首页 › UC › 用MD5算法校验文件（linux c）

用MD5算法校验文件（linux c）

第七根弦 2014 年 8 月 23 日 UC 发表评论 (0)

最近改造了一个用MD5算法校验文件的方法，在linux c 下可用

C++
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
// MD5C.cpp : Defines the entry point for the console application.
//
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
#define RL(x, y) (((x) << (y)) | ((x) >> (32 - (y))))
#define PP(x) (x<<24)|((x<<8)&0xff0000)|((x>>8)&0xff00)|(x>>24)
#define FF(a, b, c, d, x, s, ac) a = b + (RL((a + F(b,c,d) + x + ac),s))
#define GG(a, b, c, d, x, s, ac) a = b + (RL((a + G(b,c,d) + x + ac),s))
#define HH(a, b, c, d, x, s, ac) a = b + (RL((a + H(b,c,d) + x + ac),s))
#define II(a, b, c, d, x, s, ac) a = b + (RL((a + I(b,c,d) + x + ac),s))
unsigned A,B,C,D,a,b,c,d,i,len,flen[2],x[16];
char filename[200];
FILE *fp;
#define MD5_LEN 32
void md5()
{
    a=A,b=B,c=C,d=D;
    /**//* Round 1 */
    FF (a, b, c, d, x[ 0], 7, 0xd76aa478); /**//* 1 */
    FF (d, a, b, c, x[ 1], 12, 0xe8c7b756); /**//* 2 */
    FF (c, d, a, b, x[ 2], 17, 0x242070db); /**//* 3 */
    FF (b, c, d, a, x[ 3], 22, 0xc1bdceee); /**//* 4 */
    FF (a, b, c, d, x[ 4], 7, 0xf57c0faf); /**//* 5 */
    FF (d, a, b, c, x[ 5], 12, 0x4787c62a); /**//* 6 */
    FF (c, d, a, b, x[ 6], 17, 0xa8304613); /**//* 7 */
    FF (b, c, d, a, x[ 7], 22, 0xfd469501); /**//* 8 */
    FF (a, b, c, d, x[ 8], 7, 0x698098d8); /**//* 9 */
    FF (d, a, b, c, x[ 9], 12, 0x8b44f7af); /**//* 10 */
    FF (c, d, a, b, x[10], 17, 0xffff5bb1); /**//* 11 */
    FF (b, c, d, a, x[11], 22, 0x895cd7be); /**//* 12 */
    FF (a, b, c, d, x[12], 7, 0x6b901122); /**//* 13 */
    FF (d, a, b, c, x[13], 12, 0xfd987193); /**//* 14 */
    FF (c, d, a, b, x[14], 17, 0xa679438e); /**//* 15 */
    FF (b, c, d, a, x[15], 22, 0x49b40821); /**//* 16 */
    /**//* Round 2 */
    GG (a, b, c, d, x[ 1], 5, 0xf61e2562); /**//* 17 */
    GG (d, a, b, c, x[ 6], 9, 0xc040b340); /**//* 18 */
    GG (c, d, a, b, x[11], 14, 0x265e5a51); /**//* 19 */
    GG (b, c, d, a, x[ 0], 20, 0xe9b6c7aa); /**//* 20 */
    GG (a, b, c, d, x[ 5], 5, 0xd62f105d); /**//* 21 */
    GG (d, a, b, c, x[10], 9, 0x02441453); /**//* 22 */
    GG (c, d, a, b, x[15], 14, 0xd8a1e681); /**//* 23 */
    GG (b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /**//* 24 */
    GG (a, b, c, d, x[ 9], 5, 0x21e1cde6); /**//* 25 */
    GG (d, a, b, c, x[14], 9, 0xc33707d6); /**//* 26 */
    GG (c, d, a, b, x[ 3], 14, 0xf4d50d87); /**//* 27 */
    GG (b, c, d, a, x[ 8], 20, 0x455a14ed); /**//* 28 */
    GG (a, b, c, d, x[13], 5, 0xa9e3e905); /**//* 29 */
    GG (d, a, b, c, x[ 2], 9, 0xfcefa3f8); /**//* 30 */
    GG (c, d, a, b, x[ 7], 14, 0x676f02d9); /**//* 31 */
    GG (b, c, d, a, x[12], 20, 0x8d2a4c8a); /**//* 32 */
    /**//* Round 3 */
    HH (a, b, c, d, x[ 5], 4, 0xfffa3942); /**//* 33 */
    HH (d, a, b, c, x[ 8], 11, 0x8771f681); /**//* 34 */
    HH (c, d, a, b, x[11], 16, 0x6d9d6122); /**//* 35 */
    HH (b, c, d, a, x[14], 23, 0xfde5380c); /**//* 36 */
    HH (a, b, c, d, x[ 1], 4, 0xa4beea44); /**//* 37 */
    HH (d, a, b, c, x[ 4], 11, 0x4bdecfa9); /**//* 38 */
    HH (c, d, a, b, x[ 7], 16, 0xf6bb4b60); /**//* 39 */
    HH (b, c, d, a, x[10], 23, 0xbebfbc70); /**//* 40 */
    HH (a, b, c, d, x[13], 4, 0x289b7ec6); /**//* 41 */
    HH (d, a, b, c, x[ 0], 11, 0xeaa127fa); /**//* 42 */
    HH (c, d, a, b, x[ 3], 16, 0xd4ef3085); /**//* 43 */
    HH (b, c, d, a, x[ 6], 23, 0x04881d05); /**//* 44 */
    HH (a, b, c, d, x[ 9], 4, 0xd9d4d039); /**//* 45 */
    HH (d, a, b, c, x[12], 11, 0xe6db99e5); /**//* 46 */
    HH (c, d, a, b, x[15], 16, 0x1fa27cf8); /**//* 47 */
    HH (b, c, d, a, x[ 2], 23, 0xc4ac5665); /**//* 48 */
    /**//* Round 4 */
    II (a, b, c, d, x[ 0], 6, 0xf4292244); /**//* 49 */
    II (d, a, b, c, x[ 7], 10, 0x432aff97); /**//* 50 */
    II (c, d, a, b, x[14], 15, 0xab9423a7); /**//* 51 */
    II (b, c, d, a, x[ 5], 21, 0xfc93a039); /**//* 52 */
    II (a, b, c, d, x[12], 6, 0x655b59c3); /**//* 53 */
    II (d, a, b, c, x[ 3], 10, 0x8f0ccc92); /**//* 54 */
    II (c, d, a, b, x[10], 15, 0xffeff47d); /**//* 55 */
    II (b, c, d, a, x[ 1], 21, 0x85845dd1); /**//* 56 */
    II (a, b, c, d, x[ 8], 6, 0x6fa87e4f); /**//* 57 */
    II (d, a, b, c, x[15], 10, 0xfe2ce6e0); /**//* 58 */
    II (c, d, a, b, x[ 6], 15, 0xa3014314); /**//* 59 */
    II (b, c, d, a, x[13], 21, 0x4e0811a1); /**//* 60 */
    II (a, b, c, d, x[ 4], 6, 0xf7537e82); /**//* 61 */
    II (d, a, b, c, x[11], 10, 0xbd3af235); /**//* 62 */
    II (c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /**//* 63 */
    II (b, c, d, a, x[ 9], 21, 0xeb86d391); /**//* 64 */
    A += a;
    B += b;
    C += c;
    D += d;
}
int CalcFileMD5(char *filename, char *md5_sum)
{
        if (filename[0]==34) filename[strlen(filename)-1]=0,strcpy(filename,filename+1);
        if (!strcmp(filename,"exit")) exit(0);
        if (!(fp=fopen(filename,"rb"))) //
        {
            printf("Can not open this file!\n");
            return 0;
        }
        fseek(fp, 0, SEEK_END);
        if((len=ftell(fp))==-1)
        {
            printf("Sorry! Can not calculate files which larger than 2 GB!\n");
            fclose(fp);
            return 0;
        }
        rewind(fp);
        A=0x67452301,B=0xefcdab89,C=0x98badcfe,D=0x10325476;
        flen[1]=len/0x20000000;
        flen[0]=(len%0x20000000)*8;
        memset(x,0,64);
        fread(&x,4,16,fp);
        for(i=0; i<len/64; i++)
        {
            md5();
            memset(x,0,64);
            fread(&x,4,16,fp);
        }
        ((char*)x)[len%64]=128;
        if(len%64>55) md5(),memset(x,0,64);
        memcpy(x+14,flen,8);
        md5();
        fclose(fp);
        sprintf(md5_sum,"%08x%08x%08x%08x",PP(A),PP(B),PP(C),PP(D));
return 1;
}
int main(int argc, char* argv[])
{
    char md5_sum[MD5_LEN + 1];
    if(!CalcFileMD5("./MD5C.c", md5_sum))
puts("Error occured!");
    else
       printf("Success! MD5 sum is :%s \n", md5_sum);
}

 

|

发表评论