help: BRE decode error

[Jue Wu]

Hi,everyone,

I modified "test.cpp", created a new command to encrypt a string using RSA.The 
encrypted string is printed to the standard output.my new command is:

/cryptest re publickeyFile "String to be encrypted" RandomSeed

First, I ran the command:
/cryptest g 1024 privatekey.txt publickey.txt 123456

to generate RSA priv/public keys.

Then,I ran my new command:
/cryptest re publickey.txt "This is a test" 112233

It is succeeded.

Third,I wrote a new C++ program(test_EncryptRSAString.cpp,see P.S.) to run these two 
command. When running this program,I can only generate RSA piv/public keys,but I can't 
get the encrypted string.The error message is:

CryptoPP::Exception caught: BER decode error

Why? I can't find the reason.

I will be very appreciated if someone can help me.



　　　　　　　　Jue Wu
[EMAIL PROTECTED]
　　　　　　　　　　2004-09-07



P.S.:
OS: Redhat Linux 9.0, (kernel version: 2.4.20-8)
Gcc version: 3.2.2 20030222
version of Crypto++: 5.1 

test_EncryptRSAString.cpp:

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

#define MAXNUM  2048+1

void GenerateRSAKey(){
        char CMDPATH[256];
        FILE *piprtn;
        char lineread[2*MAXNUM];
        int i=0,j=0;
        
        // set up the command parameter
        strcpy(CMDPATH,"./cryptest g 1024");
        strcat(CMDPATH," ");//add a space
        strcat(CMDPATH,"privkey.txt pubkey.txt");//second parameter is where to save 
the key
        strcat(CMDPATH," ");
        strcat(CMDPATH, "123456");//forth parameter is RandomSeed
        
        //run the command
    piprtn=popen(CMDPATH,"r");
        pclose(piprtn); 
}

void RSAEncrypt(char tobeEncrypted[],char Encrypted[]){ 
        char CMDPATH[256];
        FILE *piprtn;
        int i=0;
        
        //set up the command parameter
        strcpy(CMDPATH,"./cryptest re");
        strcat(CMDPATH," ");//add a space
        strcat(CMDPATH,"pubkey.txt");//second parameter is where to save the key       
 
        strcat(CMDPATH," ");
        strcat(CMDPATH,tobeEncrypted);
        strcat(CMDPATH," ");
        strcat(CMDPATH,"112244");//forth parameter is seed
        printf("s\n",CMDPATH);
        
        //run the command
        piprtn=popen(CMDPATH,"r"); 

        //get the encrypted string from standard output
        while(!feof(piprtn)){
                Encrypted[i]=fgetc(piprtn);
        }       
        pclose(piprtn); 
        Encrypted[--i]='\0';    
        printf("s\n",Encrypted);
}

int main()
{
        
        GenerateRSAKey();
        char toencrypt[]="I am a girl";
        char encrypted[MAXNUM];
        RSAEncrypt(toencrypt, encrypted);       
        exit(0);        
}