to_der() public

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static VALUE
ossl_rsa_to_der(VALUE self)
{
    EVP_PKEY *pkey;
    int (*i2d_func)_((const RSA*, unsigned char**));
    unsigned char *p;
    long len;
    VALUE str;

    GetPKeyRSA(self, pkey);
    if(RSA_HAS_PRIVATE(pkey->pkey.rsa))
        i2d_func = i2d_RSAPrivateKey;
    else
        i2d_func = i2d_RSAPublicKey;
    if((len = i2d_func(pkey->pkey.rsa, NULL)) <= 0)
        ossl_raise(eRSAError, NULL);
    str = rb_str_new(0, len);
    p = (unsigned char *)RSTRING_PTR(str);
    if(i2d_func(pkey->pkey.rsa, &p) < 0)
        ossl_raise(eRSAError, NULL);
    ossl_str_adjust(str, p);

    return str;
}
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