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//go:build !windows
// Copyright (c) 2016, Kevin Walsh. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package main implements a program to clear key handles from a TPM.
package main
import (
"flag"
"fmt"
"os"
"github.com/google/go-tpm/tpm"
)
func main() {
var tpmname = flag.String("tpm", "/dev/tpm0", "The path to the TPM device to use")
var closekey = flag.Bool("close", false, "Close (unload) all existing key handles")
flag.Parse()
rwc, err := tpm.OpenTPM(*tpmname)
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't open the TPM file %s: %s\n", *tpmname, err)
return
}
handles, err := tpm.GetKeys(rwc)
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't enumerate loaded TPM keys: %s\n", err)
return
}
fmt.Printf("%d keys loaded in the TPM\n", len(handles))
for i, h := range handles {
fmt.Printf(" (%d) Key handle %d\n", i+1, h)
if *closekey {
if err = tpm.CloseKey(rwc, h); err != nil {
fmt.Fprintf(os.Stderr, "Couldn't close TPM key handle %d\n", h)
} else {
fmt.Printf(" Closed handle %d\n", h)
}
}
}
return
}
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