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Make Salsa20 variable-round, allowing for Salsa20/12 to be used for Packet encrypt and decrypt. Profiling analysis found that Salsa20 encrypt was accounting for a nontrivial percentage of CPU time, so it makes sense to cut this load fundamentally. There are no published attacks against Salsa20/12, and DJB believes 20 rounds to be overkill. This should be more than enough for our needs. Obviously incorporating ASM Salsa20 is among the next steps for performance.

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Adam Ierymenko
2013-10-18 17:39:48 -04:00
parent 37e3bc3467
commit 8c9b73f67b
7 changed files with 41 additions and 14 deletions
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5
node/Identity.cpp
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@ -48,6 +48,9 @@
// Step distance for mixing genmem[]
#define ZT_IDENTITY_GEN_MEMORY_MIX_STEP 1024
// Rounds used for Salsa20 step
#define ZT_IDENTITY_GEN_SALSA20_ROUNDS 20
namespace ZeroTier {
// A memory-hard composition of SHA-512 and Salsa20 for hashcash hashing
@ -58,7 +61,7 @@ static inline void _computeMemoryHardHash(const void *publicKey,unsigned int pub
// Generate genmem[] bytes of Salsa20 key stream
memset(genmem,0,ZT_IDENTITY_GEN_MEMORY);
Salsa20 s20(digest,256,(char *)digest + 32);
Salsa20 s20(digest,256,(char *)digest + 32,ZT_IDENTITY_GEN_SALSA20_ROUNDS);
s20.encrypt(genmem,genmem,ZT_IDENTITY_GEN_MEMORY);
// Do something to genmem[] that iteratively makes every value