/
passphrase_stream_cache.go
185 lines (158 loc) · 3.48 KB
/
passphrase_stream_cache.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package libkb
import (
"fmt"
"sync"
)
type PassphraseStreamCache struct {
sync.Mutex
tsec *LockedTriplesec
passphraseStream *PassphraseStream
}
// LockedTriplesec is a wrapper around a Triplesec interface,
// which allows multiple goroutines to handle the same underlying
// Triplesec at the same time. The mechanism is simply a mutex
// wrapping all accesses.
type LockedTriplesec struct {
sync.Mutex
t Triplesec
}
func (t *LockedTriplesec) DeriveKey(l int) ([]byte, []byte, error) {
t.Lock()
defer t.Unlock()
return t.t.DeriveKey(l)
}
func (t *LockedTriplesec) Decrypt(b []byte) ([]byte, error) {
t.Lock()
defer t.Unlock()
return t.t.Decrypt(b)
}
func (t *LockedTriplesec) Encrypt(b []byte) ([]byte, error) {
t.Lock()
defer t.Unlock()
return t.t.Encrypt(b)
}
func (t *LockedTriplesec) Scrub() {
t.Lock()
defer t.Unlock()
t.t.Scrub()
}
func NewLockedTriplesec(t Triplesec) *LockedTriplesec {
if t == nil {
return nil
}
return &LockedTriplesec{t: t}
}
var _ Triplesec = (*LockedTriplesec)(nil)
func NewPassphraseStreamCache(tsec Triplesec, ps *PassphraseStream) *PassphraseStreamCache {
return &PassphraseStreamCache{
tsec: NewLockedTriplesec(tsec),
passphraseStream: ps,
}
}
func (s *PassphraseStreamCache) TriplesecAndGeneration() (Triplesec, PassphraseGeneration) {
var zed PassphraseGeneration
if s == nil {
return nil, zed
}
s.Lock()
defer s.Unlock()
// Beware the classic Go `nil` interface bug...
if s.tsec == nil {
return nil, zed
}
if s.passphraseStream == nil {
return nil, zed
}
ppgen := s.passphraseStream.Generation()
if ppgen.IsNil() {
return nil, zed
}
return s.tsec, ppgen
}
func (s *PassphraseStreamCache) PassphraseStreamAndTriplesec() (pps *PassphraseStream, tsec Triplesec) {
if s == nil {
return nil, nil
}
s.Lock()
defer s.Unlock()
// Beware the classic Go `nil` interface bug...
if s.tsec != nil {
tsec = s.tsec
}
if s.passphraseStream != nil {
pps = s.passphraseStream.Clone()
}
return pps, tsec
}
// PassphraseStream returns a copy of the currently cached passphrase stream,
// or nil if none exists.
func (s *PassphraseStreamCache) PassphraseStream() *PassphraseStream {
if s == nil {
return nil
}
s.Lock()
defer s.Unlock()
return s.passphraseStream.Clone()
}
func (s *PassphraseStreamCache) MutatePassphraseStream(f func(*PassphraseStream)) bool {
if s == nil {
return false
}
s.Lock()
defer s.Unlock()
if s.passphraseStream == nil {
return false
}
f(s.passphraseStream)
return true
}
func (s *PassphraseStreamCache) Valid() bool {
if s == nil {
return false
}
s.Lock()
defer s.Unlock()
return s.passphraseStream != nil && s.tsec != nil
}
func (s *PassphraseStreamCache) ValidPassphraseStream() bool {
if s == nil {
return false
}
s.Lock()
defer s.Unlock()
return s.passphraseStream != nil
}
func (s *PassphraseStreamCache) ValidTsec() bool {
if s == nil {
return false
}
s.Lock()
defer s.Unlock()
return s.tsec != nil
}
func (s *PassphraseStreamCache) Clear() {
if s == nil {
return
}
s.Lock()
defer s.Unlock()
if s.tsec != nil {
s.tsec.Scrub()
s.tsec = nil
}
s.passphraseStream = nil
}
func (s *PassphraseStreamCache) Dump() {
fmt.Printf("PassphraseStreamCache:\n")
if s == nil {
fmt.Printf("nil\n")
return
}
s.Lock()
defer s.Unlock()
fmt.Printf("PassphraseStreamCache:\n")
fmt.Printf("Valid: %v\n", s.Valid())
fmt.Printf("\n")
}