/* * 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 "ncpsign_kernel.h" /* 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 __u16 WVAL_LH(__u8 * buf, int pos) { return PVAL(buf, pos) | PVAL(buf, pos + 1) << 8; } static inline __u32 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, __u16 val) { BSET(buf, pos, val & 0xff); BSET(buf, pos + 1, val >> 8); } static inline void DSET_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 */