OpenSSL::PKCS7#add_recipient

static VALUE
ossl_pkcs7_add_recipient(VALUE self, VALUE recip)
{
    PKCS7 *pkcs7;
    PKCS7_RECIP_INFO *ri;

    ri = DupPKCS7RecipientPtr(recip); /* NEED TO DUP */
    GetPKCS7(self, pkcs7);
    if (!PKCS7_add_recipient_info(pkcs7, ri)) {
        PKCS7_RECIP_INFO_free(ri);
        ossl_raise(ePKCS7Error, "Could not add recipient.");
    }

    return self;
}