1 files changed, 157 insertions, 0 deletions
diff --git a/ethchain/transaction.go b/ethchain/transaction.go
new file mode 100644
index 000000000..1a9258201
--- /dev/null
+++ b/ethchain/transaction.go
@@ -0,0 +1,157 @@
+package ethchain
+
+import (
+	"github.com/ethereum/eth-go/ethutil"
+	"github.com/obscuren/secp256k1-go"
+	"math/big"
+)
+
+type Transaction struct {
+	Nonce     uint64
+	Recipient []byte
+	Value     *big.Int
+	Data      []string
+	Memory    []int
+	v         byte
+	r, s      []byte
+}
+
+func NewTransaction(to []byte, value *big.Int, data []string) *Transaction {
+	tx := Transaction{Recipient: to, Value: value}
+	tx.Nonce = 0
+
+	// Serialize the data
+	tx.Data = make([]string, len(data))
+	for i, val := range data {
+		instr, err := ethutil.CompileInstr(val)
+		if err != nil {
+			//fmt.Printf("compile error:%d %v\n", i+1, err)
+		}
+
+		tx.Data[i] = instr
+	}
+
+	return &tx
+}
+
+func NewTransactionFromData(data []byte) *Transaction {
+	tx := &Transaction{}
+	tx.RlpDecode(data)
+
+	return tx
+}
+
+func NewTransactionFromValue(val *ethutil.Value) *Transaction {
+	tx := &Transaction{}
+	tx.RlpValueDecode(val)
+
+	return tx
+}
+
+func (tx *Transaction) Hash() []byte {
+	data := make([]interface{}, len(tx.Data))
+	for i, val := range tx.Data {
+		data[i] = val
+	}
+
+	preEnc := []interface{}{
+		tx.Nonce,
+		tx.Recipient,
+		tx.Value,
+		data,
+	}
+
+	return ethutil.Sha3Bin(ethutil.Encode(preEnc))
+}
+
+func (tx *Transaction) IsContract() bool {
+	return len(tx.Recipient) == 0
+}
+
+func (tx *Transaction) Signature(key []byte) []byte {
+	hash := tx.Hash()
+
+	sig, _ := secp256k1.Sign(hash, key)
+
+	return sig
+}
+
+func (tx *Transaction) PublicKey() []byte {
+	hash := tx.Hash()
+
+	// If we don't make a copy we will overwrite the existing underlying array
+	dst := make([]byte, len(tx.r))
+	copy(dst, tx.r)
+
+	sig := append(dst, tx.s...)
+	sig = append(sig, tx.v-27)
+
+	pubkey, _ := secp256k1.RecoverPubkey(hash, sig)
+
+	return pubkey
+}
+
+func (tx *Transaction) Sender() []byte {
+	pubkey := tx.PublicKey()
+
+	// Validate the returned key.
+	// Return nil if public key isn't in full format
+	if pubkey[0] != 4 {
+		return nil
+	}
+
+	return ethutil.Sha3Bin(pubkey[1:])[12:]
+}
+
+func (tx *Transaction) Sign(privk []byte) error {
+
+	sig := tx.Signature(privk)
+
+	tx.r = sig[:32]
+	tx.s = sig[32:64]
+	tx.v = sig[64] + 27
+
+	return nil
+}
+
+func (tx *Transaction) RlpData() interface{} {
+	// Prepare the transaction for serialization
+	return []interface{}{
+		tx.Nonce,
+		tx.Recipient,
+		tx.Value,
+		ethutil.NewSliceValue(tx.Data).Slice(),
+		tx.v,
+		tx.r,
+		tx.s,
+	}
+}
+
+func (tx *Transaction) RlpValue() *ethutil.Value {
+	return ethutil.NewValue(tx.RlpData())
+}
+
+func (tx *Transaction) RlpEncode() []byte {
+	return tx.RlpValue().Encode()
+}
+
+func (tx *Transaction) RlpDecode(data []byte) {
+	tx.RlpValueDecode(ethutil.NewValueFromBytes(data))
+}
+
+func (tx *Transaction) RlpValueDecode(decoder *ethutil.Value) {
+	tx.Nonce = decoder.Get(0).Uint()
+	tx.Recipient = decoder.Get(1).Bytes()
+	tx.Value = decoder.Get(2).BigInt()
+
+	d := decoder.Get(3)
+	tx.Data = make([]string, d.Len())
+	for i := 0; i < d.Len(); i++ {
+		tx.Data[i] = d.Get(i).Str()
+	}
+
+	// TODO something going wrong here
+	tx.v = byte(decoder.Get(4).Uint())
+	tx.r = decoder.Get(5).Bytes()
+	tx.s = decoder.Get(6).Bytes()
+}