func VerifyTxScript(sigScr []byte, pkScr []byte, i int, tx *btc.Tx, ver_flags uint32) bool {
if DBG_SCR {
fmt.Println("VerifyTxScript", tx.Hash.String(), i+1, "/", len(tx.TxIn))
fmt.Println("sigScript:", hex.EncodeToString(sigScr[:]))
fmt.Println("_pkScript:", hex.EncodeToString(pkScr))
fmt.Printf("flagz:%x\n", ver_flags)
}
var st, stP2SH scrStack
if !evalScript(sigScr, &st, tx, i, ver_flags) {
if DBG_ERR {
if tx != nil {
fmt.Println("VerifyTxScript", tx.Hash.String(), i+1, "/", len(tx.TxIn))
}
fmt.Println("sigScript failed :", hex.EncodeToString(sigScr[:]))
fmt.Println("pkScript:", hex.EncodeToString(pkScr[:]))
}
return false
}
if DBG_SCR {
fmt.Println("\nsigScr verified OK")
//st.print()
fmt.Println()
}
// copy the stack content to stP2SH
if st.size() > 0 {
idx := -st.size()
for i := 0; i < st.size(); i++ {
x := st.top(idx)
stP2SH.push(x)
idx++
}
}
if !evalScript(pkScr, &st, tx, i, ver_flags) {
if DBG_SCR {
fmt.Println("* pkScript failed :", hex.EncodeToString(pkScr[:]))
fmt.Println("* VerifyTxScript", tx.Hash.String(), i+1, "/", len(tx.TxIn))
fmt.Println("* sigScript:", hex.EncodeToString(sigScr[:]))
}
return false
}
if st.size() == 0 {
if DBG_SCR {
fmt.Println("* stack empty after executing scripts:", hex.EncodeToString(pkScr[:]))
}
return false
}
if !st.popBool() {
if DBG_SCR {
fmt.Println("* FALSE on stack after executing scripts:", hex.EncodeToString(pkScr[:]))
}
return false
}
// Additional validation for spend-to-script-hash transactions:
if (ver_flags&VER_P2SH) != 0 && btc.IsPayToScript(pkScr) {
if DBG_SCR {
fmt.Println()
fmt.Println()
fmt.Println(" ******************* Looks like P2SH script ********************* ")
stP2SH.print()
}
if DBG_SCR {
fmt.Println("sigScr len", len(sigScr), hex.EncodeToString(sigScr))
}
if !IsPushOnly(sigScr) {
if DBG_ERR {
fmt.Println("P2SH is not push only")
}
return false
}
pubKey2 := stP2SH.pop()
if DBG_SCR {
fmt.Println("pubKey2:", hex.EncodeToString(pubKey2))
}
if !evalScript(pubKey2, &stP2SH, tx, i, ver_flags) {
if DBG_ERR {
fmt.Println("P2SH extra verification failed")
}
return false
}
if stP2SH.size() == 0 {
if DBG_SCR {
fmt.Println("* P2SH stack empty after executing script:", hex.EncodeToString(pubKey2))
}
return false
}
if !stP2SH.popBool() {
if DBG_SCR {
fmt.Println("* FALSE on stack after executing P2SH script:", hex.EncodeToString(pubKey2))
}
return false
}
}
return true
}
func VerifyTxScript(pkScr []byte, amount uint64, i int, tx *btc.Tx, ver_flags uint32) (result bool) {
if VerifyConsensus != nil {
defer func() {
// We call CompareToConsensus inside another function to wait for final "result"
VerifyConsensus(pkScr, amount, i, tx, ver_flags, result)
}()
}
sigScr := tx.TxIn[i].ScriptSig
if (ver_flags&VER_SIGPUSHONLY) != 0 && !btc.IsPushOnly(sigScr) {
if DBG_ERR {
fmt.Println("Not push only")
}
return false
}
if DBG_SCR {
fmt.Println("VerifyTxScript", tx.Hash.String(), i+1, "/", len(tx.TxIn))
fmt.Println("sigScript:", hex.EncodeToString(sigScr[:]))
fmt.Println("_pkScript:", hex.EncodeToString(pkScr))
fmt.Printf("flagz:%x\n", ver_flags)
}
var stack, stackCopy scrStack
if !evalScript(sigScr, amount, &stack, tx, i, ver_flags, SIGVERSION_BASE) {
if DBG_ERR {
if tx != nil {
fmt.Println("VerifyTxScript", tx.Hash.String(), i+1, "/", len(tx.TxIn))
}
fmt.Println("sigScript failed :", hex.EncodeToString(sigScr[:]))
fmt.Println("pkScript:", hex.EncodeToString(pkScr[:]))
}
return
}
if DBG_SCR {
fmt.Println("\nsigScr verified OK")
//stack.print()
fmt.Println()
}
if (ver_flags&VER_P2SH) != 0 && stack.size() > 0 {
// copy the stack content to stackCopy
stackCopy.copy_from(&stack)
}
if !evalScript(pkScr, amount, &stack, tx, i, ver_flags, SIGVERSION_BASE) {
if DBG_SCR {
fmt.Println("* pkScript failed :", hex.EncodeToString(pkScr[:]))
fmt.Println("* VerifyTxScript", tx.Hash.String(), i+1, "/", len(tx.TxIn))
fmt.Println("* sigScript:", hex.EncodeToString(sigScr[:]))
}
return
}
if stack.size() == 0 {
if DBG_SCR {
fmt.Println("* stack empty after executing scripts:", hex.EncodeToString(pkScr[:]))
}
return
}
if !stack.topBool(-1) {
if DBG_SCR {
fmt.Println("* FALSE on stack after executing scripts:", hex.EncodeToString(pkScr[:]))
}
return
}
// Bare witness programs
var witnessversion int
var witnessprogram []byte
var hadWitness bool
var witness witness_ctx
if (ver_flags & VER_WITNESS) != 0 {
if tx.SegWit != nil {
for _, wd := range tx.SegWit[i] {
witness.stack.push(wd)
}
}
witnessversion, witnessprogram = btc.IsWitnessProgram(pkScr)
if DBG_SCR {
fmt.Println("------------witnessversion:", witnessversion, " witnessprogram:", hex.EncodeToString(witnessprogram))
}
if witnessprogram != nil {
hadWitness = true
if len(sigScr) != 0 {
if DBG_ERR {
fmt.Println("SCRIPT_ERR_WITNESS_MALLEATED")
}
return
}
if !VerifyWitnessProgram(&witness, amount, tx, i, witnessversion, witnessprogram, ver_flags) {
if DBG_ERR {
fmt.Println("VerifyWitnessProgram failed A")
}
return false
}
// Bypass the cleanstack check at the end. The actual stack is obviously not clean
// for witness programs.
stack.resize(1)
} else {
if DBG_SCR {
fmt.Println("No witness program")
}
}
} else {
if DBG_SCR {
fmt.Println("Witness flag off")
}
}
// Additional validation for spend-to-script-hash transactions:
if (ver_flags&VER_P2SH) != 0 && btc.IsPayToScript(pkScr) {
if DBG_SCR {
fmt.Println()
fmt.Println()
fmt.Println(" ******************* Looks like P2SH script ********************* ")
stack.print()
}
if DBG_SCR {
fmt.Println("sigScr len", len(sigScr), hex.EncodeToString(sigScr))
}
if !btc.IsPushOnly(sigScr) {
if DBG_ERR {
fmt.Println("P2SH is not push only")
}
return
}
// Restore stack.
stack = stackCopy
pubKey2 := stack.pop()
if DBG_SCR {
fmt.Println("pubKey2:", hex.EncodeToString(pubKey2))
}
if !evalScript(pubKey2, amount, &stack, tx, i, ver_flags, SIGVERSION_BASE) {
if DBG_ERR {
fmt.Println("P2SH extra verification failed")
}
return
}
if stack.size() == 0 {
if DBG_SCR {
fmt.Println("* P2SH stack empty after executing script:", hex.EncodeToString(pubKey2))
}
return
}
if !stack.topBool(-1) {
if DBG_SCR {
fmt.Println("* FALSE on stack after executing P2SH script:", hex.EncodeToString(pubKey2))
}
return
}
if (ver_flags & VER_WITNESS) != 0 {
witnessversion, witnessprogram = btc.IsWitnessProgram(pubKey2)
if DBG_SCR {
fmt.Println("============witnessversion:", witnessversion, " witnessprogram:", hex.EncodeToString(witnessprogram))
}
if witnessprogram != nil {
hadWitness = true
bt := new(bytes.Buffer)
btc.WritePutLen(bt, uint32(len(pubKey2)))
bt.Write(pubKey2)
if !bytes.Equal(sigScr, bt.Bytes()) {
if DBG_ERR {
fmt.Println(hex.EncodeToString(sigScr))
fmt.Println(hex.EncodeToString(bt.Bytes()))
fmt.Println("SCRIPT_ERR_WITNESS_MALLEATED_P2SH")
}
return
}
if !VerifyWitnessProgram(&witness, amount, tx, i, witnessversion, witnessprogram, ver_flags) {
if DBG_ERR {
fmt.Println("VerifyWitnessProgram failed B")
}
return false
}
// Bypass the cleanstack check at the end. The actual stack is obviously not clean
// for witness programs.
stack.resize(1)
}
}
}
if (ver_flags & VER_CLEANSTACK) != 0 {
if (ver_flags & VER_P2SH) == 0 {
panic("VER_CLEANSTACK without VER_P2SH")
}
if DBG_SCR {
fmt.Println("stack size", stack.size())
}
if stack.size() != 1 {
if DBG_ERR {
fmt.Println("Stack not clean")
}
return
}
}
if (ver_flags & VER_WITNESS) != 0 {
// We can't check for correct unexpected witness data if P2SH was off, so require
// that WITNESS implies P2SH. Otherwise, going from WITNESS->P2SH+WITNESS would be
// possible, which is not a softfork.
if (ver_flags & VER_P2SH) == 0 {
panic("VER_WITNESS must be used with P2SH")
}
if !hadWitness && !witness.IsNull() {
if DBG_ERR {
fmt.Println("SCRIPT_ERR_WITNESS_UNEXPECTED", len(tx.SegWit))
}
return
}
}
result = true
return true
}