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Start refactoring hashing.

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This commit moves some of the hash datastructures and code from
util.cc into Hash.cc - where it seems more appropriate.

It also starts to make more Keyed hash functions available - still
using siphash as the default 64 bit keyed hash, but also making
128 and 256 bit highway hashes available.

There already are a few other functions that are defined but not
yet implemented - these will be "static" keyed hashes - which use
an installation specific key. These will be used to, e.g., get
rid of md5 hashing for the generation of file UIDs.
This commit is contained in:
Johanna Amann 2020-04-24 17:11:16 -07:00
parent d34532f847
commit 360c06a3f8
7 changed files with 123 additions and 67 deletions
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6
src/util.h
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@ -25,7 +25,6 @@
#include <stdarg.h>
#include <libgen.h>
#include <memory> // std::unique_ptr
#include "highwayhash/sip_hash.h"
#include "zeek-config.h"
@ -200,11 +199,6 @@ extern std::string strreplace(const std::string& s, const std::string& o, const
// Remove all leading and trailing white space from string.
extern std::string strstrip(std::string s);
extern bool hmac_key_set;
extern uint8_t shared_hmac_md5_key[16];
extern bool siphash_key_set;
extern highwayhash::HH_U64 shared_siphash_key[2];
extern void hmac_md5(size_t size, const unsigned char* bytes,
unsigned char digest[16]);