75 lines
1.4 KiB
Go
75 lines
1.4 KiB
Go
package whisper
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import (
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"crypto/ecdsa"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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)
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type Message struct {
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Flags byte
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Signature []byte
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Payload []byte
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}
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func NewMessage(payload []byte) *Message {
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return &Message{Flags: 0, Payload: payload}
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}
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func (self *Message) hash() []byte {
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return crypto.Sha3(append([]byte{self.Flags}, self.Payload...))
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}
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func (self *Message) sign(key *ecdsa.PrivateKey) (err error) {
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self.Flags = 1
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self.Signature, err = crypto.Sign(self.hash(), key)
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return
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}
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func (self *Message) Recover() *ecdsa.PublicKey {
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defer func() { recover() }() // in case of invalid sig
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return crypto.SigToPub(self.hash(), self.Signature)
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}
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func (self *Message) Encrypt(to *ecdsa.PublicKey) (err error) {
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self.Payload, err = crypto.Encrypt(to, self.Payload)
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if err != nil {
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return err
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}
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return nil
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}
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func (self *Message) Bytes() []byte {
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return append([]byte{self.Flags}, append(self.Signature, self.Payload...)...)
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}
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type Opts struct {
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From *ecdsa.PrivateKey
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To *ecdsa.PublicKey
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Ttl time.Duration
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Topics [][]byte
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}
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func (self *Message) Seal(pow time.Duration, opts Opts) (*Envelope, error) {
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if opts.From != nil {
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err := self.sign(opts.From)
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if err != nil {
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return nil, err
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}
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}
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if opts.To != nil {
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err := self.Encrypt(opts.To)
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if err != nil {
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return nil, err
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}
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}
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envelope := NewEnvelope(DefaultTtl, opts.Topics, self)
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envelope.Seal(pow)
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return envelope, nil
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}
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