OpenSSL::X509::Certificate#tbs_bytes

static VALUE
ossl_x509_tbs_bytes(VALUE self)
{
    X509 *x509;
    int len;
    unsigned char *p0;
    VALUE str;

    GetX509(self, x509);
    len = i2d_re_X509_tbs(x509, NULL);
    if (len <= 0) {
        ossl_raise(eX509CertError, "i2d_re_X509_tbs");
    }
    str = rb_str_new(NULL, len);
    p0 = (unsigned char *)RSTRING_PTR(str);
    if (i2d_re_X509_tbs(x509, &p0) <= 0) {
        ossl_raise(eX509CertError, "i2d_re_X509_tbs");
    }
    ossl_str_adjust(str, p0);

    return str;
}