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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2017-06-04Include file dependencies were badly out of date.Rob Austein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
2017-05-24Type name cleanup, key visibility.Rob Austein
2017-05-24Checkpoint, not expected to work yet, includes a lot of notes.Rob Austein
2017-05-23Goodbye ancient mmap()-based keystore.Rob Austein
The Novena-era mmap()-based keystore is far enough out of date that it's not worth maintaining (and we haven't been doing so): if we ever need one again, it would be easier to rewrite it from scratch.
2017-05-23Merge branch 'master' into ks9Rob Austein
2017-05-23"core" arguments have not been const since we switched to core_selector.Rob Austein
2017-05-23Whack previous commit with club until it compiles.Rob Austein
2017-05-22First pass on experimental one-size-fits-nobody keystore.Rob Austein
Support for variable-length keystore objects significantly complicates the keystore implementation, including serious some serious code bloat and a complex recovery algorithm to deal with crashes or loss of power at exactly the wrong time. Perhaps we don't really need this? So this is an experiment to see whether we can replace variable-length keystore objects with fixed-length, perhaps with a compile time option to let us make the fixed object length be 8192 bytes instead of 4096 bytes when needed to hold things like large RSA keys. First pass on this is just throwing away nearly 1,000 lines of excessively complex code. The result probably won't even compile yet, but it's already significantly easier to read.
2017-05-18Re-enable FPGA modexp.Rob Austein
2017-05-17Free modexp core after using it.Rob Austein
2017-05-17No, children, you can't || enum error codes. Again.Rob Austein
2017-05-11TestPKeyMatch was a little sloppy when counting keys.Rob Austein
2017-05-10Work around known bugs in PyCrypto ASN.1 code.Rob Austein
Turns out there are a couple of known minor bugs in PyCrypto's ASN.1 decoder, simple dumb things that never could have worked. Debian's packaging includes a patch for these bugs, but for some reason the patch is marked as not needing to be sent upstream, dunno why. So these methods work fine, but only on Debian. Feh. Simplest approach is to work around the bugs on all platforms, particularly given that this is just unit test support code.
2017-05-09Update README.md.Rob Austein
2017-05-04hal_rpc_pkey_match() works better with response buffer sized correctly.Rob Austein
2017-05-03Tweak PySerial write_timeout setting.Rob Austein
2017-04-30Merge branch 'ksng' into no-rtosRob Austein
2017-04-27Decorator doesn't work properly with --all-tests, use runtime check.Rob Austein
2017-04-26Lower PBKDF2 password iterations and add delay on bad PIN.Rob Austein
Consistent user complaints about HSM login taking too long. Underlying issue has both superficial and fundamental causes. Superficial: Our PBKDF2 implementation is slow. We could almost certainly make it faster by taking advantage of partial pre-calculation (see notes in code) and by reenabling use of FPGA hash cores when when checking passwords (which mgiht require linking the bootloader against a separate libhal build to avoid chicken-and-egg problem of needing FPGA to log into console to configure FPGA). Fundamental: The PBKDF2 iteration counts we used to use (10,000 minimum, 20,000 default) are in line with current NIST recommendations. The new, faster values (1,000 and 2,000, respectively) are not, or, rather, they're in line with what NIST recommended a decade ago. Well, OK, maybe the Coretex M4 is so slow that it's living in the past, but still. The fundamental issue is that anybody who can capture the encoded PIN can mount an offline dictionary attack on it, so we'd like to make that expensive. But the users are unhappy with the current behavior, so this change falls back to the ancient technique of adding a delay (currently five seconds, configurable at compile time) after a bad PIN, which makes it painful to use the login function as an oracle but does nothing about the offline dictionary attack problem. Feh. Note that users can still choose a higher iteration count, by setting the iteration count via the console. It's just not the default out of the box anymore.
2017-04-26Don't intefere with sys.exit().Rob Austein
2017-04-25adapt to the new experimental tasking systemPaul Selkirk
2017-04-25Shake dumb compile-time bugs out of new logout code.Rob Austein
What I get for writing code while build and test environment is tied up with a multi-day run testing something else.
2017-04-24Call a portable entrenching tool a portable entrenching tool.Rob Austein
2017-04-24Clean up pkey slots and volatile keys on client logout.Rob Austein
2017-04-23Wrap keyslot clearing in a critical section.Rob Austein
I doubt this change will have any noticable effect, but it's another theoretical race condition, might as well eliminate it.
2017-04-23Avoid deadlock triggered by low-probability race condition.Rob Austein
Static code analysis (Doxygen call graph) detected a low-probability race condition which could have triggered a deadlock on the keystore mutex if the mkmif code returns with an error like HAL_ERROR_CORE_BUSY when we're trying to fetch the KEK. This is a knock-on effect of the awful kludge of backing up the KEK in the keystore flash as an alternative to powering the MKM with a battery as called for in the design. This code path should not exist at all, but, for now, we avoid the deadlock by making it the caller's responsibility to grab the keystore mutex before looking up the KEK.