目标    ：    Winace v2.04.
工具    ：      SoftIce v4.05 for Win9x, only!
特别需要你的耐心与细心

简要说明:
    注册验证算法下面我写了，主要想说的是，这个东西并不是太难，是密码学算法
    分析的入门级程度，特别是对分析RSA来说，是一个很好的例子。算法中应用CRC32
    作为一个验证点，也就是密文的一部分，用它组合的密文通过RSA进行RSA_DECODE
    得到明文，然后通过一个解码过程最后得到注册码。
        
    验证过程：
    注册码检测时，是先把输入的fakeKey经过查表转换成一个序列 ---> "indexFkey"
    然后把indexFkey通过一个ENCODER(非常简单的双向算法，和MIRC中用到的算法类似，
    比MIRC中的又稍微复杂点)进行编码，得到的结果进行RSA_ENCODE，这里用到的E = 3。
    之后的结果和上面说到的密文进行校验。
    
    keygen的流程：
        
    其实挺简单，就是写的时候要细心些。我的程序中频繁运用了转换函数(char* to
    hex*, hex* to char*)，其实用freelip运算RSA后的结果(verylong)就可以直接
    构造生成函数，对此结果进行解码从而得到真正的注册码。
        
    baseStr = strupr( username + first3CharOfRegCode );
    Crc32ChkSum = CRC32( baseStr );
    ConstructCipherText( buf, Crc32ChkSum + SomeOtherKeyPoint );
    /* 这里需要你自己去找检测点了，还有如何构造密文序列 */
    indexFkey = RSA_DECODE( ( verylong type )buf, d, n );
    ValidRegCode = DeCoderSimple( indexFkey, table );
    
    就这样吧，再说就没有什么意义了。还是那句话，算法简单，不过要细心！
        
                                Deo Gratias!
                                 2001-11-5
                                arbiter[ccg].

/* --------------------------------------------------------------------------- */
/*            Winace v2.04 Key Generator by arbiter.                    */
/*                                          */
/* KeyCheck routine: RSA120 + CRC32_Modified + authorMadeSimpleEncoder :)      */
/*                                            */
/* level      : Elementary phase of reversing of apply cryptography.      */
/* lib. & compiling: You need the freelip to compile this source code, and    */
/*              do not forget adding the "ws2_32.lib" to your project    */
/*              which will be used by freelip.                  */
/*                                                */
/* freelip is what i use to calculate the RSA, i prefer this one then the      */
/* miracl, because of it is an excellent and fully open source code libaray.  */
/* --------------------------------------------------------------------------- */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include "lip.h"
#pragma comment( lib, "freelib.lib" )

extern time();
typedef unsigned char    BYTE;
typedef unsigned long    DWORD;
#define    UpdCRC32( octet, crc ) \
{ \
    DWORD temp = crc & 0x000000ff; \
    ( crc ) >>= 8; \
    ( crc ) ^= CRC32_tab[( BYTE )octet ^ temp]; \
}    

static char ctable[] = "0123456789ABCDEFGHIJKMNPQRSTUVWXYZ";
static char leadingStr[] = "CCG";
/* RSA120 modulus N and private key D, public key E = 3. 8^) */
static char modulus_N[] = "E9EF370510CB9DB54CA78CC94A3495";
static char private_D[] = "9BF4CF58B5DD13AF6A905C439A8E6B";
/* standard CRC32 hash consts table, modified CRC32 hash routine. */
const DWORD CRC32_tab[] =
{
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
    0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
    0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
    0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
    0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
    0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
    0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
    0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
    0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
    0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
    0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
    0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
    0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
    0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
    0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
    0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
    0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
    0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
    0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
    0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
    0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
    0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
    0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
    0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
    0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
    0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
    0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

DWORD CRC32_Modify( char *hashBuf, int len )
{
    int i;
    register DWORD checksum = 0xffffffff;
    register DWORD temp = 0x0;
    for( i = 0; len; len--, i++ )
        UpdCRC32( hashBuf[i], checksum );
    return checksum;    
}

/* conversion code. grab it from tE!'s keygen. haha.
  i'm jerking around here of my lamer gen. routine
  over the conversion ;-) */

char eulav( long i );
void zhconvert( verylong a, char *dbuff, int CodeLen )
{
    static     char *b;
    register long i,j,cnt = 0;

    b = ( char* )malloc( ( size_t )( a[0] << 3 ) );

    if ( !b ) return;

    do    {
        b[cnt] = eulav( a[1] & 15 );
        cnt++;
        zrshift( a, ( long )4, &a );
    }
    while ( ( a[1] != 0 ) || ( a[0] != 1 ) || ( cnt < CodeLen ) );

    b[cnt] &= 0x00;

    j = cnt - 1;
    for( i = 0; i < cnt; i++ )
    {
        dbuff[i] = b[j];
        j--;
    }
    dbuff[i] = 0x00;
    free( b );
}

int CheckBound( int x )
{
    return( ( ( x >= 0x30 && x <= 0x39 ) ||
              ( x >= 0 && x <= 9 ) )? 0x30 : 0x37 );
}

void LoadDd( DWORD *x, char *buf )
{
    int i;
    BYTE nibble_H = 0;
    BYTE nibble_L = 0;
    DWORD tByte = 0;
    for( i = 0; i < 3; i++ )
    {
        nibble_H = buf[i * 2] - CheckBound( buf[i * 2] );
        nibble_L = buf[i * 2 + 1] - CheckBound( buf[i * 2 +1] );
        tByte = nibble_H * 16 + nibble_L;
        ( *x ) <<= 8;
        ( *x ) |= tByte;
    }
}

void StoreDd( char *buf, DWORD x )
{
    int i, j;
    BYTE nibble_H = 0;
    BYTE nibble_L = 0;
    BYTE *bx = ( BYTE* )&x;
    for( i = 2, j = 0; i >= 0; i-- )
    {
        nibble_H = ( bx[i] & 0xF0 ) >> 4;
        nibble_L = bx[i] & 0x0F;
        buf[j++] = nibble_H + CheckBound( nibble_H );
        buf[j++] = nibble_L + CheckBound( nibble_L );
    }
}

void GenRegCode( char *regCode, char *cText )
{
    int i = 2;
    int j;
    BYTE lmByte = 0;    
    DWORD X_man = 0;
    char tmpBuf[30] = { 0x00 }, *p_tmpBuf = tmpBuf;
    strcpy( tmpBuf, cText );
    strcpy( regCode, leadingStr );
    while( i++ < 0x1a )
    {
        for( j = 0; j < 5; j++ )
        {
            LoadDd( &X_man, p_tmpBuf );
            X_man |= lmByte << 24;
            lmByte = ( BYTE )( X_man % 0x22 );
            X_man = ( X_man - lmByte ) / 0x22;
            StoreDd( p_tmpBuf, X_man );
            X_man &= 0;
            if( j == 4 )
            {
                regCode[i] = ctable[lmByte];
                lmByte &= 0;
            }
            p_tmpBuf += 6;
        }
        p_tmpBuf = tmpBuf;
    }
}

void main( void )
{
    verylong    n = 0;
    verylong    d = 0;
    verylong    m = 0;
    int  len;
    DWORD sum;
    BYTE first, *pb;
    char userName[30];
    char userCode[50];
    
    char tempBuf[20] = { 0x00 };
    BYTE pText[60]      = { 0x00 };
    
    srand( time( NULL ) );
    memset( userName, 0, 30 );
    memset( userCode, 0, 50 );
    fprintf( stderr, "Winace v2.04 key Generator by arbiter.\n\n" );
    fprintf( stderr, "Your username : " );
    gets( userName );
    puts( "\n" );
    
    /* Begin constructing the cipher text in order to have RSA */
    strcpy( tempBuf, userName );
    strcat( tempBuf, leadingStr );
    strupr( tempBuf );
    len = strlen( tempBuf );
    sum = CRC32_Modify( tempBuf, len );
    pb = ( BYTE* )&sum;
    while( 1 )
    {
        first =  rand() % 0xff;
        if( ( pb[2] ^ first ) & 2 )
            break;
    }
    pText[0] = first;
    memcpy( pText + 3, pb, 4 );
    pText[0x0b] = ( char )0xAB;
    pText[0x0d] = ( char )0x36;
    
    /* Begin RSA */
    zstrtozbas( modulus_N, ( long )16, &n );
    zstrtozbas( private_D, ( long )16, &d );
    zultoz( ( DWORD* )pText, 4, &m );
    zexpmod( m, d, n, &m );
    zhconvert( m, pText, 30 );
        
    zfree( &n );
    zfree( &d );
    zfree( &m );
    /* End RSA */    
    
    /* Generate register Serial */
    GenRegCode( userCode, pText );
    
    fprintf( stderr, "Your userCode : %s\n", userCode );
    getch();
}