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2018-02-27Clean up RPC code, track changes to XDR API.Paul Selkirk
2018-02-27Refactor XDR code, add support for fixed-length opaque data.Paul Selkirk
2018-01-04Add hal_core_alloc2() to fix a dining philosophers problem in hal_modexp2().Paul Selkirk
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.
2017-12-13Merge branch systolic_crt into master.Rob Austein
This branch was sitting for long enough that master had been through a cleanup pass, so beware of accidental reversions.
2017-10-27~0 is actually more correct, or more portablePaul Selkirk
2017-10-23Cleanup signed/unsigned mismatches, mostly in loop countersPaul Selkirk
2017-10-15Correctly mark "unsecure" KEK as erased.Paul Selkirk
2017-10-15Cleanup: keystore driver functions return HAL_StatusTypeDef instead of magic ↵Paul Selkirk
values.
2017-10-11Cleanup: Remove "const" qualifiers from function return types.Paul Selkirk
2017-09-154096-bit RSA keys working again, with 8k keystore "blocks".Rob Austein
2017-09-13Oops, forgot hal_io.c.Rob Austein
2017-09-13Preliminary support for parallel core RSA CRT.Rob Austein
2017-09-13Sort-of-working, large (4096-bit) RSA keys broken.Rob Austein
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.
2017-09-12Silly macro bugs.Rob Austein
2017-09-12Untested ASN.1 support for ModExpA7 private speedup factors.Rob Austein
2017-09-11Reverse the polarity of the neutron flowRob Austein
2017-09-09Far too much fun with modexpa7 operand lengths and locations.Rob Austein
2017-09-09Whack with club until compiles.Rob Austein
2017-09-09Start hacking for systolic modexp.Rob Austein
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.
2017-07-31Unconditionally set the allocated flag when initializing a hash statePaul Selkirk
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.
2017-07-24Split compile-time control of RSA ModExp.Rob Austein
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.
2017-07-24Use ModExp fast mode for Miller-Rabin tests.Rob Austein
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.
2017-07-03Fencepost error (1-based counting using xrange(), sigh).Rob Austein
2017-06-27Key generation timing.Rob Austein
Initial version, very basic, RSA-only. Gussy up later.
2017-06-14Tidy up new prime generation code.Rob Austein
2017-06-14Faster prime generation algorithm for RSA.Rob Austein
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.
2017-06-11Flesh out digest and HMAC tests.Rob Austein
2017-06-11None is more Pythonic than "" as indicator for "no key"Rob Austein
2017-06-08Merge branch 'ks9'Rob Austein
2017-06-08Document the keystore design.Rob Austein
2017-06-04Include file dependencies were badly out of date.Rob Austein
2017-06-04Tweak CRC input to be backwards compatabile with ksng.Rob Austein
Except for torture tests, we never really used the hideously complex multi-block capabilities of the ksng version of the flash keystore, among other reasons because the only keys large enough to trigger the multi-block code were slow enough to constitute torture on their own. So we can preserve backwards compatabliity simply by including the former *chunk fields (renamed legacy* here) in the CRC and checking for the expected single-block key values. We probably want to include everything in the CRC in any case except when there's an explicit reason omit something, so, this is cheap, just a bit obscure. At some point in the future we can phase out support for the backwards compatible values, but there's no particular hurry about it unless we want to reuse those fields for some other purpose.
2017-06-03Add --soft-backup option to cryptech_backup.Rob Austein
cryptech_backup is designed to help the user transfer keys from one Cryptech HSM to another, but what is is a user who has no second HSM supposed to do for backup? The --soft-backup option enables a mode in which cryptech_backup generates its own KEKEK instead of getting one from the (nonexistent) target HSM. We make a best-effort attempt to keep this soft KEKEK secure, by wrapping it with a symmetric key derived from a passphrase, using AESKeyWrapWithPadding and PBKDF2, but there's a limit to what a software-only solution can do here. The --soft-backup code depends (heavily) on PyCrypto.
2017-06-03Add --soft-backup option to cryptech_backup.Rob Austein
cryptech_backup is designed to help the user transfer keys from one Cryptech HSM to another, but what is is a user who has no second HSM supposed to do for backup? The --soft-backup option enables a mode in which cryptech_backup generates its own KEKEK instead of getting one from the (nonexistent) target HSM. We make a best-effort attempt to keep this soft KEKEK secure, by wrapping it with a symmetric key derived from a passphrase, using AESKeyWrapWithPadding and PBKDF2, but there's a limit to what a software-only solution can do here. The --soft-backup code depends (heavily) on PyCrypto.
2017-06-02Fix AESKeywrapWithPadding handling of very long messages.Rob Austein
We were XORing the low 32 bits of R[0] instead of the full 64 bits. Makes no difference for small values of n, so we never detected it.
2017-05-31Automatic logout when client disconnects or muxd restarts.Rob Austein
The HSM itself should be detecting carrier drop on its RPC port, but I haven't figured out where the DCD bit is hiding in the STM32 UART API, and the muxd has to be involved in this in any case, since only the muxd knows when an individual client connection has dropped. So, for the moment, we handle all of this in the muxd.
2017-05-30Hold keystore lock before calling keystore driver methods.Rob Austein
Most keystore methods already followed this rule, but hal_ks_*_init() and hal_ks_*_logout() were confused, in different ways.
2017-05-30Missed one instance of one API change in "logout" branch merge.Rob Austein
2017-05-30Merge branch 'logout' into ks9Rob Austein
The internal keystore API has changed enough since where the "logout" branch forked that a plain merge would have no prayer of compiling, must less running. So this merge goes well beyond manual conflict resolution: it salvages the useful code from the "logout" branch, with additional code as needed to reimplement the functionality. Sorry.
2017-05-29Adjust "bloat" unit tests for ks9 keystore parameters.Rob Austein
2017-05-29Missed a few references to old pkey_slot field names, oops.Rob Austein
2017-05-29Simplify per-session keys.Rob Austein
Cosmetic cleanup of pkey_slot along the way.
2017-05-29Indentation.Rob Austein
2017-05-29Debug per-session keys.Rob Austein
2017-05-28Debug new keystore init code.Rob Austein
2017-05-28Almost compiles.Rob Austein
Need to refactor init sequence slightly (again), this time to humor the bootloader, which has its own special read-only view of the PIN block in the token keystore.
2017-05-28Further keystore cleanup and consolidation.Rob Austein
Still not yet expected to compile, much less run, but getting closer.
2017-05-25Add task_yield_maybePaul Selkirk
2017-05-25Checkpoint while refactoring. Almost certainly will not compile.Rob Austein
2017-05-25Fix up ks driver calls and inline wrappers.Rob Austein