[master] Honor OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT as set and default to UNCOMPRESSED #19781
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…o UNCOMPRESSED Originally the code to im/export the EC pubkey was meant to be consumed only by the im/export functions when crossing the provider boundary. Having our providers exporting to a COMPRESSED format octet string made sense to avoid memory waste, as it wasn't exposed outside the provider API, and providers had all tools available to convert across the three formats. Later on, with openssl#13139 deprecating the `EC_KEY_*` functions, more state was added among the params imported/exported on an EC provider-native key (including `OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT`, although it did not affect the format used to export `OSSL_PKEY_PARAM_PUB_KEY`). Finally, in openssl#14800, `EVP_PKEY_todata()` was introduced and prominently exposed directly to users outside the provider API, and the choice of COMPRESSED over UNCOMPRESSED as the default became less sensible in light of usability, given the latter is more often needed by applications and protocols. This commit fixes it, by using `EC_KEY_get_conv_form()` to get the point format from the internal state (an `EC_KEY` under the hood) of the provider-side object, and using it on `EVP_PKEY_export()`/`EVP_PKEY_todata()` to format `OSSL_PKEY_PARAM_PUB_KEY`. The default for an `EC_KEY` was already UNCOMPRESSED, and it is altered if the user sets `OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT` via `EVP_PKEY_fromdata()`, `EVP_PKEY_set_params()`, or one of the more specialized methods. For symmetry, this commit also alters `ec_pkey_export_to()` in `crypto/ec/ec_ameth.c`, part of the `EVP_PKEY_ASN1_METHOD` for legacy EC keys: it exclusively used COMPRESSED format, and now it honors the conversion format specified in the EC_KEY object being exported to a provider when this function is called. Fixes openssl#16595
…fault to UNCOMPRESSED Expand documentation about `OSSL_PKEY_PARAM_PUB_KEY` and mention the 3.1 change in behavior for our providers.
…fault to UNCOMPRESSED Add a CHANGES entry
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Once 3.1 is released we will update CHANGES.md in master to include the 3.1 changes entries. So this one will be removed from the 3.2 section. But that does not matter for now. |
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Nov 28, 2022
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The 3.1 PR cherry-picked cleanly to master so I am closing this. |
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This ports #19681 to
master.They differ exclusively for the CHANGES.md (same entry text, different position): in
masterwe describe directly the differences from 3.0 to 3.2, skipping 3.1 altogether.Fixes #16595
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