constellation/internal/attestation/vtpm/vtpm.go

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/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package vtpm
import (
"io"
"github.com/google/go-tpm/tpm2"
)
const (
// tpmPath is the path to the vTPM.
tpmPath = "/dev/tpmrm0"
)
// TPMOpenFunc opens a TPM device.
type TPMOpenFunc func() (io.ReadWriteCloser, error)
// OpenVTPM opens the vTPM at `TPMPath`.
func OpenVTPM() (io.ReadWriteCloser, error) {
return tpm2.OpenTPM(tpmPath)
}
type nopTPM struct{}
// OpenNOPTPM returns a NOP io.ReadWriteCloser that can be used as a TPM.
func OpenNOPTPM() (io.ReadWriteCloser, error) {
return &nopTPM{}, nil
}
func (t nopTPM) Read(p []byte) (int, error) {
return len(p), nil
}
func (t nopTPM) Write(p []byte) (int, error) {
return len(p), nil
}
func (t nopTPM) Close() error {
return nil
}