new

static VALUE
ossl_rsa_initialize(int argc, VALUE *argv, VALUE self)
{
    EVP_PKEY *pkey;
    RSA *rsa;
    BIO *in;
    char *passwd = NULL;
    VALUE arg, pass;
        
    GetPKey(self, pkey);
    if(rb_scan_args(argc, argv, "02", &arg, &pass) == 0) {
        rsa = RSA_new();
    }
    else if (FIXNUM_P(arg)) {
        rsa = rsa_generate(FIX2INT(arg), NIL_P(pass) ? RSA_F4 : NUM2INT(pass));
        if (!rsa) ossl_raise(eRSAError, NULL);
    }
    else {
        if (!NIL_P(pass)) passwd = StringValuePtr(pass);
        arg = ossl_to_der_if_possible(arg);
        in = ossl_obj2bio(arg);
        rsa = PEM_read_bio_RSAPrivateKey(in, NULL, ossl_pem_passwd_cb, passwd);
        if (!rsa) {
            (void)BIO_reset(in);
            rsa = PEM_read_bio_RSAPublicKey(in, NULL, NULL, NULL);
        }
        if (!rsa) {
            (void)BIO_reset(in);
            rsa = PEM_read_bio_RSA_PUBKEY(in, NULL, NULL, NULL);
        }
        if (!rsa) {
            (void)BIO_reset(in);
            rsa = d2i_RSAPrivateKey_bio(in, NULL);
        }
        if (!rsa) {
            (void)BIO_reset(in);
            rsa = d2i_RSAPublicKey_bio(in, NULL);
        }
        if (!rsa) {
            (void)BIO_reset(in);
            rsa = d2i_RSA_PUBKEY_bio(in, NULL);
        }
        BIO_free(in);
        if (!rsa) ossl_raise(eRSAError, "Neither PUB key nor PRIV key:");
    }
    if (!EVP_PKEY_assign_RSA(pkey, rsa)) {
        RSA_free(rsa);
        ossl_raise(eRSAError, NULL);
    }

    return self;
}