C语言实现MD5算法 #include#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) > (32 - (y))))//x向左循环移y位#define PP(x) (x>8)&0xff00)|(x>>24)//将x高低位互换,例如PP(aabbccdd)=ddccbbaa#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]; //i临时变量,len文件长,flen[2]为64位二进制表示的文件初始长度char filename[200]; //文件名FILE *fp;void md5(){
//MD5核心算法,供64轮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;}main(){while(1){
printf("Input file:");
gets(filename);
//用get函数,避免scanf以空格分割数据,
if (filename[0]==34) filename[strlen(filename)-1]=0,strcpy(filename,filename+1);//支持文件拖曳,但会多出双引号,这里是处理多余的双引号
if (!strcmp(filename,"exit")) exit(0);//输入exit退出
if (!(fp=fopen(filename,"rb"))) {printf("Can not open this file!\n");continue;}//以二进制打开文件
fseek(fp, 0, SEEK_END);//文件指针转到文件末尾
if((len=ftell(fp))==-1) {printf("Sorry! Can not calculate files which larger than 2 GB!\n");fclose(fp);continue;}//ftell函数返回long,最大为2GB,超出返回-1
rewind(fp);//文件指针复位到文件头
A=0x67452301,B=0xefcdab89,C=0x98badcfe,D=0x10325476; //初始化链接变量
flen[1]=len/0x20000000;
//flen单位是bit
flen[0]=(len%0x20000000)*8;
memset(x,0,64); //初始化x数组为0
fread(&x,4,16,fp);//以4字节为一组,读取16组数据
for(i=0;i55) md5(),memset(x,0,64);
memcpy(x+14,flen,8);
//文件末尾加入原文件的bit长度
md5();
fclose(fp);
printf("MD5 Code:%08x%08x%08x%08x\n",PP(A),PP(B),PP(C),PP(D));//高低位逆反输出}}
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