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-rw-r--r--src/script/interpreter.cpp104
1 files changed, 22 insertions, 82 deletions
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index fd3e4f1ff7..56140f19db 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -9,14 +9,10 @@
#include "crypto/ripemd160.h"
#include "crypto/sha1.h"
#include "crypto/sha2.h"
-#include "random.h"
#include "script/script.h"
#include "uint256.h"
#include "util.h"
-#include <boost/thread.hpp>
-#include <boost/tuple/tuple_comparison.hpp>
-
using namespace std;
typedef vector<unsigned char> valtype;
@@ -132,7 +128,7 @@ bool IsCanonicalSignature(const valtype &vchSig, unsigned int flags) {
return true;
}
-bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags)
+bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker)
{
CScript::const_iterator pc = script.begin();
CScript::const_iterator pend = script.end();
@@ -637,19 +633,19 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
valtype& vch = stacktop(-1);
valtype vchHash((opcode == OP_RIPEMD160 || opcode == OP_SHA1 || opcode == OP_HASH160) ? 20 : 32);
if (opcode == OP_RIPEMD160)
- CRIPEMD160().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+ CRIPEMD160().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
else if (opcode == OP_SHA1)
- CSHA1().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+ CSHA1().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
else if (opcode == OP_SHA256)
- CSHA256().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+ CSHA256().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
else if (opcode == OP_HASH160)
- CHash160().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+ CHash160().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
else if (opcode == OP_HASH256)
- CHash256().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+ CHash256().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
popstack(stack);
stack.push_back(vchHash);
}
- break;
+ break;
case OP_CODESEPARATOR:
{
@@ -675,7 +671,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
scriptCode.FindAndDelete(CScript(vchSig));
bool fSuccess = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) &&
- CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, flags);
+ checker.CheckSig(vchSig, vchPubKey, scriptCode);
popstack(stack);
popstack(stack);
@@ -736,7 +732,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
// Check signature
bool fOk = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) &&
- CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, flags);
+ checker.CheckSig(vchSig, vchPubKey, scriptCode);
if (fOk) {
isig++;
@@ -839,7 +835,8 @@ public:
itBegin = it;
}
}
- s.write((char*)&itBegin[0], it-itBegin);
+ if (itBegin != scriptCode.end())
+ s.write((char*)&itBegin[0], it-itBegin);
}
/** Serialize an input of txTo */
@@ -896,7 +893,7 @@ public:
} // anon namespace
-uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
+uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
{
if (nIn >= txTo.vin.size()) {
LogPrintf("ERROR: SignatureHash() : nIn=%d out of range\n", nIn);
@@ -920,70 +917,19 @@ uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsig
return ss.GetHash();
}
-// Valid signature cache, to avoid doing expensive ECDSA signature checking
-// twice for every transaction (once when accepted into memory pool, and
-// again when accepted into the block chain)
-class CSignatureCache
+bool SignatureChecker::VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& pubkey, const uint256& sighash) const
{
-private:
- // sigdata_type is (signature hash, signature, public key):
- typedef boost::tuple<uint256, std::vector<unsigned char>, CPubKey> sigdata_type;
- std::set< sigdata_type> setValid;
- boost::shared_mutex cs_sigcache;
-
-public:
- bool
- Get(const uint256 &hash, const std::vector<unsigned char>& vchSig, const CPubKey& pubKey)
- {
- boost::shared_lock<boost::shared_mutex> lock(cs_sigcache);
-
- sigdata_type k(hash, vchSig, pubKey);
- std::set<sigdata_type>::iterator mi = setValid.find(k);
- if (mi != setValid.end())
- return true;
- return false;
- }
-
- void Set(const uint256 &hash, const std::vector<unsigned char>& vchSig, const CPubKey& pubKey)
- {
- // DoS prevention: limit cache size to less than 10MB
- // (~200 bytes per cache entry times 50,000 entries)
- // Since there are a maximum of 20,000 signature operations per block
- // 50,000 is a reasonable default.
- int64_t nMaxCacheSize = GetArg("-maxsigcachesize", 50000);
- if (nMaxCacheSize <= 0) return;
-
- boost::unique_lock<boost::shared_mutex> lock(cs_sigcache);
-
- while (static_cast<int64_t>(setValid.size()) > nMaxCacheSize)
- {
- // Evict a random entry. Random because that helps
- // foil would-be DoS attackers who might try to pre-generate
- // and re-use a set of valid signatures just-slightly-greater
- // than our cache size.
- uint256 randomHash = GetRandHash();
- std::vector<unsigned char> unused;
- std::set<sigdata_type>::iterator it =
- setValid.lower_bound(sigdata_type(randomHash, unused, unused));
- if (it == setValid.end())
- it = setValid.begin();
- setValid.erase(*it);
- }
-
- sigdata_type k(hash, vchSig, pubKey);
- setValid.insert(k);
- }
-};
+ return pubkey.Verify(sighash, vchSig);
+}
-bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char>& vchPubKey, const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int flags)
+bool SignatureChecker::CheckSig(const vector<unsigned char>& vchSigIn, const vector<unsigned char>& vchPubKey, const CScript& scriptCode) const
{
- static CSignatureCache signatureCache;
-
CPubKey pubkey(vchPubKey);
if (!pubkey.IsValid())
return false;
// Hash type is one byte tacked on to the end of the signature
+ vector<unsigned char> vchSig(vchSigIn);
if (vchSig.empty())
return false;
int nHashType = vchSig.back();
@@ -991,26 +937,20 @@ bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char>& vchPubK
uint256 sighash = SignatureHash(scriptCode, txTo, nIn, nHashType);
- if (signatureCache.Get(sighash, vchSig, pubkey))
- return true;
-
- if (!pubkey.Verify(sighash, vchSig))
+ if (!VerifySignature(vchSig, pubkey, sighash))
return false;
- if (!(flags & SCRIPT_VERIFY_NOCACHE))
- signatureCache.Set(sighash, vchSig, pubkey);
-
return true;
}
-bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags)
+bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, unsigned int flags, const BaseSignatureChecker& checker)
{
vector<vector<unsigned char> > stack, stackCopy;
- if (!EvalScript(stack, scriptSig, txTo, nIn, flags))
+ if (!EvalScript(stack, scriptSig, flags, checker))
return false;
if (flags & SCRIPT_VERIFY_P2SH)
stackCopy = stack;
- if (!EvalScript(stack, scriptPubKey, txTo, nIn, flags))
+ if (!EvalScript(stack, scriptPubKey, flags, checker))
return false;
if (stack.empty())
return false;
@@ -1033,7 +973,7 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C
CScript pubKey2(pubKeySerialized.begin(), pubKeySerialized.end());
popstack(stackCopy);
- if (!EvalScript(stackCopy, pubKey2, txTo, nIn, flags))
+ if (!EvalScript(stackCopy, pubKey2, flags, checker))
return false;
if (stackCopy.empty())
return false;
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-10 17:06:28 +0000