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128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/*
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* ncpsign_kernel.c
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*
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* Arne de Bruijn (arne@knoware.nl), 1997
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*
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*/
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#ifdef CONFIG_NCPFS_PACKET_SIGNING
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#include <linux/string.h>
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#include <linux/ncp.h>
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#include <linux/bitops.h>
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#include "ncp_fs.h"
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#include "ncpsign_kernel.h"
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/* i386: 32-bit, little endian, handles mis-alignment */
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#ifdef __i386__
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#define GET_LE32(p) (*(const int *)(p))
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#define PUT_LE32(p,v) { *(int *)(p)=v; }
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#else
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/* from include/ncplib.h */
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#define BVAL(buf,pos) (((const __u8 *)(buf))[pos])
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#define PVAL(buf,pos) ((unsigned)BVAL(buf,pos))
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#define BSET(buf,pos,val) (((__u8 *)(buf))[pos] = (val))
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static inline __u16
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WVAL_LH(const __u8 * buf, int pos)
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{
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return PVAL(buf, pos) | PVAL(buf, pos + 1) << 8;
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}
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static inline __u32
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DVAL_LH(const __u8 * buf, int pos)
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{
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return WVAL_LH(buf, pos) | WVAL_LH(buf, pos + 2) << 16;
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}
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static inline void
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WSET_LH(__u8 * buf, int pos, __u16 val)
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{
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BSET(buf, pos, val & 0xff);
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BSET(buf, pos + 1, val >> 8);
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}
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static inline void
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DSET_LH(__u8 * buf, int pos, __u32 val)
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{
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WSET_LH(buf, pos, val & 0xffff);
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WSET_LH(buf, pos + 2, val >> 16);
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}
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#define GET_LE32(p) DVAL_LH(p,0)
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#define PUT_LE32(p,v) DSET_LH(p,0,v)
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#endif
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static void nwsign(char *r_data1, char *r_data2, char *outdata) {
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int i;
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unsigned int w0,w1,w2,w3;
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static int rbit[4]={0, 2, 1, 3};
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#ifdef __i386__
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unsigned int *data2=(unsigned int *)r_data2;
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#else
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unsigned int data2[16];
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for (i=0;i<16;i++)
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data2[i]=GET_LE32(r_data2+(i<<2));
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#endif
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w0=GET_LE32(r_data1);
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w1=GET_LE32(r_data1+4);
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w2=GET_LE32(r_data1+8);
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w3=GET_LE32(r_data1+12);
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for (i=0;i<16;i+=4) {
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w0=rol32(w0 + ((w1 & w2) | ((~w1) & w3)) + data2[i+0],3);
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w3=rol32(w3 + ((w0 & w1) | ((~w0) & w2)) + data2[i+1],7);
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w2=rol32(w2 + ((w3 & w0) | ((~w3) & w1)) + data2[i+2],11);
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w1=rol32(w1 + ((w2 & w3) | ((~w2) & w0)) + data2[i+3],19);
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}
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for (i=0;i<4;i++) {
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w0=rol32(w0 + (((w2 | w3) & w1) | (w2 & w3)) + 0x5a827999 + data2[i+0],3);
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w3=rol32(w3 + (((w1 | w2) & w0) | (w1 & w2)) + 0x5a827999 + data2[i+4],5);
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w2=rol32(w2 + (((w0 | w1) & w3) | (w0 & w1)) + 0x5a827999 + data2[i+8],9);
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w1=rol32(w1 + (((w3 | w0) & w2) | (w3 & w0)) + 0x5a827999 + data2[i+12],13);
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}
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for (i=0;i<4;i++) {
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w0=rol32(w0 + ((w1 ^ w2) ^ w3) + 0x6ed9eba1 + data2[rbit[i]+0],3);
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w3=rol32(w3 + ((w0 ^ w1) ^ w2) + 0x6ed9eba1 + data2[rbit[i]+8],9);
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w2=rol32(w2 + ((w3 ^ w0) ^ w1) + 0x6ed9eba1 + data2[rbit[i]+4],11);
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w1=rol32(w1 + ((w2 ^ w3) ^ w0) + 0x6ed9eba1 + data2[rbit[i]+12],15);
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}
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PUT_LE32(outdata,(w0+GET_LE32(r_data1)) & 0xffffffff);
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PUT_LE32(outdata+4,(w1+GET_LE32(r_data1+4)) & 0xffffffff);
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PUT_LE32(outdata+8,(w2+GET_LE32(r_data1+8)) & 0xffffffff);
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PUT_LE32(outdata+12,(w3+GET_LE32(r_data1+12)) & 0xffffffff);
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}
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/* Make a signature for the current packet and add it at the end of the */
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/* packet. */
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void __sign_packet(struct ncp_server *server, const char *packet, size_t size, __u32 totalsize, void *sign_buff) {
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unsigned char data[64];
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memcpy(data, server->sign_root, 8);
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*(__u32*)(data + 8) = totalsize;
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if (size < 52) {
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memcpy(data + 12, packet, size);
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memset(data + 12 + size, 0, 52 - size);
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} else {
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memcpy(data + 12, packet, 52);
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}
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nwsign(server->sign_last, data, server->sign_last);
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memcpy(sign_buff, server->sign_last, 8);
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}
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int sign_verify_reply(struct ncp_server *server, const char *packet, size_t size, __u32 totalsize, const void *sign_buff) {
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unsigned char data[64];
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unsigned char hash[16];
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memcpy(data, server->sign_root, 8);
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*(__u32*)(data + 8) = totalsize;
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if (size < 52) {
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memcpy(data + 12, packet, size);
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memset(data + 12 + size, 0, 52 - size);
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} else {
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memcpy(data + 12, packet, 52);
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}
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nwsign(server->sign_last, data, hash);
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return memcmp(sign_buff, hash, 8);
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}
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#endif /* CONFIG_NCPFS_PACKET_SIGNING */
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