Hi,
Today we are switching our branches around, so that the development branch focuses on Mbed TLS 3.0, to be released mid-year. This will include API-breaking changes.
2.x development work will continue on the development_2.x branch. After merging development_3.0 onto development, the development_3.0 branch will be removed.
There is no change to the process for submitting PRs: new PRs should continue to target development, with backports to 2.x and 2.16 as needed. (The exception would be a bug-fix that only affects older branches, which would only need ports to the affected branches and not to development).
As part of the 3.0 work, we are looking at various things that can be removed from the library. For some of these, we’ve notified the mailing list – please let us know in the next week if you have a good reason for retaining the feature in question.
- Remove support for TLS 1.0, TLS 1.1 and DTLS 1.0 https://github.com/ARMmbed/mbedtls/issues/4286
- Remove support for the "Truncated HMAC" (D)TLS extension https://github.com/ARMmbed/mbedtls/issues/4341
- Remove support for 3DES ciphersuites in (D)TLS https://github.com/ARMmbed/mbedtls/issues/4367
- Remove support for RC4, Blowfish, XTEA, MD2 and MD4 https://github.com/ARMmbed/mbedtls/issues/4084
- Remove support for pre-v3 X.509 certificates with extensions https://github.com/ARMmbed/mbedtls/issues/4386
- Remove the RSA key mutex https://github.com/ARMmbed/mbedtls/issues/4124
- Remove MBEDTLS_CHECK_PARAMS https://github.com/ARMmbed/mbedtls/issues/4313
- 3.0 and 2.x :- Minimum development environment: is it OK to require Python >= 3.6 and/or CMake >= 3.5.2? https://lists.trustedfirmware.org/pipermail/mbed-tls/2021-March/000319.html
Dave Rodgman
Hello Mbed TLS users,
As previously announced, we are going to switch the focus of Mbed TLS development onto the upcoming 3.0 release.
* We have created the development_2.x branch, currently aligned with the tip of development
* For the next two weeks, we will keep development and development_2.x in sync (daily)
* On April 22, we will merge development_3.0 into development, and remove development_3.0
This means that after April 22:
* development will contain API-breaking changes
* new features will not normally be back-ported to development_2.x (unless there is a compelling reason to do so)
* relevant bugfixes will be backported as normal
Impact for users:
* users of development should consider whether they should switch to using development_2.x
* authors of PRs requiring backports may require an additional backport to development_2.x
Regards
Dave Rodgman
Hello,
We've now created the branch to allow Mbed TLS 3.0 development to begin.
Mbed TLS 3.0 development will take place on development_3.0 in the short term. Mbed TLS 2.x development will continue on development. We'll regularly merge changes to development into development_3.0 so that they stay aligned.
At the point of the release of Mbed TLS 2.26, we will rename development to become mbedtls-2.26 and rename development_3.0 to become development, so that the focus for new work becomes the upcoming Mbed TLS 3.0 release.
Regards,
Dave Rodgman
On 17/12/2020, 10:04, "Mbed-tls-announce on behalf of Dave Rodgman via Mbed-tls-announce" <mbed-tls-announce-bounces(a)lists.trustedfirmware.org on behalf of Mbed-tls-announce(a)lists.trustedfirmware.org> wrote:
Hello,
We are planning to release Mbed TLS 3.0 around June 2021, alongside an LTS release of Mbed TLS 2.x. Our major version numbers indicate API breaking changes, and this is no exception: Mbed TLS 3.0 will have changes that make it incompatible with 2.x (as an obvious example, functions that are deprecated in 2.x will be removed).
In setting a near-term release date, we have chosen some key areas that we want to focus on for 3.0. Some other API-breaking items (i.e., those requiring significant design time) won't make the cut and we will hold those back for a future major version, in order to have time to get them right. The main focus for 3.0 will be reduction in API surface, and changes that are low-impact for almost everyone.
Work towards 3.0 will start in late January, on the development branch which will contain a public work-in-progress view of Mbed TLS 3.0. Any work for 2.x in this timeframe will take place on a separate branch (provisionally named like "mbedtls-2.x").
During the 3.0 development period, bug fixes and security fixes will continue to be a priority, but we will have slightly less capacity for other features. While 3.0 is in development, any new features will by default be landed in 3.0 only, unless there is a strong case for back-porting to 2.x. The 2.x LTS branches will still be supported with bug fixes and security fixes for the normal three year lifetime (i.e., the final LTS release of 2.x in mid-2021 will be supported until mid-2024).
In terms of content, we are taking a cautious approach to what we plan for 3.0. In the past we've been ambitious here and as a result, have slipped on the release date; by being cautious on feature set we can be confident about hitting the mid-year release date. We won't try to make all of the changes that would be nice-to-have; instead, we will focus on tasks that reduce maintenance, unlock other improvements in a 3.x timeframe, are still valuable if only partially completed, and can fit within this time frame. Currently we're looking at the following areas for 3.0:
* Reduce the public surface of the API
* Clean-up existing APIs
* Changes to default options
Regards
Dave Rodgman
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This is a notice that Mbed TLS 2.7 will no longer be supported or maintained after February 5th 2021. Mbed TLS 2.7.0 was released on February 5th 2018 with a three year support period.
The current version of Mbed TLS 2.7 is 2.7.18, which was released on December 11th 2020. There are no pending bug or security fixes, so unless new issues arise during the next month, there will not be another release of 2.7. We do not plan to merge any non-critical backports to 2.7 in the next month.
We recommend that where practical, users upgrade to either 2.16, which will be supported until the end of 2021, or to the development branch, which will be released as an LTS in mid 2021, with an expected support period until mid 2024.
Dave Rodgman
Hello,
We are planning to release Mbed TLS 3.0 around June 2021, alongside an LTS release of Mbed TLS 2.x. Our major version numbers indicate API breaking changes, and this is no exception: Mbed TLS 3.0 will have changes that make it incompatible with 2.x (as an obvious example, functions that are deprecated in 2.x will be removed).
In setting a near-term release date, we have chosen some key areas that we want to focus on for 3.0. Some other API-breaking items (i.e., those requiring significant design time) won't make the cut and we will hold those back for a future major version, in order to have time to get them right. The main focus for 3.0 will be reduction in API surface, and changes that are low-impact for almost everyone.
Work towards 3.0 will start in late January, on the development branch which will contain a public work-in-progress view of Mbed TLS 3.0. Any work for 2.x in this timeframe will take place on a separate branch (provisionally named like "mbedtls-2.x").
During the 3.0 development period, bug fixes and security fixes will continue to be a priority, but we will have slightly less capacity for other features. While 3.0 is in development, any new features will by default be landed in 3.0 only, unless there is a strong case for back-porting to 2.x. The 2.x LTS branches will still be supported with bug fixes and security fixes for the normal three year lifetime (i.e., the final LTS release of 2.x in mid-2021 will be supported until mid-2024).
In terms of content, we are taking a cautious approach to what we plan for 3.0. In the past we've been ambitious here and as a result, have slipped on the release date; by being cautious on feature set we can be confident about hitting the mid-year release date. We won't try to make all of the changes that would be nice-to-have; instead, we will focus on tasks that reduce maintenance, unlock other improvements in a 3.x timeframe, are still valuable if only partially completed, and can fit within this time frame. Currently we're looking at the following areas for 3.0:
* Reduce the public surface of the API
* Clean-up existing APIs
* Changes to default options
Regards
Dave Rodgman
Mbed TLS version 2.24.0, 2.16.8 and 2.7.17 have been released recently. Version 2.7.17 is incorrectly marked as the latest release by github. Since this happens automatically based on the commit creation dates, this can’t be fixed until the next release.
We have extended the release notes of 2.7.17 to warn about this and changed the download links on the website.
We would like to confirm that version 2.24.0 is the latest release and the other two are the patch releases for the 2.16 and 2.7 long term support branches.
My apologies for the inconvenience and thank you for your support!
Best regards,
Janos
(On behalf of the Mbed TLS team)
