1 files changed, 42 insertions, 0 deletions
diff --git a/src/test/util/transaction_utils.cpp b/src/test/util/transaction_utils.cpp
index 300caa577c..a588e61944 100644
--- a/src/test/util/transaction_utils.cpp
+++ b/src/test/util/transaction_utils.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <coins.h>
+#include <consensus/validation.h>
 #include <script/signingprovider.h>
 #include <test/util/transaction_utils.h>
 
@@ -69,3 +70,44 @@ std::vector<CMutableTransaction> SetupDummyInputs(FillableSigningProvider& keyst
 
     return dummyTransactions;
 }
+
+void BulkTransaction(CMutableTransaction& tx, int32_t target_weight)
+{
+    tx.vout.emplace_back(0, CScript() << OP_RETURN);
+    auto unpadded_weight{GetTransactionWeight(CTransaction(tx))};
+    assert(target_weight >= unpadded_weight);
+
+    // determine number of needed padding bytes by converting weight difference to vbytes
+    auto dummy_vbytes = (target_weight - unpadded_weight + (WITNESS_SCALE_FACTOR - 1)) / WITNESS_SCALE_FACTOR;
+    // compensate for the increase of the compact-size encoded script length
+    // (note that the length encoding of the unpadded output script needs one byte)
+    dummy_vbytes -= GetSizeOfCompactSize(dummy_vbytes) - 1;
+
+    // pad transaction by repeatedly appending a dummy opcode to the output script
+    tx.vout[0].scriptPubKey.insert(tx.vout[0].scriptPubKey.end(), dummy_vbytes, OP_1);
+
+    // actual weight should be at most 3 higher than target weight
+    assert(GetTransactionWeight(CTransaction(tx)) >= target_weight);
+    assert(GetTransactionWeight(CTransaction(tx)) <= target_weight + 3);
+}
+
+bool SignSignature(const SigningProvider &provider, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, const CAmount& amount, int nHashType, SignatureData& sig_data)
+{
+    assert(nIn < txTo.vin.size());
+
+    MutableTransactionSignatureCreator creator(txTo, nIn, amount, nHashType);
+
+    bool ret = ProduceSignature(provider, creator, fromPubKey, sig_data);
+    UpdateInput(txTo.vin.at(nIn), sig_data);
+    return ret;
+}
+
+bool SignSignature(const SigningProvider &provider, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType, SignatureData& sig_data)
+{
+    assert(nIn < txTo.vin.size());
+    const CTxIn& txin = txTo.vin[nIn];
+    assert(txin.prevout.n < txFrom.vout.size());
+    const CTxOut& txout = txFrom.vout[txin.prevout.n];
+
+    return SignSignature(provider, txout.scriptPubKey, txTo, nIn, txout.nValue, nHashType, sig_data);
+}