How long Legacy providers supported?

Hubert Kario hkario at
Mon Jul 24 12:54:55 UTC 2023

The big problem is that the legacy algorithms may be necessary to access
offline backups. Data that may be 10, 15, 25 years old...
Similarly, you may have signatures made as long time ago, but by use of
timestamping (I suggest reading about archival variants of PAdES, CAdES,
or XAdES) it allows us to trust 1024 bit DSA signatures or 768 bit RSA
signatures, because we can be sure they were made in the middle of 1990's.

On Monday, 24 July 2023 09:59:20 CEST, Tomas Mraz wrote:
> If you're talking about the algorithms in the legacy provider (and not
> the deprecated legacy API support) then there are no definitive plans
> when algorithms that are placed in that provider will be removed
> completely.
> The legacy provider itself is not going away at all as more algorithms
> will be moved to it in future (I assume DSA and SHA1 would be one of
> those). However eventually some algorithms that are in it currently
> might be completely dropped.
> Every removals of algorithms provided by a particular provider (i.e.,
> default in case of migration of for example DSA to the legacy provider,
> or legacy in case we remove for example MD2 from it) can happen only on
> a major version boundary. So 4.0 would be the earliest possible time.
> However it does not mean that it must happen at 4.0 and not 5.0 or any
> time later.
> We also do not have any timeframe for the 4.0 release so the only
> answer I can give you is that the removals of existing legacy
> algorithms won't happen any time soon (like 1-2 years from now).
> Tomas Mraz, OpenSSL
> On Mon, 2023-07-24 at 12:47 +0530, Ishani wrote:
>> Hi ,
>>     I'm aware that in future legacy providers will not be supported
>> and we must plan to migrate .
>> but I would like to know how long Legacy providers will be supported ...

Hubert Kario
Principal Quality Engineer, RHEL Crypto team
Red Hat Czech s.r.o., Purkyňova 99/71, 612 45, Brno, Czech Republic

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