#include <netinet/in.h>#ifdef __sun__#include <inttypes.h>#else#include <stdint.h>#endif#include <ctype.h>#include <errno.h>#include <string.h>#include <limits.h>#include "modpost.h" /* * Stolen form Cryptographic API. * * MD4 Message Digest Algorithm (RFC1320). * * Implementation derived from Andrew Tridgell and Steve French's * CIFS MD4 implementation, and the cryptoapi implementation * originally based on the public domain implementation written * by Colin Plumb in 1993. * * Copyright (c) Andrew Tridgell 1997-1998. * Modified by Steve French (sfrench@us.ibm.com) 2002 * Copyright (c) Cryptoapi developers. * Copyright (c) 2002 David S. Miller (davem@redhat.com) * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */#define MD4_DIGEST_SIZE		16#define MD4_HMAC_BLOCK_SIZE	64#define MD4_BLOCK_WORDS		16#define MD4_HASH_WORDS		4 struct md4_ctx {	uint32_t hash[MD4_HASH_WORDS];	uint32_t block[MD4_BLOCK_WORDS];	uint64_t byte_count;}; static inline uint32_t lshift(uint32_t x, unsigned int s){	x &= 0xFFFFFFFF;	return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));} static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z){	return (x & y) | ((~x) & z);} static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z){	return (x & y) | (x & z) | (y & z);} static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z){	return x ^ y ^ z;} #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s)) /* XXX: this stuff can be optimized */static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words){	while (words--) {		*buf = ntohl(*buf);		buf++;	}} static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words){	while (words--) {		*buf = htonl(*buf);		buf++;	}} static void md4_transform(uint32_t *hash, uint32_t const *in){	uint32_t a, b, c, d; 	a = hash[0];	b = hash[1];	c = hash[2];	d = hash[3]; 	ROUND1(a, b, c, d, in[0], 3);	ROUND1(d, a, b, c, in[1], 7);	ROUND1(c, d, a, b, in[2], 11);	ROUND1(b, c, d, a, in[3], 19);	ROUND1(a, b, c, d, in[4], 3);	ROUND1(d, a, b, c, in[5], 7);	ROUND1(c, d, a, b, in[6], 11);	ROUND1(b, c, d, a, in[7], 19);	ROUND1(a, b, c, d, in[8], 3);	ROUND1(d, a, b, c, in[9], 7);	ROUND1(c, d, a, b, in[10], 11);	ROUND1(b, c, d, a, in[11], 19);	ROUND1(a, b, c, d, in[12], 3);	ROUND1(d, a, b, c, in[13], 7);	ROUND1(c, d, a, b, in[14], 11);	ROUND1(b, c, d, a, in[15], 19); 	ROUND2(a, b, c, d,in[ 0], 3);	ROUND2(d, a, b, c, in[4], 5);	ROUND2(c, d, a, b, in[8], 9);	ROUND2(b, c, d, a, in[12], 13);	ROUND2(a, b, c, d, in[1], 3);	ROUND2(d, a, b, c, in[5], 5);	ROUND2(c, d, a, b, in[9], 9);	ROUND2(b, c, d, a, in[13], 13);	ROUND2(a, b, c, d, in[2], 3);	ROUND2(d, a, b, c, in[6], 5);	ROUND2(c, d, a, b, in[10], 9);	ROUND2(b, c, d, a, in[14], 13);	ROUND2(a, b, c, d, in[3], 3);	ROUND2(d, a, b, c, in[7], 5);	ROUND2(c, d, a, b, in[11], 9);	ROUND2(b, c, d, a, in[15], 13); 	ROUND3(a, b, c, d,in[ 0], 3);	ROUND3(d, a, b, c, in[8], 9);	ROUND3(c, d, a, b, in[4], 11);	ROUND3(b, c, d, a, in[12], 15);	ROUND3(a, b, c, d, in[2], 3);	ROUND3(d, a, b, c, in[10], 9);	ROUND3(c, d, a, b, in[6], 11);	ROUND3(b, c, d, a, in[14], 15);	ROUND3(a, b, c, d, in[1], 3);	ROUND3(d, a, b, c, in[9], 9);	ROUND3(c, d, a, b, in[5], 11);	ROUND3(b, c, d, a, in[13], 15);	ROUND3(a, b, c, d, in[3], 3);	ROUND3(d, a, b, c, in[11], 9);	ROUND3(c, d, a, b, in[7], 11);	ROUND3(b, c, d, a, in[15], 15); 	hash[0] += a;	hash[1] += b;	hash[2] += c;	hash[3] += d;} static inline void md4_transform_helper(struct md4_ctx *ctx){	le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));	md4_transform(ctx->hash, ctx->block);} static void md4_init(struct md4_ctx *mctx){	mctx->hash[0] = 0x67452301;	mctx->hash[1] = 0xefcdab89;	mctx->hash[2] = 0x98badcfe;	mctx->hash[3] = 0x10325476;	mctx->byte_count = 0;} static void md4_update(struct md4_ctx *mctx,		       const unsigned char *data, unsigned int len){	const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); 	mctx->byte_count += len; 	if (avail > len) {		memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),		       data, len);		return;	} 	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),	       data, avail); 	md4_transform_helper(mctx);	data += avail;	len -= avail; 	while (len >= sizeof(mctx->block)) {		memcpy(mctx->block, data, sizeof(mctx->block));		md4_transform_helper(mctx);		data += sizeof(mctx->block);		len -= sizeof(mctx->block);	} 	memcpy(mctx->block, data, len);} static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len){	const unsigned int offset = mctx->byte_count & 0x3f;	char *p = (char *)mctx->block + offset;	int padding = 56 - (offset + 1); 	*p++ = 0x80;	if (padding < 0) {		memset(p, 0x00, padding + sizeof (uint64_t));		md4_transform_helper(mctx);		p = (char *)mctx->block;		padding = 56;	} 	memset(p, 0, padding);	mctx->block[14] = mctx->byte_count << 3;	mctx->block[15] = mctx->byte_count >> 29;	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -			  sizeof(uint64_t)) / sizeof(uint32_t));	md4_transform(mctx->hash, mctx->block);	cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t)); 	snprintf(out, len, "%08X%08X%08X%08X",		 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);} static inline void add_char(unsigned char c, struct md4_ctx *md){	md4_update(md, &c, 1);} static int parse_string(const char *file, unsigned long len,			struct md4_ctx *md){	unsigned long i; 	add_char(file[0], md);	for (i = 1; i < len; i++) {		add_char(file[i], md);		if (file[i] == '"' && file[i-1] != '\\')			break;	}	return i;} static int parse_comment(const char *file, unsigned long len){	unsigned long i; 	for (i = 2; i < len; i++) {		if (file[i-1] == '*' && file[i] == '/')			break;	}	return i;} /* FIXME: Handle .s files differently (eg. # starts comments) --RR */static int parse_file(const char *fname, struct md4_ctx *md){	char *file;	unsigned long i, len; 	file = read_text_file(fname);	len = strlen(file); 	for (i = 0; i < len; i++) {		/* Collapse and ignore \ and CR. */		if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {			i++;			continue;		} 		/* Ignore whitespace */		if (isspace(file[i]))			continue; 		/* Handle strings as whole units */		if (file[i] == '"') {			i += parse_string(file+i, len - i, md);			continue;		} 		/* Comments: ignore */		if (file[i] == '/' && file[i+1] == '*') {			i += parse_comment(file+i, len - i);			continue;		} 		add_char(file[i], md);	}	free(file);	return 1;}/* Check whether the file is a static library or not */static int is_static_library(const char *objfile){	int len = strlen(objfile);	if (objfile[len - 2] == '.' && objfile[len - 1] == 'a')		return 1;	else		return 0;} /* We have dir/file.o.  Open dir/.file.o.cmd, look for source_ and deps_ line * to figure out source files. */static int parse_source_files(const char *objfile, struct md4_ctx *md){	char *cmd, *file, *line, *dir, *pos;	const char *base;	int dirlen, ret = 0, check_files = 0; 	cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd"))); 	base = strrchr(objfile, '/');	if (base) {		base++;		dirlen = base - objfile;		sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);	} else {		dirlen = 0;		sprintf(cmd, ".%s.cmd", objfile);	}	dir = NOFAIL(malloc(dirlen + 1));	strncpy(dir, objfile, dirlen);	dir[dirlen] = '\0'; 	file = read_text_file(cmd); 	pos = file; 	/* Sum all files in the same dir or subdirs. */	while ((line = get_line(&pos))) {		char* p = line; 		if (strncmp(line, "source_", sizeof("source_")-1) == 0) {			p = strrchr(line, ' ');			if (!p) {				warn("malformed line: %s\n", line);				goto out_file;			}			p++;			if (!parse_file(p, md)) {				warn("could not open %s: %s\n",				     p, strerror(errno));				goto out_file;			}			continue;		}		if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {			check_files = 1;			continue;		}		if (!check_files)			continue; 		/* Continue until line does not end with '\' */		if ( *(p + strlen(p)-1) != '\\')			break;		/* Terminate line at first space, to get rid of final ' \' */		while (*p) {			if (isspace(*p)) {				*p = '\0';				break;			}			p++;		} 		/* Check if this file is in same dir as objfile */		if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {			if (!parse_file(line, md)) {				warn("could not open %s: %s\n",				     line, strerror(errno));				goto out_file;			} 		} 	} 	/* Everyone parsed OK */	ret = 1;out_file:	free(file);	free(dir);	free(cmd);	return ret;} /* Calc and record src checksum. */void get_src_version(const char *modname, char sum[], unsigned sumlen){	char *buf, *pos, *firstline;	struct md4_ctx md;	char *fname;	char filelist[PATH_MAX + 1]; 	/* objects for a module are listed in the first line of *.mod file. */	snprintf(filelist, sizeof(filelist), "%.*smod",		 (int)strlen(modname) - 1, modname); 	buf = read_text_file(filelist); 	pos = buf;	firstline = get_line(&pos);	if (!firstline) {		warn("bad ending versions file for %s\n", modname);		goto free;	} 	md4_init(&md);	while ((fname = strsep(&firstline, " "))) {		if (!*fname)			continue;		if (!(is_static_library(fname)) &&				!parse_source_files(fname, &md))			goto free;	} 	md4_final_ascii(&md, sum, sumlen);free:	free(buf);}