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script/sign: signing support for Miniscripts with hash preimage challenges

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Preimages must be externally provided (typically, via a PSBT).
This commit is contained in:
Antoine Poinsot
2021-12-04 14:39:24 +01:00
parent a2f81b6a8f
commit 560e62b1e2
9 changed files with 109 additions and 37 deletions
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15
src/test/script_tests.cpp
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@@ -1191,7 +1191,8 @@ BOOST_AUTO_TEST_CASE(script_combineSigs)
BOOST_CHECK(combined.scriptSig.empty());
// Single signature case:
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL)); // changes scriptSig
SignatureData dummy;
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL, dummy)); // changes scriptSig
scriptSig = DataFromTransaction(txTo, 0, txFrom.vout[0]);
combined = CombineSignatures(txFrom.vout[0], txTo, scriptSig, empty);
BOOST_CHECK(combined.scriptSig == scriptSig.scriptSig);
@@ -1199,7 +1200,8 @@ BOOST_AUTO_TEST_CASE(script_combineSigs)
BOOST_CHECK(combined.scriptSig == scriptSig.scriptSig);
SignatureData scriptSigCopy = scriptSig;
// Signing again will give a different, valid signature:
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL));
SignatureData dummy_b;
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL, dummy_b));
scriptSig = DataFromTransaction(txTo, 0, txFrom.vout[0]);
combined = CombineSignatures(txFrom.vout[0], txTo, scriptSigCopy, scriptSig);
BOOST_CHECK(combined.scriptSig == scriptSigCopy.scriptSig || combined.scriptSig == scriptSig.scriptSig);
@@ -1208,14 +1210,16 @@ BOOST_AUTO_TEST_CASE(script_combineSigs)
CScript pkSingle; pkSingle << ToByteVector(keys[0].GetPubKey()) << OP_CHECKSIG;
BOOST_CHECK(keystore.AddCScript(pkSingle));
scriptPubKey = GetScriptForDestination(ScriptHash(pkSingle));
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL));
SignatureData dummy_c;
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL, dummy_c));
scriptSig = DataFromTransaction(txTo, 0, txFrom.vout[0]);
combined = CombineSignatures(txFrom.vout[0], txTo, scriptSig, empty);
BOOST_CHECK(combined.scriptSig == scriptSig.scriptSig);
combined = CombineSignatures(txFrom.vout[0], txTo, empty, scriptSig);
BOOST_CHECK(combined.scriptSig == scriptSig.scriptSig);
scriptSigCopy = scriptSig;
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL));
SignatureData dummy_d;
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL, dummy_d));
scriptSig = DataFromTransaction(txTo, 0, txFrom.vout[0]);
combined = CombineSignatures(txFrom.vout[0], txTo, scriptSigCopy, scriptSig);
BOOST_CHECK(combined.scriptSig == scriptSigCopy.scriptSig || combined.scriptSig == scriptSig.scriptSig);
@@ -1223,7 +1227,8 @@ BOOST_AUTO_TEST_CASE(script_combineSigs)
// Hardest case: Multisig 2-of-3
scriptPubKey = GetScriptForMultisig(2, pubkeys);
BOOST_CHECK(keystore.AddCScript(scriptPubKey));
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL));
SignatureData dummy_e;
BOOST_CHECK(SignSignature(keystore, CTransaction(txFrom), txTo, 0, SIGHASH_ALL, dummy_e));
scriptSig = DataFromTransaction(txTo, 0, txFrom.vout[0]);
combined = CombineSignatures(txFrom.vout[0], txTo, scriptSig, empty);
BOOST_CHECK(combined.scriptSig == scriptSig.scriptSig);