Cosmetic change on the conversion proc + keep a copy of keccak_tiny implementation as benchmark
This commit is contained in:
mratsim
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66d7fb6575
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@ -1,6 +1,6 @@
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# Nim Ethash
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[](https://travis-ci.org/status-im/nim-ethash)[](https://opensource.org/licenses/Apache-2.0) 
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[](https://travis-ci.org/status-im/nim-ethash)[](https://opensource.org/licenses/Apache-2.0) 
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A pure Nim implementation of Ethash, the Ethereum proof of work
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@ -0,0 +1,230 @@
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# Copyright (c) 2018 Status Research & Development GmbH
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# Distributed under the Apache v2 License (license terms are at http://www.apache.org/licenses/LICENSE-2.0).
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import math, endians,
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keccak_tiny
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import ../src/private/[primes, conversion, functional, intmath]
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import ../src/data_sizes
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# ###############################################################################
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# Definitions
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const
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REVISION* = 23 # Based on spec revision 23
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WORD_BYTES = 4 # bytes in word - in Nim we use 64 bits words # TODO check that
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DATASET_BYTES_INIT* = 2'u^30 # bytes in dataset at genesis
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DATASET_BYTES_GROWTH* = 2'u^23 # dataset growth per epoch
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CACHE_BYTES_INIT* = 2'u^24 # bytes in cache at genesis
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CACHE_BYTES_GROWTH* = 2'u^17 # cache growth per epoch
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CACHE_MULTIPLIER = 1024 # Size of the DAG relative to the cache
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EPOCH_LENGTH* = 30000 # blocks per epoch
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MIX_BYTES* = 128 # width of mix
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HASH_BYTES* = 64 # hash length in bytes
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DATASET_PARENTS* = 256 # number of parents of each dataset element
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CACHE_ROUNDS* = 3 # number of rounds in cache production
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ACCESSES* = 64 # number of accesses in hashimoto loop
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# ###############################################################################
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# Parameters
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proc get_cache_size*(block_number: uint): uint {.noSideEffect.}=
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result = CACHE_BYTES_INIT + CACHE_BYTES_GROWTH * (block_number div EPOCH_LENGTH)
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result -= HASH_BYTES
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while (let dm = divmod(result, HASH_BYTES);
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dm.rem == 0 and not dm.quot.isPrime):
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# In a static lang, checking that the result of a division is prime
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# Means checking that reminder == 0 and quotient is prime
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result -= 2 * HASH_BYTES
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proc get_data_size*(block_number: uint): uint {.noSideEffect.}=
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result = DATASET_BYTES_INIT + DATASET_BYTES_GROWTH * (block_number div EPOCH_LENGTH)
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result -= MIX_BYTES
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while (let dm = divmod(result, MIX_BYTES);
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dm.rem == 0 and not dm.quot.isPrime):
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result -= 2 * MIX_BYTES
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# ###############################################################################
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# Fetch from lookup tables of 2048 epochs of data sizes and cache sizes
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proc get_datasize_lut*(block_number: Natural): uint64 {.noSideEffect, inline.} =
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data_sizes[block_number div EPOCH_LENGTH]
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proc get_cachesize_lut*(block_number: Natural): uint64 {.noSideEffect, inline.} =
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cache_sizes[block_number div EPOCH_LENGTH]
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# ###############################################################################
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# Cache generation
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proc mkcache*(cache_size: uint64, seed: Hash[256]): seq[Hash[512]] {.noSideEffect.}=
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# Cache size
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let n = int(cache_size div HASH_BYTES)
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# Sequentially produce the initial dataset
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result = newSeq[Hash[512]](n)
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result[0] = keccak512 seed.data
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for i in 1 ..< n:
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result[i] = keccak512 result[i-1].data
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# Use a low-round version of randmemohash
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for _ in 0 ..< CACHE_ROUNDS:
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for i in 0 ..< n:
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let
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v = result[i].as_u32_words[0] mod n.uint32
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a = result[(i-1+n) mod n].data
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b = result[v.int].data
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result[i] = keccak512 zipMap(a, b, x xor y)
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# ###############################################################################
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# Data aggregation function
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const FNV_PRIME = 0x01000193
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proc fnv*[T: SomeUnsignedInt or Natural](v1, v2: T): uint32 {.inline, noSideEffect.}=
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# Original formula is ((v1 * FNV_PRIME) xor v2) mod 2^32
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# However contrary to Python and depending on the type T,
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# in Nim (v1 * FNV_PRIME) can overflow
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# We can't do 2^32 with an int (only 2^32-1)
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# and in general (a xor b) mod c != (a mod c) xor (b mod c)
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#
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# Thankfully
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# We know that:
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# - (a xor b) and c == (a and c) xor (b and c)
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# - for powers of 2: a mod 2^p == a and (2^p - 1)
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# - 2^32 - 1 == high(uint32)
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# So casting to uint32 should do the modulo and masking just fine
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(v1.uint32 * FNV_PRIME) xor v2.uint32
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# ###############################################################################
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# Full dataset calculation
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proc calc_dataset_item*(cache: seq[Hash[512]], i: Natural): Hash[512] {.noSideEffect, noInit.} =
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let n = cache.len
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const r: uint32 = HASH_BYTES div WORD_BYTES
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# Alias for the result value. Interpreted as an array of uint32 words
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var mix = cast[ptr array[16, uint32]](addr result)
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mix[] = cache[i mod n].as_u32_words
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when system.cpuEndian == littleEndian:
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mix[0] = mix[0] xor i.uint32
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else:
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mix[high(mix)] = mix[high(mix)] xor i.uint32
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result = keccak512 mix[]
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# FNV with a lots of random cache nodes based on i
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for j in 0'u32 ..< DATASET_PARENTS:
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let cache_index = fnv(i.uint32 xor j, mix[j mod r])
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mix[] = zipMap(mix[], cache[cache_index.int mod n].as_u32_words, fnv(x, y))
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result = keccak512 mix[]
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when defined(openmp):
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# Remove stacktraces when using OpenMP, heap alloc from strings will crash.
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{.push stacktrace: off.}
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proc calc_dataset*(full_size: Natural, cache: seq[Hash[512]]): seq[Hash[512]] =
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result = newSeq[Hash[512]](full_size div HASH_BYTES)
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for i in `||`(0, result.len - 1, "simd"):
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# OpenMP loop
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result[i] = calc_dataset_item(cache, i)
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when defined(openmp):
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# Remove stacktraces when using OpenMP, heap alloc from strings will crash.
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{.pop.}
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# ###############################################################################
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# Main loop
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type HashimotoHash = tuple[mix_digest, value: Hash[256]]
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template hashimoto(header: Hash[256],
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nonce: uint64,
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full_size: Natural,
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dataset_lookup_p: untyped,
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dataset_lookup_p1: untyped,
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result: var HashimotoHash
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) =
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let
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n = uint32 full_size div HASH_BYTES
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w = uint32 MIX_BYTES div WORD_BYTES
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mixhashes = uint32 MIX_BYTES div HASH_BYTES
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assert full_size mod HASH_BYTES == 0
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assert MIX_BYTES mod HASH_BYTES == 0
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# combine header+nonce into a 64 byte seed
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var s{.noInit.}: Hash[512]
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let s_bytes = cast[ptr array[64, byte]](addr s) # Alias for to interpret s as a byte array
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let s_words = cast[ptr array[16, uint32]](addr s) # Alias for to interpret s as an uint32 array
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s_bytes[][0..<32] = header.data # We first populate the first 40 bytes of s with the concatenation
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# In template we need to dereference first otherwise it's not considered as var
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var nonceLE{.noInit.}: array[8, byte] # the nonce should be concatenated with its LITTLE ENDIAN representation
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littleEndian64(addr nonceLE, unsafeAddr nonce)
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s_bytes[][32..<40] = cast[array[8,byte]](nonceLE)
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s = keccak_512 s_bytes[][0..<40] # TODO: Does this allocate a seq?
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# start the mix with replicated s
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assert MIX_BYTES div HASH_BYTES == 2
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var mix{.noInit.}: array[32, uint32]
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mix[0..<16] = s_words[]
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mix[16..<32] = s_words[]
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# mix in random dataset nodes
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for i in 0'u32 ..< ACCESSES:
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let p{.inject.} = fnv(i xor s_words[0], mix[i mod w]) mod (n div mixhashes) * mixhashes
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let p1{.inject.} = p + 1
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# Unrolled: for j in range(MIX_BYTES / HASH_BYTES): => for j in 0 ..< 2
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var newdata{.noInit.}: type mix
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newdata[0..<16] = cast[array[16, uint32]](dataset_lookup_p)
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newdata[16..<32] = cast[array[16, uint32]](dataset_lookup_p1)
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mix = zipMap(mix, newdata, fnv(x, y))
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# compress mix
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# ⚠⚠ Warning ⚠⚠: Another bigEndian littleEndian issue?
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# It doesn't seem like the uint32 in cmix need to be changed to big endian
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# cmix is an alias to the result.mix_digest
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let cmix = cast[ptr array[8, uint32]](addr result.mix_digest)
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for i in countup(0, mix.len - 1, 4):
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cmix[i div 4] = mix[i].fnv(mix[i+1]).fnv(mix[i+2]).fnv(mix[i+3])
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var concat{.noInit.}: array[64 + 32, byte]
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concat[0..<64] = s_bytes[]
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concat[64..<96] = cast[array[32, byte]](result.mix_digest)
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result.value = keccak_256(concat)
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proc hashimoto_light*(full_size:Natural, cache: seq[Hash[512]],
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header: Hash[256], nonce: uint64): HashimotoHash {.noSideEffect.} =
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hashimoto(header,
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nonce,
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full_size,
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calc_data_set_item(cache, p),
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calc_data_set_item(cache, p1),
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result)
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proc hashimoto_full*(full_size:Natural, dataset: seq[Hash[512]],
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header: Hash[256], nonce: uint64): HashimotoHash {.noSideEffect.} =
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# TODO spec mentions full_size but I don't think we need it (retrieve it from dataset.len)
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hashimoto(header,
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nonce,
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full_size,
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dataset[int(p)],
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dataset[int(p1)],
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result)
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# ###############################################################################
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# Defining the seed hash
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proc get_seedhash*(block_number: uint64): Hash[256] {.noSideEffect.} =
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for i in 0 ..< int(block_number div EPOCH_LENGTH):
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result = keccak256 result.data
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@ -1,7 +1,7 @@
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# Copyright (c) 2018 Status Research & Development GmbH
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# Distributed under the Apache v2 License (license terms are at http://www.apache.org/licenses/LICENSE-2.0).
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import ./proof_of_work, ./private/casting
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import ./proof_of_work, ./private/conversion
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import endians, random, math
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proc mulCarry(a, b: uint64): tuple[carry, unit: uint64] =
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@ -7,9 +7,6 @@ proc as_u32_words*[N: static[int]](x: Hash[N]): array[N div 32, uint32] {.inline
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# Convert an hash to its uint32 representation
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cast[type result](x)
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type ByteArrayBE*[N: static[int]] = array[N, byte]
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## A byte array that stores bytes in big-endian order
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proc readHexChar(c: char): byte {.noSideEffect.}=
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## Converts an hex char to a byte
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case c
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@ -19,7 +16,7 @@ proc readHexChar(c: char): byte {.noSideEffect.}=
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else:
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raise newException(ValueError, $c & "is not a hexademical character")
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proc hexToByteArrayBE*[N: static[int]](hexStr: string): ByteArrayBE[N] {.noSideEffect, noInit.}=
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proc hexToByteArrayBE*[N: static[int]](hexStr: string): array[N, byte] {.noSideEffect, noInit.}=
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## Read an hex string and store it in a Byte Array in Big-Endian order
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var i = 0
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if hexStr[i] == '0' and (hexStr[i+1] == 'x' or hexStr[i+1] == 'X'):
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@ -44,7 +41,7 @@ proc hexToSeqBytesBE*(hexStr: string): seq[byte] {.noSideEffect.}=
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result[i] = hexStr[2*i].readHexChar shl 4 or hexStr[2*i+1].readHexChar
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inc(i)
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proc toHex*[N: static[int]](ba: ByteArrayBE[N]): string {.noSideEffect.}=
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proc toHex*[N: static[int]](ba: array[N, byte]): string {.noSideEffect.}=
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## Convert a big-endian byte array to its hex representation
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## Output is in lowercase
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@ -68,7 +65,7 @@ proc toHex*(ba: seq[byte]): string {.noSideEffect, noInit.}=
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result[2*i] = hexChars[int ba[i] shr 4 and 0xF]
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result[2*i+1] = hexChars[int ba[i] and 0xF]
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proc toByteArrayBE*[T: SomeInteger](num: T): ByteArrayBE[T.sizeof] {.noSideEffect, noInit, inline.}=
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proc toByteArrayBE*[T: SomeInteger](num: T): array[T.sizeof, byte] {.noSideEffect, noInit, inline.}=
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## Convert an int (in native host endianness) to a big-endian byte array
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# Note: only works on devel
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for i in 0 ..< N:
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result[i] = byte(num shr T((N-1-i) * 8))
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proc toByteArrayBE*[N: static[int]](x: Hash[N]): ByteArrayBE[N div 8] {.inline, noSideEffect, noInit.}=
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proc toByteArrayBE*[N: static[int]](x: Hash[N]): array[N div 8, byte] {.inline, noSideEffect, noInit.}=
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cast[type result](x.data)
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@ -4,8 +4,6 @@
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# Pending https://github.com/alehander42/zero-functional/issues/6
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# A zip + map that avoids heap allocation
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import ./casting
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iterator enumerateZip[N: static[int], T, U](
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a: array[N, T],
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b: array[N, U]
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@ -28,10 +26,11 @@ template zipMap*[N: static[int], T, U](
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op
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))
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var result: array[N, outType]
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{.pragma: align64, codegenDecl: "$# $# __attribute__((aligned(64)))".}
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var result{.noInit, align64.}: array[N, outType]
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for i, x {.inject.}, y {.inject.} in enumerateZip(a, b):
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{.unroll: 4.}
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{.unroll: 4.} # This is a no-op at the moment
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result[i] = op
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result
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@ -4,7 +4,7 @@
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import math, endians,
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keccak_tiny
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import ./private/[primes, casting, functional, intmath]
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import ./private/[primes, conversion, functional, intmath]
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export toHex, hexToByteArrayBE, hexToSeqBytesBE, toByteArrayBE # debug functions
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export keccak_tiny
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