* hash: add chi-square (vs uniform) rz-hash plugin
Adds a chi-square goodness-of-fit (vs a uniform byte distribution)
statistic as an rz-hash plugin and the rz_hash_chisquare() API.
Unlike Shannon entropy, chi-square separates high-entropy data that is
truly uniform (encryption/CSPRNG, ~255) from high-entropy data that is
merely compressed or packed (much larger values), which is a common
question when triaging firmware blobs.
* hash: add index-of-coincidence rz-hash plugin
Adds the index of coincidence as an rz-hash plugin and the
rz_hash_ioc() API. IoC is ~1/256 for uniform data and markedly higher
for text, padding, single-byte-XOR'd data and repeating-key regions;
computed at several strides it is the Friedman/Kasiski test for a
repeating-XOR period.
* hash: add min-entropy rz-hash plugin
Adds min-entropy H_inf = -log2(max_i p_i) as an rz-hash plugin and the
rz_hash_min_entropy() API. This is the conservative worst-case entropy
used by NIST SP 800-90B: 8.0 for a uniform block, dropping as soon as a
single byte value dominates.
* hash: add serial-correlation rz-hash plugin
Adds the lag-1 serial correlation coefficient (with wrap-around, as in
the classic `ent` tool) as an rz-hash plugin and the
rz_hash_serial_correlation() API. Near 0 for compressed/encrypted data
but clearly non-zero for executable code, counters and gradients - the
order-aware axis that the histogram-only metrics cannot see.
---------
Co-authored-by: Anton Kochkov <anton.kochkov@gmail.com>
* Added authors and licenses and plugin access to crypto related files
* removed `rz_hash` and related files
* introduced `rz_msg_digest_*` with plugins
* updated all old methods with newer ones.
* added HMAC support to `rz-hash` (moved key option under `-K`)
* removed wrong algorithms on `woD`/`woE`
* fixed parity digest size
* fixed the behaviour on all hash functions
* added unit test for hash
* optimized code for HMAC key calculation
* removed hash legacy tests
