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PKCS #11 supports zero-length attributes (eg, CKA_LABEL) so hack of
using zero length attribute as NIL value won't work, instead we use a
slightly more portable version of the hack PKCS #11 uses (PKCS #11
stuffs -1 into a CK_ULONG, we stuff 0xFFFFFFFF into a uint32_t).
ks_attribute.c code was trying too hard and tripping over its own
socks. Instead of trying to maintain attributes[] in place during
modification, we now perform the minimum necessary change then re-scan
the block. This is (very slightly) slower but more robust, both
because the scan code has better error checking and because it's the
scan code that we want to be sure is happy before committing a change.
Rename hal_rpc_pkey_attribute_t to hal_pkey_attribute_t.
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Passes minimal unit-testing and the same minimal tests report that it
does deliver the desired performance speed-up. More testing and much
cleanup still needed.
Attribute API not quite stable yet, we're probably going to want to
remove all the singleton attribute operations from the RPC protocol,
and it turns out that ks_delete_attributes() has enough code in common
with ks_set_attributes() that it makes more sense to handle the former
as a special case of the latter.
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Passes PKCS #11 "make test" but nothing uses the new attribute code yet.
Refactored some of the flash block update code.
Attribute code is annoyingly verbose, might be possible to refactor
some of that.
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This is mostly to archive a commit where PKCS #11 "make test" still
works after converting the ks_volatile code to use SDRAM allocated at
startup instead of (large) static variables.
The attribute code itself is incomplete at this point.
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