psbt: Allow both non_witness_utxo and witness_utxo

src/psbt.cpp

@@ -35,14 +35,6 @@ bool PartiallySignedTransaction::Merge(const PartiallySignedTransaction& psbt)
     return true;
 }
 
-bool PartiallySignedTransaction::IsSane() const
-{
-    for (PSBTInput input : inputs) {
-        if (!input.IsSane()) return false;
-    }
-    return true;
-}
-
 bool PartiallySignedTransaction::AddInput(const CTxIn& txin, PSBTInput& psbtin)
 {
     if (std::find(tx->vin.begin(), tx->vin.end(), txin) != tx->vin.end()) {
@@ -158,18 +150,6 @@ void PSBTInput::Merge(const PSBTInput& input)
     if (final_script_witness.IsNull() && !input.final_script_witness.IsNull()) final_script_witness = input.final_script_witness;
 }
 
-bool PSBTInput::IsSane() const
-{
-    // Cannot have both witness and non-witness utxos
-    if (!witness_utxo.IsNull() && non_witness_utxo) return false;
-
-    // If we have a witness_script or a scriptWitness, we must also have a witness utxo
-    if (!witness_script.empty() && witness_utxo.IsNull()) return false;
-    if (!final_script_witness.IsNull() && witness_utxo.IsNull()) return false;
-
-    return true;
-}
-
 void PSBTOutput::FillSignatureData(SignatureData& sigdata) const
 {
     if (!redeem_script.empty()) {
@@ -261,11 +241,6 @@ bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction&
     bool require_witness_sig = false;
     CTxOut utxo;
 
-    // Verify input sanity, which checks that at most one of witness or non-witness utxos is provided.
-    if (!input.IsSane()) {
-        return false;
-    }
-
     if (input.non_witness_utxo) {
         // If we're taking our information from a non-witness UTXO, verify that it matches the prevout.
         COutPoint prevout = tx.vin[index].prevout;
@@ -356,10 +331,6 @@ TransactionError CombinePSBTs(PartiallySignedTransaction& out, const std::vector
             return TransactionError::PSBT_MISMATCH;
         }
     }
-    if (!out.IsSane()) {
-        return TransactionError::INVALID_PSBT;
-    }
-
     return TransactionError::OK;
 }
 

src/psbt.h

@@ -62,7 +62,6 @@ struct PSBTInput
     void FillSignatureData(SignatureData& sigdata) const;
     void FromSignatureData(const SignatureData& sigdata);
     void Merge(const PSBTInput& input);
-    bool IsSane() const;
     PSBTInput() {}
 
     template <typename Stream>
@@ -284,7 +283,6 @@ struct PSBTOutput
     void FillSignatureData(SignatureData& sigdata) const;
     void FromSignatureData(const SignatureData& sigdata);
     void Merge(const PSBTOutput& output);
-    bool IsSane() const;
     PSBTOutput() {}
 
     template <typename Stream>
@@ -401,7 +399,6 @@ struct PartiallySignedTransaction
     /** Merge psbt into this. The two psbts must have the same underlying CTransaction (i.e. the
       * same actual Bitcoin transaction.) Returns true if the merge succeeded, false otherwise. */
     NODISCARD bool Merge(const PartiallySignedTransaction& psbt);
-    bool IsSane() const;
     bool AddInput(const CTxIn& txin, PSBTInput& psbtin);
     bool AddOutput(const CTxOut& txout, const PSBTOutput& psbtout);
     PartiallySignedTransaction() {}
@@ -551,10 +548,6 @@ struct PartiallySignedTransaction
         if (outputs.size() != tx->vout.size()) {
             throw std::ios_base::failure("Outputs provided does not match the number of outputs in transaction.");
         }
-        // Sanity check
-        if (!IsSane()) {
-            throw std::ios_base::failure("PSBT is not sane.");
-        }
     }
 
     template <typename Stream>

src/test/fuzz/psbt.cpp

@@ -39,7 +39,6 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     }
 
     (void)psbt.IsNull();
-    (void)psbt.IsSane();
 
     Optional<CMutableTransaction> tx = psbt.tx;
     if (tx) {
@@ -50,7 +49,6 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     for (const PSBTInput& input : psbt.inputs) {
         (void)PSBTInputSigned(input);
         (void)input.IsNull();
-        (void)input.IsSane();
     }
 
     for (const PSBTOutput& output : psbt.outputs) {

src/wallet/scriptpubkeyman.cpp

@@ -597,11 +597,6 @@ TransactionError LegacyScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psb
             continue;
         }
 
-        // Verify input looks sane. This will check that we have at most one uxto, witness or non-witness.
-        if (!input.IsSane()) {
-            return TransactionError::INVALID_PSBT;
-        }
-
         // Get the Sighash type
         if (sign && input.sighash_type > 0 && input.sighash_type != sighash_type) {
             return TransactionError::SIGHASH_MISMATCH;
@@ -2086,11 +2081,6 @@ TransactionError DescriptorScriptPubKeyMan::FillPSBT(PartiallySignedTransaction&
             continue;
         }
 
-        // Verify input looks sane. This will check that we have at most one uxto, witness or non-witness.
-        if (!input.IsSane()) {
-            return TransactionError::INVALID_PSBT;
-        }
-
         // Get the Sighash type
         if (sign && input.sighash_type > 0 && input.sighash_type != sighash_type) {
             return TransactionError::SIGHASH_MISMATCH;

src/wallet/wallet.cpp

@@ -2491,11 +2491,6 @@ TransactionError CWallet::FillPSBT(PartiallySignedTransaction& psbtx, bool& comp
             continue;
         }
 
-        // Verify input looks sane. This will check that we have at most one uxto, witness or non-witness.
-        if (!input.IsSane()) {
-            return TransactionError::INVALID_PSBT;
-        }
-
         // If we have no utxo, grab it from the wallet.
         if (!input.non_witness_utxo && input.witness_utxo.IsNull()) {
             const uint256& txhash = txin.prevout.hash;