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Document necessary error code processing

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Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16187)
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Dmitry Belyavskiy 2021-07-30 16:03:55 +02:00 committed by Pauli
parent 6b9d3b7c5e
commit 6da0f27483
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doc/man7/migration_guide.pod
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@ -469,6 +469,18 @@ Remove your usage of the low level APIs. In this case you will need to rewrite y
=back
=head3 Error code changes
As OpenSSL 3.0 provides a brand new Encoder/Decoder mechanism for working with
widely used file formats, application code that checks for particular error
reason codes on key loading failures might need an update.
Password-protected keys may deserve special attention. If only some errors
are treated as an indicator that the user should be asked about the password again,
it's worth testing these scenarios and processing the newly relevant codes.
There may be more cases to treat specially, depending on the calling application code.
=head2 Upgrading from OpenSSL 1.0.2
Upgrading to OpenSSL 3.0 from OpenSSL 1.0.2 is likely to be significantly more