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MD5信息摘要算法（MD5 Message-Digest Algorithm），一种被广泛使用的密码散列函数，可以产生出一个128位（16字节）的散列值（hash value），用于确保信息传输完整一致,所以可以用于文件的校验,以确定文件是同一个

现做一个简单的校验器,通过放置到%USERPROFILE%\AppData\Roaming\Microsoft\Windows\SendTo下,即可使用发送到,此执行并将文件的校验值显示出来

#include <stdio.h>
#include <windows.h>
#include <string.h>
#include "md5.h"
extern void show(unsigned char digest[16])
{unsigned int i;for (i = 0; i < 16; i++)printf("%02X", digest[i]);
}
static void get_file_md5 (char *filename,unsigned char digest[16])
{FILE *file;MD5_CTX context;int len;unsigned char buffer[1024];//, digest[16];if ((file = fopen(filename, "rb")) == NULL)printf ("%s can't be opened\n", filename);else {MD5Init (&context);while(0!=(len = fread(buffer, 1, 1024, file))){MD5Update (&context, buffer, len);}MD5Final(digest, &context);fclose(file);//printf("MD5 (%s) = ", filename);//MD5Print(digest);//printf("\n");}
}
void get_nodir_filename(const char*f,char *retbuf,int maxlen)
{   bool found=false;int len=strlen(f);for(int i=len-1;i>=0;i--){if( f[i]=='\\'){int h=0;for(int j=i+1;j<len && j<maxlen && h<maxlen;j++,h++){retbuf[h]=f[j];//printf("%d:%c\n",h,f[j]);}if(h<maxlen){retbuf[h]=0;}found=true;break;}}if(!found){strcpy(retbuf,f);}
}
bool isdir(const char *name)
{return FILE_ATTRIBUTE_DIRECTORY	== GetFileAttributes(name);// struct stat st;// stat(name,&st);// if (S_ISDIR(st.st_mode)){// printf("is a dir\n");// return true;// }else{// printf("is not a dir\n");// }// return false;
}
void get_md5_str(unsigned char digest[16],char str[33])
{const char v[]="0123456789ABCDEF";for(int i=0;i<16;i++){int a=(digest[i]>>4)&0x0f;int b=(digest[i]&0x0f);str[2*i]=v[a];str[2*i+1]=v[b];}str[32]=0;
}
int main(int argc,char **argv)
{for(int i=1;i<argc;i++){if(!isdir(argv[i])){char fname[100];            get_nodir_filename(argv[i],fname,sizeof(fname));printf("file:%s\n",fname);        unsigned char hexbuf[16];get_file_md5(argv[i],hexbuf);     
//method 1            //printf("MD5:");//show(hexbuf);//printf("\n");
//method 2         char strbuf[33];get_md5_str(hexbuf,strbuf);printf("MD5:%s\n",strbuf);}}printf("...press enter to exit...\n");getchar();
}	

/* MD5.H - header file for MD5C.C*//* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.
These notices must be retained in any copies of any part of this
documentation and/or software.*///
/* RSAREF types and constants*//* POINTER defines a generic pointer type */
typedef unsigned char *POINTER;/* UINT2 defines a two byte word */
typedef unsigned short int UINT2;/* UINT4 defines a four byte word */
typedef unsigned long int UINT4;
//
/* MD5 context. */
typedef struct {UINT4 state[4];                                   /* state (ABCD) */UINT4 count[2];        /* number of bits, modulo 2^64 (lsb first) */unsigned char buffer[64];                         /* input buffer */
} MD5_CTX;#ifdef __cplusplus
extern "C" {
#endifvoid MD5Init(MD5_CTX *);
void MD5Update(MD5_CTX *, unsigned char *, unsigned int);
void MD5Final(unsigned char [16], MD5_CTX *);#ifdef __cplusplus
}
#endif

/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm*//* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.These notices must be retained in any copies of any part of this
documentation and/or software.*/#include "md5.h"/* Constants for MD5Transform routine.*/
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21static void MD5Transform(UINT4 [4], unsigned char [64]);
static void Encode(unsigned char *, UINT4 *, unsigned int);
static void Decode(UINT4 *, unsigned char *, unsigned int);
static void MD5_memcpy(POINTER, POINTER, unsigned int);
static void MD5_memset(POINTER, int, unsigned int);static unsigned char PADDING[64] = {0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};/* F, G, H and I are basic MD5 functions.*/
#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)))/* ROTATE_LEFT rotates x left n bits.*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.*/
#define FF(a, b, c, d, x, s, ac) { \(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \(a) = ROTATE_LEFT ((a), (s)); \(a) += (b); \}
#define GG(a, b, c, d, x, s, ac) { \(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \(a) = ROTATE_LEFT ((a), (s)); \(a) += (b); \}
#define HH(a, b, c, d, x, s, ac) { \(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \(a) = ROTATE_LEFT ((a), (s)); \(a) += (b); \}
#define II(a, b, c, d, x, s, ac) { \(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \(a) = ROTATE_LEFT ((a), (s)); \(a) += (b); \}/* MD5 initialization. Begins an MD5 operation, writing a new context.*/
void MD5Init(MD5_CTX *context)  /* context */
{context->count[0] = context->count[1] = 0;/* Load magic initialization constants.*/context->state[0] = 0x67452301;context->state[1] = 0xefcdab89;context->state[2] = 0x98badcfe;context->state[3] = 0x10325476;
}/* MD5 block update operation. Continues an MD5 message-digestoperation, processing another message block, and updating thecontext.*/
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen)
{unsigned int i, index, partLen;/* Compute number of bytes mod 64 */index = (unsigned int)((context->count[0] >> 3) & 0x3F);/* Update number of bits */if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))context->count[1]++;context->count[1] += ((UINT4)inputLen >> 29);partLen = 64 - index;/* Transform as many times as possible.*/if (inputLen >= partLen) {MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);MD5Transform (context->state, context->buffer);for (i = partLen; i + 63 < inputLen; i += 64)MD5Transform(context->state, &input[i]);index = 0;} elsei = 0;/* Buffer remaining input */MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],inputLen-i);
}/* MD5 finalization. Ends an MD5 message-digest operation, writing thethe message digest and zeroizing the context.*/
void MD5Final (unsigned char digest[16], MD5_CTX *context)
{unsigned char bits[8];unsigned int index, padLen;/* Save number of bits */Encode (bits, context->count, 8);/* Pad out to 56 mod 64. */index = (unsigned int)((context->count[0] >> 3) & 0x3f);padLen = (index < 56) ? (56 - index) : (120 - index);MD5Update (context, PADDING, padLen);/* Append length (before padding) */MD5Update (context, bits, 8);/* Store state in digest */Encode (digest, context->state, 16);/* Zeroize sensitive information. */MD5_memset ((POINTER)context, 0, sizeof (*context));
}/* MD5 basic transformation. Transforms state based on block.*/
static void MD5Transform(UINT4 state[4], unsigned char block[64])
{UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];Decode (x, block, 64);/* Round 1 */FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 *//* Round 2 */GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 *//* Round 3 */HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 *//* Round 4 */II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */state[0] += a;state[1] += b;state[2] += c;state[3] += d;/* Zeroize sensitive information. */MD5_memset ((POINTER)x, 0, sizeof (x));
}/* Encodes input (UINT4) into output (unsigned char). Assumes len isa multiple of 4.*/
static void Encode(unsigned char *output, UINT4 *input, unsigned int len)
{unsigned int i, j;for (i = 0, j = 0; j < len; i++, j += 4) {output[j] = (unsigned char)(input[i] & 0xff);output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);}
}/* Decodes input (unsigned char) into output (UINT4). Assumes len isa multiple of 4.*/
static void Decode(UINT4 *output, unsigned char *input, unsigned int len)
{unsigned int i, j;for (i = 0, j = 0; j < len; i++, j += 4)output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}/* Note: Replace "for loop" with standard memcpy if possible.*/
static void MD5_memcpy(POINTER output, POINTER input, unsigned int len)
{unsigned int i;for (i = 0; i < len; i++)output[i] = input[i];
}/* Note: Replace "for loop" with standard memset if possible.*/
static void MD5_memset(POINTER output, int value, unsigned int len)
{unsigned int i;for (i = 0; i < len; i++)((char *)output)[i] = (char)value;
}

使用mingw 32bit版本编译

file:md5_wisepragma.zip
MD5:5BB4898B50F9F16A6E2E84E3DD12B28F

 链接:https://pan.baidu.com/s/13cUTfl_40-UcXgpgF67vuQ 提取码:gr32

参考

https://github.com/leimingshan/MD5

https://github.com/search?q=md5

 https://baike.baidu.com/item/MD5/212708?fr=aladdin