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2018-06-05Merge #13351: wallet: Prevent segfault when sending to unspendable witnessMarcoFalke
fa36aa7965 wallet: Prevent segfault when sending to unspendable witness (MarcoFalke) Pull request description: Previously we wouldn't care about the `txnouttype`, but after 4e91820531889e309dc4335fe0de8229c6426040 we `switch` on the type. Tree-SHA512: 6b597aba80cb43881671ad7b3a4ad97753864e8005a05c23fdd8ee79953483c08f241b5c392a9b494298eadc5cfba895b0480d916ef4f11d122fd6196f31b84a
2018-06-05Drop uint 256 not operatorBen Woosley
All the other operators are integer or bit operations, and this is unused apart from tests.
2018-06-04index: Remove TxIndexDB from public interface of TxIndex.Jim Posen
2018-06-04Merge #13191: Specialized double-SHA256 with 64 byte inputs with SSE4.1 and AVX2Wladimir J. van der Laan
4defdfab94504018f822dc34a313ad26cedc8255 [MOVEONLY] Move unused Merkle branch code to tests (Pieter Wuille) 4437d6e1f3107a20a8c7b66be8b4b972a82e3b28 8-way AVX2 implementation for double SHA256 on 64-byte inputs (Pieter Wuille) 230294bf5fdeba7213471cd0b795fb7aa36e5717 4-way SSE4.1 implementation for double SHA256 on 64-byte inputs (Pieter Wuille) 1f0e7ca09c9d7c5787c218156fa5096a1bdf2ea8 Use SHA256D64 in Merkle root computation (Pieter Wuille) d0c96328833127284574bfef26f96aa2e4afc91a Specialized double sha256 for 64 byte inputs (Pieter Wuille) 57f34630fb6c3e218bd19535ac607008cb894173 Refactor SHA256 code (Pieter Wuille) 0df017889b4f61860092e1d54e271092cce55f62 Benchmark Merkle root computation (Pieter Wuille) Pull request description: This introduces a framework for specialized double-SHA256 with 64 byte inputs. 4 different implementations are provided: * Generic C++ (reusing the normal SHA256 code) * Specialized C++ for 64-byte inputs, but no special instructions * 4-way using SSE4.1 intrinsics * 8-way using AVX2 intrinsics On my own system (AVX2 capable), I get these benchmarks for computing the Merkle root of 9001 leaves (supported lengths / special instructions / parallellism): * 7.2 ms with varsize/naive/1way (master, non-SSE4 hardware) * 5.8 ms with size64/naive/1way (this PR, non-SSE4 capable systems) * 4.8 ms with varsize/SSE4/1way (master, SSE4 hardware) * 2.9 ms with size64/SSE4/4way (this PR, SSE4 hardware) * 1.1 ms with size64/AVX2/8way (this PR, AVX2 hardware) Tree-SHA512: efa32d48b32820d9ce788ead4eb583949265be8c2e5f538c94bc914e92d131a57f8c1ee26c6f998e81fb0e30675d4e2eddc3360bcf632676249036018cff343e
2018-05-30wallet: Prevent segfault when sending to unspendable witnessMarcoFalke
2018-05-30Give an error and exit if there are unknown parametersAndrew Chow
If an unknown option is given via either the command line args or the conf file, throw an error and exit Update tests for ArgsManager knowing args Ignore unknown options in the config file for bitcoin-cli Fix tests and bitcoin-cli to match actual options used
2018-05-29[MOVEONLY] Move unused Merkle branch code to testsPieter Wuille
2018-05-29Specialized double sha256 for 64 byte inputsPieter Wuille
2018-05-24Merge #13291: test: Don't include torcontrol.cpp into the test fileMarcoFalke
97c112d4ca Declare TorReply parsing functions in torcontrol_tests (Ben Woosley) Pull request description: These methods are standalone string parsing methods which were included into test via an include of torcontrol.cpp, which is bad practice. ~~Splitting them out reveals that they were the only torcontrol.cpp methods under test, so the test file is renamed tor_reply_tests.cpp.~~ Introduced in #10408 Tree-SHA512: 8ff11a9c900a88f910a73dfe16f43581a567e9d60e9298a8a963fc9dd7cffb4d97a644da677610aafb7d89f1dd1cede9afeae2c6344305e021a9a322dbcea0ac
2018-05-23Merge #13011: Cache witness hash in CTransactionWladimir J. van der Laan
fac1223a568fa1ad6dd602350598eed278d115e8 Cache witness hash in CTransaction (MarcoFalke) faab55fbb17f2ea5080bf02bc59eeef5ca746f07 Make CMutableTransaction constructor explicit (MarcoFalke) Pull request description: This speeds up: * compactblocks (v2) * ATMP * validation and miner (via `BlockWitnessMerkleRoot`) * sigcache (see also unrelated #13204) * rpc and rest (nice, but irrelevant) This presumably slows down rescan, which uses a `CTransaction` and its `GetHash`, but never uses the `GetWitnessHash`. The slow down is proportional to the number of witness transactions in the rescan window. I.e. early in the chain there should be no measurable slow down. Later in the chain, there should be a slow down, but acceptable given the speedups in the modules mentioned above. Tree-SHA512: 443e86acfcceb5af2163e68840c581d44159af3fd1fce266cab3504b29fcd74c50812b69a00d41582e7e1c5ea292f420ce5e892cdfab691da9c24ed1c44536c7
2018-05-23Do not use uppercase characters in source code filenamespracticalswift
2018-05-22Merge #13282: trivial: Mark overrides as such.MarcoFalke
60ebc7da4c trivial: Mark overrides as such. (Daniel Kraft) Pull request description: This trivial change adds the `override` keyword to some methods that override virtual base class / interface methods. This ensures that any future changes to the interface's method signatures which are not correctly mirrored in the subclasses will break at compile time with a clear error message, rather than at runtime. Tree-SHA512: cc1bfa5f03b5e29d20e3eab07b0b5fa2f77b47f79e08263dbff43e4f463e9dd8f4f537e2c8c9b6cb3663220dcf40cfd77723cd9fcbd623c9efc90a4cd44facfc
2018-05-21Declare TorReply parsing functions in torcontrol_testsBen Woosley
Rather than including the implementation file into the test, which is bad practice.
2018-05-20Drop the chain argument to GetDifficultyBen Woosley
This removes the need to include rpc/blockchain.cpp in order to put GetDifficulty under test. GetDifficulty was called in two ways: * with a guaranteed non-null blockindex * with no argument Change the latter case to be provided chainActive.Tip() explicitly.
2018-05-20trivial: Mark overrides as such.Daniel Kraft
This trivial change adds the "override" keyword to some methods of subclasses meant to override interface methods. This ensures that any future change to the interface' method signatures which are not correctly mirrored in the subclass will break at compile time with a clear error message, rather than fail at runtime (which is harder to debug).
2018-05-19scripted-diff: Rename master key to seedJohn Newbery
-BEGIN VERIFY SCRIPT- ren() { git grep -l "\<$1\>" 'src/*.cpp' 'src/*.h' test | xargs sed -i "s:\<$1\>:$2:g"; } ren GenerateNewHDMasterKey GenerateNewSeed ren DeriveNewMasterHDKey DeriveNewSeed ren SetHDMasterKey SetHDSeed ren hdMasterKeyID hd_seed_id ren masterKeyID seed_id ren SetMaster SetSeed ren hdmasterkeyid hdseedid ren hdmaster hdseed -END VERIFY SCRIPT-
2018-05-18Drop UpdateTransaction in favor of UpdateInputBen Woosley
Updating the input explicitly requires the caller to present a mutable input, which more clearly communicates the effects and intent of the method. In most cases, this input is already immediately available and need not be looked up.
2018-05-18Add Unit Test for SingleThreadedSchedulerClientJesse Cohen
Ensures ordering of callbacks within a SingleThreadedSchedulerClient with respect to each other
2018-05-16Merge #13023: Fix some concurrency issues in ActivateBestChain()Wladimir J. van der Laan
dd435ad Add unit tests for signals generated by ProcessNewBlock() (Jesse Cohen) a3ae8e6 Fix concurrency-related bugs in ActivateBestChain (Jesse Cohen) ecc3c4a Do not unlock cs_main in ABC unless we've actually made progress. (Matt Corallo) Pull request description: Originally this PR was just to add tests around concurrency in block validation - those tests seem to have uncovered another bug in ActivateBestChain - this now fixes that bug and adds tests. ActivateBestChain (invoked after a new block is validated) proceeds in steps - acquiring and releasing cs_main while incrementally disconnecting and connecting blocks to sync to the most work chain known (FindMostWorkChain()). Every time cs_main is released the result of FindMostWorkChain() can change - but currently that value is cached across acquisitions of cs_main and only refreshed when an invalid chain is explored. It needs to be refreshed every time cs_main is reacquired. The test added in https://github.com/bitcoin/bitcoin/pull/13023/commits/6094ce73045fe0b4654ff94327c2059512af88fb will occasionally fail without the commit fixing this issue https://github.com/bitcoin/bitcoin/pull/13023/commits/26bfdbaddbb9f13864deb7241c6d513f22c5ab62 Original description below -- After a bug discovered where UpdatedBlockTip() notifications could be triggered out of order (#12978), these unit tests check certain invariants about these signals. The scheduler test asserts that a SingleThreadedSchedulerClient processes callbacks fully and sequentially. The block validation test generates a random chain and calls ProcessNewBlock from multiple threads at random and in parallel. ValidationInterface callbacks verify that the ordering of BlockConnected BlockDisconnected and UpdatedBlockTip events occur as expected. Tree-SHA512: 4102423a03d2ea28580c7a70add8a6bdb22ef9e33b107c3aadef80d5af02644cdfaae516c44933924717599c81701e0b96fbf9cf38696e9e41372401a5ee1f3c
2018-05-16Add unit tests for signals generated by ProcessNewBlock()Jesse Cohen
After a recent bug discovered in callback ordering in MainSignals, this test checks invariants in ordering of BlockConnected / BlockDisconnected / UpdatedChainTip signals
2018-05-15Merge #12881: Minor optimizations to bech32::Decode(); add tests.Wladimir J. van der Laan
60f61f9 Tighten up bech32::Decode(); add tests. (murrayn) Pull request description: Just a few minor optimizations to bech32::Decode(): 1) optimize the order and logic of the conditionals 2) get rid of subsequent '(c < 33 || c > 126)' check which is redundant (already performed above) 3) add a couple more bech32 tests (mixed-case) Tree-SHA512: e41af834c8f6b7d34c22c28b724df42c60f72e00df616e70a12efbc4271d15d80627fe1bc36845caf29f615c238499a566298a863cbe119fef457287231053c8
2018-05-14Break circular dependency: chain -> pow -> chainBen Woosley
chain.h does not actually depend on the methods defined in pow.h, just its include of consensus/params.h, which is standalone and can be included instead. Confirmed by inspection and successful build.
2018-05-14Merge #12963: Fix Clang Static Analyzer warningsMarcoFalke
159c32d1f1 Add assertion to guide static analyzers. Clang Static Analyzer needs this guidance. (practicalswift) fd447a6efe Fix dead stores. Values were stored but never read. Limit scope. (practicalswift) Pull request description: Fix Clang Static Analyzer warnings reported by @kallewoof in #12961: * Fix dead stores. Values were stored but never read. * Add assertion to guide static analyzers. See #12961 for details. Tree-SHA512: 83dbec821f45217637316bee978e7543f2d2caeb7f7b0b3aec107fede0fff8baa756da8f6b761ae0d38537740839ac9752f6689109c38a4b05c0c041aaa3a1fb
2018-05-14Merge #11689: mempool: Fix missing locking in CTxMemPool::check(…) and ↵MarcoFalke
CTxMemPool::setSanityCheck(…) 47782b49e6 Add Clang thread safety analysis annotations (practicalswift) 0e2dfa8a65 Fix missing locking in CTxMemPool::setSanityCheck(double dFrequency) (practicalswift) 6bc5b7100b Fix missing locking in CTxMemPool::check(const CCoinsViewCache *pcoins) (practicalswift) Pull request description: Fix missing locking in `CTxMemPool::check(const CCoinsViewCache *pcoins)`: * reading variable `mapTx` requires holding mutex `cs` * reading variable `mapNextTx` requires holding mutex `cs` * reading variable `nCheckFrequency` requires holding mutex `cs` Fix missing locking in `CTxMemPool::setSanityCheck(double dFrequency)`: * writing variable `nCheckFrequency` requires holding mutex `cs` Tree-SHA512: ce7c365ac89225223fb06e6f469451b121acaa499f35b21ad8a6d2a266c91194639b3703c5428871be033d4f5f7be790cc297bd8c25b2e0c59345ef09c3693d0
2018-05-12Merge #11423: [Policy] Several transaction standardness rulesWladimir J. van der Laan
364bae5 qa: Pad scriptPubKeys to get minimum sized txs (MarcoFalke) 7485488 Policy to reject extremely small transactions (Johnson Lau) 0f8719b Add transaction tests for constant scriptCode (Johnson Lau) 9dabfe4 Add constant scriptCode policy in non-segwit scripts (Johnson Lau) Pull request description: This disables `OP_CODESEPARATOR` in non-segwit scripts (even in an unexecuted branch), and makes a positive `FindAndDelete` result invalid. This ensures that the `scriptCode` serialized in `SignatureHash` is always the same as the script passing to the `EvalScript`. Tree-SHA512: a0552cb920294d130251c48053fa2ff1fbdd26332e62b52147d918837852750f0ce35ce2cd1cbdb86588943312f8154ccb4925e850dbb7c2254bc353070cd5f8
2018-05-05Add Clang thread safety analysis annotationspracticalswift
2018-05-04Make CMutableTransaction constructor explicitMarcoFalke
Silently converting to a CMutableTransaction will drop all caches and should thus be done explicitly
2018-05-05Add transaction tests for constant scriptCodeJohnson Lau
Tests showing that CONST_SCRIPTCODE is applied only to non-segwit transactions
2018-05-05Add constant scriptCode policy in non-segwit scriptsJohnson Lau
This disables OP_CODESEPARATOR in non-segwit scripts (even in an unexecuted branch), and makes a positive FindAndDelete result invalid. This ensures that the scriptCode serialized in SignatureHash() is always the same as the script passing to the EvalScript.
2018-05-03Make it clear which functions that are intended to be translation unit localpracticalswift
Do not share functions that are meant to be translation unit local with other translation units. Use internal linkage for those consistently.
2018-04-29util: Store debug log file path in BCLog::Logger member.Jim Posen
This breaks the cyclic between logging and util.
2018-04-29scripted-diff: Rename BCLog::Logger member variables.Jim Posen
-BEGIN VERIFY SCRIPT- sed -i "s/fileout/m_fileout/" src/logging.h src/logging.cpp sed -i "s/mutexDebugLog/m_file_mutex/" src/logging.h src/logging.cpp sed -i "s/vMsgsBeforeOpenLog/m_msgs_before_open/" src/logging.h src/logging.cpp sed -i "s/logCategories/m_categories/" src/logging.h src/logging.cpp sed -i "s/fPrintToConsole/m_print_to_console/" src/logging.h src/logging.cpp src/init.cpp sed -i "s/fPrintToDebugLog/m_print_to_file/" src/logging.h src/logging.cpp src/init.cpp src/test/test_bitcoin.cpp src/bench/bench_bitcoin.cpp sed -i "s/fLogTimestamps/m_log_timestamps/" src/logging.h src/logging.cpp src/init.cpp sed -i "s/fLogTimeMicros/m_log_time_micros/" src/logging.h src/logging.cpp src/init.cpp sed -i "s/fReopenDebugLog/m_reopen_file/" src/logging.h src/logging.cpp src/init.cpp sed -i "s/fStartedNewLine/m_started_new_line/" src/logging.h src/logging.cpp -END VERIFY SCRIPT-
2018-04-27util: Establish global logger object.Jim Posen
The object encapsulates logging configuration, and in a later commit, set up routines will also be moved into the class.
2018-04-26Merge #13002: Do not treat bare multisig outputs as IsMine unless watchedWladimir J. van der Laan
7d0f80b Use anonymous namespace instead of static functions (Pieter Wuille) b61fb71 Mention removal of bare multisig IsMine in release notes (Pieter Wuille) 9c2a8b8 Do not treat bare multisig as IsMine (Pieter Wuille) 08f3228 Optimization: only test for witness scripts at top level (Pieter Wuille) 3619735 Track difference between scriptPubKey and P2SH execution in IsMine (Pieter Wuille) ac6ec62 Switch to a private version of SigVersion inside IsMine (Pieter Wuille) 19fc973 Do not expose SigVersion argument to IsMine (Pieter Wuille) fb1dfbb Remove unused IsMine overload (Pieter Wuille) 952d821 Make CScript -> CScriptID conversion explicit (Pieter Wuille) Pull request description: Currently our wallet code will treat bare multisig outputs (meaning scriptPubKeys with multiple public keys + `OP_CHECKMULTISIG` operator in it) as ours without the user asking for it, as long as all private keys in it are in our wallet. This is a pointless feature. As it only works when all private keys are in one place, it's useless compared to single key outputs (P2PK, P2PKH, P2WPKH, P2SH-P2WPKH), and worse in terms of space, cost, UTXO size, and ability to test (due to lack of address format for them). Furthermore, they are problematic in that producing a list of all `scriptPubKeys` we accept is not tractable (it involves all combinations of all public keys that are ours). In further wallet changes I'd like to move to a model where all scriptPubKeys that are treated as ours are explicit, rather than defined by whatever keys we have. The current behavior of the wallet is very hard to model in such a design, so I'd like to get rid of it. I think there are two options: * Remove it entirely (do not ever accept bare multisig outputs as ours, unless watched) * Only accept bare multisig outputs in situations where the P2SH version of that output would also be acceptable This PR implements the first option. The second option was explored in #12874. Tree-SHA512: 917ed45b3cac864cee53e27f9a3e900390c576277fbd6751b1250becea04d692b3b426fa09065a3399931013bd579c4f3dbeeb29d51d19ed0c64da75d430ad9a
2018-04-25[test] Simple unit test for TxIndex.Jim Posen
2018-04-23Make tests pass after 2020Bernhard M. Wiedemann
also test that 64 bit integers are properly handled
2018-04-23Merge #12885: Reduce implementation code inside CScriptWladimir J. van der Laan
54a5a21 [MOVEONLY] Turn CScript::GetOp2 into a function and move to cpp (Pieter Wuille) 6a7456a [MOVEONLY] Move CSCript::FindAndDelete to interpreter (Pieter Wuille) 33a8ecf Delete unused non-const-iterator CSCript::GetOp overloads (Pieter Wuille) 2fb168b Make iterators in CScript::FindAndDelete const (Pieter Wuille) Pull request description: This PR moves `FindAndDelete` and `GetOp2` out of CScript (the first is only used inside the interpreter and moved there, the second does not actually depend on any script specifics and works on any vector). Furthermore, all non-const-iterator versions of GetOp are replaced by const ones, removing a number of methods in the process. The longer term goal here is making the script interpreter independent from the CScript representation. Note for reviewers: both `FindAndDelete` and `GetScriptOp` are consensus critical. Tree-SHA512: c4ccf91c0b33c37cff0d474aa8dd2dab25b5b7655e2ed69a9b15e29daf0a67b21d51c23e1defb3a72ec762bd6138de96f69c6db1fb9c1fe1e976e421261aedb7
2018-04-23Merge #13052: trivial: Fix relevent typoMarcoFalke
6ad47b04b9 trivial: Fix relevent typo (practicalswift) Pull request description: Fix relevent typo. Tree-SHA512: 29247a780ab2caf0180c3558632a00068b02b4de4a56825f425c66a1e515542ab1e5268971ffa9a63e46840504101b5e6a5f8dcb6070522ac3f5ca90a28262b9
2018-04-22trivial: Fix relevent typopracticalswift
2018-04-19Do not treat bare multisig as IsMinePieter Wuille
Such outputs can still be watched, and signed for, but they aren't treated as valid payments. That means they won't cause transactions to appear in listtransactions, their outputs to be shown under listunspent, or affect balances.
2018-04-18Consistently log CValidationState on failureBen Woosley
Seems providing at least minimal visibility to the failure is a good practice. The only remaining ignored state is in LoadExternalBlockFile, where logging would likely be spammy.
2018-04-17Merge #12949: tests: Avoid copies of CTransactionMarcoFalke
fae58eca93 tests: Avoid copies of CTransaction (MarcoFalke) Pull request description: Avoid the copy (or move) constructor of `CTransaction` in test code, whereever a simple reference can be used instead. Tree-SHA512: 8ef2077a277d6182996f4671722fdc01a90909ae7431c1e52604aab8ed028910615028caf9b4cb07a9b15fdc04939dea2209cc3189dde7d38271256d9fe1076c
2018-04-16Merge #11862: Network specific conf sectionsWladimir J. van der Laan
c25321f Add config changes to release notes (Anthony Towns) 5e3cbe0 [tests] Unit tests for -testnet/-regtest in [test]/[regtest] sections (Anthony Towns) 005ad26 ArgsManager: special handling for -regtest and -testnet (Anthony Towns) 608415d [tests] Unit tests for network-specific config entries (Anthony Towns) 68797e2 ArgsManager: Warn when ignoring network-specific config setting (Anthony Towns) d1fc4d9 ArgsManager: limit some options to only apply on mainnet when in default section (Anthony Towns) 8a9817d [tests] Use regtest section in functional tests configs (Anthony Towns) 30f9407 [tests] Unit tests for config file sections (Anthony Towns) 95eb66d ArgsManager: support config file sections (Anthony Towns) 4d34fcc ArgsManager: drop m_negated_args (Anthony Towns) 3673ca3 ArgsManager: keep command line and config file arguments separate (Anthony Towns) Pull request description: The weekly meeting on [2017-12-07](http://www.erisian.com.au/meetbot/bitcoin-core-dev/2017/bitcoin-core-dev.2017-12-07-19.00.log.html) discussed allowing options to bitcoin to have some sensitivity to what network is in use. @theuni suggested having sections in the config file: <cfields> an alternative to that would be sections in a config file. and on the cmdline they'd look like namespaces. so, [testnet] port=5. or -testnet::port=5. This approach is (more or less) supported by `boost::program_options::detail::config_file_iterator` -- when it sees a `[testnet]` section with `port=5`, it will treat that the same as "testnet.port=5". So `[testnet] port=5` (or `testnet.port=5` without the section header) in bitcoin.conf and `-testnet.port=5` on the command line. The other aspect to this question is possibly limiting some options so that there is no possibility of accidental cross-contamination across networks. For example, if you're using a particular wallet.dat on mainnet, you may not want to accidentally use the same wallet on testnet and risk reusing keys. I've set this up so that the `-addnode` and `-wallet` options are `NETWORK_ONLY`, so that if you have a bitcoin.conf: wallet=/secret/wallet.dat upnp=1 and you run `bitcoind -testnet` or `bitcoind -regtest`, then the `wallet=` setting will be ignored, and should behave as if your bitcoin.conf had specified: upnp=1 [main] wallet=/secret/wallet.dat For any `NETWORK_ONLY` options, if you're using `-testnet` or `-regtest`, you'll have to add the prefix to any command line options. This was necessary for `multiwallet.py` for instance. I've left the "default" options as taking precedence over network specific ones, which might be backwards. So if you have: maxmempool=200 [regtest] maxmempool=100 your maxmempool will still be 200 on regtest. The advantage of doing it this way is that if you have `[regtest] maxmempool=100` in bitcoin.conf, and then say `bitcoind -regtest -maxmempool=200`, the same result is probably in line with what you expect... The other thing to note is that I'm using the chain names from `chainparamsbase.cpp` / `ChainNameFromCommandLine`, so the sections are `[main]`, `[test]` and `[regtest]`; not `[mainnet]` or `[testnet]` as might be expected. Thoughts? Ping @MeshCollider @laanwj @jonasschnelli @morcos Tree-SHA512: f00b5eb75f006189987e5c15e154a42b66ee251777768c1e185d764279070fcb7c41947d8794092b912a03d985843c82e5189871416995436a6260520fb7a4db
2018-04-13[MOVEONLY] Move CSCript::FindAndDelete to interpreterPieter Wuille
2018-04-13Avoid std::locale/imbue in DateTimeStrFormatPieter Wuille
2018-04-12Tighten up bech32::Decode(); add tests.murrayn
2018-04-12Merge #12803: Make BaseSignatureCreator a pure interfaceWladimir J. van der Laan
be67831 Make DummySignatureCreator a singleton (Pieter Wuille) 190b8d2 Make BaseSignatureCreator a pure interface (Pieter Wuille) Pull request description: * Removes the `m_provider` field from `BaseSignatureCreator`. Instead both a `SigningProvider` (which provides keys and scripts) and a `BaseSignatureCreator` (which implements the transaction-specific (or other) signing logic) are passed into and down in `ProduceSignature`, making the two concepts orthogonal. * Makes `BaseSignatureCreator` a pure interface without constructor, making it easier to implement new derivations of it (for example for message signing). * As `DummySignatureCreator` now becomes a stateless object, turn it into a singleton `DUMMY_SIGNATURE_CREATOR`. Tree-SHA512: 5f1f4512e4ea7d02a31df7b9ede55008efa716c5b74a2630ca1c2fc6599584d8bf5f5641487266127f4b3788033803539fbd22b03ef1219c83c10da2d3da3dcd
2018-04-12Fix dead stores. Values were stored but never read. Limit scope.practicalswift
2018-04-11tests: Avoid copies of CTransactionMarcoFalke
2018-04-11[tests] Unit tests for -testnet/-regtest in [test]/[regtest] sectionsAnthony Towns