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premature optimization.
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Copy ContextManagedUnpacker from latest version of libhal.py so that
this script won't depend on the current development code.
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At the moment this only handles RSA keys, and can only handle one size
of key at a time. More bells and whistles will follow eventually,
now that the basic asynchronous API to our RPC protocol works.
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Failing to clear the temporary buffer used to transfer bits from the
TRNG into a bignum was a real leak of something very close to keying
material, albeit only onto the local stack where it was almost certain
to have been overwritten by subsequent operations (generation of other
key components, wrap and PKCS #8 encoding) before pkey_generate_rsa()
ever returned to its caller. Still, bad coder, no biscuit.
Failing to clear the remainders array was probably harmless, but
doctrine says clear it anyway.
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contextlib is cute, but incompatible with other coroutine schemes like
Tornado, so just write our own context manager for xdrlib.Unpacker.
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add ability to export public key to xdr for interop testing
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premature optimization.
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Uncoordinated attempts to allocate two modexpa7 cores leads to deadlock if
multiple clients try to do concurrent RSA signing operations.
The simplest solution (back off and retry) could theoretically lead to
resource starvation, but we haven't seen it in actual testing.
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This branch was sitting for long enough that master had been through a
cleanup pass, so beware of accidental reversions.
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values.
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Snapshot of mostly but not entirely working code to include the extra
ModExpA7 key components in the keystore. Need to investigate whether
a more compact representation is practical for these components, as
the current one bloats the key object so much that a bare 4096-bit key
won't fit in a single hash block, and there may not be enough room for
PKCS #11 attributes even for smaller keys.
If more compact representation not possible or insufficient, the other
option is to double the size of a keystore object, making it two flash
subsectors for a total of 8192 octets. Which would of course halve
the number of keys we can store and require a bunch of little tweaks
all through the ks code (particularly flash erase), so definitely
worth trying for a more compact representation first.
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Work in progress. Probably won't even compile, much less run.
Requires corresponding new core/math/modexpa7 core.
No support (yet) for ASN.1 encoding of speedup factors or storage of
same in keystore.
No support (yet) for running CRT algorithm in parallel cores.
Minor cleanup of ancient bus I/O code, including EIM and I2C bus code
we'll probably never use again.
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structure.
When running multiple concurrent unit tests, I observed multiple failures
in the hmac tests, which I ultimately tracked down to different clients
sharing the same hal_hmac_state struct.
hal_hash_initialize is called twice in hal_hmac_initialize (once to get
the state structure, then again if the supplied key is too long), and is
called in hal_hmac_finalize, to hash the digest with the supplied key. In
these subsequent cases, the caller supplies the state structure, which
hal_hash_initialize zeroes, but it doesn't set the allocated flag. This
marks an in-use struct as available, so it gets reassigned and
reinitialized, and Bad Things Happen for both clients that are trying to
use it.
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At least for now, the speed tradeoff between software ModExp and our
Verilog ModExp core differs significantly between signature and key
generation. We don't really know why, but since key generation does
not need to be constant time, we split out control over whether to use
the software or FPGA implementation, so that we can use the FPGA for
signature while using software for key generation.
Revisit this if and when we figure out what the bottleneck is, as well
as any time that the FPGA core itself changes significantly.
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Trying to make RSA key generation run in constant time is probably
both futile and unnecessary, so we can speed it up a bit by switching
the ModExpA7 core to use "fast" mode rather than "constant time" mode.
Sadly, while this change produces a measureable improvement, it
doesn't bring FGPA ModExp anywhere near the speed of the software
equivalent in this case. Don't really know why.
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Initial version, very basic, RSA-only. Gussy up later.
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Algorithm suggested by a note in Handbook of Applied Cryptography,
motivated by profiling of libtfm fp_isprime() function showing
something close to 50% of CPU time spent running Montgomery reductions
in the small primes test, before we even get to Miller-Rabin.
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