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// Copyright 2015 CoreOS, Inc.
//
// 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 tspi
// #include <trousers/tss.h>
import "C"
import "unsafe"
// PCRs is a structure representing a PCR object and the PCR values
type PCRs struct {
handle C.TSS_HPCRS
context C.TSS_HCONTEXT
pcrs [24][]byte
pcrset [24]bool
}
// SetPCRs takes an array of integers referring to PCRs. Any queries performed
// with this PCR object will then query these PCRs.
func (pcrs *PCRs) SetPCRs(pcrset []int) error {
for pcr := range pcrs.pcrset {
pcrs.pcrset[pcr] = false
}
for _, pcr := range pcrset {
err := tspiError(C.Tspi_PcrComposite_SelectPcrIndex(pcrs.handle, (C.UINT32)(pcr)))
if err != nil {
return err
}
pcrs.pcrset[pcr] = true
}
return nil
}
// GetPCRValues obtains the PCR values for any PCRs that have been set.
func (pcrs *PCRs) GetPCRValues() ([][]byte, error) {
var buflen C.UINT32
var buf *C.BYTE
for pcr := range pcrs.pcrs {
if pcrs.pcrset[pcr] == false {
continue
}
err := tspiError(C.Tspi_PcrComposite_GetPcrValue(pcrs.handle, (C.UINT32)(pcr), &buflen, &buf))
if err != nil {
return nil, err
}
pcrs.pcrs[pcr] = C.GoBytes(unsafe.Pointer(buf), (C.int)(buflen))
C.Tspi_Context_FreeMemory(pcrs.context, buf)
}
return pcrs.pcrs[:], nil
}
// Close closes the PCRs object.
func (pcrs *PCRs) Close() error {
err := tspiError(C.Tspi_Context_CloseObject(pcrs.context, pcrs.handle))
return err
}
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