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Backward compatibility: the key store

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Promise that we will keep supporting existing key store formats, at least
until a major version comes along.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine 2022-06-20 18:48:52 +02:00
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@ -16,7 +16,7 @@ API compatibility in the `master` branch between major version changes. We
also maintain ABI compatibility within LTS branches; see the next section for also maintain ABI compatibility within LTS branches; see the next section for
details. details.
## Backwards Compatibility ## Backwards Compatibility for application code
We maintain API compatibility in released versions of Mbed TLS. If you have We maintain API compatibility in released versions of Mbed TLS. If you have
code that's working and secure with Mbed TLS x.y.z and does not rely on code that's working and secure with Mbed TLS x.y.z and does not rely on
@ -50,6 +50,19 @@ increase code size for a security fix.)
For contributors, see the [Backwards Compatibility section of For contributors, see the [Backwards Compatibility section of
CONTRIBUTING](CONTRIBUTING.md#backwards-compatibility). CONTRIBUTING](CONTRIBUTING.md#backwards-compatibility).
## Backward compatibility for the key store
We maintain backward compatibility with previous versions of versions of the
PSA Crypto persistent storage since Mbed TLS 2.25.0, provided that the
storage backend (PSA ITS implementation) is configured in a compatible way.
We intend to maintain this backward compatibilty throughout a major version
of Mbed TLS (for example, all Mbed TLS 3.y versions will be able to read
keys written under any Mbed TLS 3.x with x < y).
Mbed TLS 3.x can also read keys written by Mbed TLS 2.25.0 through 2.28.x
LTS, but future major version upgrades (for example from 2.28.x/3.x to 4.y)
may require the use of an upgrade tool.
## Current Branches ## Current Branches
The following branches are currently maintained: The following branches are currently maintained: