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Make non-minimal OP_IF/NOTIF argument non-standard for P2WSH

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Github-Pull: #8526
Rebased-From: c72c5b1e3bd42e84465677e94aa83316ff3d9a14
This commit is contained in:
Johnson Lau
2016-09-23 13:06:45 +08:00
committed by Wladimir J. van der Laan
parent 633c4a1f36
commit 0027672c80
8 changed files with 101 additions and 2 deletions
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6
src/script/interpreter.cpp
View File

@@ -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;

4
src/script/interpreter.h
View File

@@ -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);

2
src/script/script_error.cpp
View File

@@ -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:

3
src/script/script_error.h
View File

@@ -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,