59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
// SPDX-FileCopyrightText: 2021 The NGI Pointer Secure-Scuttlebutt Team of 2020/2021
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//
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// SPDX-License-Identifier: MIT
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// Package aliases implements the validation and signing features of https://ssbc.github.io/rooms2/#alias
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package aliases
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import (
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"bytes"
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"golang.org/x/crypto/ed25519"
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refs "github.com/ssbc/go-ssb-refs"
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)
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// Registration ties an alias to the ID of the user and the RoomID it should be registered on
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type Registration struct {
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Alias string
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UserID refs.FeedRef
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RoomID refs.FeedRef
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}
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// Sign takes the public key (belonging to UserID) and returns the signed confirmation
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func (r Registration) Sign(privKey ed25519.PrivateKey) Confirmation {
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var conf Confirmation
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conf.Registration = r
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msg := r.createRegistrationMessage()
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conf.Signature = ed25519.Sign(privKey, msg)
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return conf
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}
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// createRegistrationMessage returns the string of bytes that should be signed
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func (r Registration) createRegistrationMessage() []byte {
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var message bytes.Buffer
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message.WriteString("=room-alias-registration:")
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message.WriteString(r.RoomID.String())
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message.WriteString(":")
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message.WriteString(r.UserID.String())
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message.WriteString(":")
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message.WriteString(r.Alias)
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return message.Bytes()
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}
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// Confirmation combines a registration with the corresponding signature
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type Confirmation struct {
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Registration
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Signature []byte
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}
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// Verify checks that the confirmation is for the expected room and from the expected feed
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func (c Confirmation) Verify() bool {
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// re-construct the registration
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message := c.createRegistrationMessage()
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// check the signature matches
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return ed25519.Verify(c.UserID.PubKey(), message, c.Signature)
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}
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