61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
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package model
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import (
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"crypto/rand"
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"fmt"
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"golang.org/x/crypto/nacl/secretbox"
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"io"
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)
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type Group struct {
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GroupID string
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GroupKey [32]byte
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GroupServer string
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Timeline []Message
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}
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func NewGroup(server string) *Group {
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group := new(Group)
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group.GroupServer = server
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var groupID [16]byte
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if _, err := io.ReadFull(rand.Reader, groupID[:]); err != nil {
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panic(err)
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}
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group.GroupID = fmt.Sprintf("%x", groupID)
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var groupKey [32]byte
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if _, err := io.ReadFull(rand.Reader, groupKey[:]); err != nil {
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panic(err)
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}
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copy(group.GroupKey[:], groupKey[:])
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return group
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}
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func (g *Group) AddMember() {
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// TODO: Rotate Key
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}
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func (g *Group) RemoveMember() {
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// TODO: Rotate Key
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}
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func (g *Group) EncryptMessage(message string) []byte {
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var nonce [24]byte
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if _, err := io.ReadFull(rand.Reader, nonce[:]); err != nil {
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panic(err)
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}
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encrypted := secretbox.Seal(nonce[:], []byte(message), &nonce, &g.GroupKey)
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return encrypted
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}
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func (g *Group) DecryptMessage(ciphertext []byte) (bool, string) {
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var decryptNonce [24]byte
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copy(decryptNonce[:], ciphertext[:24])
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decrypted, ok := secretbox.Open(nil, ciphertext[24:], &decryptNonce, &g.GroupKey)
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if ok {
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return true, string(decrypted)
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}
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return false, ""
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}
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