在线请教路过的高手 crypto++ RSA解密问题.

WaltCheung

I download crypto++5.1 and try to use it to decrypt a RSA(512)  encrpted message. Howerver, I got (d, n) instead of private key,  I know I shound use c^d%n to get plaintest, but I can't get right text. I don't know what's the problem.
The fowllowing is my codes

Decrypt(char * encryptedfilename)
{   
Integer d ("0x85A9244F6FE917A946235B3F06817C584707CD4D8699ED877CF54F705065264727D5FB6E2B140155CC81E1EA494CA5E73A958DA3E5E00B66905CA8E9F03B8E2B";     
   Integer n ("0xC87DB67727DDA37DE93508DE89C23A846A8BB3F449E6E44B3B6FF7287897B96C84336BE97236413344294612F2565AF877D18CA34415E3B97B267DD65569780D";     
  
   infile.open(encryptedfilename,ios::binary);
   int index=0;
   while (!infile.eof())
   {
    infile>;>;pdata[index++] ;
   }
   infile.close();
   pdata[index] = 0 ;

  p[0] = '0'; p[1] = 'x' ;
   HexEncoder hexEncoder1;
   hexEncoder1.Put(pdata,index);
   hexEncoder1.MessageEnd();
   hexEncoder1.Get((unsigned char*)(p+2),index*2);
  
  Integer c((char*)p);

    RSAFunction rsa;        //rsa
    rsa.Initialize(n,d);         
    plaintext = rsa.ApplyFunction(c);   

byte* buffer=new byte[1024];
for (int i=0;i<plaintext.ByteCount();i++)
  buffer[plaintext.ByteCount()-1-i]=plaintext.GetByte(i);
buffer[plaintext.ByteCount()]=0;
StringSource(buffer,plaintext.ByteCount(), true, new HexEncoder(new FileSink(cout)));
cout << endl; return 0;
}

结果不对, 哪位高手释疑, 感激之情如滔滔江水.

WaltCheung

Up

fansmore

RSAFunction::Initialize(const Integer &n, const Integer &e);要不是这样
InvertibleRSAFunction::void Initialize(const Integer &n, const Integer &e, const Integer &d);要不是这样
没有Initialize(const Integer &n, const Integer &d);这个函数

我learnc

不会用，我只会用OPENSSL里的RSA加解密

fansmore

可以这样做个函数封装：
RSA:: PrivateKey  GenerateRSAPrivateKey(const Integer &n, const Integer &d, const Integer &e)
{

        InvertibleRSAFunction params;
        params.Initialize(n,e,d);
        RSA:: PrivateKey m_privateKey( params );
        return m_privateKey;

}
RSA:: PublicKey  GenerateRSAPublicKey(const Integer &n, const Integer &e)
{
    RSAFunction params;
    params.Initialize(n,e);
        RSA:: PublicKey m_publicKey( params );
        return m_publicKey;
   
}

[ 本帖最后由 fansmore 于 2009-4-12 20:13 编辑 ]

fansmore

调用时可以这样写：
m_privateKey=GenerateRSAPrivateKey(n, d, e);
m_publicKey=GenerateRSAPublicKey(n, e);