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-rw-r--r--src/script/interpreter.cpp86
-rw-r--r--src/script/interpreter.h11
-rw-r--r--src/script/script.h12
-rw-r--r--src/script/script_error.h2
4 files changed, 108 insertions, 3 deletions
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index 265131ae0d..149a4f0156 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -373,7 +373,44 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, un
break;
}
- case OP_NOP1: case OP_NOP3: case OP_NOP4: case OP_NOP5:
+ case OP_CHECKSEQUENCEVERIFY:
+ {
+ if (!(flags & SCRIPT_VERIFY_CHECKSEQUENCEVERIFY)) {
+ // not enabled; treat as a NOP3
+ if (flags & SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS) {
+ return set_error(serror, SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS);
+ }
+ break;
+ }
+
+ if (stack.size() < 1)
+ return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+
+ // nSequence, like nLockTime, is a 32-bit unsigned integer
+ // field. See the comment in CHECKLOCKTIMEVERIFY regarding
+ // 5-byte numeric operands.
+ const CScriptNum nSequence(stacktop(-1), fRequireMinimal, 5);
+
+ // In the rare event that the argument may be < 0 due to
+ // some arithmetic being done first, you can always use
+ // 0 MAX CHECKSEQUENCEVERIFY.
+ if (nSequence < 0)
+ return set_error(serror, SCRIPT_ERR_NEGATIVE_LOCKTIME);
+
+ // To provide for future soft-fork extensibility, if the
+ // operand has the disabled lock-time flag set,
+ // CHECKSEQUENCEVERIFY behaves as a NOP.
+ if ((nSequence & CTxIn::SEQUENCE_LOCKTIME_DISABLE_FLAG) != 0)
+ break;
+
+ // Compare the specified sequence number with the input.
+ if (!checker.CheckSequence(nSequence))
+ return set_error(serror, SCRIPT_ERR_UNSATISFIED_LOCKTIME);
+
+ break;
+ }
+
+ case OP_NOP1: case OP_NOP4: case OP_NOP5:
case OP_NOP6: case OP_NOP7: case OP_NOP8: case OP_NOP9: case OP_NOP10:
{
if (flags & SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS)
@@ -1150,12 +1187,57 @@ bool TransactionSignatureChecker::CheckLockTime(const CScriptNum& nLockTime) con
// prevent this condition. Alternatively we could test all
// inputs, but testing just this input minimizes the data
// required to prove correct CHECKLOCKTIMEVERIFY execution.
- if (txTo->vin[nIn].IsFinal())
+ if (CTxIn::SEQUENCE_FINAL == txTo->vin[nIn].nSequence)
return false;
return true;
}
+bool TransactionSignatureChecker::CheckSequence(const CScriptNum& nSequence) const
+{
+ // Relative lock times are supported by comparing the passed
+ // in operand to the sequence number of the input.
+ const int64_t txToSequence = (int64_t)txTo->vin[nIn].nSequence;
+
+ // Fail if the transaction's version number is not set high
+ // enough to trigger BIP 68 rules.
+ if (static_cast<uint32_t>(txTo->nVersion) < 2)
+ return false;
+
+ // Sequence numbers with their most significant bit set are not
+ // consensus constrained. Testing that the transaction's sequence
+ // number do not have this bit set prevents using this property
+ // to get around a CHECKSEQUENCEVERIFY check.
+ if (txToSequence & CTxIn::SEQUENCE_LOCKTIME_DISABLE_FLAG)
+ return false;
+
+ // Mask off any bits that do not have consensus-enforced meaning
+ // before doing the integer comparisons
+ const uint32_t nLockTimeMask = CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG | CTxIn::SEQUENCE_LOCKTIME_MASK;
+ const int64_t txToSequenceMasked = txToSequence & nLockTimeMask;
+ const CScriptNum nSequenceMasked = nSequence & nLockTimeMask;
+
+ // There are two kinds of nSequence: lock-by-blockheight
+ // and lock-by-blocktime, distinguished by whether
+ // nSequenceMasked < CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG.
+ //
+ // We want to compare apples to apples, so fail the script
+ // unless the type of nSequenceMasked being tested is the same as
+ // the nSequenceMasked in the transaction.
+ if (!(
+ (txToSequenceMasked < CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG && nSequenceMasked < CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG) ||
+ (txToSequenceMasked >= CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG && nSequenceMasked >= CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG)
+ )) {
+ return false;
+ }
+
+ // Now that we know we're comparing apples-to-apples, the
+ // comparison is a simple numeric one.
+ if (nSequenceMasked > txToSequenceMasked)
+ return false;
+
+ return true;
+}
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror)
{
diff --git a/src/script/interpreter.h b/src/script/interpreter.h
index 7b34547ffb..e5cb7290f2 100644
--- a/src/script/interpreter.h
+++ b/src/script/interpreter.h
@@ -81,6 +81,11 @@ enum
//
// See BIP65 for details.
SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY = (1U << 9),
+
+ // support CHECKSEQUENCEVERIFY opcode
+ //
+ // See BIP112 for details
+ SCRIPT_VERIFY_CHECKSEQUENCEVERIFY = (1U << 10),
};
bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);
@@ -100,6 +105,11 @@ public:
return false;
}
+ virtual bool CheckSequence(const CScriptNum& nSequence) const
+ {
+ return false;
+ }
+
virtual ~BaseSignatureChecker() {}
};
@@ -116,6 +126,7 @@ public:
TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn) : txTo(txToIn), nIn(nInIn) {}
bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode) const;
bool CheckLockTime(const CScriptNum& nLockTime) const;
+ bool CheckSequence(const CScriptNum& nSequence) const;
};
class MutableTransactionSignatureChecker : public TransactionSignatureChecker
diff --git a/src/script/script.h b/src/script/script.h
index 6551eea30d..d2a68a07ba 100644
--- a/src/script/script.h
+++ b/src/script/script.h
@@ -165,6 +165,7 @@ enum opcodetype
OP_CHECKLOCKTIMEVERIFY = 0xb1,
OP_NOP2 = OP_CHECKLOCKTIMEVERIFY,
OP_NOP3 = 0xb2,
+ OP_CHECKSEQUENCEVERIFY = OP_NOP3,
OP_NOP4 = 0xb3,
OP_NOP5 = 0xb4,
OP_NOP6 = 0xb5,
@@ -259,6 +260,11 @@ public:
inline CScriptNum& operator+=( const CScriptNum& rhs) { return operator+=(rhs.m_value); }
inline CScriptNum& operator-=( const CScriptNum& rhs) { return operator-=(rhs.m_value); }
+ inline CScriptNum operator&( const int64_t& rhs) const { return CScriptNum(m_value & rhs);}
+ inline CScriptNum operator&( const CScriptNum& rhs) const { return operator&(rhs.m_value); }
+
+ inline CScriptNum& operator&=( const CScriptNum& rhs) { return operator&=(rhs.m_value); }
+
inline CScriptNum operator-() const
{
assert(m_value != std::numeric_limits<int64_t>::min());
@@ -287,6 +293,12 @@ public:
return *this;
}
+ inline CScriptNum& operator&=( const int64_t& rhs)
+ {
+ m_value &= rhs;
+ return *this;
+ }
+
int getint() const
{
if (m_value > std::numeric_limits<int>::max())
diff --git a/src/script/script_error.h b/src/script/script_error.h
index bb10b8a293..26df33932f 100644
--- a/src/script/script_error.h
+++ b/src/script/script_error.h
@@ -35,7 +35,7 @@ typedef enum ScriptError_t
SCRIPT_ERR_INVALID_ALTSTACK_OPERATION,
SCRIPT_ERR_UNBALANCED_CONDITIONAL,
- /* OP_CHECKLOCKTIMEVERIFY */
+ /* CHECKLOCKTIMEVERIFY and CHECKSEQUENCEVERIFY */
SCRIPT_ERR_NEGATIVE_LOCKTIME,
SCRIPT_ERR_UNSATISFIED_LOCKTIME,
generated by cgit v1.2.3 (git 2.26.2) at 2024-07-19 09:05:56 +0000