mirror of
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96 lines
2.9 KiB
Go
96 lines
2.9 KiB
Go
// Package keyhelper is based on: https://github.com/WhisperSystems/libsignal-protocol-java/blob/master/java/src/main/java/org/whispersystems/libsignal/util/KeyHelper.java
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package keyhelper
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import (
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"crypto/rand"
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"encoding/binary"
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"time"
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"go.mau.fi/libsignal/ecc"
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"go.mau.fi/libsignal/keys/identity"
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"go.mau.fi/libsignal/state/record"
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)
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// GenerateIdentityKeyPair generates an identity keypair used for
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// signing. Clients should only do this once at install time.
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func GenerateIdentityKeyPair() (*identity.KeyPair, error) {
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keyPair, err := ecc.GenerateKeyPair()
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if err != nil {
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return nil, err
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}
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publicKey := identity.NewKey(keyPair.PublicKey())
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return identity.NewKeyPair(publicKey, keyPair.PrivateKey()), nil
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}
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// GeneratePreKeys generates a list of PreKeys. Client shsould do this at
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// install time, and subsequently any time the list of PreKeys stored on
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// the server runs low.
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//
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// PreKeys IDs are shorts, so they will eventually be repeated. Clients
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// should store PreKeys in a circular buffer, so that they are repeated
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// as infrequently as possible.
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func GeneratePreKeys(start int, count int, serializer record.PreKeySerializer) ([]*record.PreKey, error) {
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var preKeys []*record.PreKey
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for i := start; i <= count; i++ {
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key, err := ecc.GenerateKeyPair()
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if err != nil {
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return nil, err
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}
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preKeys = append(preKeys, record.NewPreKey(uint32(i), key, serializer))
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}
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return preKeys, nil
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}
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// GenerateLastResortKey will generate the last resort PreKey. Clients should
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// do this only once, at install time, and durably store it for the length
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// of the install.
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func GenerateLastResortKey(serializer record.PreKeySerializer) (*record.PreKey, error) {
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keyPair, err := ecc.GenerateKeyPair()
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if err != nil {
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return nil, err
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}
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return record.NewPreKey(0, keyPair, serializer), nil
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}
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// GenerateSignedPreKey generates a signed PreKey.
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func GenerateSignedPreKey(identityKeyPair *identity.KeyPair, signedPreKeyID uint32, serializer record.SignedPreKeySerializer) (*record.SignedPreKey, error) {
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keyPair, err := ecc.GenerateKeyPair()
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if err != nil {
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return nil, err
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}
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signature := ecc.CalculateSignature(identityKeyPair.PrivateKey(), keyPair.PublicKey().Serialize())
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timestamp := time.Now().Unix()
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return record.NewSignedPreKey(signedPreKeyID, timestamp, keyPair, signature, serializer), nil
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}
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// GenerateRegistrationID generates a registration ID. Clients should only do
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// this once, at install time.
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func GenerateRegistrationID() uint32 {
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var n uint32
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binary.Read(rand.Reader, binary.LittleEndian, &n)
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return n
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}
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//---------- Group Stuff ----------------
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func GenerateSenderSigningKey() (*ecc.ECKeyPair, error) {
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return ecc.GenerateKeyPair()
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}
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func GenerateSenderKey() []byte {
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randBytes := make([]byte, 32)
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rand.Read(randBytes)
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return randBytes
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}
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func GenerateSenderKeyID() uint32 {
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return GenerateRegistrationID()
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}
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//---------- End Group Stuff --------------
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