Example #1
0
// checkPkScriptStandard performs a series of checks on a transaction output
// script (public key script) to ensure it is a "standard" public key script.
// A standard public key script is one that is a recognized form, and for
// multi-signature scripts, only contains from 1 to maxStandardMultiSigKeys
// public keys.
func checkPkScriptStandard(pkScript []byte, scriptClass txscript.ScriptClass) error {
	switch scriptClass {
	case txscript.MultiSigTy:
		numPubKeys, numSigs, err := txscript.CalcMultiSigStats(pkScript)
		if err != nil {
			str := fmt.Sprintf("multi-signature script parse "+
				"failure: %v", err)
			return txRuleError(wire.RejectNonstandard, str)
		}

		// A standard multi-signature public key script must contain
		// from 1 to maxStandardMultiSigKeys public keys.
		if numPubKeys < 1 {
			str := "multi-signature script with no pubkeys"
			return txRuleError(wire.RejectNonstandard, str)
		}
		if numPubKeys > maxStandardMultiSigKeys {
			str := fmt.Sprintf("multi-signature script with %d "+
				"public keys which is more than the allowed "+
				"max of %d", numPubKeys, maxStandardMultiSigKeys)
			return txRuleError(wire.RejectNonstandard, str)
		}

		// A standard multi-signature public key script must have at
		// least 1 signature and no more signatures than available
		// public keys.
		if numSigs < 1 {
			return txRuleError(wire.RejectNonstandard,
				"multi-signature script with no signatures")
		}
		if numSigs > numPubKeys {
			str := fmt.Sprintf("multi-signature script with %d "+
				"signatures which is more than the available "+
				"%d public keys", numSigs, numPubKeys)
			return txRuleError(wire.RejectNonstandard, str)
		}

	case txscript.NonStandardTy:
		return txRuleError(wire.RejectNonstandard,
			"non-standard script form")
	}

	return nil
}
Example #2
0
// TestCalcMultiSigStats ensures the CalcMutliSigStats function returns the
// expected errors.
func TestCalcMultiSigStats(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name   string
		script string
		err    error
	}{
		{
			name: "short script",
			script: "0x046708afdb0fe5548271967f1a67130b7105cd6a828" +
				"e03909a67962e0ea1f61d",
			err: txscript.ErrStackShortScript,
		},
		{
			name: "stack underflow",
			script: "RETURN DATA_41 0x046708afdb0fe5548271967f1a" +
				"67130b7105cd6a828e03909a67962e0ea1f61deb649f6" +
				"bc3f4cef308",
			err: txscript.ErrStackUnderflow,
		},
		{
			name: "multisig script",
			script: "0 DATA_72 0x30450220106a3e4ef0b51b764a2887226" +
				"2ffef55846514dacbdcbbdd652c849d395b4384022100" +
				"e03ae554c3cbb40600d31dd46fc33f25e47bf8525b1fe" +
				"07282e3b6ecb5f3bb2801 CODESEPARATOR 1 DATA_33 " +
				"0x0232abdc893e7f0631364d7fd01cb33d24da45329a0" +
				"0357b3a7886211ab414d55a 1 CHECKMULTISIG",
			err: nil,
		},
	}

	for i, test := range tests {
		script := mustParseShortForm(test.script)
		if _, _, err := txscript.CalcMultiSigStats(script); err != test.err {
			t.Errorf("CalcMultiSigStats #%d (%s) unexpected "+
				"error\ngot: %v\nwant: %v", i, test.name, err,
				test.err)
		}
	}
}