Base64 BIO bug

[Sellitto Gianluigi]

I have de following code:

class CBase64
{
public:
    int encode(unsigned char* aPlain,char** aOut,int aInlen);
    int decode(char* aPlain, std::string& strout);
};

int CBase64::encode(unsigned char* aPlain,char** aOut,int aInlen) 
{
    int i;
    BIO *mbio,*b64bio,*bio;
    char* p=(char*)NULL;

    mbio=BIO_new(BIO_s_mem());
    b64bio=BIO_new(BIO_f_base64());
    
    //BIO_set_flags(b64bio,BIO_FLAGS_BASE64_NO_NL);

    bio=BIO_push(b64bio,mbio);
    BIO_write(bio,aPlain,aInlen);
    BIO_flush(bio);


    i=(int)BIO_ctrl(mbio,BIO_CTRL_INFO,0,(char *)&p);

    if(i>0) {
    *aOut=(char*)malloc(i);
    memcpy(*aOut,p,i);
    }

    BIO_free_all(bio);
    return i;
}

int CBase64::decode(char* aPlain, std::string& strout) 
{
    int i;
    BIO *mbio,*b64bio,*bio;
    unsigned char *buf;

    mbio=BIO_new(BIO_s_mem());
    b64bio=BIO_new(BIO_f_base64());


    //BIO_set_flags(b64bio,BIO_FLAGS_BASE64_NO_NL);
    BIO_puts(mbio,aPlain);
    BIO_flush(mbio);

    bio=BIO_push(b64bio,mbio);

    size_t t= BIO_ctrl_pending(bio);
    buf = (unsigned char*)malloc(t);
    i=BIO_read(bio, (void*)buf, t);
    if(i>0) 
    {
        strout.append((char*)buf,i);
    }

    BIO_free_all(bio);
    return i;
}

int main(int argc, char* argv[])
{
    
    // this is just a sample
    int n=1000;
    std::string str(n,'w');
             
    CBase64 b;
    char* out=0;
    b.encode((unsigned char*)str.c_str(),&out,str.length());

    std::string strout;
    b.decode(out,strout);


        return 0;
}


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