53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
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package common
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import (
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"bytes"
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ed "crypto/ed25519"
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"crypto/sha512"
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"encoding/binary"
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"time"
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)
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func Float64ToBytes(f float64) []byte {
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buf := make([]byte, 8)
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binary.BigEndian.PutUint64(buf, uint64(f))
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return buf
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}
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func GetTransactionHash(receiverPubKey []byte, message string, amount float64, createdAt time.Time) []byte {
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amountBytes := Float64ToBytes(amount)
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hash := sha512.New()
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timestamp := createdAt.Unix()
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_ = binary.Write(hash, binary.BigEndian, timestamp)
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hash.Write([]byte(message))
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hash.Write(receiverPubKey)
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hash.Write(amountBytes)
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return hash.Sum(nil)
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}
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func getSignMsg(txHash []byte, createdAt time.Time) ([]byte, error) {
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buf := bytes.NewBuffer(txHash)
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timestamp := createdAt.Unix()
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if err := binary.Write(buf, binary.BigEndian, timestamp); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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func SingTransaction(key ed.PrivateKey, txHash []byte, signedAt time.Time) (sig []byte, err error) {
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msg, err := getSignMsg(txHash, signedAt)
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if err != nil {
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return nil, err
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}
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sig = ed.Sign(key, msg)
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return sig, nil
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}
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func VerifyTransactionSignature(key ed.PublicKey, signature []byte, txHash []byte, signedAt time.Time) (valid bool, err error) {
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msg, err := getSignMsg(txHash, signedAt)
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if err != nil {
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return false, err
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}
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return ed.Verify(key, msg, signature), nil
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}
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