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128 lines
3.7 KiB
128 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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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