一个C++实现的md5源码

 使用代码

 string c,key;
 cin >> c;
 if( c == "c" ) return(0);


 CMD5 iMD5;
 iMD5.GenerateMD5( (unsigned char*)c.c_str(), c.size() );
 key = iMD5.ToString();

 

Md5.h

 

 #ifndef _MD5_H
 #define _MD5_H

 //#pragma warning(disable:4786)

 #include <string>

 using namespace std;

 /*!
  * Manage MD5.
  */
 class CMD5
 {
 private:
     #define uint8  unsigned char
     #define uint32 unsigned long int

     struct md5_context
     {
         uint32 total[2];
         uint32 state[4];
         uint8 buffer[64];
     };

     void md5_starts( struct md5_context *ctx );
     void md5_process( struct md5_context *ctx, uint8 data[64] );
     void md5_update( struct md5_context *ctx, uint8 *input, uint32 length );
     void md5_finish( struct md5_context *ctx, uint8 digest[16] );

 public:
     //! construct a CMD5 from any buffer
     void GenerateMD5(unsigned char* buffer,int bufferlen);

     //! construct a CMD5
     CMD5();

     //! construct a md5src from char *
     CMD5(const char * md5src);

     //! construct a CMD5 from a 16 bytes md5
     CMD5(unsigned long* md5src);

     //! add a other md5
     CMD5 operator +(CMD5 adder);

     //! just if equal
     bool operator ==(CMD5 cmper);

     //! give the value from equer
     // void operator =(CMD5 equer);

     //! to a string
     string ToString();

     unsigned long m_data[4];
 };
 #endif /* md5.h */

 

Md5.cpp

 

 

 /*
  * RFC 1321 compliant MD5 implementation,
  * by Christophe Devine <[email protected]>;
  * this program is licensed under the GPL.
  */
 #include "Md5.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

 #define GET_UINT32(n,b,i)                                       /
 {                                                               /
     (n) = (uint32) ((uint8 *) b)[(i)]                           /
       | (((uint32) ((uint8 *) b)[(i)+1]) <<  8)                 /
       | (((uint32) ((uint8 *) b)[(i)+2]) << 16)                 /
       | (((uint32) ((uint8 *) b)[(i)+3]) << 24);                /
 }

 #define PUT_UINT32(n,b,i)                                       /
 {                                                               /
     (((uint8 *) b)[(i)]  ) = (uint8) (((n)      ) & 0xFF);      /
     (((uint8 *) b)[(i)+1]) = (uint8) (((n) >>  8) & 0xFF);      /
     (((uint8 *) b)[(i)+2]) = (uint8) (((n) >> 16) & 0xFF);      /
     (((uint8 *) b)[(i)+3]) = (uint8) (((n) >> 24) & 0xFF);      /
 }

 //extern pthread_mutex_t mutexMemory;

 void CMD5::md5_starts( struct md5_context *ctx )
 {
     ctx->total[0] = 0;
     ctx->total[1] = 0;
     ctx->state[0] = 0x67452301;
     ctx->state[1] = 0xEFCDAB89;
     ctx->state[2] = 0x98BADCFE;
     ctx->state[3] = 0x10325476;
 }

 void CMD5::md5_process( struct md5_context *ctx, uint8 data[64] )
 {
     uint32 A, B, C, D, X[16];

     GET_UINT32( X[0],  data,  0 );
     GET_UINT32( X[1],  data,  4 );
     GET_UINT32( X[2],  data,  8 );
     GET_UINT32( X[3],  data, 12 );
     GET_UINT32( X[4],  data, 16 );
     GET_UINT32( X[5],  data, 20 );
     GET_UINT32( X[6],  data, 24 );
     GET_UINT32( X[7],  data, 28 );
     GET_UINT32( X[8],  data, 32 );
     GET_UINT32( X[9],  data, 36 );
     GET_UINT32( X[10], data, 40 );
     GET_UINT32( X[11], data, 44 );
     GET_UINT32( X[12], data, 48 );
     GET_UINT32( X[13], data, 52 );
     GET_UINT32( X[14], data, 56 );
     GET_UINT32( X[15], data, 60 );

 #define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))

 #define P(a,b,c,d,k,s,t)                                /
 {                                                       /
     a += F(b,c,d) + X[k] + t; a = S(a,s) + b;           /
 }

     A = ctx->state[0];
     B = ctx->state[1];
     C = ctx->state[2];
     D = ctx->state[3];

 #define F(x,y,z) (z ^ (x & (y ^ z)))

     P( A, B, C, D,  0,  7, 0xD76AA478 );
     P( D, A, B, C,  1, 12, 0xE8C7B756 );
     P( C, D, A, B,  2, 17, 0x242070DB );
     P( B, C, D, A,  3, 22, 0xC1BDCEEE );
     P( A, B, C, D,  4,  7, 0xF57C0FAF );
     P( D, A, B, C,  5, 12, 0x4787C62A );
     P( C, D, A, B,  6, 17, 0xA8304613 );
     P( B, C, D, A,  7, 22, 0xFD469501 );
     P( A, B, C, D,  8,  7, 0x698098D8 );
     P( D, A, B, C,  9, 12, 0x8B44F7AF );
     P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
     P( B, C, D, A, 11, 22, 0x895CD7BE );
     P( A, B, C, D, 12,  7, 0x6B901122 );
     P( D, A, B, C, 13, 12, 0xFD987193 );
     P( C, D, A, B, 14, 17, 0xA679438E );
     P( B, C, D, A, 15, 22, 0x49B40821 );

 #undef F

 #define F(x,y,z) (y ^ (z & (x ^ y)))

     P( A, B, C, D,  1,  5, 0xF61E2562 );
     P( D, A, B, C,  6,  9, 0xC040B340 );
     P( C, D, A, B, 11, 14, 0x265E5A51 );
     P( B, C, D, A,  0, 20, 0xE9B6C7AA );
     P( A, B, C, D,  5,  5, 0xD62F105D );
     P( D, A, B, C, 10,  9, 0x02441453 );
     P( C, D, A, B, 15, 14, 0xD8A1E681 );
     P( B, C, D, A,  4, 20, 0xE7D3FBC8 );
     P( A, B, C, D,  9,  5, 0x21E1CDE6 );
     P( D, A, B, C, 14,  9, 0xC33707D6 );
     P( C, D, A, B,  3, 14, 0xF4D50D87 );
     P( B, C, D, A,  8, 20, 0x455A14ED );
     P( A, B, C, D, 13,  5, 0xA9E3E905 );
     P( D, A, B, C,  2,  9, 0xFCEFA3F8 );
     P( C, D, A, B,  7, 14, 0x676F02D9 );
     P( B, C, D, A, 12, 20, 0x8D2A4C8A );

 #undef F

 #define F(x,y,z) (x ^ y ^ z)

     P( A, B, C, D,  5,  4, 0xFFFA3942 );
     P( D, A, B, C,  8, 11, 0x8771F681 );
     P( C, D, A, B, 11, 16, 0x6D9D6122 );
     P( B, C, D, A, 14, 23, 0xFDE5380C );
     P( A, B, C, D,  1,  4, 0xA4BEEA44 );
     P( D, A, B, C,  4, 11, 0x4BDECFA9 );
     P( C, D, A, B,  7, 16, 0xF6BB4B60 );
     P( B, C, D, A, 10, 23, 0xBEBFBC70 );
     P( A, B, C, D, 13,  4, 0x289B7EC6 );
     P( D, A, B, C,  0, 11, 0xEAA127FA );
     P( C, D, A, B,  3, 16, 0xD4EF3085 );
     P( B, C, D, A,  6, 23, 0x04881D05 );
     P( A, B, C, D,  9,  4, 0xD9D4D039 );
     P( D, A, B, C, 12, 11, 0xE6DB99E5 );
     P( C, D, A, B, 15, 16, 0x1FA27CF8 );
     P( B, C, D, A,  2, 23, 0xC4AC5665 );

 #undef F

 #define F(x,y,z) (y ^ (x | ~z))

     P( A, B, C, D,  0,  6, 0xF4292244 );
     P( D, A, B, C,  7, 10, 0x432AFF97 );
     P( C, D, A, B, 14, 15, 0xAB9423A7 );
     P( B, C, D, A,  5, 21, 0xFC93A039 );
     P( A, B, C, D, 12,  6, 0x655B59C3 );
     P( D, A, B, C,  3, 10, 0x8F0CCC92 );
     P( C, D, A, B, 10, 15, 0xFFEFF47D );
     P( B, C, D, A,  1, 21, 0x85845DD1 );
     P( A, B, C, D,  8,  6, 0x6FA87E4F );
     P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
     P( C, D, A, B,  6, 15, 0xA3014314 );
     P( B, C, D, A, 13, 21, 0x4E0811A1 );
     P( A, B, C, D,  4,  6, 0xF7537E82 );
     P( D, A, B, C, 11, 10, 0xBD3AF235 );
     P( C, D, A, B,  2, 15, 0x2AD7D2BB );
     P( B, C, D, A,  9, 21, 0xEB86D391 );

 #undef F

     ctx->state[0] += A;
     ctx->state[1] += B;
     ctx->state[2] += C;
     ctx->state[3] += D;
 }

 void CMD5::md5_update( struct md5_context *ctx, uint8 *input, uint32 length )
 {
     uint32 left, fill;

     if( ! length ) return;

     left = ( ctx->total[0] >> 3 ) & 0x3F;
     fill = 64 - left;

     ctx->total[0] += length <<  3;
     ctx->total[1] += length >> 29;

     ctx->total[0] &= 0xFFFFFFFF;
     ctx->total[1] += ctx->total[0] < length << 3;

     if( left && length >= fill )
     {
         memcpy( (void *) (ctx->buffer + left), (void *) input, fill );
         md5_process( ctx, ctx->buffer );
         length -= fill;
         input  += fill;
         left = 0;
     }

     while( length >= 64 )
     {
         md5_process( ctx, input );
         length -= 64;
         input  += 64;
     }

     if( length )
     {
         memcpy( (void *) (ctx->buffer + left), (void *) input, length );
     }
 }

 static uint8 md5_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
 };

 void CMD5::md5_finish( struct md5_context *ctx, uint8 digest[16] )
 {
     uint32 last, padn;
     uint8 msglen[8];

     PUT_UINT32( ctx->total[0], msglen, 0 );
     PUT_UINT32( ctx->total[1], msglen, 4 );

     last = ( ctx->total[0] >> 3 ) & 0x3F;
     padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );

     md5_update( ctx, md5_padding, padn );
     md5_update( ctx, msglen, 8 );

     PUT_UINT32( ctx->state[0], digest,  0 );
     PUT_UINT32( ctx->state[1], digest,  4 );
     PUT_UINT32( ctx->state[2], digest,  8 );
     PUT_UINT32( ctx->state[3], digest, 12 );
 }

 void CMD5::GenerateMD5(unsigned char* buffer,int bufferlen)
 {
     struct md5_context context;
     md5_starts (&context);
     md5_update (&context, buffer, bufferlen);
     md5_finish (&context,(unsigned char*)m_data);
 }

 CMD5::CMD5()
 {
     for(int i=0;i<4;i++)
         m_data[i]=0;
 }

 CMD5::CMD5(unsigned long* md5src)
 {
     memcpy(m_data,md5src,16);
 }
 int _httoi(const char *value)
 {
   struct CHexMap
   {
     char chr;
     int value;
   };
   const int HexMapL = 16;
   CHexMap HexMap[HexMapL] =
   {
     {'0', 0}, {'1', 1},
     {'2', 2}, {'3', 3},
     {'4', 4}, {'5', 5},
     {'6', 6}, {'7', 7},
     {'8', 8}, {'9', 9},
     {'a', 10}, {'b', 11},
     {'c', 12}, {'d', 13},
     {'e', 14}, {'f', 15}
   };
   //pthread_mutex_lock(&mutexMemory);
   char *mstr = strdup(value);
   //pthread_mutex_unlock(&mutexMemory);
   char *s = mstr;
   int result = 0;
   if (*s == '0' && *(s + 1) == 'X') s += 2;
   bool firsttime = true;
   while (*s != '/0')
   {
     bool found = false;
     for (int i = 0; i < HexMapL; i++)
     {
       if (*s == HexMap[i].chr)
       {
         if (!firsttime) result <<= 4;
         result |= HexMap[i].value;
         found = true;
         break;
       }
     }
     if (!found) break;
     s++;
     firsttime = false;
   }
   //pthread_mutex_lock(&mutexMemory);
   free(mstr);
   //pthread_mutex_unlock(&mutexMemory);
   return result;
 }


 CMD5::CMD5(const char* md5src)
 {
     if (strcmp(md5src,"")==0)
     {
         for(int i=0;i<4;i++)
             m_data[i]=0;
         return;
     }
     for(int j = 0; j < 16; j++ )
     {
         char buf[10];
         strncpy(buf,md5src,2);
         md5src+=2;
         ((unsigned char*)m_data)[j] = _httoi(buf);
     }
 }

 CMD5 CMD5::operator +(CMD5 adder)
 {
     unsigned long m_newdata[4];
     for(int i=0;i<4;i++)
         m_newdata[i]=m_data[i]^(adder.m_data[i]);
     return CMD5(m_newdata);
 }

 bool CMD5::operator ==(CMD5 cmper)
 {
     return (memcmp(cmper.m_data ,m_data,16)==0);
 }

 //void CMD5::operator =(CMD5 equer)
 //{
 //  memcpy(m_data,equer.m_data ,16);
 //}

 string CMD5::ToString()
 {
     char output[33];
     for(int j = 0; j < 16; j++ )
     {
         sprintf( output + j * 2, "%02x", ((unsigned char*)m_data)[j]);
     }
     return string(output);
 }