diff options
| author | Johnson Lau <jl2012@xbt.hk> | 2016-09-23 13:06:45 +0800 |
|---|---|---|
| committer | Johnson Lau <jl2012@xbt.hk> | 2016-09-23 13:07:38 +0800 |
| commit | c72c5b1e3bd42e84465677e94aa83316ff3d9a14 (patch) | |
| tree | 4b53ce9d63e5292b79e4699437ab69d38d17bcbd /src/script | |
| parent | 2b514aa2eae61839ad162b2f6e5ba69ef96c5c97 (diff) | |
| download | bitcoin-c72c5b1e3bd42e84465677e94aa83316ff3d9a14.tar.xz | |
Make non-minimal OP_IF/NOTIF argument non-standard for P2WSH
Diffstat (limited to 'src/script')
| -rw-r--r-- | src/script/interpreter.cpp | 6 | ||||
| -rw-r--r-- | src/script/interpreter.h | 4 | ||||
| -rw-r--r-- | src/script/script_error.cpp | 2 | ||||
| -rw-r--r-- | src/script/script_error.h | 3 |
4 files changed, 14 insertions, 1 deletions
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp index 47ea261e31..fd356fed0a 100644 --- a/src/script/interpreter.cpp +++ b/src/script/interpreter.cpp @@ -428,6 +428,12 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, un if (stack.size() < 1) return set_error(serror, SCRIPT_ERR_UNBALANCED_CONDITIONAL); valtype& vch = stacktop(-1); + if (sigversion == SIGVERSION_WITNESS_V0 && (flags & SCRIPT_VERIFY_MINIMALIF)) { + if (vch.size() > 1) + return set_error(serror, SCRIPT_ERR_MINIMALIF); + if (vch.size() == 1 && vch[0] != 1) + return set_error(serror, SCRIPT_ERR_MINIMALIF); + } fValue = CastToBool(vch); if (opcode == OP_NOTIF) fValue = !fValue; diff --git a/src/script/interpreter.h b/src/script/interpreter.h index e5d7865cd3..2ce4b23e54 100644 --- a/src/script/interpreter.h +++ b/src/script/interpreter.h @@ -94,6 +94,10 @@ enum // Making v1-v16 witness program non-standard // SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM = (1U << 12), + + // Segwit script only: Require the argument of OP_IF/NOTIF to be exactly 0x01 or empty vector + // + SCRIPT_VERIFY_MINIMALIF = (1U << 13), }; bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror); diff --git a/src/script/script_error.cpp b/src/script/script_error.cpp index cef807edcf..9969c232fc 100644 --- a/src/script/script_error.cpp +++ b/src/script/script_error.cpp @@ -63,6 +63,8 @@ const char* ScriptErrorString(const ScriptError serror) return "Non-canonical signature: S value is unnecessarily high"; case SCRIPT_ERR_SIG_NULLDUMMY: return "Dummy CHECKMULTISIG argument must be zero"; + case SCRIPT_ERR_MINIMALIF: + return "OP_IF/NOTIF argument must be minimal"; case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS: return "NOPx reserved for soft-fork upgrades"; case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM: diff --git a/src/script/script_error.h b/src/script/script_error.h index 09dc6945ad..6d34d37925 100644 --- a/src/script/script_error.h +++ b/src/script/script_error.h @@ -39,7 +39,7 @@ typedef enum ScriptError_t SCRIPT_ERR_NEGATIVE_LOCKTIME, SCRIPT_ERR_UNSATISFIED_LOCKTIME, - /* BIP62 */ + /* Malleability */ SCRIPT_ERR_SIG_HASHTYPE, SCRIPT_ERR_SIG_DER, SCRIPT_ERR_MINIMALDATA, @@ -48,6 +48,7 @@ typedef enum ScriptError_t SCRIPT_ERR_SIG_NULLDUMMY, SCRIPT_ERR_PUBKEYTYPE, SCRIPT_ERR_CLEANSTACK, + SCRIPT_ERR_MINIMALIF, /* softfork safeness */ SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS, |