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Unroll Salsa20 fully for a little more speed (non-SSE now almost as fast as SSE)

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This commit is contained in:
Adam Ierymenko 2015-10-09 09:39:27 -07:00
parent 3fa6dd377f
commit 0c498556d5
7 changed files with 1131 additions and 178 deletions
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9
node/Identity.cpp
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@ -41,7 +41,6 @@
#define ZT_IDENTITY_GEN_HASHCASH_FIRST_BYTE_LESS_THAN 17
#define ZT_IDENTITY_GEN_MEMORY 2097152
#define ZT_IDENTITY_GEN_SALSA20_ROUNDS 20
namespace ZeroTier {
@ -55,8 +54,8 @@ static inline void _computeMemoryHardHash(const void *publicKey,unsigned int pub
// ordinary Salsa20 is randomly seekable. This is good for a cipher
// but is not what we want for sequential memory-harndess.
memset(genmem,0,ZT_IDENTITY_GEN_MEMORY);
Salsa20 s20(digest,256,(char *)digest + 32,ZT_IDENTITY_GEN_SALSA20_ROUNDS);
s20.encrypt((char *)genmem,(char *)genmem,64);
Salsa20 s20(digest,256,(char *)digest + 32);
s20.encrypt20((char *)genmem,(char *)genmem,64);
for(unsigned long i=64;i<ZT_IDENTITY_GEN_MEMORY;i+=64) {
unsigned long k = i - 64;
*((uint64_t *)((char *)genmem + i)) = *((uint64_t *)((char *)genmem + k));
@ -67,7 +66,7 @@ static inline void _computeMemoryHardHash(const void *publicKey,unsigned int pub
*((uint64_t *)((char *)genmem + i + 40)) = *((uint64_t *)((char *)genmem + k + 40));
*((uint64_t *)((char *)genmem + i + 48)) = *((uint64_t *)((char *)genmem + k + 48));
*((uint64_t *)((char *)genmem + i + 56)) = *((uint64_t *)((char *)genmem + k + 56));
s20.encrypt((char *)genmem + i,(char *)genmem + i,64);
s20.encrypt20((char *)genmem + i,(char *)genmem + i,64);
}
// Render final digest using genmem as a lookup table
@ -77,7 +76,7 @@ static inline void _computeMemoryHardHash(const void *publicKey,unsigned int pub
uint64_t tmp = ((uint64_t *)genmem)[idx2];
((uint64_t *)genmem)[idx2] = ((uint64_t *)digest)[idx1];
((uint64_t *)digest)[idx1] = tmp;
s20.encrypt(digest,digest,64);
s20.encrypt20(digest,digest,64);
}
}