source: qca/trunk/examples/rsatest/rsatest.cpp@ 58

#include<qfile.h>
#include<qfileinfo.h>
#include"qca.h"
#include<stdio.h>

//#define USE_FILE

QCA::RSAKey readKeyFile(const QString &name)
{
        QCA::RSAKey k;
        QFile f(name);
        if(!f.open(IO_ReadOnly)) {
                printf("Unable to open %s\n", name.latin1());
                return k;
        }
        QByteArray der = f.readAll();
        f.close();
        printf("Read %s [%d bytes]\n", name.latin1(), der.size());

        if(!k.fromDER(der)) {
                printf("%s: Error importing DER format.\n", name.latin1());
                return k;
        }
        char *yes = "yes";
        char *no = "no";
        printf("Successfully imported %s (enc=%s, dec=%s)\n",
                name.latin1(),
                k.havePublic() ? yes : no,
                k.havePrivate() ? yes : no);

        printf("Converting to DER: %d bytes\n", k.toDER().size());
        printf("Converting to PEM:\n%s\n", k.toPEM().latin1());
        return k;
}

int main(int argc, char **argv)
{
        QCA::init();
        QCString cs = (argc >= 2) ? argv[1] : "hello";

        if(!QCA::isSupported(QCA::CAP_RSA))
                printf("RSA not supported!\n");
        else {
#ifdef USE_FILE
                QCA::RSAKey pubkey = readKeyFile("keypublic.der");
                if(pubkey.isNull())
                        return 1;
                QCA::RSAKey seckey = readKeyFile("keyprivate.der");
                if(seckey.isNull())
                        return 1;
#else
                QCA::RSAKey seckey = QCA::RSA::generateKey(1024);
                if(seckey.isNull())
                        return 1;
                QCA::RSAKey pubkey = seckey;
#endif
                // encrypt some data
                QByteArray a(cs.length());
                memcpy(a.data(), cs.data(), a.size());

                QCA::RSA op;
                op.setKey(pubkey);
                QByteArray result;
                if(!op.encrypt(a, &result)) {
                        printf("Error encrypting.\n");
                        return 1;
                }
                QString rstr = QCA::arrayToHex(result);
                printf(">rsa(\"%s\") = [%s]\n", cs.data(), rstr.latin1());

                // now decrypt it
                op.setKey(seckey);
                QByteArray dec;
                if(!op.decrypt(result, &dec)) {
                        printf("Error decrypting.\n");
                        return 1;
                }
                QCString dstr;
                dstr.resize(dec.size()+1);
                memcpy(dstr.data(), dec.data(), dec.size());
                printf("<rsa(\"%s\") = [%s]\n", rstr.latin1(), dstr.data());
        }

        return 0;
}