0x6ed9eba1 + data2[rbit[i]+12],15); 85 } 86 PUT_LE32(outdata,(w0+GET_LE32(r_data1)) & 0xffffffff); 87 PUT_LE32(outdata+4,(w1+GET_LE32(r_data1+4)) & 0xffffffff); 88 PUT_LE32(outdata+8,(w2+GET_LE32(r_data1+8)) & 0xffffffff); 89 PUT_LE32(outdata+12,(w3+GET_LE32(r_data1+12)) & 0xffffffff); 90} 91 92/* Make a signature for the current packet and add it at the end of the */ 93/* packet. */ 94void __sign_packet(struct ncp_server *server, const char *packet, size_t size, __u32 totalsize, void *sign_buff) { 95 unsigned char data[64]; 96 97 memcpy(data, server->sign_root, 8); 98 *(__u32*)(data + 8) = totalsize; 99 if (size < 52) { 100 memcpy(data + 12, packet, size); 101 memset(data + 12 + size, 0, 52 - size); 102 } else { 103 memcpy(data + 12, packet, 52); 104 } 105 nwsign(server->sign_last, data, server->sign_last); 106 memcpy(sign_buff, server->sign_last, 8); 107} 108 109int sign_verify_reply(struct ncp_server *server, const char *packet, size_t size, __u32 totalsize, const void *sign_buff) { 110 unsigned char data[64]; 111 unsigned char hash[16]; 112 113 memcpy(data, server->sign_root, 8); 114 *(__u32*)(data + 8) = totalsize; 115 if (size < 52) { 116 memcpy(data + 12, packet, size); 117 memset(data + 12 + size, 0, 52 - size); 118 } else { 119 memcpy(data + 12, packet, 52); 120 } 121 nwsign(server->sign_last, data, hash); 122 return memcmp(sign_buff, hash, 8); 123} 124 125#endif /* CONFIG_NCPFS_PACKET_SIGNING */ 126