import pkg/[nimcrypto], eth/[trie, rlp, common, trie/db] export nimcrypto.`$` proc calcRootHash[T](items: openArray[T]): Hash256 = var tr = initHexaryTrie(newMemoryDB()) for i, t in items: tr.put(rlp.encode(i), rlp.encode(t)) return tr.rootHash template calcTxRoot*(transactions: openArray[Transaction]): Hash256 = calcRootHash(transactions) template calcReceiptRoot*(receipts: openArray[Receipt]): Hash256 = calcRootHash(receipts) func keccakHash*(value: openArray[byte]): Hash256 {.inline.} = keccak256.digest value func generateAddress*(address: EthAddress, nonce: AccountNonce): EthAddress = result[0..19] = keccakHash(rlp.encodeList(address, nonce)).data.toOpenArray(12, 31) type ContractSalt* = object bytes*: array[32, byte] const ZERO_CONTRACTSALT* = default(ContractSalt) func generateSafeAddress*(address: EthAddress, salt: ContractSalt, 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.bytes) ctx.update(dataHash.data) ctx.finish hashResult.data ctx.clear() result[0..19] = hashResult.data.toOpenArray(12, 31) 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