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md5有什么用

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最好能直接读取文件,并计算 , 坦克世界安装时源文件损坏,有两个。我用md5码校验器校验,发现md5码和官方的全都不一样,不知道是不是我用法不对,md5码校验有两个按钮,一个是:生成文件的md5校验码;另一个是生成字符的md5校验码 , 我下载了一个深度的系统,用md5值验证工具进行了验证,可是验证的结果和系统上的md5值不一样的,请问这样的系统,是不是被别人植入了病毒或是木马一类的东西,改动过,可以用吗,有没有危险的 , 网上找了很多MD5算法可是没有主函数,也没有说明。不知道要怎么用啊!求一个能用的MD5算法,有主函数的。谢谢。
用C或者是C++写的哦! 不愿意公布的给我邮箱也可...

md5加密有什么作用: 一般从事软件编程打包时或重要文件使用MD5加密,可以起到防止破解或被人任意查看的目的

vb.net中的防错使用md5有什么作用: Imports System.IO
Imports System.Security
Imports System.Security.Cryptography
Imports System.Text

Public Function funcMD5(ByVal str As String) As String
Return BitConverter.ToString(CType(CryptoConfig.CreateFromName("MD5"), HashAlgorithm).ComputeHash((New UnicodeEncoding).GetBytes(Trim(str))))
End Function

有没有使用C++来计算文件MD5的库: C/C++直接使用rfc1321标准即可,不需要什么库,简单直接

链接:http://tools.ietf.org/html/rfc1321

global.h -- global header file
md5.h -- header file for MD5
md5c.c -- source code for MD5

md5校验工具有用吗 好像很无聊啊 文件不能用的话就解压错误为什么还得用这个软件: MD5是用于检验文件的完整性和正确性的,如果下载的文件MD5和网上提供的MD5不符,那就表示这个文件已经破坏或是被别人修改过.

VB6.0中 MD5生成的算法是16位字符 可以改成8位吗? 用VB6.0生成8位的数字的算法有什么样的?: md5_ = LCase(WordToHex(a))'8位
'md5_ = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))'32位
'md5_ = LCase(WordToHex(b) & WordToHex(c))'16位i

坦克世界安装时源文件损坏,有两个。我用md5码校验器校验,发现md5码和官方的全都不一样,不知道是: 我安装可是一路损坏呢。。。忽略了n次最后装不了了,同求解决方法

系统的md5值不一样,能用吗: 这样的系统肯定改动过,因为世界上所有的文件生成的MD5值都是不同的(目前来说是的),建议你别用改动过的,危险性是有的~

求一个能用的MD5算法。要求有主函数的。谢谢!: 你把下面的代码复制下来,保存成md5lib.h,然后在C代码中:
#include "md5lib.h" 即可
其中:
char* MDString (char *string);是对字符串进行MD5
char* MDFile (char *filename);是对文件进行MD5
以下是代码
//--------------------------------
/* MD5lib.h - md5 library
*/

/* Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
rights reserved.

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.
*/

/* The following makes MD default to MD5 if it has not already been
defined with C compiler flags.
*/

#include <stdio.h>
#include <time.h>
#include <string.h>

#define MD 5

/* GLOBAL.H - RSAREF types and constants
*/

/* PROTOTYPES should be set to one if and only if the compiler supports
function argument prototyping.
The following makes PROTOTYPES default to 0 if it has not already
been defined with C compiler flags.
*/
#ifndef PROTOTYPES
#define PROTOTYPES 0
#endif

/* 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;

/* PROTO_LIST is defined depending on how PROTOTYPES is defined above.
If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it
returns an empty list.
*/
#if PROTOTYPES
#define PROTO_LIST(list) list
#else
#define PROTO_LIST(list) ()
#endif

/* Length of test block, number of test blocks.
*/
#define TEST_BLOCK_LEN 1000
#define TEST_BLOCK_COUNT 1000

/* 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 21

char* MDString PROTO_LIST ((char *));
char* MDFile PROTO_LIST ((char *));
char* hmac_md5(char* text, char* key);

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;

/*void MD5Init PROTO_LIST ((MD5_CTX *));
void MD5Update PROTO_LIST
((MD5_CTX *, unsigned char *, unsigned int));
void MD5Final PROTO_LIST ((unsigned char [16], MD5_CT X *));

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((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);}
void MD5Init (MD5_CTX *context);
void MD5Update(MD5_CTX *context, unsigned char *input,unsigned int inputLen);

void MD5Final (unsigned char digest[16], MD5_CTX *context);
static 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);

/* 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-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (MD5_CTX *context, unsigned char *input,unsigned int inputLen )
/* context */
/* input block */
/* length of input block */
{
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;
}
else
i = 0;

/* Buffer remaining input */
MD5_memcpy
((POINTER)&context->buffer[index], (POINTER)&input[i],
inputLen-i);
}

/* MD5 finalization. Ends an MD5 message-digest operation, writing the
the message digest and zeroizing the context.
*/
void MD5Final (unsigned char digest[16], MD5_CTX *context)
/* message digest */
/* 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,(unsigned char*) 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])

{
int i=0;

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 is
a 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 is
a 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;
}

/* Digests a string and prints the result.
*/
char* MDString (char *string)

{
MD5_CTX context;
unsigned char digest[16];
char output1[32];
static char output[33]={""};
unsigned int len = strlen (string);
int i;
MD5Init (&context);
MD5Update (&context, (unsigned char*)string, len);
MD5Final (digest, &context);

for (i = 0; i < 16; i++)
{sprintf(&(output1[2*i]),"%02x",(unsigned char)digest[i]);
sprintf(&(output1[2*i+1]),"%02x",(unsigned char)(digest[i]<<4));
}
for(i=0;i<32;i++)
output[i]=output1[i];
return output;
}

/* Digests a file and prints the result.
*/
char* MDFile (char *filename)

{ static char output[33]={""};
FILE *file;
MD5_CTX context;
int len;
unsigned char buffer[1024], digest[16];
int i;
char output1[32];
if ((file = fopen (filename, "rb")) == NULL)
{ printf ("%s can't be openedn", filename);
return 0;
}
else {
MD5Init (&context);
while (len = fread (buffer, 1, 1024, file))
MD5Update (&context, buffer, len);
MD5Final (digest, &context);
fclose (file);
for (i = 0; i < 16; i++)
{sprintf(&(output1[2*i]),"%02x",(unsigned char)digest[i]);
sprintf(&(output1[2*i+1]),"%02x",(unsigned char)(digest[i]<<4));
}
for(i=0;i<32;i++)
output[i]=output1[i];
return output;
}
}

char* hmac_md5(char* text,char* key)
{
char digest[16];
char output1[32];
static char output[33]={""};
MD5_CTX context;
unsigned char k_ipad[65]; /* inner padding -
* key XORd with ipad
*/
unsigned char k_opad[65]; /* outer padding -
* key XORd with opad
*/
unsigned char tk[16];
int i;
int text_len = strlen (text);
int key_len=strlen(key);
/* if key is longer than 64 bytes reset it to key=MD5(key) */
if (key_len > 64) {

MD5_CTX tctx;

MD5Init(&tctx);
MD5Update(&tctx,(unsigned char*) key, key_len);
MD5Final(tk, &tctx);

key = (char*)tk;
key_len = 16;
}

/*
* the HMAC_MD5 transform looks like:
*
* MD5(K XOR opad, MD5(K XOR ipad, text))
*
* where K is an n byte key
* ipad is the byte 0x36 repeated 64 times
* opad is the byte 0x5c repeated 64 times
* and text is the data being protected
*/

/* start out by storing key in pads */

/*bzero( k_ipad, sizeof k_ipad);
bzero( k_opad, sizeof k_opad);
*/

for(i=0;i<65;i++)
k_ipad[i]=(unsigned char)0;
for(i=0;i<65;i++)
k_opad[i]=(unsigned char)0;

/*bcopy( key, k_ipad, key_len);
bcopy( key, k_opad, key_len);
*/
for(i=0;i<key_len;i++)
{k_ipad[i]=(unsigned char)key[i];
k_opad[i]=(unsigned char)key[i];
}

/* XOR key with ipad and opad values */
for (i=0; i<64; i++) {
k_ipad[i] ^= 0x36;
k_opad[i] ^= 0x5c;
}
/*
* perform inner MD5
*/
MD5Init(&context); /* init context for 1st
* pass */
MD5Update(&context, k_ipad, 64); /* start with inner pad */
MD5Update(&context, (unsigned char*)text, text_len); /* then text of datagram

*/
MD5Final((unsigned char*)digest, &context); /* finish up 1st pass */
/*
* perform outer MD5
*/
MD5Init(&context); /* init context for 2nd
* pass */
MD5Update(&context, k_opad, 64); /* start with outer pad */
MD5Update(&context,(unsigned char*) digest, 16); /* then results of 1st
* hash */
MD5Final((unsigned char*)digest, &context); /* finish up 2nd pass */
for (i = 0; i < 16; i++)
{sprintf(&(output1[2*i]),"%02x",(unsigned char)digest[i]);
sprintf(&(output1[2*i+1]),"%02x",(unsigned char)(digest[i]<<4));
}
for(i=0;i<32;i++)
output[i]=output1[i];
return output;
}

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