nimbus-eth1/nimbus/utils.nim

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import eth/trie/db, eth/[trie, rlp, common], nimcrypto
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export nimcrypto.`$`
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proc calcRootHash[T](items: openArray[T]): Hash256 =
var tr = initHexaryTrie(newMemoryDB())
for i, t in items:
tr.put(rlp.encode(i), rlp.encode(t))
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return tr.rootHash
template calcTxRoot*(transactions: openArray[Transaction]): Hash256 =
calcRootHash(transactions)
template calcReceiptRoot*(receipts: openArray[Receipt]): Hash256 =
calcRootHash(receipts)
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func keccakHash*(value: openarray[byte]): Hash256 {.inline.} =
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keccak256.digest value
func generateAddress*(address: EthAddress, nonce: AccountNonce): EthAddress =
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result[0..19] = keccakHash(rlp.encodeList(address, nonce)).data.toOpenArray(12, 31)
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func generateSafeAddress*(address: EthAddress, salt: Uint256, data: openArray[byte]): EthAddress =
const prefix = [0xff.byte]
let dataHash = keccakHash(data)
var hashResult: Hash256
var ctx: keccak256
ctx.init()
ctx.update(prefix)
ctx.update(address)
ctx.update(salt.toByteArrayBE())
ctx.update(dataHash.data)
ctx.finish hashResult.data
ctx.clear()
result[0..19] = hashResult.data.toOpenArray(12, 31)
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func hash*(b: BlockHeader): Hash256 {.inline.} =
rlpHash(b)
proc crc32*(crc: uint32, buf: openArray[byte]): uint32 =
const kcrc32 = [ 0'u32, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190,
0x6b6b51f4, 0x4db26158, 0x5005713c, 0xedb88320'u32, 0xf00f9344'u32, 0xd6d6a3e8'u32,
0xcb61b38c'u32, 0x9b64c2b0'u32, 0x86d3d2d4'u32, 0xa00ae278'u32, 0xbdbdf21c'u32]
var crcu32 = not crc
for b in buf:
crcu32 = (crcu32 shr 4) xor kcrc32[int((crcu32 and 0xF) xor (uint32(b) and 0xF'u32))]
crcu32 = (crcu32 shr 4) xor kcrc32[int((crcu32 and 0xF) xor (uint32(b) shr 4'u32))]
result = not crcu32