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package tpm2
import (
"bytes"
"encoding/binary"
"reflect"
)
// HandleName returns the TPM Name of a PCR, session, or permanent value
// (e.g., hierarchy) handle.
func HandleName(h TPMHandle) TPM2BName {
result := make([]byte, 4)
binary.BigEndian.PutUint32(result, uint32(h))
return TPM2BName{
Buffer: result,
}
}
// objectOrNVName calculates the Name of an NV index or object.
// pub is a pointer to either a TPMTPublic or TPMSNVPublic.
func objectOrNVName(alg TPMAlgID, pub interface{}) (*TPM2BName, error) {
h, err := alg.Hash()
if err != nil {
return nil, err
}
// Create a byte slice with the correct reserved size and marshal the
// NameAlg to it.
result := make([]byte, 2, 2+h.Size())
binary.BigEndian.PutUint16(result, uint16(alg))
// Calculate the hash of the entire Public contents and append it to the
// result.
ha := h.New()
var buf bytes.Buffer
if err := marshal(&buf, reflect.ValueOf(pub)); err != nil {
return nil, err
}
ha.Write(buf.Bytes())
result = ha.Sum(result)
return &TPM2BName{
Buffer: result,
}, nil
}
// ObjectName returns the TPM Name of an object.
func ObjectName(p *TPMTPublic) (*TPM2BName, error) {
return objectOrNVName(p.NameAlg, p)
}
// NVName returns the TPM Name of an NV index.
func NVName(p *TPMSNVPublic) (*TPM2BName, error) {
return objectOrNVName(p.NameAlg, p)
}
// PrimaryHandleName returns the TPM Name of a primary handle.
func PrimaryHandleName(h TPMHandle) []byte {
result := make([]byte, 4)
binary.BigEndian.PutUint32(result, uint32(h))
return result
}
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