Problems with the function i2d_DSA_PUBKEY(...)

[Tyler Durden]

Hellos, I have some problems with the function  i2d_DSA_PUBKEY.
I want serialize the public key to send this to a client Java for this
can read this public key.
I get serialize with openSSL, but the Java client throw an exception
of the bad encoded when read this.
Java have some functions to read PCS8 enconded key and x509 encoded key.

On the oder hand, I don't understand beccause I have allocate memory
in the second parameter of the function i2d_DSA_PUBKEY if this is a
pointer to pointer of the unsigned char threrefore the function can
allocate memory in the pointer else why the parameter is a double
pointer?

Thank you very much.

Here we have my source code.


bool writeFile( char *fileName, unsigned char *data, unsigned int len )
{
    FILE *file = fopen( fileName, "wb" );
    if( file == NULL )
        return false;

    int writtenBytes = 0;
    int totalWrittenBytes = 0;
    while( totalWrittenBytes < len )
    {
        writtenBytes = fwrite( &data[totalWrittenBytes], 
                                sizeof(unsigned char), 
                                len - totalWrittenBytes , 
                                file );
        totalWrittenBytes += writtenBytes;
    }
    
    fclose( file );

    return true;
    
}


int main( int argc, char **argv )
{
    DSA *dsa = DSA_new();

    unsigned char ucDSAParams[1024];

    // Seed the random number generator
    srand( time( NULL ) );
    do
    {
        for( int it = 0; it < 1024; it ++ )
            ucDSAParams[it] = rand() / RAND_MAX * 255;
        
        RAND_seed( ucDSAParams, 1024 );
    }while( !RAND_status() );
    
    while( !RAND_bytes( ucDSAParams, 1024 ) );

    //Generate DSA parameters
    dsa = DSA_generate_parameters( 1024, 
                                   ucDSAParams, 
                                   1024, 
                                   NULL, 
                                   NULL, 
                                   NULL, 
                                   NULL );
    if( !DSA_generate_key( dsa ) )
    {
        std::cout << "DSA_generate_key(..) error." << std::endl;
        return -1;
    }

 
    unsigned char *pubKeyInterchange = new unsigned char[1024];
    int pubKeyInchgSize = 0;
    pubKeyInchgSize = i2d_DSA_PUBKEY( dsa, &pubKeyInterchange );

    if( !writeFile( "pubkey.txt", pubKeyInterchange, pubKeyInchgSize ) )
    {
        std::cout << "writeFile( .. ) error" << std::endl;
        return -8;
    }


    DSA_free( dsa );
    return 1;

}
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