value=

static VALUE
ossl_x509attr_set_value(VALUE self, VALUE value)
{
    X509_ATTRIBUTE *attr;
    ASN1_TYPE *a1type;

    if(!(a1type = ossl_asn1_get_asn1type(value)))
        ossl_raise(eASN1Error, "could not get ASN1_TYPE");
    if(ASN1_TYPE_get(a1type) == V_ASN1_SEQUENCE){
        ASN1_TYPE_free(a1type);
        ossl_raise(eASN1Error, "couldn't set SEQUENCE for attribute value.");
    }
    GetX509Attr(self, attr);
    if(attr->value.set){
        if(OSSL_X509ATTR_IS_SINGLE(attr)) ASN1_TYPE_free(attr->value.single);
        else sk_ASN1_TYPE_free(attr->value.set);
    }
    OSSL_X509ATTR_SET_SINGLE(attr);
    attr->value.single = a1type;

    return value;
}