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