Kyle Isom
115f23a3ea
Vendor dependencies and expose control program binaries via nix build. Uses nixpkgs-unstable for Go 1.26 support. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
package tpm2
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import (
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"bytes"
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"encoding/binary"
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"reflect"
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)
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// HandleName returns the TPM Name of a PCR, session, or permanent value
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// (e.g., hierarchy) handle.
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func HandleName(h TPMHandle) TPM2BName {
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result := make([]byte, 4)
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binary.BigEndian.PutUint32(result, uint32(h))
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return TPM2BName{
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Buffer: result,
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}
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}
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// objectOrNVName calculates the Name of an NV index or object.
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// pub is a pointer to either a TPMTPublic or TPMSNVPublic.
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func objectOrNVName(alg TPMAlgID, pub interface{}) (*TPM2BName, error) {
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h, err := alg.Hash()
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if err != nil {
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return nil, err
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}
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// Create a byte slice with the correct reserved size and marshal the
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// NameAlg to it.
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result := make([]byte, 2, 2+h.Size())
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binary.BigEndian.PutUint16(result, uint16(alg))
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// Calculate the hash of the entire Public contents and append it to the
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// result.
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ha := h.New()
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var buf bytes.Buffer
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if err := marshal(&buf, reflect.ValueOf(pub)); err != nil {
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return nil, err
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}
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ha.Write(buf.Bytes())
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result = ha.Sum(result)
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return &TPM2BName{
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Buffer: result,
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}, nil
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}
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// ObjectName returns the TPM Name of an object.
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func ObjectName(p *TPMTPublic) (*TPM2BName, error) {
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return objectOrNVName(p.NameAlg, p)
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}
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// NVName returns the TPM Name of an NV index.
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func NVName(p *TPMSNVPublic) (*TPM2BName, error) {
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return objectOrNVName(p.NameAlg, p)
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}
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// PrimaryHandleName returns the TPM Name of a primary handle.
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func PrimaryHandleName(h TPMHandle) []byte {
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result := make([]byte, 4)
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binary.BigEndian.PutUint32(result, uint32(h))
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return result
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}
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