diff options
| -rw-r--r-- | src/script/descriptor.cpp | 48 | ||||
| -rw-r--r-- | src/script/descriptor.h | 8 |
2 files changed, 48 insertions, 8 deletions
diff --git a/src/script/descriptor.cpp b/src/script/descriptor.cpp index 9be87fabb0..50119ba184 100644 --- a/src/script/descriptor.cpp +++ b/src/script/descriptor.cpp @@ -164,6 +164,9 @@ struct PubkeyProvider /** Get the descriptor string form including private data (if available in arg). */ virtual bool ToPrivateString(const SigningProvider& arg, std::string& out) const = 0; + + /** Derive a private key, if private data is available in arg. */ + virtual bool GetPrivKey(int pos, const SigningProvider& arg, CKey& key) const = 0; }; class OriginPubkeyProvider final : public PubkeyProvider @@ -195,6 +198,10 @@ public: ret = "[" + OriginString() + "]" + std::move(sub); return true; } + bool GetPrivKey(int pos, const SigningProvider& arg, CKey& key) const override + { + return m_provider->GetPrivKey(pos, arg, key); + } }; /** An object representing a parsed constant public key in a descriptor. */ @@ -222,6 +229,10 @@ public: ret = EncodeSecret(key); return true; } + bool GetPrivKey(int pos, const SigningProvider& arg, CKey& key) const override + { + return arg.GetKey(m_pubkey.GetID(), key); + } }; enum class DeriveType { @@ -266,14 +277,9 @@ public: { if (key) { if (IsHardened()) { - CExtKey extkey; - if (!GetExtKey(arg, extkey)) return false; - for (auto entry : m_path) { - extkey.Derive(extkey, entry); - } - if (m_derive == DeriveType::UNHARDENED) extkey.Derive(extkey, pos); - if (m_derive == DeriveType::HARDENED) extkey.Derive(extkey, pos | 0x80000000UL); - *key = extkey.Neuter().pubkey; + CKey priv_key; + if (!GetPrivKey(pos, arg, priv_key)) return false; + *key = priv_key.GetPubKey(); } else { // TODO: optimize by caching CExtPubKey extkey = m_extkey; @@ -312,6 +318,18 @@ public: } return true; } + bool GetPrivKey(int pos, const SigningProvider& arg, CKey& key) const override + { + CExtKey extkey; + if (!GetExtKey(arg, extkey)) return false; + for (auto entry : m_path) { + extkey.Derive(extkey, entry); + } + if (m_derive == DeriveType::UNHARDENED) extkey.Derive(extkey, pos); + if (m_derive == DeriveType::HARDENED) extkey.Derive(extkey, pos | 0x80000000UL); + key = extkey.key; + return true; + } }; /** Base class for all Descriptor implementations. */ @@ -462,6 +480,20 @@ public: Span<const unsigned char> span = MakeSpan(cache); return ExpandHelper(pos, DUMMY_SIGNING_PROVIDER, &span, output_scripts, out, nullptr) && span.size() == 0; } + + void ExpandPrivate(int pos, const SigningProvider& provider, FlatSigningProvider& out) const final + { + for (const auto& p : m_pubkey_args) { + CKey key; + if (!p->GetPrivKey(pos, provider, key)) continue; + out.keys.emplace(key.GetPubKey().GetID(), key); + } + if (m_script_arg) { + FlatSigningProvider subprovider; + m_script_arg->ExpandPrivate(pos, provider, subprovider); + out = Merge(out, subprovider); + } + } }; /** Construct a vector with one element, which is moved into it. */ diff --git a/src/script/descriptor.h b/src/script/descriptor.h index 907a102284..af7ae229ca 100644 --- a/src/script/descriptor.h +++ b/src/script/descriptor.h @@ -60,6 +60,14 @@ struct Descriptor { * out: scripts and public keys necessary for solving the expanded scriptPubKeys will be put here (may be equal to provider). */ virtual bool ExpandFromCache(int pos, const std::vector<unsigned char>& cache, std::vector<CScript>& output_scripts, FlatSigningProvider& out) const = 0; + + /** Expand the private key for a descriptor at a specified position, if possible. + * + * pos: the position at which to expand the descriptor. If IsRange() is false, this is ignored. + * provider: the provider to query for the private keys. + * out: any private keys available for the specified pos will be placed here. + */ + virtual void ExpandPrivate(int pos, const SigningProvider& provider, FlatSigningProvider& out) const = 0; }; /** Parse a descriptor string. Included private keys are put in out. |