ce564e381a
Changes are as below: Wrap CBlockHeader::nVersion into a new class (CBlockVersion). This allows to take care of interpreting the field into a base version, auxpow flag and the chain ID. Update getauxblock.py for new 'generate' RPC call. Add 'auxpow' to block JSON. Accept auxpow as PoW verification. Add unit tests for auxpow verification. Add check for memory-layout of CBlockVersion. Weaken auxpow chain ID checks for the testnet. Allow Params() to overrule when to check the auxpow chain ID and for legacy blocks. Use this to disable the checks on testnet. Introduce CPureBlockHeader. Split the block header part that is used by auxpow and the "real" block header (that uses auxpow) to resolve the cyclic dependency between the two. Differentiate between uint256 and arith_uint256. This change was done upstream, modify the auxpow code. Add missing lock in auxpow_tests. Fix REST header check for auxpow headers. Those can be longer, thus take that into account. Also perform the check actually on an auxpow header. Correctly set the coinbase for getauxblock results. Call IncrementExtraNonce in getauxblock so that the coinbase is actually initialised with the stuff it should be. (BIP30 block height and COINBASE_FLAGS.) Implement getauxblock plus regression test. Turn auxpow test into FIXTURE test. This allows using of the Params() calls. Move CMerkleTx code to auxpow.cpp. Otherwise we get linker errors when building without wallet. Fix rebase with BIP66. Update the code to handle BIP66's nVersion=3. Enforce that auxpow parent blocks have no auxpow block version. This is for compatibility with namecoind. See also https://github.com/namecoin/namecoin/pull/199. Move auxpow-related parameters to Consensus::Params.
105 lines
2.7 KiB
Python
105 lines
2.7 KiB
Python
#!/usr/bin/env python3
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# Copyright (c) 2014-2018 Daniel Kraft
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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# Basic code for working with auxpow. This is used for the regtests (e.g. from
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# auxpow_testing.py), but also for contrib/auxpow/getwork-wrapper.py.
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import binascii
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import codecs
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import hashlib
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def constructAuxpow (block):
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"""
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Starts to construct a minimal auxpow, ready to be mined. Returns the fake
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coinbase tx and the unmined parent block header as hex strings.
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"""
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block = codecs.encode (block, 'ascii')
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# Start by building the merge-mining coinbase. The merkle tree
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# consists only of the block hash as root.
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coinbase = b"fabe" + binascii.hexlify (b"m" * 2)
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coinbase += block
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coinbase += b"01000000" + (b"00" * 4)
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# Construct "vector" of transaction inputs.
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vin = b"01"
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vin += (b"00" * 32) + (b"ff" * 4)
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vin += codecs.encode ("%02x" % (len (coinbase) // 2), "ascii") + coinbase
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vin += (b"ff" * 4)
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# Build up the full coinbase transaction. It consists only
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# of the input and has no outputs.
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tx = b"01000000" + vin + b"00" + (b"00" * 4)
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txHash = doubleHashHex (tx)
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# Construct the parent block header. It need not be valid, just good
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# enough for auxpow purposes.
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header = b"01000000"
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header += b"00" * 32
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header += reverseHex (txHash)
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header += b"00" * 4
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header += b"00" * 4
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header += b"00" * 4
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return (tx.decode ('ascii'), header.decode ('ascii'))
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def finishAuxpow (tx, header):
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"""
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Constructs the finished auxpow hex string based on the mined header.
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"""
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blockhash = doubleHashHex (header)
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# Build the MerkleTx part of the auxpow.
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auxpow = codecs.encode (tx, 'ascii')
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auxpow += blockhash
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auxpow += b"00"
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auxpow += b"00" * 4
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# Extend to full auxpow.
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auxpow += b"00"
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auxpow += b"00" * 4
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auxpow += header
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return auxpow.decode ("ascii")
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def doubleHashHex (data):
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"""
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Perform Bitcoin's Double-SHA256 hash on the given hex string.
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"""
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hasher = hashlib.sha256 ()
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hasher.update (binascii.unhexlify (data))
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data = hasher.digest ()
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hasher = hashlib.sha256 ()
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hasher.update (data)
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return reverseHex (hasher.hexdigest ())
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def reverseHex (data):
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"""
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Flip byte order in the given data (hex string).
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"""
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b = bytearray (binascii.unhexlify (data))
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b.reverse ()
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return binascii.hexlify (b)
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def getworkByteswap (data):
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"""
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Run the byte-order swapping step necessary for working with getwork.
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"""
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data = bytearray (data)
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assert len (data) % 4 == 0
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for i in range (0, len (data), 4):
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data[i], data[i + 3] = data[i + 3], data[i]
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data[i + 1], data[i + 2] = data[i + 2], data[i + 1]
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return data
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