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lockable.go
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lockable.go
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package lynx
import "sync"
// Lockable defines an interface for objects that can be locked and unlocked.
type Lockable interface {
LockableValues() []*string
}
// Lock takes a lockable and encrypts its fields with the supplied key. If no
// nonce is set, one will be set for it.
func Lock(key []byte, lockable Lockable) error {
fields := lockable.LockableValues()
wg := &sync.WaitGroup{}
for _, field := range fields {
// We accept nil values, but do not attempt to encrypt them.
if field == nil {
continue
}
wg.Add(1)
go lockField(wg, key, field)
}
wg.Wait()
return nil
}
// lockField is a goroutine safe way to encrypt a single field.
func lockField(wg *sync.WaitGroup, key []byte, plainText *string) {
nonce, err := NewNonce()
if err != nil {
panic(err)
}
// Encrypt the field
cypherText := Encrypt([]byte(*plainText), nonce, key)
// Replace the string at the pointer with the cypherText.
*plainText = nonce + ":" + string(cypherText)
wg.Done()
}
// Unlock takes a lockable and encrypts its fields with the supplied key.
func Unlock(key []byte, lockable Lockable) error {
fields := lockable.LockableValues()
return UnlockMany(key, fields)
}