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-rw-r--r--src/script/descriptor.cpp86
-rw-r--r--src/script/descriptor.h21
-rw-r--r--src/script/sign.h5
3 files changed, 111 insertions, 1 deletions
diff --git a/src/script/descriptor.cpp b/src/script/descriptor.cpp
index d343972c40..ca80d3451f 100644
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -211,6 +211,7 @@ public:
AddressDescriptor(CTxDestination destination) : m_destination(std::move(destination)) {}
bool IsRange() const override { return false; }
+ bool IsSolvable() const override { return false; }
std::string ToString() const override { return "addr(" + EncodeDestination(m_destination) + ")"; }
bool ToPrivateString(const SigningProvider& arg, std::string& out) const override { out = ToString(); return true; }
bool Expand(int pos, const SigningProvider& arg, std::vector<CScript>& output_scripts, FlatSigningProvider& out) const override
@@ -229,6 +230,7 @@ public:
RawDescriptor(CScript script) : m_script(std::move(script)) {}
bool IsRange() const override { return false; }
+ bool IsSolvable() const override { return false; }
std::string ToString() const override { return "raw(" + HexStr(m_script.begin(), m_script.end()) + ")"; }
bool ToPrivateString(const SigningProvider& arg, std::string& out) const override { out = ToString(); return true; }
bool Expand(int pos, const SigningProvider& arg, std::vector<CScript>& output_scripts, FlatSigningProvider& out) const override
@@ -249,6 +251,7 @@ public:
SingleKeyDescriptor(std::unique_ptr<PubkeyProvider> prov, const std::function<CScript(const CPubKey&)>& fn, const std::string& name) : m_script_fn(fn), m_fn_name(name), m_provider(std::move(prov)) {}
bool IsRange() const override { return m_provider->IsRange(); }
+ bool IsSolvable() const override { return true; }
std::string ToString() const override { return m_fn_name + "(" + m_provider->ToString() + ")"; }
bool ToPrivateString(const SigningProvider& arg, std::string& out) const override
{
@@ -290,6 +293,8 @@ public:
return false;
}
+ bool IsSolvable() const override { return true; }
+
std::string ToString() const override
{
std::string ret = strprintf("multi(%i", m_threshold);
@@ -343,6 +348,7 @@ public:
ConvertorDescriptor(std::unique_ptr<Descriptor> descriptor, const std::function<CScript(const CScript&)>& fn, const std::string& name) : m_convert_fn(fn), m_fn_name(name), m_descriptor(std::move(descriptor)) {}
bool IsRange() const override { return m_descriptor->IsRange(); }
+ bool IsSolvable() const override { return m_descriptor->IsSolvable(); }
std::string ToString() const override { return m_fn_name + "(" + m_descriptor->ToString() + ")"; }
bool ToPrivateString(const SigningProvider& arg, std::string& out) const override
{
@@ -377,6 +383,7 @@ public:
ComboDescriptor(std::unique_ptr<PubkeyProvider> provider) : m_provider(std::move(provider)) {}
bool IsRange() const override { return m_provider->IsRange(); }
+ bool IsSolvable() const override { return true; }
std::string ToString() const override { return "combo(" + m_provider->ToString() + ")"; }
bool ToPrivateString(const SigningProvider& arg, std::string& out) const override
{
@@ -625,6 +632,80 @@ std::unique_ptr<Descriptor> ParseScript(Span<const char>& sp, ParseScriptContext
return nullptr;
}
+std::unique_ptr<PubkeyProvider> InferPubkey(const CPubKey& pubkey, ParseScriptContext, const SigningProvider& provider)
+{
+ std::unique_ptr<PubkeyProvider> key_provider = MakeUnique<ConstPubkeyProvider>(pubkey);
+ KeyOriginInfo info;
+ if (provider.GetKeyOrigin(pubkey.GetID(), info)) {
+ return MakeUnique<OriginPubkeyProvider>(std::move(info), std::move(key_provider));
+ }
+ return key_provider;
+}
+
+std::unique_ptr<Descriptor> InferScript(const CScript& script, ParseScriptContext ctx, const SigningProvider& provider)
+{
+ std::vector<std::vector<unsigned char>> data;
+ txnouttype txntype = Solver(script, data);
+
+ if (txntype == TX_PUBKEY) {
+ CPubKey pubkey(data[0].begin(), data[0].end());
+ if (pubkey.IsValid()) {
+ return MakeUnique<SingleKeyDescriptor>(InferPubkey(pubkey, ctx, provider), P2PKGetScript, "pk");
+ }
+ }
+ if (txntype == TX_PUBKEYHASH) {
+ uint160 hash(data[0]);
+ CKeyID keyid(hash);
+ CPubKey pubkey;
+ if (provider.GetPubKey(keyid, pubkey)) {
+ return MakeUnique<SingleKeyDescriptor>(InferPubkey(pubkey, ctx, provider), P2PKHGetScript, "pkh");
+ }
+ }
+ if (txntype == TX_WITNESS_V0_KEYHASH && ctx != ParseScriptContext::P2WSH) {
+ uint160 hash(data[0]);
+ CKeyID keyid(hash);
+ CPubKey pubkey;
+ if (provider.GetPubKey(keyid, pubkey)) {
+ return MakeUnique<SingleKeyDescriptor>(InferPubkey(pubkey, ctx, provider), P2WPKHGetScript, "wpkh");
+ }
+ }
+ if (txntype == TX_MULTISIG) {
+ std::vector<std::unique_ptr<PubkeyProvider>> providers;
+ for (size_t i = 1; i + 1 < data.size(); ++i) {
+ CPubKey pubkey(data[i].begin(), data[i].end());
+ providers.push_back(InferPubkey(pubkey, ctx, provider));
+ }
+ return MakeUnique<MultisigDescriptor>((int)data[0][0], std::move(providers));
+ }
+ if (txntype == TX_SCRIPTHASH && ctx == ParseScriptContext::TOP) {
+ uint160 hash(data[0]);
+ CScriptID scriptid(hash);
+ CScript subscript;
+ if (provider.GetCScript(scriptid, subscript)) {
+ auto sub = InferScript(subscript, ParseScriptContext::P2SH, provider);
+ if (sub) return MakeUnique<ConvertorDescriptor>(std::move(sub), ConvertP2SH, "sh");
+ }
+ }
+ if (txntype == TX_WITNESS_V0_SCRIPTHASH && ctx != ParseScriptContext::P2WSH) {
+ CScriptID scriptid;
+ CRIPEMD160().Write(data[0].data(), data[0].size()).Finalize(scriptid.begin());
+ CScript subscript;
+ if (provider.GetCScript(scriptid, subscript)) {
+ auto sub = InferScript(subscript, ParseScriptContext::P2WSH, provider);
+ if (sub) return MakeUnique<ConvertorDescriptor>(std::move(sub), ConvertP2WSH, "wsh");
+ }
+ }
+
+ CTxDestination dest;
+ if (ExtractDestination(script, dest)) {
+ if (GetScriptForDestination(dest) == script) {
+ return MakeUnique<AddressDescriptor>(std::move(dest));
+ }
+ }
+
+ return MakeUnique<RawDescriptor>(script);
+}
+
} // namespace
std::unique_ptr<Descriptor> Parse(const std::string& descriptor, FlatSigningProvider& out)
@@ -634,3 +715,8 @@ std::unique_ptr<Descriptor> Parse(const std::string& descriptor, FlatSigningProv
if (sp.size() == 0 && ret) return ret;
return nullptr;
}
+
+std::unique_ptr<Descriptor> InferDescriptor(const CScript& script, const SigningProvider& provider)
+{
+ return InferScript(script, ParseScriptContext::TOP, provider);
+}
diff --git a/src/script/descriptor.h b/src/script/descriptor.h
index 87e07369c7..0111972f85 100644
--- a/src/script/descriptor.h
+++ b/src/script/descriptor.h
@@ -32,6 +32,10 @@ struct Descriptor {
/** Whether the expansion of this descriptor depends on the position. */
virtual bool IsRange() const = 0;
+ /** Whether this descriptor has all information about signing ignoring lack of private keys.
+ * This is true for all descriptors except ones that use `raw` or `addr` constructions. */
+ virtual bool IsSolvable() const = 0;
+
/** Convert the descriptor back to a string, undoing parsing. */
virtual std::string ToString() const = 0;
@@ -51,5 +55,20 @@ struct Descriptor {
/** Parse a descriptor string. Included private keys are put in out. Returns nullptr if parsing fails. */
std::unique_ptr<Descriptor> Parse(const std::string& descriptor, FlatSigningProvider& out);
-#endif // BITCOIN_SCRIPT_DESCRIPTOR_H
+/** Find a descriptor for the specified script, using information from provider where possible.
+ *
+ * A non-ranged descriptor which only generates the specified script will be returned in all
+ * circumstances.
+ *
+ * For public keys with key origin information, this information will be preserved in the returned
+ * descriptor.
+ *
+ * - If all information for solving `script` is present in `provider`, a descriptor will be returned
+ * which is `IsSolvable()` and encapsulates said information.
+ * - Failing that, if `script` corresponds to a known address type, an "addr()" descriptor will be
+ * returned (which is not `IsSolvable()`).
+ * - Failing that, a "raw()" descriptor is returned.
+ */
+std::unique_ptr<Descriptor> InferDescriptor(const CScript& script, const SigningProvider& provider);
+#endif // BITCOIN_SCRIPT_DESCRIPTOR_H
diff --git a/src/script/sign.h b/src/script/sign.h
index a478f49789..20c7203b26 100644
--- a/src/script/sign.h
+++ b/src/script/sign.h
@@ -24,6 +24,11 @@ struct KeyOriginInfo
{
unsigned char fingerprint[4];
std::vector<uint32_t> path;
+
+ friend bool operator==(const KeyOriginInfo& a, const KeyOriginInfo& b)
+ {
+ return std::equal(std::begin(a.fingerprint), std::end(a.fingerprint), std::begin(b.fingerprint)) && a.path == b.path;
+ }
};
/** An interface to be implemented by keystores that support signing. */
generated by cgit v1.2.3 (git 2.26.2) at 2024-09-05 08:55:09 +0000