Ethash

作者: Jisen | 来源:发表于2018-08-24 15:50 被阅读0次

原文🔗:Ethash REVISION 23

Ethash是Ethereum 1.0使用的PoW算法。尽管它不能再适当地被称为Dagger-Hashimoto的最新版本,因为这两种算法的许多原始特征发生了巨大的变化。查看https://github.com/ethereum/wiki/blob/master/Dagger-Hashimoto.md的原始版本。

算法所采用的一般路线如下:

  1. 存在一个种子,可以通过扫描区块头直到该点来计算每个块。
  2. 从种子中,可以计算一个16 MB的伪随机缓存。Light客户端存储缓存。
  3. 从缓存中,我们可以生成一个1 GB的数据集,其属性为数据集中每个仅依赖于缓存中的少量项目。完整的客户和矿工存储数据集。数据集随时间线性增长。
  4. 挖掘包括抓取数据集的随机切片并将它们散列在一起。通过使用缓存重新生成所需数据集的特定片段,可以使用低内存完成验证,因此您只需存储缓存。

大型数据集每30000块更新一次,因此绝大多数矿工的努力将会读取数据集,而不是对其进行更改。

有关此算法的设计原理考虑,请参阅https://github.com/ethereum/wiki/wiki/Ethash-Design-Rationale

定义

我们采用以下定义:

WORD_BYTES = 4                    # bytes in word
DATASET_BYTES_INIT = 2**30        # bytes in dataset at genesis
DATASET_BYTES_GROWTH = 2**23      # dataset growth per epoch
CACHE_BYTES_INIT = 2**24          # bytes in cache at genesis
CACHE_BYTES_GROWTH = 2**17        # cache growth per epoch
CACHE_MULTIPLIER=1024             # Size of the DAG relative to the cache
EPOCH_LENGTH = 30000              # blocks per epoch
MIX_BYTES = 128                   # width of mix
HASH_BYTES = 64                   # hash length in bytes
DATASET_PARENTS = 256             # number of parents of each dataset element
CACHE_ROUNDS = 3                  # number of rounds in cache production
ACCESSES = 64                     # number of accesses in hashimoto loop

关于本规范中描述的“SHA3”散列的注释

以太坊的发展与SHA3标准的发展一致,并且标准过程对最终散列算法的填充做了一个最新变更,因此以太坊的“sha3_256”和“sha3_512”散列不是标准sha3散列,而是一个经常提到的变体在其他情况下为“Keccak-256”和“Keccak-512”。参见讨论,例如在Rename/alias sha3 to minimize confusion with SHA-3 standard #59,在Which cryptographic hash function does Ethereum use?What is the approach to calculate an Ethereum address from a 256 bit private key?

请记住这一点,因为在下面的算法描述中提到了“sha3”散列。

参数

Ethash的缓存和数据集的参数取决于区块号。缓存大小和数据集大小都线性增长; 然而,我们总是采用低于线性增长阈值的最高素数,以降低意外规律性导致循环行为的风险。

def get_cache_size(block_number):
    sz = CACHE_BYTES_INIT + CACHE_BYTES_GROWTH * (block_number // EPOCH_LENGTH)
    sz -= HASH_BYTES
    while not isprime(sz / HASH_BYTES):
        sz -= 2 * HASH_BYTES
    return sz

def get_full_size(block_number):
    sz = DATASET_BYTES_INIT + DATASET_BYTES_GROWTH * (block_number // EPOCH_LENGTH)
    sz -= MIX_BYTES
    while not isprime(sz / MIX_BYTES):
        sz -= 2 * MIX_BYTES
    return sz

附录提供了数据集和缓存大小值表。

生成缓存

现在,我们指定生成缓存的函数:

def mkcache(cache_size, seed):
    n = cache_size // HASH_BYTES

    # Sequentially produce the initial dataset
    o = [sha3_512(seed)]
    for i in range(1, n):
        o.append(sha3_512(o[-1]))

    # Use a low-round version of randmemohash
    for _ in range(CACHE_ROUNDS):
        for i in range(n):
            v = o[i][0] % n
            o[i] = sha3_512(map(xor, o[(i-1+n) % n], o[v]))

    return o

缓存生成过程首先依次填充32 MB内存,然后从严格内存硬散列函数(2014)中执行两次Sergio Demian Lerner的RandMemoHash算法。输出是一组524288个64字节值。

数据聚合功能

在某些情况下,我们使用受FNV hash启发的算法作为XOR的非关联替代。请注意,我们将素数与完整的32位输入相乘,与将素数依次乘以一个字节(八位字节)的FNV-1规格相反。

FNV_PRIME = 0x01000193

def fnv(v1, v2):
    return ((v1 * FNV_PRIME) ^ v2) % 2**32

请注意,由于黄皮书上指定fnv为v1 *(FNV_PRIME ^ v2),所有当前实现一致地使用上述定义。

完整的数据集计算

整个1 GB数据集中的每个64字节的item计算如下:

def calc_dataset_item(cache, i):
    n = len(cache)
    r = HASH_BYTES // WORD_BYTES
    # initialize the mix
    mix = copy.copy(cache[i % n])
    mix[0] ^= i
    mix = sha3_512(mix)
    # fnv it with a lot of random cache nodes based on i
    for j in range(DATASET_PARENTS):
        cache_index = fnv(i ^ j, mix[j % r])
        mix = map(fnv, mix, cache[cache_index % n])
    return sha3_512(mix)

实质上,我们将256个伪随机选择的缓存节点的数据进行组合,并将其散列以计算数据集节点。整个数据集然后通过以下方式生成:

def  calc_dataset(full_size,cache):
     return [calc_dataset_item(cache,i)for i in  range(full_size //  HASH_BYTES)]

Main Loop

现在,我们指定主要的“hashimoto”式循环,在这里我们汇总来自整个数据集的数据,以便为特定的区块头和随机数生成我们的最终值。在下面的代码,header表示基于SHA3​​-256散列以RLP编码的一个截断区块头,即不包括mixHashnonce字段的区块头。nonce是大端序列的64位无符号整数的八个字节。所以nonce[::-1]是其小端序列的八个字节:

def hashimoto(header, nonce, full_size, dataset_lookup):
    n = full_size / HASH_BYTES
    w = MIX_BYTES // WORD_BYTES
    mixhashes = MIX_BYTES / HASH_BYTES
    # combine header+nonce into a 64 byte seed
    s = sha3_512(header + nonce[::-1])
    # start the mix with replicated s
    mix = []
    for _ in range(MIX_BYTES / HASH_BYTES):
        mix.extend(s)
    # mix in random dataset nodes
    for i in range(ACCESSES):
        p = fnv(i ^ s[0], mix[i % w]) % (n // mixhashes) * mixhashes
        newdata = []
        for j in range(MIX_BYTES / HASH_BYTES):
            newdata.extend(dataset_lookup(p + j))
        mix = map(fnv, mix, newdata)
    # compress mix
    cmix = []
    for i in range(0, len(mix), 4):
        cmix.append(fnv(fnv(fnv(mix[i], mix[i+1]), mix[i+2]), mix[i+3]))
    return {
        "mix digest": serialize_hash(cmix),
        "result": serialize_hash(sha3_256(s+cmix))
    }

def hashimoto_light(full_size, cache, header, nonce):
    return hashimoto(header, nonce, full_size, lambda x: calc_dataset_item(cache, x))

def hashimoto_full(full_size, dataset, header, nonce):
    return hashimoto(header, nonce, full_size, lambda x: dataset[x])

本质上,我们保持128字节的"mix",并从整个数据集中重复顺序获取128个字节,并使用该fnv函数将其与"mix"进行组合。使用128字节的顺序访问,以便算法的每一轮总是从RAM中提取整个页面,从而最大限度地减少ASIC在理论上能够避免的数据翻译遗漏。

如果此算法的输出低于所需目标,则该随机数是有效的。请注意,最后的额外应用程序sha3_256确保存在可以提供的中间随机数,以证明至少进行了少量工作; 这个快速外部PoW验证可以用于反DDoS的目的。它还可以提供统计保证,结果是一个256位数字。

挖矿

挖矿算法定义如下:

def mine(full_size, dataset, header, difficulty):
    target = zpad(encode_int(2**256 // difficulty), 64)[::-1]
    from random import randint
    nonce = randint(0, 2**64)
    while hashimoto_full(full_size, dataset, header, nonce) > target:
        nonce = (nonce + 1) % 2**64
    return nonce

定义种子散列

为了计算将用于在给定块之上挖掘的种子散列,我们使用以下算法:

 def get_seedhash(block):
     s = '\x00' * 32
     for i in range(block.number // EPOCH_LENGTH):
         s = serialize_hash(sha3_256(s))
     return s

请注意,为了顺利进行挖掘和验证,我们建议在一个单独的线程中预先计算之后的种子散列集和数据集。

附录

如果您有兴趣将上面的python规范作为代码运行,应该预先考虑以下代码。

import sha3, copy

# Assumes little endian bit ordering (same as Intel architectures)
def decode_int(s):
    return int(s[::-1].encode('hex'), 16) if s else 0

def encode_int(s):
    a = "%x" % s
    return '' if s == 0 else ('0' * (len(a) % 2) + a).decode('hex')[::-1]

def zpad(s, length):
    return s + '\x00' * max(0, length - len(s))

def serialize_hash(h):
    return ''.join([zpad(encode_int(x), 4) for x in h])
  
def deserialize_hash(h):
    return [decode_int(h[i:i+WORD_BYTES]) for i in range(0, len(h), WORD_BYTES)]
  
def hash_words(h, sz, x):
    if isinstance(x, list):
        x = serialize_hash(x)
    y = h(x)
    return deserialize_hash(y)

def serialize_cache(ds):
    return ''.join([serialize_hash(h) for h in ds])
  
serialize_dataset = serialize_cache

# sha3 hash function, outputs 64 bytes
def sha3_512(x):
    return hash_words(lambda v: sha3.sha3_512(v).digest(), 64, x)

def sha3_256(x):
    return hash_words(lambda v: sha3.sha3_256(v).digest(), 32, x)

def xor(a, b):
    return a ^ b

def isprime(x):
    for i in range(2, int(x**0.5)):
         if x % i == 0:
             return False
    return True

数据大小

以下查找表提供了约2048个数据大小和缓存大小的制表。它们是用这里提供的Mathematica函数生成的:

def  get_datasize(block_number):
     返回 data_sizes [block_number //  EPOCH_LENGTH ]

def  get_cachesize(block_number):
     返回 cache_sizes [block_number //  EPOCH_LENGTH ]

data_sizes = [
 1073739904,1082130304,1090514816,1098906752,1107293056, 
 1115684224,1124070016,1132461952,1140849536,1149232768, 
 1157627776,1166013824,1174404736,1182786944,1191180416, 
 1199568512,1207958912,1216345216,1224732032,1233124736, 
 1241513344,1249902464,1258290304,1266673792,1275067264, 
 1283453312,1291844992,1300234112,1308619904,1317010048, 
 1325397376,1333787776,1342176128,1350561664,1358954368, 
 1367339392,1375731584,1384118144,1392507008,1400897408, 
 1409284736,1417673344,1426062464,1434451072,1442839168, 
 1451229056,1459615616,1468006016,1476394112,1484782976, 
 1493171584,1501559168,1509948032,1518337664,1526726528, 
 1535114624,1543503488,1551892096,1560278656,1568669056, 
 1577056384,1585446272,1593831296,1602219392,1610610304, 
1619000192,1627386752,1635773824,1644164224,1652555648, 
 1660943488,1669332608,1677721216,1686109312,1694497664, 
 1702886272,1711274624,1719661184,1728047744,1736434816, 
 1744829056,1753218944,1761606272,1769995904,1778382464, 
 1786772864,1795157888,1803550592,1811937664,1820327552, 
 1828711552,1837102976,1845488768,1853879936,1862269312, 
 1870656896,1879048064,1887431552,1895825024,1904212096, 
 1912601216,1920988544,1929379456,1937765504,1946156672, 
 1954543232,1962932096,1971321728,1979707264,1988093056, 
 1996487552,2004874624,2013262208,2021653888,2030039936, 
 2038430848,2046819968,2055208576,2063596672,2071981952, 
 2080373632,2088762752,2097149056,2105539712,2113928576, 
 2122315136,2130700672,2139092608,2147483264,2155872128, 
 2164257664,2172642176,2181035392,2189426048,2197814912, 
 2206203008,2214587264,2222979712,2231367808,2239758208, 
 2248145024,2256527744,2264922752,2273312128,2281701248, 
 2290086272,2298476672,2306867072,2315251072,2323639168, 
 2332032128,2340420224,2348808064,2357196416,2365580416, 
 2373966976,2382363008,2390748544,2399139968,2407530368, 
 2415918976,2424307328,2432695424,2441084288,2449472384, 
 2457861248,2466247808,2474637184,2483026816,2491414144, 
 2499803776,2508191872,2516582272,2524970368,2533359232, 
2541743488,2550134144,2558525056,2566913408,2575301504, 
 2583686528,2592073856,2600467328,2608856192,2617240448, 
 2625631616,2634022016,2642407552,2650796416,2659188352, 
 2667574912,2675965312,2684352896,2692738688,2701130624, 
 2709518464,2717907328,2726293376,2734685056,2743073152, 
 2751462016,2759851648,2768232832,2776625536,2785017728, 
 2793401984,2801794432,2810182016,2818571648,2826959488, 
 2835349376,2843734144,2852121472,2860514432,2868900992, 
 2877286784,2885676928,2894069632,2902451584,2910843008, 
 2919234688,2927622784,2936011648,2944400768,2952789376, 
 2961177728,2969565568,2977951616,2986338944,2994731392, 
 3003120256,3011508352,3019895936,3028287104,3036675968, 
 3045063808,3053452928,3061837696,3070228352,3078615424, 
 3087003776,3095394944,3103782272,3112173184,3120562048, 
 3128944768,3137339264,3145725056,3154109312,3162505088, 
 3170893184,3179280256,3187669376,3196056704,3204445568, 
 3212836736,3221224064,3229612928,3238002304,3246391168, 
 3254778496,3263165824,3271556224,3279944576,3288332416, 
 3296719232,3305110912,3313500032,3321887104,3330273152, 
 3338658944,3347053184,3355440512,3363827072,3372220288, 
 3380608384,3388997504,3397384576,3405774208,3414163072, 
 3422551936,3430937984,3439328384,3447714176,3456104576, 
3464493952,3472883584,3481268864,3489655168,3498048896, 
 3506434432,3514826368,3523213952,3531603584,3539987072, 
 3548380288,3556763264,3565157248,3573545344,3581934464, 
 3590324096,3598712704,3607098752,3615488384,3623877248, 
 3632265856,3640646528,3649043584,3657430144,3665821568, 
 3674207872,3682597504,3690984832,3699367808,3707764352, 
 3716152448,3724541056,3732925568,3741318016,3749706368, 
 3758091136,3766481536,3774872704,3783260032,3791650432, 
 3800036224,3808427648,3816815488,3825204608,3833592704, 
 3841981568,3850370432,3858755968,3867147904,3875536256, 
 3883920512,3892313728,3900702592,3909087872,3917478784, 
 3925868416,3934256512,3942645376,3951032192,3959422336, 
 3967809152,3976200064,3984588416,3992974976,4001363584, 
 4009751168,4018141312,4026530432,4034911616,4043308928, 
 4051695488,4060084352,4068472448,4076862848,4085249408, 
 4093640576,4102028416,4110413696,4118805632,4127194496, 
 4135583104,4143971968,4152360832,4160746112,4169135744, 
 4177525888,4185912704,4194303616,4202691968,4211076736, 
 4219463552,4227855488,4236246656,4244633728,4253022848, 
 4261412224,4269799808,4278184832,4286578048,4294962304, 
 4303349632,4311743104,4320130432,4328521088,4336909184, 
 4345295488,4353687424,4362073472,4370458496,4378852736, 
4387238528,4395630208,4404019072,4412407424,4420790656, 
 4429182848,4437571456,4445962112,4454344064,4462738048, 
 4471119232,4479516544,4487904128,4496289664,4504682368, 
 4513068416,4521459584,4529846144,4538232704,4546619776, 
 4555010176,4563402112,4571790208,4580174464,4588567936, 
 4596957056,4605344896,4613734016,4622119808,4630511488, 
 4638898816,4647287936,4655675264,4664065664,4672451968, 
 4680842624,4689231488,4697620352,4706007424,4714397056, 
 4722786176,4731173248,4739562368,4747951744,4756340608, 
 4764727936,4773114496,4781504384,4789894784,4798283648, 
 4806667648,4815059584,4823449472,4831835776,4840226176, 
 4848612224,4857003392,4865391488,4873780096,4882169728, 
 4890557312,4898946944,4907333248,4915722368,4924110976, 
 4932499328,4940889728,4949276032,4957666432,4966054784, 
 4974438016,4982831488,4991221376,4999607168,5007998848, 
 5016386432,5024763776,5033164672,5041544576,5049941888, 
 5058329728,5066717056,5075107456,5083494272,5091883904, 
 5100273536,5108662144,5117048192,5125436032,5133827456, 
 5142215296,5150605184,5158993024,5167382144,5175769472, 
 5184157568,5192543872,5200936064,5209324928,5217711232, 
 5226102656,5234490496,5242877312,5251263872,5259654016, 
 5268040832,5276434304,5284819328,5293209728,5301598592, 
5309986688,5318374784,5326764416,5335151488,5343542144, 
 5351929472,5360319872,5368706944,5377096576,5385484928, 
 5393871232,5402263424,5410650496,5419040384,5427426944, 
 5435816576,5444205952,5452594816,5460981376,5469367936, 
 5477760896,5486148736,5494536832,5502925952,5511315328, 
 5519703424,5528089984,5536481152,5544869504,5553256064, 
 5561645696,5570032768,5578423936,5586811264,5595193216, 
 5603585408,5611972736,5620366208,5628750464,5637143936, 
 5645528192,5653921408,5662310272,5670694784,5679082624, 
 5687474048,5695864448,5704251008,5712641408,5721030272, 
 5729416832,5737806208,5746194304,5754583936,5762969984, 
 5771358592,5779748224,5788137856,5796527488,5804911232, 
 5813300608,5821692544,5830082176,5838468992,5846855552, 
 5855247488,5863636096,5872024448,5880411008,5888799872, 
 5897186432,5905576832,5913966976,5922352768,5930744704, 
 5939132288,5947522432,5955911296,5964299392,5972688256, 
 5981074304,5989465472,5997851008,6006241408,6014627968, 
 6023015552,6031408256,6039796096,6048185216,6056574848, 
 6064963456,6073351808,6081736064,6090128768,6098517632, 
 6106906496,6115289216,6123680896,6132070016,6140459648, 
 6148849024,6157237376,6165624704,6174009728,6182403712, 
 6190792064,6199176064,6207569792,6215952256,6224345216, 
6232732544,6241124224,6249510272,6257899136,6266287744, 
 6274676864,6283065728,6291454336,6299843456,6308232064, 
 6316620928,6325006208,6333395584,6341784704,6350174848, 
 6358562176,6366951296,6375337856,6383729536,6392119168, 
 6400504192,6408895616,6417283456,6425673344,6434059136, 
 6442444672,6450837376,6459223424,6467613056,6476004224, 
 6484393088,6492781952,6501170048,6509555072,6517947008, 
 6526336384,6534725504,6543112832,6551500672,6559888768, 
 6568278656,6576662912,6585055616,6593443456,6601834112, 
 6610219648,6618610304,6626999168,6635385472,6643777408, 
 6652164224,6660552832,6668941952,6677330048,6685719424, 
 6694107776,6702493568,6710882176,6719274112,6727662976, 
 6736052096,6744437632,6752825984,6761213824,6769604224, 
 6777993856,6786383488,6794770816,6803158144,6811549312, 
 6819937664,6828326528,6836706176,6845101696,6853491328, 
 6861880448,6870269312,6878655104,6887046272,6895433344, 
 6903822208,6912212864,6920596864,6928988288,6937377152, 
 6945764992,6954149248,6962544256,6970928768,6979317376, 
 6987709312,6996093824,7004487296,7012875392,7021258624, 
 7029652352,7038038912,7046427776,7054818944,7063207808, 
 7071595136,7079980928,7088372608,7096759424,7105149824, 
 7113536896,7121928064,7130315392,7138699648,7147092352, 
7155479168,7163865728,7172249984,7180648064,7189036672, 
 7197424768,7205810816,7214196608,7222589824,7230975104, 
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 284950208,285081536 ]

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