/
aeskey.go
49 lines (40 loc) · 1.14 KB
/
aeskey.go
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package sw
import (
"crypto/sha256"
"errors"
"github.com/hello2mao/go-common/stable/csp"
)
type aesPrivateKey struct {
privKey []byte
exportable bool
}
// Bytes converts this key to its byte representation,
// if this operation is allowed.
func (k *aesPrivateKey) Bytes() (raw []byte, err error) {
if k.exportable {
return k.privKey, nil
}
return nil, errors.New("Not supported.")
}
// SKI returns the subject key identifier of this key.
func (k *aesPrivateKey) SKI() (ski []byte) {
hash := sha256.New()
hash.Write([]byte{0x01})
hash.Write(k.privKey)
return hash.Sum(nil)
}
// Symmetric returns true if this key is a symmetric key,
// false if this key is asymmetric
func (k *aesPrivateKey) Symmetric() bool {
return true
}
// Private returns true if this key is a private key,
// false otherwise.
func (k *aesPrivateKey) Private() bool {
return true
}
// PublicKey returns the corresponding public key part of an asymmetric public/private key pair.
// This method returns an error in symmetric key schemes.
func (k *aesPrivateKey) PublicKey() (csp.Key, error) {
return nil, errors.New("Cannot call this method on a symmetric key.")
}