Merge bitcoin#23718: PSBT: hash preimages fields

a9256dc rpc: output all hash preimages in 'decodepsbt' (Antoine Poinsot)
4d6b532 psbt: implement hash preimages fields (Antoine Poinsot)

Pull request description:

  This implements the [bip174 input fields for hash preimages](https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki).
  One motivation is that we will need those once we implement signing support for Miniscript descriptors.

ACKs for top commit:
  achow101:
    ACK a9256dc
  Sjors:
    re-tACK a9256dc
  w0xlt:
    reACK a9256dc

Tree-SHA512: 145d39f7de86256d4174d063dcee217ea6f9ec7a138bbd5205941d17ca99dcccef0ace05f6d0d6a77dd863e3877b05e0752f2bc36ecd8c508e2c8adae2e03ae1

Author: MarcoFalke

src/psbt.cpp

@@ -153,6 +153,10 @@ void PSBTInput::Merge(const PSBTInput& input)
     }
 
     partial_sigs.insert(input.partial_sigs.begin(), input.partial_sigs.end());
+    ripemd160_preimages.insert(input.ripemd160_preimages.begin(), input.ripemd160_preimages.end());
+    sha256_preimages.insert(input.sha256_preimages.begin(), input.sha256_preimages.end());
+    hash160_preimages.insert(input.hash160_preimages.begin(), input.hash160_preimages.end());
+    hash256_preimages.insert(input.hash256_preimages.begin(), input.hash256_preimages.end());
     hd_keypaths.insert(input.hd_keypaths.begin(), input.hd_keypaths.end());
     unknown.insert(input.unknown.begin(), input.unknown.end());
 

src/psbt.h

@@ -37,6 +37,10 @@ static constexpr uint8_t PSBT_IN_WITNESSSCRIPT = 0x05;
 static constexpr uint8_t PSBT_IN_BIP32_DERIVATION = 0x06;
 static constexpr uint8_t PSBT_IN_SCRIPTSIG = 0x07;
 static constexpr uint8_t PSBT_IN_SCRIPTWITNESS = 0x08;
+static constexpr uint8_t PSBT_IN_RIPEMD160 = 0x0A;
+static constexpr uint8_t PSBT_IN_SHA256 = 0x0B;
+static constexpr uint8_t PSBT_IN_HASH160 = 0x0C;
+static constexpr uint8_t PSBT_IN_HASH256 = 0x0D;
 static constexpr uint8_t PSBT_IN_PROPRIETARY = 0xFC;
 
 // Output types
@@ -171,6 +175,10 @@ struct PSBTInput
     CScriptWitness final_script_witness;
     std::map<CPubKey, KeyOriginInfo> hd_keypaths;
     std::map<CKeyID, SigPair> partial_sigs;
+    std::map<uint160, std::vector<unsigned char>> ripemd160_preimages;
+    std::map<uint256, std::vector<unsigned char>> sha256_preimages;
+    std::map<uint160, std::vector<unsigned char>> hash160_preimages;
+    std::map<uint256, std::vector<unsigned char>> hash256_preimages;
     std::map<std::vector<unsigned char>, std::vector<unsigned char>> unknown;
     std::set<PSBTProprietary> m_proprietary;
     std::optional<int> sighash_type;
@@ -221,6 +229,30 @@ struct PSBTInput
 
             // Write any hd keypaths
             SerializeHDKeypaths(s, hd_keypaths, CompactSizeWriter(PSBT_IN_BIP32_DERIVATION));
+
+            // Write any ripemd160 preimage
+            for (const auto& [hash, preimage] : ripemd160_preimages) {
+                SerializeToVector(s, CompactSizeWriter(PSBT_IN_RIPEMD160), Span{hash});
+                s << preimage;
+            }
+
+            // Write any sha256 preimage
+            for (const auto& [hash, preimage] : sha256_preimages) {
+                SerializeToVector(s, CompactSizeWriter(PSBT_IN_SHA256), Span{hash});
+                s << preimage;
+            }
+
+            // Write any hash160 preimage
+            for (const auto& [hash, preimage] : hash160_preimages) {
+                SerializeToVector(s, CompactSizeWriter(PSBT_IN_HASH160), Span{hash});
+                s << preimage;
+            }
+
+            // Write any hash256 preimage
+            for (const auto& [hash, preimage] : hash256_preimages) {
+                SerializeToVector(s, CompactSizeWriter(PSBT_IN_HASH256), Span{hash});
+                s << preimage;
+            }
         }
 
         // Write script sig
@@ -373,6 +405,90 @@ struct PSBTInput
                     UnserializeFromVector(s, final_script_witness.stack);
                     break;
                 }
+                case PSBT_IN_RIPEMD160:
+                {
+                    // Make sure that the key is the size of a ripemd160 hash + 1
+                    if (key.size() != CRIPEMD160::OUTPUT_SIZE + 1) {
+                        throw std::ios_base::failure("Size of key was not the expected size for the type ripemd160 preimage");
+                    }
+                    // Read in the hash from key
+                    std::vector<unsigned char> hash_vec(key.begin() + 1, key.end());
+                    uint160 hash(hash_vec);
+                    if (ripemd160_preimages.count(hash) > 0) {
+                        throw std::ios_base::failure("Duplicate Key, input ripemd160 preimage already provided");
+                    }
+
+                    // Read in the preimage from value
+                    std::vector<unsigned char> preimage;
+                    s >> preimage;
+
+                    // Add to preimages list
+                    ripemd160_preimages.emplace(hash, std::move(preimage));
+                    break;
+                }
+                case PSBT_IN_SHA256:
+                {
+                    // Make sure that the key is the size of a sha256 hash + 1
+                    if (key.size() != CSHA256::OUTPUT_SIZE + 1) {
+                        throw std::ios_base::failure("Size of key was not the expected size for the type sha256 preimage");
+                    }
+                    // Read in the hash from key
+                    std::vector<unsigned char> hash_vec(key.begin() + 1, key.end());
+                    uint256 hash(hash_vec);
+                    if (sha256_preimages.count(hash) > 0) {
+                        throw std::ios_base::failure("Duplicate Key, input sha256 preimage already provided");
+                    }
+
+                    // Read in the preimage from value
+                    std::vector<unsigned char> preimage;
+                    s >> preimage;
+
+                    // Add to preimages list
+                    sha256_preimages.emplace(hash, std::move(preimage));
+                    break;
+                }
+                case PSBT_IN_HASH160:
+                {
+                    // Make sure that the key is the size of a hash160 hash + 1
+                    if (key.size() != CHash160::OUTPUT_SIZE + 1) {
+                        throw std::ios_base::failure("Size of key was not the expected size for the type hash160 preimage");
+                    }
+                    // Read in the hash from key
+                    std::vector<unsigned char> hash_vec(key.begin() + 1, key.end());
+                    uint160 hash(hash_vec);
+                    if (hash160_preimages.count(hash) > 0) {
+                        throw std::ios_base::failure("Duplicate Key, input hash160 preimage already provided");
+                    }
+
+                    // Read in the preimage from value
+                    std::vector<unsigned char> preimage;
+                    s >> preimage;
+
+                    // Add to preimages list
+                    hash160_preimages.emplace(hash, std::move(preimage));
+                    break;
+                }
+                case PSBT_IN_HASH256:
+                {
+                    // Make sure that the key is the size of a hash256 hash + 1
+                    if (key.size() != CHash256::OUTPUT_SIZE + 1) {
+                        throw std::ios_base::failure("Size of key was not the expected size for the type hash256 preimage");
+                    }
+                    // Read in the hash from key
+                    std::vector<unsigned char> hash_vec(key.begin() + 1, key.end());
+                    uint256 hash(hash_vec);
+                    if (hash256_preimages.count(hash) > 0) {
+                        throw std::ios_base::failure("Duplicate Key, input hash256 preimage already provided");
+                    }
+
+                    // Read in the preimage from value
+                    std::vector<unsigned char> preimage;
+                    s >> preimage;
+
+                    // Add to preimages list
+                    hash256_preimages.emplace(hash, std::move(preimage));
+                    break;
+                }
                 case PSBT_IN_PROPRIETARY:
                 {
                     PSBTProprietary this_prop;

src/rpc/rawtransaction.cpp

@@ -1154,7 +1154,23 @@ static RPCHelpMan decodepsbt()
                                 {
                                     {RPCResult::Type::STR_HEX, "", "hex-encoded witness data (if any)"},
                                 }},
-                                {RPCResult::Type::OBJ_DYN, "unknown", /*optional=*/true, "The unknown global fields",
+                                {RPCResult::Type::OBJ_DYN, "ripemd160_preimages", /*optional=*/ true, "",
+                                {
+                                    {RPCResult::Type::STR, "hash", "The hash and preimage that corresponds to it."},
+                                }},
+                                {RPCResult::Type::OBJ_DYN, "sha256_preimages", /*optional=*/ true, "",
+                                {
+                                    {RPCResult::Type::STR, "hash", "The hash and preimage that corresponds to it."},
+                                }},
+                                {RPCResult::Type::OBJ_DYN, "hash160_preimages", /*optional=*/ true, "",
+                                {
+                                    {RPCResult::Type::STR, "hash", "The hash and preimage that corresponds to it."},
+                                }},
+                                {RPCResult::Type::OBJ_DYN, "hash256_preimages", /*optional=*/ true, "",
+                                {
+                                    {RPCResult::Type::STR, "hash", "The hash and preimage that corresponds to it."},
+                                }},
+                                {RPCResult::Type::OBJ_DYN, "unknown", /*optional=*/ true, "The unknown input fields",
                                 {
                                     {RPCResult::Type::STR_HEX, "key", "(key-value pair) An unknown key-value pair"},
                                 }},
@@ -1373,6 +1389,42 @@ static RPCHelpMan decodepsbt()
             in.pushKV("final_scriptwitness", txinwitness);
         }
 
+        // Ripemd160 hash preimages
+        if (!input.ripemd160_preimages.empty()) {
+            UniValue ripemd160_preimages(UniValue::VOBJ);
+            for (const auto& [hash, preimage] : input.ripemd160_preimages) {
+                ripemd160_preimages.pushKV(HexStr(hash), HexStr(preimage));
+            }
+            in.pushKV("ripemd160_preimages", ripemd160_preimages);
+        }
+
+        // Sha256 hash preimages
+        if (!input.sha256_preimages.empty()) {
+            UniValue sha256_preimages(UniValue::VOBJ);
+            for (const auto& [hash, preimage] : input.sha256_preimages) {
+                sha256_preimages.pushKV(HexStr(hash), HexStr(preimage));
+            }
+            in.pushKV("sha256_preimages", sha256_preimages);
+        }
+
+        // Hash160 hash preimages
+        if (!input.hash160_preimages.empty()) {
+            UniValue hash160_preimages(UniValue::VOBJ);
+            for (const auto& [hash, preimage] : input.hash160_preimages) {
+                hash160_preimages.pushKV(HexStr(hash), HexStr(preimage));
+            }
+            in.pushKV("hash160_preimages", hash160_preimages);
+        }
+
+        // Hash256 hash preimages
+        if (!input.hash256_preimages.empty()) {
+            UniValue hash256_preimages(UniValue::VOBJ);
+            for (const auto& [hash, preimage] : input.hash256_preimages) {
+                hash256_preimages.pushKV(HexStr(hash), HexStr(preimage));
+            }
+            in.pushKV("hash256_preimages", hash256_preimages);
+        }
+
         // Proprietary
         if (!input.m_proprietary.empty()) {
             UniValue proprietary(UniValue::VARR);

test/functional/data/rpc_psbt.json

@@ -39,7 +39,11 @@
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     ],
     "creator" : [
         {