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ppi.go
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ppi.go
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// Copyright 2023 Canonical Ltd.
// Licensed under the LGPLv3 with static-linking exception.
// See LICENCE file for details.
package ppi
import (
"errors"
"sync"
"github.com/canonical/go-tpm2"
"github.com/canonical/go-tpm2/ppi"
)
type PPIBackend interface {
SubmitOperation(op ppi.OperationId, arg *uint64) error
StateTransitionAction() (ppi.StateTransitionAction, error)
OperationStatus(op ppi.OperationId) (ppi.OperationStatus, error)
OperationResponse() (*ppi.OperationResponse, error)
}
type PPI struct {
version ppi.Version
functions PPIBackend
staOnce sync.Once
sta ppi.StateTransitionAction
staError error
ops map[ppi.OperationId]ppi.OperationStatus
rspOnce sync.Once
rsp *ppi.OperationResponse
rspError error
}
func New(version ppi.Version, functions PPIBackend) *PPI {
return &PPI{
version: version,
functions: functions,
ops: make(map[ppi.OperationId]ppi.OperationStatus),
}
}
func (p *PPI) submitOperation(op ppi.OperationId) error {
return p.functions.SubmitOperation(op, nil)
}
func (p *PPI) Version() ppi.Version {
return p.version
}
func (p *PPI) StateTransitionAction() (ppi.StateTransitionAction, error) {
p.staOnce.Do(func() {
p.sta, p.staError = p.functions.StateTransitionAction()
})
return p.sta, p.staError
}
func (p *PPI) OperationStatus(op ppi.OperationId) (ppi.OperationStatus, error) {
status, exists := p.ops[op]
if exists {
return status, nil
}
status, err := p.functions.OperationStatus(op)
if err != nil {
return 0, err
}
p.ops[op] = status
return status, nil
}
func (p *PPI) EnableTPM() error {
return p.submitOperation(ppi.OperationEnableTPM)
}
func (p *PPI) DisableTPM() error {
return p.submitOperation(ppi.OperationDisableTPM)
}
func (p *PPI) ClearTPM() error {
return p.submitOperation(ppi.OperationClearTPM)
}
func (p *PPI) EnableAndClearTPM() error {
return p.submitOperation(ppi.OperationEnableAndClearTPM)
}
func (p *PPI) SetPCRBanks(algs ...tpm2.HashAlgorithmId) error {
bits := ppi.MakeHashAlgorithms(algs...)
return p.functions.SubmitOperation(ppi.OperationSetPCRBanks, (*uint64)(&bits))
}
func (p *PPI) ChangeEPS() error {
return p.submitOperation(ppi.OperationChangeEPS)
}
func (p *PPI) SetPPRequiredForOperation(op ppi.OperationId) error {
op = op.SetPPRequiredOperationId()
if op == ppi.NoOperation {
return errors.New("invalid operation")
}
return p.submitOperation(op)
}
func (p *PPI) ClearPPRequiredForOperation(op ppi.OperationId) error {
op = op.ClearPPRequiredOperationId()
if op == ppi.NoOperation {
return errors.New("invalid operation")
}
return p.submitOperation(op)
}
func (p *PPI) OperationResponse() (*ppi.OperationResponse, error) {
p.rspOnce.Do(func() {
p.rsp, p.rspError = p.functions.OperationResponse()
})
return p.rsp, p.rspError
}