signed_time

static VALUE
ossl_pkcs7si_get_signed_time(VALUE self)
{
    PKCS7_SIGNER_INFO *p7si;
    ASN1_TYPE *asn1obj;

    GetPKCS7si(self, p7si);

    if (!(asn1obj = PKCS7_get_signed_attribute(p7si, NID_pkcs9_signingTime))) {
        ossl_raise(ePKCS7Error, NULL);
    }
    if (asn1obj->type == V_ASN1_UTCTIME) {
        return asn1time_to_time(asn1obj->value.utctime);
    }
    /*
     * OR
     * ossl_raise(ePKCS7Error, "...");
     * ?
     */

    return Qnil;
}