1 files changed, 152 insertions, 0 deletions
diff --git a/src/script/ismine.cpp b/src/script/ismine.cpp
new file mode 100644
index 000000000..35d794b98
--- /dev/null
+++ b/src/script/ismine.cpp
@@ -0,0 +1,152 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <script/ismine.h>
+
+#include <key.h>
+#include <keystore.h>
+#include <script/script.h>
+#include <script/sign.h>
+
+
+typedef std::vector<unsigned char> valtype;
+
+static bool HaveKeys(const std::vector<valtype>& pubkeys, const CKeyStore& keystore)
+{
+    for (const valtype& pubkey : pubkeys) {
+        CKeyID keyID = CPubKey(pubkey).GetID();
+        if (!keystore.HaveKey(keyID)) return false;
+    }
+    return true;
+}
+
+isminetype IsMine(const CKeyStore& keystore, const CScript& scriptPubKey, SigVersion sigversion)
+{
+    bool isInvalid = false;
+    return IsMine(keystore, scriptPubKey, isInvalid, sigversion);
+}
+
+isminetype IsMine(const CKeyStore& keystore, const CTxDestination& dest, SigVersion sigversion)
+{
+    bool isInvalid = false;
+    return IsMine(keystore, dest, isInvalid, sigversion);
+}
+
+isminetype IsMine(const CKeyStore &keystore, const CTxDestination& dest, bool& isInvalid, SigVersion sigversion)
+{
+    CScript script = GetScriptForDestination(dest);
+    return IsMine(keystore, script, isInvalid, sigversion);
+}
+
+isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey, bool& isInvalid, SigVersion sigversion)
+{
+    isInvalid = false;
+
+    std::vector<valtype> vSolutions;
+    txnouttype whichType;
+    if (!Solver(scriptPubKey, whichType, vSolutions)) {
+        if (keystore.HaveWatchOnly(scriptPubKey))
+            return ISMINE_WATCH_UNSOLVABLE;
+        return ISMINE_NO;
+    }
+
+    CKeyID keyID;
+    switch (whichType)
+    {
+    case TX_NONSTANDARD:
+    case TX_NULL_DATA:
+    case TX_WITNESS_UNKNOWN:
+        break;
+    case TX_PUBKEY:
+        keyID = CPubKey(vSolutions[0]).GetID();
+        if (sigversion != SIGVERSION_BASE && vSolutions[0].size() != 33) {
+            isInvalid = true;
+            return ISMINE_NO;
+        }
+        if (keystore.HaveKey(keyID))
+            return ISMINE_SPENDABLE;
+        break;
+    case TX_WITNESS_V0_KEYHASH:
+    {
+        if (!keystore.HaveCScript(CScriptID(CScript() << OP_0 << vSolutions[0]))) {
+            // We do not support bare witness outputs unless the P2SH version of it would be
+            // acceptable as well. This protects against matching before segwit activates.
+            // This also applies to the P2WSH case.
+            break;
+        }
+        isminetype ret = ::IsMine(keystore, GetScriptForDestination(CKeyID(uint160(vSolutions[0]))), isInvalid, SIGVERSION_WITNESS_V0);
+        if (ret == ISMINE_SPENDABLE || ret == ISMINE_WATCH_SOLVABLE || (ret == ISMINE_NO && isInvalid))
+            return ret;
+        break;
+    }
+    case TX_PUBKEYHASH:
+        keyID = CKeyID(uint160(vSolutions[0]));
+        if (sigversion != SIGVERSION_BASE) {
+            CPubKey pubkey;
+            if (keystore.GetPubKey(keyID, pubkey) && !pubkey.IsCompressed()) {
+                isInvalid = true;
+                return ISMINE_NO;
+            }
+        }
+        if (keystore.HaveKey(keyID))
+            return ISMINE_SPENDABLE;
+        break;
+    case TX_SCRIPTHASH:
+    {
+        CScriptID scriptID = CScriptID(uint160(vSolutions[0]));
+        CScript subscript;
+        if (keystore.GetCScript(scriptID, subscript)) {
+            isminetype ret = IsMine(keystore, subscript, isInvalid);
+            if (ret == ISMINE_SPENDABLE || ret == ISMINE_WATCH_SOLVABLE || (ret == ISMINE_NO && isInvalid))
+                return ret;
+        }
+        break;
+    }
+    case TX_WITNESS_V0_SCRIPTHASH:
+    {
+        if (!keystore.HaveCScript(CScriptID(CScript() << OP_0 << vSolutions[0]))) {
+            break;
+        }
+        uint160 hash;
+        CRIPEMD160().Write(&vSolutions[0][0], vSolutions[0].size()).Finalize(hash.begin());
+        CScriptID scriptID = CScriptID(hash);
+        CScript subscript;
+        if (keystore.GetCScript(scriptID, subscript)) {
+            isminetype ret = IsMine(keystore, subscript, isInvalid, SIGVERSION_WITNESS_V0);
+            if (ret == ISMINE_SPENDABLE || ret == ISMINE_WATCH_SOLVABLE || (ret == ISMINE_NO && isInvalid))
+                return ret;
+        }
+        break;
+    }
+
+    case TX_MULTISIG:
+    {
+        // Only consider transactions "mine" if we own ALL the
+        // keys involved. Multi-signature transactions that are
+        // partially owned (somebody else has a key that can spend
+        // them) enable spend-out-from-under-you attacks, especially
+        // in shared-wallet situations.
+        std::vector<valtype> keys(vSolutions.begin()+1, vSolutions.begin()+vSolutions.size()-1);
+        if (sigversion != SIGVERSION_BASE) {
+            for (size_t i = 0; i < keys.size(); i++) {
+                if (keys[i].size() != 33) {
+                    isInvalid = true;
+                    return ISMINE_NO;
+                }
+            }
+        }
+        if (HaveKeys(keys, keystore))
+            return ISMINE_SPENDABLE;
+        break;
+    }
+    }
+
+    if (keystore.HaveWatchOnly(scriptPubKey)) {
+        // TODO: This could be optimized some by doing some work after the above solver
+        SignatureData sigs;
+        return ProduceSignature(DummySignatureCreator(&keystore), scriptPubKey, sigs) ? ISMINE_WATCH_SOLVABLE : ISMINE_WATCH_UNSOLVABLE;
+    }
+    return ISMINE_NO;
+}