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-rw-r--r--src/policy/policy.h1
-rw-r--r--src/script/interpreter.cpp14
-rw-r--r--src/script/interpreter.h4
-rw-r--r--src/script/script_error.cpp2
-rw-r--r--src/script/script_error.h1
-rw-r--r--src/test/data/script_tests.json33
-rw-r--r--src/test/script_tests.cpp1
-rw-r--r--src/test/transaction_tests.cpp1
8 files changed, 55 insertions, 2 deletions
diff --git a/src/policy/policy.h b/src/policy/policy.h
index 458ec4a0cb..9d6ff1233b 100644
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -43,6 +43,7 @@ static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
SCRIPT_VERIFY_CLEANSTACK |
SCRIPT_VERIFY_MINIMALIF |
+ SCRIPT_VERIFY_NULLFAIL |
SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
SCRIPT_VERIFY_LOW_S |
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index fd356fed0a..41756ea711 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -885,6 +885,9 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, un
}
bool fSuccess = checker.CheckSig(vchSig, vchPubKey, scriptCode, sigversion);
+ if (!fSuccess && (flags & SCRIPT_VERIFY_NULLFAIL) && vchSig.size())
+ return set_error(serror, SCRIPT_ERR_SIG_NULLFAIL);
+
popstack(stack);
popstack(stack);
stack.push_back(fSuccess ? vchTrue : vchFalse);
@@ -914,6 +917,9 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, un
if (nOpCount > MAX_OPS_PER_SCRIPT)
return set_error(serror, SCRIPT_ERR_OP_COUNT);
int ikey = ++i;
+ // ikey2 is the position of last non-signature item in the stack. Top stack item = 1.
+ // With SCRIPT_VERIFY_NULLFAIL, this is used for cleanup if operation fails.
+ int ikey2 = nKeysCount + 2;
i += nKeysCount;
if ((int)stack.size() < i)
return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
@@ -970,8 +976,14 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, un
}
// Clean up stack of actual arguments
- while (i-- > 1)
+ while (i-- > 1) {
+ // If the operation failed, we require that all signatures must be empty vector
+ if (!fSuccess && (flags & SCRIPT_VERIFY_NULLFAIL) && !ikey2 && stacktop(-1).size())
+ return set_error(serror, SCRIPT_ERR_SIG_NULLFAIL);
+ if (ikey2 > 0)
+ ikey2--;
popstack(stack);
+ }
// A bug causes CHECKMULTISIG to consume one extra argument
// whose contents were not checked in any way.
diff --git a/src/script/interpreter.h b/src/script/interpreter.h
index 2ce4b23e54..0adc9482ff 100644
--- a/src/script/interpreter.h
+++ b/src/script/interpreter.h
@@ -98,6 +98,10 @@ enum
// Segwit script only: Require the argument of OP_IF/NOTIF to be exactly 0x01 or empty vector
//
SCRIPT_VERIFY_MINIMALIF = (1U << 13),
+
+ // Signature(s) must be empty vector if an CHECK(MULTI)SIG operation failed
+ //
+ SCRIPT_VERIFY_NULLFAIL = (1U << 14),
};
bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);
diff --git a/src/script/script_error.cpp b/src/script/script_error.cpp
index 9969c232fc..e27b715c2c 100644
--- a/src/script/script_error.cpp
+++ b/src/script/script_error.cpp
@@ -65,6 +65,8 @@ const char* ScriptErrorString(const ScriptError serror)
return "Dummy CHECKMULTISIG argument must be zero";
case SCRIPT_ERR_MINIMALIF:
return "OP_IF/NOTIF argument must be minimal";
+ case SCRIPT_ERR_SIG_NULLFAIL:
+ return "Signature must be zero for failed CHECK(MULTI)SIG operation";
case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS:
return "NOPx reserved for soft-fork upgrades";
case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM:
diff --git a/src/script/script_error.h b/src/script/script_error.h
index 6d34d37925..bccfdb99e2 100644
--- a/src/script/script_error.h
+++ b/src/script/script_error.h
@@ -49,6 +49,7 @@ typedef enum ScriptError_t
SCRIPT_ERR_PUBKEYTYPE,
SCRIPT_ERR_CLEANSTACK,
SCRIPT_ERR_MINIMALIF,
+ SCRIPT_ERR_SIG_NULLFAIL,
/* softfork safeness */
SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS,
diff --git a/src/test/data/script_tests.json b/src/test/data/script_tests.json
index d456a8beff..06103ea5bd 100644
--- a/src/test/data/script_tests.json
+++ b/src/test/data/script_tests.json
@@ -1492,6 +1492,27 @@
"BIP66 example 4, with DERSIG"
],
[
+ "0x09 0x300602010102010101",
+ "0x21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 CHECKSIG NOT",
+ "DERSIG",
+ "OK",
+ "BIP66 example 4, with DERSIG, non-null DER-compliant signature"
+],
+[
+ "0",
+ "0x21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 CHECKSIG NOT",
+ "DERSIG,NULLFAIL",
+ "OK",
+ "BIP66 example 4, with DERSIG and NULLFAIL"
+],
+[
+ "0x09 0x300602010102010101",
+ "0x21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 CHECKSIG NOT",
+ "DERSIG,NULLFAIL",
+ "NULLFAIL",
+ "BIP66 example 4, with DERSIG and NULLFAIL, non-null DER-compliant signature"
+],
+[
"1",
"0x21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 CHECKSIG",
"",
@@ -2208,5 +2229,15 @@
[["645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS", "UNBALANCED_CONDITIONAL"],
[["645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS,MINIMALIF", "UNBALANCED_CONDITIONAL"],
- ["The End"]
+["NULLFAIL should cover all signatures and signatures only"],
+["0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0", "0x01 0x14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0x01 0x14 CHECKMULTISIG NOT", "DERSIG", "OK", "BIP66 and NULLFAIL-compliant"],
+["0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0", "0x01 0x14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0x01 0x14 CHECKMULTISIG NOT", "DERSIG,NULLFAIL", "OK", "BIP66 and NULLFAIL-compliant"],
+["1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0", "0x01 0x14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0x01 0x14 CHECKMULTISIG NOT", "DERSIG,NULLFAIL", "OK", "BIP66 and NULLFAIL-compliant, not NULLDUMMY-compliant"],
+["1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0", "0x01 0x14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0x01 0x14 CHECKMULTISIG NOT", "DERSIG,NULLFAIL,NULLDUMMY", "SIG_NULLDUMMY", "BIP66 and NULLFAIL-compliant, not NULLDUMMY-compliant"],
+["0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0x09 0x300602010102010101", "0x01 0x14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0x01 0x14 CHECKMULTISIG NOT", "DERSIG", "OK", "BIP66-compliant but not NULLFAIL-compliant"],
+["0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0x09 0x300602010102010101", "0x01 0x14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0x01 0x14 CHECKMULTISIG NOT", "DERSIG,NULLFAIL", "NULLFAIL", "BIP66-compliant but not NULLFAIL-compliant"],
+["0 0x09 0x300602010102010101 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0", "0x01 0x14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0x01 0x14 CHECKMULTISIG NOT", "DERSIG", "OK", "BIP66-compliant but not NULLFAIL-compliant"],
+["0 0x09 0x300602010102010101 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0", "0x01 0x14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0x01 0x14 CHECKMULTISIG NOT", "DERSIG,NULLFAIL", "NULLFAIL", "BIP66-compliant but not NULLFAIL-compliant"],
+
+["The End"]
]
diff --git a/src/test/script_tests.cpp b/src/test/script_tests.cpp
index ee0f14ee5e..7971b5122f 100644
--- a/src/test/script_tests.cpp
+++ b/src/test/script_tests.cpp
@@ -90,6 +90,7 @@ static ScriptErrorDesc script_errors[]={
{SCRIPT_ERR_PUBKEYTYPE, "PUBKEYTYPE"},
{SCRIPT_ERR_CLEANSTACK, "CLEANSTACK"},
{SCRIPT_ERR_MINIMALIF, "MINIMALIF"},
+ {SCRIPT_ERR_SIG_NULLFAIL, "NULLFAIL"},
{SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS, "DISCOURAGE_UPGRADABLE_NOPS"},
{SCRIPT_ERR_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM, "DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM"},
{SCRIPT_ERR_WITNESS_PROGRAM_WRONG_LENGTH, "WITNESS_PROGRAM_WRONG_LENGTH"},
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
index 165dfd9a3e..6163d2f630 100644
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -51,6 +51,7 @@ static std::map<string, unsigned int> mapFlagNames = boost::assign::map_list_of
(string("DISCOURAGE_UPGRADABLE_NOPS"), (unsigned int)SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS)
(string("CLEANSTACK"), (unsigned int)SCRIPT_VERIFY_CLEANSTACK)
(string("MINIMALIF"), (unsigned int)SCRIPT_VERIFY_MINIMALIF)
+ (string("NULLFAIL"), (unsigned int)SCRIPT_VERIFY_NULLFAIL)
(string("CHECKLOCKTIMEVERIFY"), (unsigned int)SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY)
(string("CHECKSEQUENCEVERIFY"), (unsigned int)SCRIPT_VERIFY_CHECKSEQUENCEVERIFY)
(string("WITNESS"), (unsigned int)SCRIPT_VERIFY_WITNESS)
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-20 10:30:20 +0000