Function PublicKey

internal/sshutil/sshutil.go:48–66

PublicKey returns the Go's crypto.PublicKey of an ssh.PublicKey.

(key ssh.PublicKey)

// PublicKey returns the Go's crypto.PublicKey of an ssh.PublicKey.
func PublicKey(key ssh.PublicKey) (crypto.PublicKey, error) {
	_, in, ok := parseString(key.Marshal())
	if !ok {
		return nil, errors.New("public key is invalid")
	}

	switch key.Type() {
	case ssh.KeyAlgoRSA:
		return parseRSA(in)
	case ssh.KeyAlgoECDSA256, ssh.KeyAlgoECDSA384, ssh.KeyAlgoECDSA521, ssh.KeyAlgoSKECDSA256:
		return parseECDSA(in)
	case ssh.KeyAlgoED25519, ssh.KeyAlgoSKED25519:
		return parseED25519(in)
	case ssh.InsecureKeyAlgoDSA: //nolint:staticcheck // compatibility with older tooling
		return parseDSA(in)
	default:
		return nil, errors.Errorf("public key %s is not supported", key.Type())
	}
}

func publicKeyTypeAndSize(key ssh.PublicKey) (string, int, error) {
	var isCert bool