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>
42 lines
1.3 KiB
Go
42 lines
1.3 KiB
Go
package tpm2
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import (
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"io"
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)
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var (
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labelDuplicate = "DUPLICATE"
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)
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// CreateDuplicate encrypts an object so that it can be imported under a target Storage Key.
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// An inner wrapper is not supported.
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func CreateDuplicate(rand io.Reader, pub LabeledEncapsulationKey, name []byte, sensitive []byte) (duplicate []byte, encSecret []byte, err error) {
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secret, ciphertext, err := pub.Encapsulate(rand, labelDuplicate)
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if err != nil {
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return nil, nil, err
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}
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// Marshal the sensitive as a TPM2B_SENSITIVE before encrypting it.
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// See Part 1, "Outer Duplication Wrapper"
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sensitive2B := Marshal(TPM2BDigest{Buffer: sensitive})
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// Encrypt the sensitive2B as dupSensitive.
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dupSensitive, err := deriveAndEncrypt(pub, secret, name, sensitive2B)
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if err != nil {
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return nil, nil, err
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}
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// Compute the HMAC of (dupSensitive || name)
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outerHMAC, err := deriveAndHMAC(pub, secret, nil, dupSensitive, name)
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if err != nil {
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return nil, nil, err
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}
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// Marshal the virtual _PRIVATE ourselves. We have to do this since dupSensitive's size is encrypted.
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duplicate = make([]byte, 0, 2+len(outerHMAC)+len(dupSensitive))
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duplicate = append(duplicate, Marshal(TPM2BDigest{Buffer: outerHMAC})...)
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duplicate = append(duplicate, dupSensitive...)
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return duplicate, ciphertext, nil
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}
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