Initial commit

chain/transaction.go

@@ -0,0 +1,43 @@
+package chain
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"encoding/gob"
+	"time"
+)
+
+type transaction struct {
+	Src       string
+	Dst       string
+	Amount    int
+	Timestamp time.Time
+}
+
+func NewTransaction(source string, dst string, amount int) transaction {
+	return transaction{Src: source, Dst: dst, Amount: amount, Timestamp: time.Now()}
+}
+
+func (ta transaction) SignTransaction(privKey *rsa.PrivateKey, d int) ([]byte, error) {
+
+	return rsa.SignPKCS1v15(rand.Reader, privKey, crypto.SHA256, ta.HashTransaction())
+}
+
+func (ta transaction) HashTransaction() []byte {
+	var buf bytes.Buffer
+	gob.NewEncoder(&buf).Encode(ta)
+	hash := sha256.New().Sum(buf.Bytes())
+	return hash
+}
+
+func (ta transaction) ToBytes() []byte {
+	bytes := []byte(ta.Src)
+	bytes = append(bytes, []byte(ta.Dst)...)
+	//fmt.Printf("%s", ta.Dst)
+	bytes = append(bytes, byte(ta.Amount))
+	bytes = append(bytes, []byte(ta.Timestamp.String())...)
+	return bytes
+}