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Now that we use PKCS #8 format for private keys, all key formats we
use include ASN.1 AlgorithmIdentifier field describing the key, so
specifying key type and curve as arguments to hal_rpc_pkey_load() is
neither necessary nor particularly useful.
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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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pkey attribute API is now just set_attributes() and get_attributes().
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hal_rpc_pkey_match() still untested.
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Fixes for various minor issues found while integrating with sw/stm32.
Moving the in-memory keystore (PKCS #11 session objects, etc) from the
client library to the HSM was on the near term to-do list in any case,
doing it now turned out to be the easiest way to solve one of the
build problems.
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silliness, with a bit of PKCS #1.5 padding silliness for desert.
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only, requires AES core (for key wrapping).
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