// Description returns the key's description as a string.
func (mk *MetaKey) Description() (d string, err error) {
tlv, err := mk.fields.Get(tagDescription)
if tlv != nil {
d = string(tlv.Value())
}
return
}
// Expires returns the expiration date as an ANSIC-formatted string.
func (mk *MetaKey) Expires() (e string, err error) {
tlv, err := mk.fields.Get(tagExpiration)
if tlv != nil {
e = string(tlv.Value())
}
return
}
// GetKey returns the appropriate encryption key for the requested algorithm.
func (mk *MetaKey) GetKey(keySize int) (key []byte, err error) {
var keyType int
switch keySize {
case AES128KeyLength:
keyType = tagKeyAES128
case AES192KeyLength:
keyType = tagKeyAES192
case AES256KeyLength:
keyType = tagKeyAES256
default:
return key, ErrKeySizeNotSupported
}
tlv, err := mk.fields.Get(keyType)
if err != nil {
return
}
key = tlv.Value()
return
}