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-rw-r--r--src/script/interpreter.cpp5
-rw-r--r--src/test/data/script_invalid.json2
-rw-r--r--src/test/data/script_valid.json5
-rw-r--r--src/test/multisig_tests.cpp4
4 files changed, 11 insertions, 5 deletions
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index d0f75ab672..8a06f3d118 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -189,6 +189,11 @@ bool static IsDefinedHashtypeSignature(const valtype &vchSig) {
}
bool static CheckSignatureEncoding(const valtype &vchSig, unsigned int flags, ScriptError* serror) {
+ // Empty signature. Not strictly DER encoded, but allowed to provide a
+ // compact way to provide an invalid signature for use with CHECK(MULTI)SIG
+ if (vchSig.size() == 0) {
+ return true;
+ }
if ((flags & (SCRIPT_VERIFY_DERSIG | SCRIPT_VERIFY_LOW_S | SCRIPT_VERIFY_STRICTENC)) != 0 && !IsDERSignature(vchSig)) {
return set_error(serror, SCRIPT_ERR_SIG_DER);
} else if ((flags & SCRIPT_VERIFY_LOW_S) != 0 && !IsLowDERSignature(vchSig, serror)) {
diff --git a/src/test/data/script_invalid.json b/src/test/data/script_invalid.json
index 42b79e7470..9a8fe1ee88 100644
--- a/src/test/data/script_invalid.json
+++ b/src/test/data/script_invalid.json
@@ -504,7 +504,7 @@
"2-of-2 CHECKMULTISIG NOT with the first pubkey invalid, and both signatures validly encoded."
],
[
- "0 0x47 0x3044022044dc17b0887c161bb67ba9635bf758735bdde503e4b0a0987f587f14a4e1143d022009a215772d49a85dae40d8ca03955af26ad3978a0ff965faa12915e9586249a501 0",
+ "0 0x47 0x3044022044dc17b0887c161bb67ba9635bf758735bdde503e4b0a0987f587f14a4e1143d022009a215772d49a85dae40d8ca03955af26ad3978a0ff965faa12915e9586249a501 1",
"2 0x21 0x02865c40293a680cb9c020e7b1e106d8c1916d3cef99aa431a56d253e69256dac0 0x21 0x02865c40293a680cb9c020e7b1e106d8c1916d3cef99aa431a56d253e69256dac0 2 CHECKMULTISIG NOT",
"STRICTENC",
"2-of-2 CHECKMULTISIG NOT with both pubkeys valid, but first signature invalid."
diff --git a/src/test/data/script_valid.json b/src/test/data/script_valid.json
index 5253d5e39e..a187401cd4 100644
--- a/src/test/data/script_valid.json
+++ b/src/test/data/script_valid.json
@@ -662,6 +662,11 @@
["0 0 0x02 0x0000", "CHECKMULTISIGVERIFY 1", ""],
["0 0x02 0x0000 0", "CHECKMULTISIGVERIFY 1", ""],
+["While not really correctly DER encoded, the empty signature is allowed by"],
+["STRICTENC to provide a compact way to provide a delibrately invalid signature."],
+["0", "0x21 0x02865c40293a680cb9c020e7b1e106d8c1916d3cef99aa431a56d253e69256dac0 CHECKSIG NOT", "STRICTENC"],
+["0 0", "1 0x21 0x02865c40293a680cb9c020e7b1e106d8c1916d3cef99aa431a56d253e69256dac0 1 CHECKMULTISIG NOT", "STRICTENC"],
+
["CHECKMULTISIG evaluation order tests. CHECKMULTISIG evaluates signatures and"],
["pubkeys in a specific order, and will exit early if the number of signatures"],
["left to check is greater than the number of keys left. As STRICTENC fails the"],
diff --git a/src/test/multisig_tests.cpp b/src/test/multisig_tests.cpp
index 69d8522188..9501169943 100644
--- a/src/test/multisig_tests.cpp
+++ b/src/test/multisig_tests.cpp
@@ -116,10 +116,6 @@ BOOST_AUTO_TEST_CASE(multisig_verify)
}
}
s.clear();
- s << OP_0 << OP_0;
- BOOST_CHECK(!VerifyScript(s, a_or_b, flags, SignatureChecker(txTo[1], 0), &err));
- BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_SIG_DER, ScriptErrorString(err));
- s.clear();
s << OP_0 << OP_1;
BOOST_CHECK(!VerifyScript(s, a_or_b, flags, SignatureChecker(txTo[1], 0), &err));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_SIG_DER, ScriptErrorString(err));