计算给定字符或给定文件的Md5

发布时间:2020-06-28 发布网站:脚本之家
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 http://hi.baidu.com/keepzeal/blog/item/528ae3365bfc93dba3cc2bba.html

 

/*
* 带密钥的md5算法库md5lib.h共有下列函数:
*
* char* MDString (char *);
* 输入任意一个字符串,经过md5运算后,返回32个字符长的字符串
*
* char* MDFile (char *);
* 输入任意一个文件名,文件内容经过md5运算后,返回32个字符长的字符串
*
* char* hmac_md5(char* text,char* key);
* 输入任意一个字符串text,和一个用做密钥的字符串key,
* 经过hmac_md5算法处理,返回处理结果:一个定长字符串(32个字符)
*/

/* 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 1
#endif

typedef unsigned char *POINTER; /* POINTER defines a generic pointer type */
typedef unsigned short int UINT2; /* UINT2 defines a two byte word */
typedef unsigned long int UINT4; /* UINT4 defines a four byte word */

/* 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;

static unsigned char PADDING[64] = {
0x80,
0,0
};

/* F,G,H and I are basic MD5 functions. */
#define F(x,y,z) (((x) & (y)) | ((~x) & (z)))
#define G(x,z) (((x) & (z)) | ((y) & (~z)))
#define H(x,z) ((x) ^ (y) ^ (z))
#define I(x,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,ac) { /
(a) += G ((b),(s)); /
(a) += (b); /
}
#define HH(a,ac) { /
(a) += H ((b),(s)); /
(a) += (b); /
}
#define II(a,ac) { /
(a) += I ((b),(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 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,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,x[ 0],S11,0xd76aa478); /* 1 */
FF (d,a,x[ 1],S12,0xe8c7b756); /* 2 */
FF (c,x[ 2],S13,0x242070db); /* 3 */
FF (b,x[ 3],S14,0xc1bdceee); /* 4 */
FF (a,x[ 4],0xf57c0faf); /* 5 */
FF (d,x[ 5],0x4787c62a); /* 6 */
FF (c,x[ 6],0xa8304613); /* 7 */
FF (b,x[ 7],0xfd469501); /* 8 */
FF (a,x[ 8],0x698098d8); /* 9 */
FF (d,x[ 9],0x8b44f7af); /* 10 */
FF (c,x[10],0xffff5bb1); /* 11 */
FF (b,x[11],0x895cd7be); /* 12 */
FF (a,x[12],0x6b901122); /* 13 */
FF (d,x[13],0xfd987193); /* 14 */
FF (c,x[14],0xa679438e); /* 15 */
FF (b,x[15],0x49b40821); /* 16 */

/* Round 2 */
GG (a,S21,0xf61e2562); /* 17 */
GG (d,S22,0xc040b340); /* 18 */
GG (c,S23,0x265e5a51); /* 19 */
GG (b,S24,0xe9b6c7aa); /* 20 */
GG (a,0xd62f105d); /* 21 */
GG (d,0x2441453); /* 22 */
GG (c,0xd8a1e681); /* 23 */
GG (b,0xe7d3fbc8); /* 24 */
GG (a,0x21e1cde6); /* 25 */
GG (d,0xc33707d6); /* 26 */
GG (c,0xf4d50d87); /* 27 */
GG (b,0x455a14ed); /* 28 */
GG (a,0xa9e3e905); /* 29 */
GG (d,0xfcefa3f8); /* 30 */
GG (c,0x676f02d9); /* 31 */
GG (b,0x8d2a4c8a); /* 32 */

/* Round 3 */
HH (a,S31,0xfffa3942); /* 33 */
HH (d,S32,0x8771f681); /* 34 */
HH (c,S33,0x6d9d6122); /* 35 */
HH (b,S34,0xfde5380c); /* 36 */
HH (a,0xa4beea44); /* 37 */
HH (d,0x4bdecfa9); /* 38 */
HH (c,0xf6bb4b60); /* 39 */
HH (b,0xbebfbc70); /* 40 */
HH (a,0x289b7ec6); /* 41 */
HH (d,0xeaa127fa); /* 42 */
HH (c,0xd4ef3085); /* 43 */
HH (b,0x4881d05); /* 44 */
HH (a,0xd9d4d039); /* 45 */
HH (d,0xe6db99e5); /* 46 */
HH (c,0x1fa27cf8); /* 47 */
HH (b,0xc4ac5665); /* 48 */

/* Round 4 */
II (a,S41,0xf4292244); /* 49 */
II (d,S42,0x432aff97); /* 50 */
II (c,S43,0xab9423a7); /* 51 */
II (b,S44,0xfc93a039); /* 52 */
II (a,0x655b59c3); /* 53 */
II (d,0x8f0ccc92); /* 54 */
II (c,0xffeff47d); /* 55 */
II (b,0x85845dd1); /* 56 */
II (a,0x6fa87e4f); /* 57 */
II (d,0xfe2ce6e0); /* 58 */
II (c,0xa3014314); /* 59 */
II (b,0x4e0811a1); /* 60 */
II (a,0xf7537e82); /* 61 */
II (d,0xbd3af235); /* 62 */
II (c,0x2ad7d2bb); /* 63 */
II (b,0xeb86d391); /* 64 */

state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;

/* Zeroize sensitive information. */
MD5_memset ((POINTER)x,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 int len)
{
unsigned int i,j;

   for (i = 0,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]),(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 i,len;
unsigned char buffer[1024],digest[16];
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]),(unsigned char)digest[i]);
        sprintf(&(output1[2*i+1]),(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,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,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]),(unsigned char)digest[i]);      sprintf(&(output1[2*i+1]),(unsigned char)(digest[i]<<4));     }     for(i=0;i<32;i++)     output[i]=output1[i];     return output;     }

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